Modine Manufacturing 6 558 Users Manual Psh Service

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6-558.6
P/N 5H72256A Rev. F
October, 2002

INSTALLATION AND SERVICE MANUAL
separated combustion
high efficiency
gas-fired unit heaters
models PSH & BSH

All models approved for use in California by the CEC (when
equipped with IPI), in New York by the MEA division, and in
Massachusetts. Unit heater is certified for non-residential
applications.

Contents

WARNING
Improper installation, adjustment, alteration, service or

Page

Inspection on arrival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Performance data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Checking input rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Propeller heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Service instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Troubleshooting guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Motor data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Control options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Rating plate identification . . . . . . . . . . . . . . . . . . . . . . . . . 27
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back cover

maintenance can cause property damage, injury or death,
and could cause exposure to substances which have been
determined by various state agencies to cause cancer, birth
defects or other reproductive harm. Read the installation,
operating and maintenance instructions thoroughly before
installing or servicing this equipment.

FOR YOUR SAFETY
The use and storage of gasoline or other flammable vapors
and liquids in open containers in the vicinity of this appliance
is hazardous.

CAUTION

FOR YOUR SAFETY
If you smell gas:
1. Open windows
2. Don't touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN
YOU LEAVE THE JOB.

Inspection on Arrival
1.

To prevent premature heat exchanger failure do not locate
ANY gas-fired units in areas where chlorinated, halogenated

2.

or acid vapors are present in the atmosphere.

3.

Inspect unit upon arrival. In case of damage, report
immediately to transportation company and your local
Modine sales representative.
Check rating plate on unit to verify that power supply meets
available electric power at the point of installation.
Inspect unit received for conformance with description of
product ordered (including specifications where applicable).

Heater Parts from ACF Greenhouses

INSTALLATION
SPECIAL PRECAUTIONS
THE INSTALLATION AND MAINTENANCE INSTRUCTIONS
IN THIS MANUAL MUST BE FOLLOWED TO PROVIDE
SAFE, EFFICIENT AND TROUBLE-FREE OPERATION. IN
ADDITION, PARTICULAR CARE MUST BE EXERCISED
REGARDING THE SPECIAL PRECAUTIONS LISTED
BELOW. FAILURE TO PROPERLY ADDRESS THESE
CRITICAL AREAS COULD RESULT IN PROPERTY
DAMAGE OR LOSS, PERSONAL INJURY, OR DEATH.
1. Disconnect power supply before making wiring
connections to prevent electrical shock and equipment
damage. All units must be wired strictly in accordance
with wiring diagram furnished with the unit.
2. Turn off all gas before installing unit heaters.
3. Gas pressure to unit heater controls must never exceed
14" W.C. (1/2 psi).
When leak testing the gas supply piping system, the unit
and its combination gas control must be isolated during
any pressure testing in excess of 14" W.C. (1/2 psi).
The unit should be isolated from the gas supply piping
system by closing its field installed manual shut-off valve.
4. Check gas inlet pressure at unit upstream from
combination gas control. The inlet pressure should be 6" 7" W.C. on natural gas or 11" - 14" W.C. on propane gas.
Purging of gas piping should be performed as described
in ANSI Z223.1 - Latest Edition or in Canada in
CAN/CGA-B149 codes.
5. All units must be supplied with both combustion air and
exhaust piping to the outdoors.
6. Do not install in potentially explosive or flammable
atmospheres laden with grain dust, sawdust, or similar airborne materials. In such applications, a blower type heater
installed in a separate room with ducting, including
appropriate back flow prevention dampers to the dustladen room, is recommended.
7. Installation of units in high humidity or salt water
atmospheres will cause accelerated corrosion resulting in
a reduction of the normal life span of the units.
8. To prevent premature failure do not located ANY gas-fired
unit heaters in areas where chlorinated, halogenated or
acid vapors are present in the atmosphere.
9. Maintain separation between units so discharge from one
unit will not be directed into the inlet of another.
10. Do not install unit outdoors.
11. Minimum clearance to combustibles is 12 inches from the
bottom; 18 inches from the sides; 6 inches from the top
and vent connector.
12. Allow at least 6" clearance at the sides and 12" clearance
at rear (or 6" beyond end of fan motor at rear of unit,
whichever is greater) to provide ample air for combustion
and proper operation of fan.

expected to fall outside of the is range, contact factory
for recommendations.
16. Provide clearance for opening hinged bottom pan for
servicing. See Figure 2. Do not set unit on its bottom.
17. To assure that flames do not impinge on heat exchanger
surfaces, the unit must be suspended in a vertical and
level position. Failure to suspend unit properly may
shorten the life of the unit heater.
18. Do not life unit by power exhauster.
19. Be sure no obstructions block air intake and discharge of
unit.
20. Do not attach duct work, air filters, or polytubes to any
propeller (PSH) model unit.
21. In aircraft hangars, keep the bottom of the unit at least
10' from the highest surface of the wings or engine
enclosure of the highest aircraft housed in the hanger
and in accordance with the requirements of the enforcing
authority and/or NFPA No. 409 — Latest Edition.
22. In garages or other sections of aircraft hangars such as
offices and shops that communicate with areas used for
servicing or storage, keep the bottom of the unit at least
7' above the floor unless the unit is properly guarded to
provide user protection from moving parts. In parking
garages, the unit must be installed in accordance with
the standard for parking structures ANSI/NFPA 88A, and
in repair garages the standard for repair garages NFPA
#88B. In Canada, installation of unit heaters in airplane
hangars must be in accordance with the requirements of
the enforcing authority, and in public garages in
accordance with the current CAN/CGA-B149 codes.
23. Consult piping, electrical, and venting instructions in this
manual before final installation.
24. All literature shipped with your unit should be kept for
future use for servicing or service diagnosis. Do not
discard any literature shipped with your unit.
25. When servicing or repairing this equipment, use only
Modine-approved service replacement parts. A complete
replacement parts list may be obtained by contacting
Modine Manufacturing Company. Refer to the rating
plate on the unit for complete unit model number,
serial number and company address. Any substitution
of parts or controls not approved by Modine will be at
owners risk.

Figure 2
Hinged Bottom for Burner Service
(See Dimension “C”, page 19)

13. The minimum distance from combustible material is based
on the combustible material surface not exceeding 160°F.
Clearance from the top of the unit may be required to be
greater than 6" if heat damage, or other than fire, may
occur to materials above the unit heater at the
temperature described.
14. Do not install units below 7 feet, measured from the
bottom of the unit to the floor, unless properly guarded to
provide protection from moving parts.
15. Modine units are designed for use in heating applications
with ambient temperatures between 32°F and 90°F. If an
application exists where ambient temperatures can be
2

Heater Parts from ACF Greenhouses

INSTALLATION
Product Description

Combustion Air Requirements

Modine PSH and BSH model unit heaters are listed as separated
combustion unit heaters and are defined as follows: A unit heater
for installation in non-residential structures which, when connected
to a sealed combustion air pipe and sealed exhaust vent, supplied
by the installer, constructed so that when installed according to the
manufacturer’s instructions, air for combustion is derived from the
outside atmosphere and the flue gases from the appliance are
discharged to the outside atmosphere and the flue gases from the
appliance are discharged to the outside atmosphere.

Modine models PSH and BSH separated combustion units are
designed to receive air for combustion directly from the outside
atmosphere via field installed combustion air piping between the
unit and the outside atmosphere. The combustion air inlet of the
unit must be connected to the outside atmosphere.

In the U.S., the installation of these units must comply with the
“National Fuel Gas Code,” ANSIZ223.1, latest edition (also known
as NFPA 54) and other applicable local building codes.
In Canada, the installation of these units must comply with local
plumbing or waste water codes and other applicable codes and
with the current code CAN/CGA-B149.1, “Installation Code for
Natural Gas Burning Appliances and Equipment” or CAN/CGAB149.2, “Installation Code for Propane Burning Appliances and
Equipment.”
1. All installation and service of these units must be performed by
a qualified installation and service agency only as defined in
ANSIZ223.1, latest edition or in Canada by a licensed gas fitter.
2. This unit is certified by C.S.A., with the controls furnished. For
replacement parts, submit the complete model, control code
and serial number shown on rating plate on the unit, Modine
reserves the right to substitute other authorized controls as
replacements.
3. Unit is balanced for correct performance. Do not alter fan or
operate motors at reduced speed.
4. Information on controls is supplied separately.
5. Modine unit heaters use the same burner for natural and
propane gases.

Locating Unit Heaters

CAUTION
Units must not be installed in potentially explosive, flammable or
corrosive atmosphere.
To prevent premature heat exchanger failure do not locate ANY
gas-fired unit in areas where chlorinated, halogenated or acid
vapors are present in the atmosphere.
In locating units, consider general space-heating requirements,
availability of gas, and proximity to vent locations. Unit heaters
should be located so heated air streams wipe exposed walls
without blowing directly against them. In multiple unit installations,
arrange units so that each supports the sir stream from another,
setting up circulatory air movement in the area. In buildings
exposed to prevailing winds, a large portion of the heated air
should be directed along with windward wall. Avoid interference of
air streams as much as possible.
Mounting height (measured from bottom of unit) at which unit
heaters are installed is critical. Maximum mounting heights for
standard units are listed in Tables 7 and 8 on page 18. Alternate
mounting heights for units with deflector hoods or nozzles are
shown on pages 10 and 12. The maximum mounting heights for
any unit is that heights above which the unit will not deliver heated
air to the floor. The maximum mounting heights must not be
exceeded in order to assure maximum comfort.
Motors and controls used on Modine unit heaters are designed for
use in ambient temperatures between 32°F and 90°F. If an
application exists where ambient temperatures can be expected to
fall outside of this range, contact factory for recommendations.

The maximum equivalent length of combustion air piping cannot
exceed 30 feet. Keep this limitation in mind when locating units.
See page 5 for combustion air piping instructions.

Unit Suspension

CAUTION
Minimum clearance to combustibles is 12 inches from the
bottom; 18 inches from the sides; 6 inches from the top and vent
connector.
Allow at least 12" at the rear of unit or 6" beyond the end of the
motor (Whichever is greater) to provide ample air for proper
operation of fan.
Provide clearance for opening hinged bottom of servicing. See
Figure 2.
Be sure the means of suspension is adequate to support the
weight of the unit. (See page 19 for unit weights.) For proper
operation, the unit must be installed in a level horizontal position.
Clearances to combustibles as specified above must be strictly
maintained.
On all propeller units except the PSH280 and PSH340, two tapped
holes (3/8 - 16) are located in the top of the unit to receive ceiling
hangers. Units with two point suspension, models PSH130 through
PSH225, incorporate a level hanging feature. Depending on what
options and accessories are being used, the heater may not hang
level as received from the factory. Do not hang heaters with
deflector hoods until referring to the "installation manual for
deflector hoods" and making the recommended preliminary
adjustments on the heater. These preliminary adjustments need to
be made with the heater resting on the floor.
PSH130 through PSH225 units without deflector hoods that do not
hang level after being installed, can be corrected in place. Simply
remove both outer side panels (screws to remove are on back
flange of side panel) and you will see the (adjustable) mounting
brackets (Figure 3). Loosen the set screws holding the mounting
brackets in place and using a rubber mallet or something similar,
tap the heater into a position where it does hang level. Re-tighten
set screws and replace the outer side panels.
The PSH280 and PSH340 have four mounting holes. On all blower
units, except the BSH280 and BSH340, two tapped holes are
provided in the top of the unit and two holes in the blower support
bracket. The BSH280 and BSH340 have four tapped holes in the
top of the unit and two in the blower support bracket for mounting.
To assure that flames are directed into the center of heat
exchanger tubes, unit must be supported in a vertical position, with
suspension hangers “UP.” Check with a level. This is important to
the operation and life of unit.
NOTE: Pipe hanger adapter kits, as shown in Figure 3, are
available as accessories from Modine. The hardware allows for
pipe caps to be secured into the top of the unit heater with
machine screws (as illustrated - machine screws are 3/8 - 16 x
1.75 UNC-2A THD). The pipe caps can then accommodate 3/4"
NPT pipe for mounting. Three different kits are available with either
2, 4, or 6 adapters per kit. See price sheet to determine proper kit.

3

Heater Parts from ACF Greenhouses

INSTALLATION
Figure 2
Suspension Methods

4. Install the vent and combustion air pipes with a downward
slope from the appliance of 1/4 inch per foot and suspend
securely from overhead structures at points no greater than
3 feet apart. Fasten individual lengths of vent together with
at least three corrosion resistant sheet metal screws.
5. Keep the vent pipe at least 6 inches from combustible
material. The minimum distance from combustible material
is based on the combustible material surface not exceeding
160F. Clearance from the vent pipe (or the top of the unit)
may be required to be greater than 6 inches if heat damage
other than fire (such as material distortion or discoloration)
could result.

Remove Side Panels
to Adjust Mounting Brackets

(Suspension w/ Pipe Adapter Kit)

Venting
General Venting and Combustion Air
Instructions

CAUTION
Gas-fired heating equipment must be vented — do not operated
unvented.
A built-in power exhauster is provided — additional external
draft hoods (diverters) or power exhausters are not required or
permitted.
Installation must conform with local building codes or in the
absence of local codes, with the National Fuel Gas Code, ANSI
Z223.1 (NFPA 54) — Latest Edition. In Canada installation must
be in accordance with CAN/CGA-B149.1 for natural gas
appliances, and CAN/CGA-B149.2 for propane appliances.
Table 1
ANSI venting requirements
Appliance
Category

Description

Venting
Requirements

6. Avoid venting through unheated space when possible.
When venting does pass through an unheated space,
insulate runs greater than 5 feet to minimize condensation.
Inspect for leakage prior to insulating and use insulation
that is noncombustible with a rating of not less than 350F.
Install a tee fitting at the low point of the vent system and
provide a drip let with a clean out cap as shown in figure
01. The drip leg should be cleaned annually.
7. When the vent passes through an INTERIOR wall or floor, a
metal thimble 4 inches greater than the vent diameter is
necessary. If there is 6 feet or more of vent pipe in the
open space between the unit heater and where the vent
pipe passes through the wall or floor, the thimble need only
be 2 inches greater than the diameter of the vent pipe. If a
thimble is not used, all combustible material must be cut
away to provide a 6 inches clearance. Any material used to
close the opening must be noncombustible.
8. Limit the total equivalent vent pipe length to a minimum of 5
feet and a maximum of 30 feet, making the vent system as
straight as possible. (The equivalent length of a 4 inch
elbow is 5 feet and a 6 inch elbow is 10 feet).
9. Seal the joints with a metallic tape suitable for temperatures
up to 350F. (3M tapes 433 or 363 are acceptable.) Wrap
the tape two full turns around the vent pipe.
10. Do NOT vent this appliance into a masonry chimney.

I

Negative vent pressure
Non-condensing

Follow standard venting
requirements.

II

Negative vent pressure
Condensing

Condensate must be
drained.

III

Positive vent pressure
Non-condensing

Vent must be gastight.

12. The venting system must be exclusive to a single appliance,
and to other appliance is allowed to be vented into it.

IV

Positive vent pressure
Condensing

Vent must be liquid and
gastight.
Condensate must be
drained.

13. Long runs of horizontal or vertical combustion air pipes may
require insulation in very cold climates to prevent the
buildup of condensation on the outside of the pipe where
the pipe passes through conditioned spaces.

1. Table 1 summarizes the ANSI venting requirements for the
various appliance categories. All PSH/BSH models are
category III appliances. The venting requirements for a
category III appliance are included in these instructions.
2. Select the size of vent and combustion air pipe that fits the
power exhauster and combustion air intake on the rear of
the appliance (see pages 14 and 15 for dimensions). Do
not use a vent or combustion air pipe smaller than the size
of the outlet or inlet on the appliance. The pipe should be
single wall galvanized steel or other suitable corrosion
resistant material. Follow the National Fuel Gas Code for
minimum thickness of vent material. The minimum
thickness for connectors varies depending on the pipe
diameter.
3. A minimum of 12 inches straight pipe is recommended from
the power exhauster outlet before turns in the vent pipe.

11. Do NOT use dampers or other devices in the vent or
combustion air pipes.

14. Vertical combustion air pipes should be fitted with a tee with
a drip leg and a clean out cap to prevent against the
possibility of any moister in the combustion air pipe from
entering the unit. The drip leg should be inspected and
cleaned periodically during the heating season.
15. When condensation may be a problem, the vent system
shall not terminate over public walkways or over an area
where condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of regulator,
relief openings or other equipment.
16. Precautions must be taken to prevent degradation of
building materials by flue products.
17. The vent cap for vertically vented appliances should extend
above any portion of a building within a horizontal distance
of 2 feet. Refer to figures 7 and 8.

4

Heater Parts from ACF Greenhouses

INSTALLATION
Venting Instructions for Concentric Vent
Options
The concentric vent concept allows for the vent pipe and the
combustion air pipe to pass through one hole in an
EXTERIOR wall or roof. The concentric vent kits offered are
horizontal or vertical. Venting with 2 pipes; a combustion air
pipe and flue product vent pipe remains an option, primarily
for replacement heaters where two holes through the exterior
of a building already exist.
When utilizing the concentric vent option, you have already
pre-determined whether the unit heater will be horizontal vent
or vertical vent and have received the appropriate kit. At this
time, you need to verify that you have all the components
required for the venting option chosen. The components for
each kit are as follows:
Horizontal Concentric Vent Kit:
• concentric adapter assembly
• specially designed vent termination cap
• specially designed inlet air guard
Vertical Concentric Vent Kit:
• concentric adapter assembly
• standard Briedert Type L or Gary Steel 1092 vent
termination cap
• specially designed inlet terminal
Although the first installation you will make will be the
concentric adapter assembly, you should now “read ahead”
the instructions for the type of venting option you’ve already
chosen - i.e. horizontal concentric, vertical concentric, 2 pipe
horizontal or 2 pipe vertical. These instructions can be found
on pages 5, 6,or 7 of these installation instructions. After
reading your specific instructions, come back to “Installing the
Concentric Vent Adapter Box” section and begin.

Figure 3
Adapter Box Assembly with Typical Field Supplied Mounting
Brackets

C

B
A

4. Determine the appropriate length of vent pipe that must be
attached to the vent outlet (the concentric side) of the box.
Refer to the following sections for the minimum length of
vent pipe to be used for the method of venting (vertical or
horizontal). Make sure to add the length of the field
supplied brackets if used, and the thickness of the wall or
roof.
5. Cut the vent pipe to the proper length and attach it to the
vent outlet of the concentric vent adapter box using at
least 3 corrosion resistant sheet metal screws. Seal this
joint using metallic tape suitable for temperatures up to
350° F. Wrap the tape two full turns around the vent pipe.
See figure 4.
Figure 4
Adapter Box Assembly with Vent Outlet Pipe Attached

Installing the Concentric Vent Adapter Box

CAUTION
The concentric vent adapter box must be installed inside of
the structure or building. Do not install this box on the
exterior of a building or structure.
1. Determine the location of the box. Refer to the instructions
in the following sections for the method of venting to be
used (vertical or horizontal). Maintain all clearances as
listed in these instructions.
2. This box can be mounted flush to the wall or roof, or the
box can be offset from the wall or roof by using field
supplied brackets. When mounting the box, consider
serviceability and access to the vent and combustion air
pipes.
3. If the box is to be mounted using field supplied brackets,
these brackets must be strong enough to rigidly secure
the box to the wall or roof, and should be made from
corrosion resistant material. After determining the length
of the field supplied brackets, attach them to the sides of
the box using several corrosion resistant sheet metal
screws. See figure 3 for typical installation and brackets.

6. Determine the length of the combustion air pipe to extend
through the wall. Refer to the following sections for the
minimum length of combustion air pipe to be used for the
method of venting being used, vertical or horizontal. Cut
the pipe to the proper length.
7. Slide the combustion air pipe over the vent pipe. Attach
the combustion air pipe to the adapter box using at least 3
non corrosive sheet metal screws. See figure 5.
Figure 5
Adapter Box Assembly with Combustion Air
Pipe Attached

Adapter Box Dimensions
Heater Sizes
130-225

Concentric Side
Exhaust
Combustion

A

B

C

81/4"

113/4"

4"

4"

6"

16"

4"

6"

8"

Heater Sizes
1
280-340 10 /2"

5

Heater Parts from ACF Greenhouses

INSTALLATION
8. Place this assembly (the adapter box, vent pipe and
combustion air pipe) through the wall or roof and verify that
the distance requirements as defined in the following
sections are met. Securely attach the assembly (adapter
box and vent and combustion air pipe) to the wall or roof
using appropriate fasteners.

1. The vent must terminate with a Gary Steel Model 1092 or
Briedert Type L cap for the appropriate pipe size.
2. The combustion air pipe must terminate with the cap
supplied by the manufacturer. This cap is specially
designed to work with the concentric vent system. Refer to
the parts list on page 5 for the appropriate part.
3. The bottom of the air intake pipe must terminate above the
snow line, or at least 12 inches above the roof, which ever
distance is greater.

Horizontal Concentric Venting:
Figure 6
Horizontal Concentric Vent
(rear pipe hidden)

4. The bottom of the vent cap must terminate at least 6 inches
above the top of the air intake cap.
5. To attach the caps, slide the combustion air cap over the
vent pipe and fasten it to the combustion air pipe with at
least 3 non corrosive fasteners. Then, attach the vent cap
to the vent pipe, also using at least 3 non corrosive
fasteners.
1"

To Exhaust
12"

To Combustion
Air Inlet

1. The vent pipe must terminate with the terminal supplied by
the manufacture for horizontal venting. Refer to the parts
list on page 5 for the appropriate part.
2. The combustion air pipe must terminate at least 1 inch from
the wall. This will prevent water from running down the wall
and into the pipe and allows for easy installation of the
combustion air intake guard.

6. Caulk the gap between the combustion air cap and the vent
pipe with silicone sealant, or other appropriate sealants
suitable for metal to metal contact and for temperatures of
350° F.

Two Pipe Venting
Two pipe venting refers to using two penetrations through an
exterior wall or roof. This method of venting is primarily used
for replacement heaters where two holes through the exterior of
a building exist. To vent using this method, either (2) Briedert
Type L caps or (2) Gary Steel Model 1092 caps provided with
your unit heater must be used. These caps are used for both
vertical and horizontal venting of the heater.

Vertical Two Pipe Venting
Figure 8
Vertical Venting - Two Pipes

3. Caulk between the wall and the air intake pipe.
4. Maintain 12 inches from the combustion air inlet to the back
of the vent terminal.
5. Attach the combustion air intake guard using non corrosive
screws as shown in figure 5. This guard must be placed at
the end of the pipe on the exterior of the building. This
guard helps to prevent animals and debris from entering the
combustion air pipe.

Vertical Concentric Venting:
Figure 7
Vertical Concentric Vent
(back view typical)

1. The bottom of the combustion air cap must be located
above the snow line or 12 inches above the roof, which ever
is greater.
2. The vent must terminate at least 1 foot above and 16
inches horizontally from the combustion air inlet.
3. When the vent passes through a combustible roof, a metal
thimble 4 inches greater than the vent diameter is
necessary. If there is 6 feet or more of vertical vent pipe in
the open space between the unit heater and where the vent
pipe passes through the roof, the thimble need only be 2
inches greater than the diameter of the vent pipe. If a
thimble is not used, all combustible material must be cut
away to provide a 6 inch clearance. Any material used to
close the opening must be noncombustible.
6

Heater Parts from ACF Greenhouses

INSTALLATION
Horizontal Two Pipe Venting

Table 2
Gas Pipe Capacities

Figure 9
Horizontal Venting - Two Pipes

In Cu. Ft. per Hour with Pressure Drop of 0.3 in W.C. with Specific Gravity 0.60.

Length
of Pipe
in Ft.

Diameter of Pipe — Inches

15
30
45
60
75

1/2

3/4

1

1-1/4

1-1/2

76
73
44
50

218
152
124
105
97

440
285
260
190
200

750
590
435
400
345

1220
890
700
610
545

88
80

160
168
158
120
128

320
285
270
242
225

490
450
420
380
350

205
190
178
170
140
119

320
300
285
270
226
192

90
105
120
150
180

1. When horizontal vents pass through a combustible wall (up
to 8 inches thick), the vent passage must be constructed
and insulated as shown in Figure 10.
2. The termination of horizontally vented system must extend
12 inches beyond the exterior surface of an exterior wall.
3. The combustion air pipe must be a minimum of 16 inches
below the vent pipe, and 24 inches from the exterior wall.
4. Support the vent and combustion air pipe as shown in
Figure 10.

Figure 10
Exhaust Vent Construction Through Combustible Walls
and Support Bracket
FIBER GLASS
INSULATION
MIN. 2"

METAL
SLEEVE
2" MIN.
VENT PIPE
DIAMETER

METAL FACE
PLATE

METAL
SLEEVE

9"

2" MIN.
1"

1"

45
9"

VENT TERMINATION
SUPPORT BRACKET
(where required)
(Make from 1" x 1" steel angle)

Piping

CAUTION
Gas pressure to unit heater controls must never exceed 14"
W.C. (1/2 psi).
When leak testing the gas supply piping system, the appliance
and its combination gas control must be isolated during any
pressure testing in excess of 14" W.C. (1/2 psi).
The appliance should be isolated from the gas supply piping
system by closing its field installed manual shut-off valve.
1. Installation of piping must be in accordance with local
codes, and ANSI Z223.1, “National Fuel Gas Code,” or
CAN/CGA-B149 in Canada.
2. Piping to units should conform with local and national
requirements for type and volume and gas handled, and
pressure drop allowed in the line. Refer to Table 5, to
determine the cubic feet per hour (cfh) for the type of gas

210
240
270
300
450
600

Diameter of Pipe — Inches

Length
of Pipe
in Ft.

2

3

4

6

8

15
30
45
60
75

2480
1650
1475
1150
1120

6500
4700
3900
3250
3000

12880
9700
7900
6800
6000

38700
27370
23350
19330
17310

79000
55850
45600
39500
35300

90
105
120
150
180

930
920
860
710
720

2600
2450
2300
2000
1950

5400
5100
4800
4100
4000

15800
14620
15680
12240
11160

32250
29650
27920
25000
22800

210
240
270
300
450
600

660
620
580
545
450
380

1780
1680
1580
1490
1230
1030

3700
3490
3250
3000
2500
2130

10330
9600
9000
8500
7000
6000

21100
19740
18610
17660
14420
12480

and size of unit to be installed. Using this cfh value and the
length of pipe necessary, determine the pipe diameter from
Table 2. Where several units are served by the same main,
the total capacity, cfh, and length of main must be
considered. Avoid pipe sizes smaller than 1/2". Table 2
allows for the usual number of fittings with a 0.3; W.C.
pressure drop. Where the gas supplied has a specific
gravity other than 0.60, apply the multiplying factor as given
in Table 3.
3. After threading and reaming the ends, inspect piping and
remove loose dirt and chips.
4. Support piping so that no strains are imposed on unit or
controls.
5. Use two wrenches when connecting piping to unit controls.

Table 3
Specific Gravity Conversion Factors
Multiplying factors to be used with Table 1 when the specific gravity of gas is
other than 0.60.

Natural Gas

Propane Gas

Specific
Gravity

Factor

Specific
Gravity

Factor

0.55
0.60
0.65

1.04
1.00
0.962

1.50
1.53
1.60

0.633
0.626
0.612

7

Heater Parts from ACF Greenhouses

INSTALLATION
6. Provide a drip pocket before each unit and in the line where
low spots cannot be avoided. (See Figure 7).
7. Take-off to unit should come fro top or side of main to avoid
trapping condensate.
8. Piping, subject to wide temperature variations, should be
insulated.
9. Pitch piping up toward unit at least 1/4" per 15' of horizontal
run.
10. Compounds used on threaded joints of gas piping must be
resistant to action of liquefied petroleum gases.
11. Purge air before lighting unit by disconnecting pilot tubing at
combination gas control. In no case should line be purged
into heat exchanger.
12. After installation, check system for gas leaks, using a soap
solution.
13. Install a ground joint union and a manual shut off valve
immediately upstream of the unit including a 1/8" NPT
plugged tapping accessible for test gage connection. (See
Figure 7).
14. Allow at least 5 feet of piping between any high pressure
regulator and unit control string.
15. When Pressure/Leak testing, pressures above 14'' W.C. (1/2
psi), close the field installed shut-off valve, disconnect the
appliance and its combination gas control from the gas
supply line, and plug the supply line before testing. When
testing pressures 14" W.C. (1/2 psi) or below, close the
manual shut-off valve on the appliance before testing.

Figure 7
Recommended Piping to Controls
GAS
SUPPLY LINE
GROUND
JOINT
UNION

GAS
SUPPLY LINE

A manual shut off valve with
1/8' N.P.T. plugged tapping,
accessible for test gage
connection must be installed
immediately upstream of the
gas supply connection to the
appliance.

TO
CONTROLS
PLUGGED
1/8" NPT TEST
GAGE CONNECTION

3"
MIN.

The power to these units should be protected with a fused
disconnect. Units for use with three-phase electric power must
be provided with a motor starter having properly sized overload
protection.
Location of thermostat should be determined by heating
requirements and be mounted on an inside wall about 5' above
floor level . . . where it will not be affected by heat from the unit
or other sources, or drafts from frequently opened doors. See
instructions packed with thermostat.

Installation of Blower Models (BSH Units)

CAUTION
Proper air flow and distribution, across the hat exchanger must
be provided to prevent early failure of the blower unit heater.

Attachment of Field Installed Ductwork,
Blower BSH Models Only
Burned-out heat exchanger and shorter equipment life will
result from not providing uniform air distribution.

CAUTION
Do not attempt to attach ductwork of any kind to propeller PSH
models.
When installing unit, always follow good duct design practices
for even distribution of the air across the heat exchanger.
Recommended layouts are shown below. When installing blower
units with ductwork, the following must be done.
1. Provide uniform air distribution over the heat exchanger.
Use turning vanes where required. See figures below.
2. Provide removable access panels in the ductwork on the
downstream side of the unit. These openings should be
large enough to view smoke or reflect light inside the casing
to indicate leaks in the heat exchanger and to check for hot
spots on exchanger due to poor air distribution or lack of
sufficient air (cfm).
3. If ductwork is connected to the rear of the unit, use Modine
blower enclosure kit, or if using field designed enclosure,
maintain dimensions of proper blower enclosure as shown.
on page 19.

CAUTION
DRIP
POCKET

Wiring General

CAUTION
Disconnect power supply before making wiring connections to
prevent electrical shock and equipment damage. ALL UNITS
MUST BE WIRED STRICTLY IN ACCORDANCE WITH
WIRING DIAGRAM FURNISHED WITH UNIT.
ANY WIRING DIFFERENT FROM WIRING DIAGRAM MAY BE
HAZARDOUS TO PERSONS AND PROPERTY.
Any damage to or failure of Modine units caused by incorrect
wiring of the units is not covered by MODINE’S STANDARD
WARRANTY (see Back Cover).
All field installed wiring must be done in accordance with the
National Electrical Code ANSI/NFPA 70 — Latest Edition or
Canadian Electrical Code CSA C22.1 Part 1 or local codes.
Unit must be electrically grounded according to these codes.
See wiring diagram shipped with unit. For optional wiring
diagrams see Bulletin 6-453.

Check for red heat exchanger tubes. If bottom of tubes become
red while blower unit is in operation, check for proper air volume
and air distribution. Adjust blower speed or correct discharge
duct design to correct problem.

Installation of Blower Units (BSH)
Determining Blower Speed
The drive assembly and fan motor on all gas-fired blower units
are factory assembled. The adjustable motor sheave has been
pre-set to obtain maximum air flow without any external static
pressure. The motor sheave should be adjusted as required
when the unit is to be operated at other air flows and/or with
external static pressures. Adjustment must always be within the
performance range shown on pages 14 and 15 and the
temperature rise range shown on the unit’s rating plate.
To determine the proper blower speed and motor shave turns
open, the conditions under which the unit is to operate must be
know. If the blower unit is to be used without duct work, nozzles
or filters, the only criteria for determining the motor sheave
turns open and blower speed is the amount of air flow to be
delivered. The performance tables for blower models are shown
on pages 14 and 15. As an example, a model BSH150 unit

8

Heater Parts from ACF Greenhouses

INSTALLATION
Recommended Installations
A
TURNING
VANES
3" MIN.

B

C

3" MAX.
12"
MIN.
3" MIN.

B

B

12"
MIN.

12"

A

3" MAX.

Dimension “B” Should Never
Be Less than 1/2 of “A”

B

12" MIN.

A

A

TURNING
VANES
BAFFLE

SIDE VIEW

SIDE VIEW

TOP VIEW

E

F

D

12"
MIN.

12"
MIN.

B
B

A
TURNING
VANES

A

BAFFLE

TURNING
VANES

BAFFLE
SIDE VIEW

SIDE VIEW

without filters operating with one external static pressure, that
is, no duct work, nozzles, etc., and is to deliver an air flow of
2071 cfm (cfm = cubic feet of air) requires that the unit be
supplied with a 1/2 hp motor, a C25 drive and, the motor
sheave set at 5 turns open to achieve a blower speed of 255
rpm (see performance table for units without blower enclosure,
page 14). See “Blower Adjustments” for setting of motor sheave
turns open.
If a blower unit is to be used with ductwork or nozzles, etc., the
total external static pressure under which the unit is to operate,
and the required air flow must be known before the unit can be
properly adjusted. Any device added externally to the unit, and
which the air must pass through, causes a resistance to air
flow. This resistance is called pressure loss. The total of the
pressure losses must be determined before adjusting the
blower speed.
If Modine filters are used, the expected pressure loss through
the filters is included in performance data on page 15. If Modine
supplied discharge nozzles are used, the expected pressure
loss of the nozzles can be found footnoted at the bottom of
page 10. If filters, nozzles, or ductwork are to be used with the
unit, and they are not supplied by Modine, the design engineer
or installing contractor must determine the pressure loss for the
externally added devices, or ductwork, to arrive at the total
external static pressure under which the unit is to operate.
Once the total external static pressure and the required air flow
are known, the operating speed of the blower can be
determined and the correct motor sheave adjustments made.
As an example, let’s say a model BSH150 is to be used with a
Modine supplied blower enclosure, Modine supplied filters, are
to be attached to ductwork supplied by others, and the unit is to
move 2071 cfm of air flow against an external static pressure of
0.2" W.C. static pressure, it is seen that the unit will require a
1/2 hp motor using a C22 drive, and the motor sheave should
be set at 1 turn open to achieve a blower speed of 415 rpm.
See “Blower Adjustments” for setting of motor sheave turns
open.

3.

4.
5.

6.

TOP VIEW

between the sheaves (refer to Figure 9a). Since the belt
tension will decrease dramatically after an initial run-in
period, It is necessary to periodically re-check the tension.
excessive tension will cause bearing wear and noise.
The blower bearings are lubricated for life; however, before
initial unit operation the blower shaft should be lubricated at
the bearings with SAE20 oil. This will reduce initial friction
and start the plastic lubricant flowing.
Make electrical connections according to the wiring
diagram.
Check rotation of the blower. Motor should be in clockwise
rotation when facing motor pulley. If rotation is incorrect,
correction should be made by interchanging wiring within
the motor. See wiring diagram on the motor.
The actual current draw of the motor should be determined.
Under no condition should the current draw exceed that
shown on the motor rating plate.

Figure 8
Blower Model Installation
Threaded Rod
Mounting Brackets on
Blower Assembly
Motor Mounting
Bracket

Motor Sheave
(Movable Face
to Outside)

Blower
Sheave

Motor
Adjustment
Screw

To Install (Figure 8):
1. Remove and discard the tie down strap and the shipping
block beneath the belt tension adjusting screw. (Not used
on all models.)
2. Adjust belt tension adjusting screw for a belt deflection of
approximately 3/4" with five pounds of force applied midway

Combustion Air Inlet

Blower Housing

7. It is the installer’s responsibility to adjust the motor sheave to
provide the specified blower performance as listed on pages
14 and 15, for blower settings different
9

Heater Parts from ACF Greenhouses

OPERATION
from the factory set performance. The drive number on the
unit may be identified by referring to the Power Code
number on the serial plate of the unit (see page 23 for
model number nomenclature) and matching that number
with those shown on page 25. From the listing the drive
number can be determined.
8. Blower sheave and motor sheave should be measured to
assure correct drive is on unit. Refer to page 25 for drive sizes.

Figure 9a
Belt Tension Adjustment

Blower Adjustments
Following electrical connections, check blower rotation to
assure blow-through heating. If necessary, change wiring to
reverse blower rotation. Start fan motor and check blower
sheave RPM with a hand-held or strobe-type tachometer. RPM
should check out with the speeds listed in Performance Data
shown on pages 14 and 15 according to the job specifications.
A single-speed motor with an adjustable motor sheave is
supplied with these units. If blower speed changes are required,
adjust motor sheave as follows:

3/4" DEFLECTION
WITH 5# FORCE

CAUTION

NOTE: Do not fire unit blower adjustment has been made or
unit may cycle on limit (overheat) control.

Start-up and adjustment procedures should be performed by a
qualified serviceman.

1. Shut-off power before making blower speed adjustments.
Refer to Determining Blower Speed on page 8 and to Blower
Drive Selection on pages 14 and 15 to determine proper
blower RPM.

Check the gas inlet pressure at the unit upstream of the
combination gas control. The inlet pressure should be 6"-7"
W.C. on natural gas or 11"-14" W.C. on propane. If inlet pressure
is too high, install an additional pressure regulator upstream of
the combination gas control.
The pilot flame must be adjusted as described below. Purging
of air from gas lines, piping, and lighting the pilot should be
performed as described in ANSI Z223.1-latest edition “National
Fuel Gas Code” (CAN/CGA-B149 in Canada).
Be sure no obstructions block air intake and discharge of unit
heater.

2. Loosen and take belt off of motor sheave.
3. Loosen set screw on outer side of adjustable motor sheave.
(see Figure 9).
4. To reduce the speed of the blower, turn outer side of motor
sheave counterclockwise.
5. To increase the speed of the blower, turn outer side of motor
sheave clockwise.
6. Retighten motor sheave set screw, replace belt and retighten
motor base. Adjust belt tension adjusting screw such that there
is 3/4" belt deflection when pressed with 5 pounds of force
midway between the blower and motor sheaves (see Figure
9a). Since the belt tension will decrease dramatically after an
initial run-in period, it is necessary top periodically re-check the
tension to assure continual proper belt adjustment.
7. Check to make certain motor sheave and blower sheave are
aligned. Re-align if necessary.
8. Re-check blower speed after adjustment.

Prior to Operation
Although this unit has been assembled and fire-tested at the
factory, the following pre-operational procedures should be
performed to assure proper on-site operation.
1. Turn off power.
2. Check burner to insure proper alignment.
3. Check fan clearance. Fan should not contact casing when
spun by hand.
4. Check all electrical connections to be sure they are secure.

9. Check motor amps. Do not exceed amps shown on motor
nameplate. Slow blower if necessary.

5. If you are not familiar with the unit’s controls (i.e.
combination gas control), refer to the control manufacturer’s
literature supplied with the unit.

10. Check air temperature rise across unit. Check temperature
rise against values shown in Performance Tables on pages 14
and 15 to assure actual desired air flow is being achieved.

6. Check that all horizontal deflector blades are open a
minimum of 30° as measured from vertical.

11. If adjustments are required, re-check motor amps after final
blower speed adjustment.

Figure 9
Motor Sheave Adjustment

Lighting Instructions (Also on Unit)
1. Turn off power. Turn thermostat down. Move gas control
knob (or lever) to OFF and wait 5 minutes.
2. Move gas control knob (or lever) to ON.

SET
SETSCREW
SCREW

TOWARD
TOWARDMOTOR
MOTOR

3. Set thermostat at desired setting. (Pilot and main burner
will light automatically when thermostat calls for heat).

Shut Down Instructions
Turn off power and close manual gas valve.

After Initial Start Up
1. Check pilot flame adjustment as discussed below.
2. Check gas piping for leaks with a soap bubble solution to
insure safe operation.
ADJUSTABLE
HALF
ADJUSTABLE
HALF
OFOF
SHEAVE
SHEAVE

3. Check gas input rate, as described below, to assure proper
gas flow and pressure.

10

Heater Parts from ACF Greenhouses

Pilot Flame Adjustment

CHECKING INPUT RATE

The pilot is orificed to burn properly with an inlet pressure of 67" W.C. on natural gas and 11-14" W.C. on propane gas, but
final adjustment must be made after installation. Adjust to have
a soft steady flame 3/4" to 1" long and encompassing 3/8"-1/2"
of the tip of the thermocouple or flame sensing rod. Normally
this flame will produce satisfactory results. To adjust the flame
use pilot adjustment screw on combination gas control (for
location, see the combination gas control literature supplied
with unit). If the pilot flame is longer and larger than shown by
Figure 7, it is possible that it may cause soot and/or impinge on
the heat exchanger causing burnout. If the pilot flame is shorter
than shown it may cause poor ignition and result in the controls
not opening the combination gas control. A short flame can be
caused by a dirty pilot orifice. Pilot flame conditions should be
observed periodically to assure trouble-free operation.

Input Adjustments

Natural Gas Flame Control
Control of burner flames on units utilizing natural gas is
achieved by moving the gas manifold to either increase or
decrease primary combustion air. Prior to flame adjustment,
operate unit with casing closed for about five minutes.
Operation can be viewed through the sight glass on the rear of
the unit (see Figure 11a).
Lack of primary air will cause soft yellow-tipped flames. Excess
primary air produces whort, well-defined flames with a
tendency to lift off the burner ports. Proper operation with
natural gas provides a soft blue flame with a well-defined inner
cone.
To increase primary air, remove the access panel (see Figure
11a and 11b). Next loosen the fastening screws holding the
hinged bottom pan in place and lower the bottom pan (see
Figure 14). With the bottom pan lowered, loosen the manifold
mounting screws (see Figure 14) and tap the manifold away
from the mixer tubes until the yellow flames disappear. To
decrease the primary air, move the manifold closer to the mixer
tubes until flames no longer lift from burner ports, but being
careful not to cause yellow tipping. Retighten manifold mounting
screws after adjustment.
Once adjustment has been made all around the bottom pan.
Replace the access panel, again checking for a good tight seal
around the entire perimeter of the access panel. Observe the
burner flame through the sight glass to make sure proper flame
adjustment has been achieved.

Propane Gas Flame Control
Adjustable primary air shutters are attached to the orifices on
the gas manifold for units equipped for propane gas operation
(see Figure 15). An optimum flame will show a slight yellow tip.
Prior to flame adjustment, operate unit heater with casing
closed for at least five minutes. If flame adjustment is
necessary, remove the access panel (see Figure 11a and 11b)
and adjust primary air shutters. Loosen wing screws and push
shutters forward to reduce primary air until yellow flame tips
appear. Then increase primary air until yellow tips diminish to
just a slight yellow tip and an clean blue flame with a welldefined inner cone appears.
It may also be necessary to adjust the manifold position in
addition to adjusting air shutters to obtain the proper flame.
Follow the instructions under “Natural Gas Flame Control” for
adjusting the manifold.
Replace the access panel making suer a good tight seal is
achieved around the entire perimeter of the access panel.
Observe the burner flame through the sight glass to make sure
proper flame adjustment has been achieved.

The gas pressure regulator (part of the combination gas
control) is adjusted at the factory for average gas conditions. It
is important that gas be supplied to the heater in accordance
with the input rating stamped on the serial plate. Actual input
rating stamped on the serial plate. Actual input should be
checked and necessary adjustments made after the hater is
installed. Over-firing, a result of too high an input, reduces the
life of the unit, and increases maintenance. Under no
circumstances should the input exceed that shown on the rating
plate.

(A) Meter Timing Method
1. Shut off all other gas-burning equipment, including other
pilot lights served by the gas meter.
2. Start the heater and determine the number of seconds it
takes to consume 1 cu. ft. of gas. Two basic formulas are
useful:
F1 = 3600 C/T
F2 = F1/C
Where
F1 = input to heater, Btuh.
F2 = input to heater, cu. ft. per hr.
C = heating value of gas, Btu per cu. ft.
T = time to consume 1 cu. ft. of gas in sec.
The heating value of gas may be determined from the local
utility or gas dealer.
These are representative values:
GAS
Natural
Propane

Btu per cu. ft.
1000-1150
2500

3. If the seconds for 1 cu. ft. are more (input less) than shown
in Table 5 for model being tested, remove the access panel
(see Figure 11a). With access panel removed, locate the
combination gas control and pressure regulator adjustment
screw (see Figure 11b). Remove the cap screw from he
pressure regulator and take one clockwise turn at a time on
the adjustment screw until the correct time is obtained. If
the seconds are less (input greater)than indicated in the
table, follow the same procedure in a counter-clockwise
direction.
If the correct number of seconds cannot be obtained check
orifice size. Correct orifices can be obtained from Modine
Manufacturing Company, Racine, Wisconsin. When requesting
orifices, state type of gas, heating value, and its specific gravity.
Also give model number of unit.
For example, if the input to the heater is 100,000 Btuh and the
heating value of the gas is 1000 Btu per cu. ft., then, by the
second formula, the input is 100 cu. ft. per hr. Table 4 indicates
the time for one revolution of various size meter dials with
various input rates. If a 1 cu. ft. meter dial is used, we proceed
down the cu. ft. column to 100 cu. ft. per hr. and then
horizontally to the left to determine a time of 36 seconds for
one revolution of the dial. Similarly, if the 1/2 cu. ft. dial is used,
we determine a time of 18 seconds for one revolution at the
required input.
After proper firing rate has been achieved, replace regulator
cap crew and replace access panel, making sure a good tight
seal is achieved around the entire perimeter of the access
panel.

11

Heater Parts from ACF Greenhouses

CHECKING INPUT RATE
Table 4

6.

Time for 1
Revolution,
Sec.

Input, Cu. Ft. per Hour, When Meter Dial Size is:
1/2 cu. ft.

1 cu. ft.

2 cu. ft.

5 cu. ft.

10
12
14
16
18
20
22
24
26
28
30
35
40
45
50
55
60
70
80
90
100
120

180
150
129
112
100
90
82
75
69
64
60
51
45
40
36
33
30
26
22
20
18
15

360
300
257
225
200
180
164
150
138
129
120
103
90
80
72
65
60
51
45
40
36
30

720
600
514
450
400
360
327
300
277
257
240
206
180
160
144
131
120
103
90
80
72
60

1800
1500
1286
1125
1000
900
818
750
692
643
600
514
450
400
360
327
300
257
225
200
180
150

If pressure as indicated by “U” tube is less than 1/2" higher
or lower than indicated in TAble 5, adjust regulator as
described under “meter-Timing method,” Step 3.
If pressure as indicated by “U” tube is more than 1/2"
higher or lower than indicated in Table 5, check inlet
pressure at unit. The inlet pressure should be 6"-7" W.C.
pressure on natural gas and 11"-14" W.C. on propane gas.

After adjustment move gas control knob (or level) to off and
replace 1/8" pipe plug. With plug in place move knob (or leave)
to on.) Replace the access panel, making use a good tight seal
is achieved around the entire perimeter of the access panel.

Figure 11a

VENTING
LABEL

POWER EXHAUSTER
PRESSURE
SWITCH
JUNCTION
BOX

FAN GUARD

FAN MOTOR

SIGHT GLASS

LIGHTING
INSTRUCTION &
RATING PLATE

Meter-Timing Gas
(Time required for one revolution is charted for various size
meter dials and various rates of gas input in cu. ft. per hour. To
convert to Btuh, multiply by the heating value of the gas used.)

Figure 10
Dials of Typical Gas Meter

GAS SUPPLY
CONNECTION
(Not Shown)
COMBUSTION AIR
INLET COLLAR

ACCESS PANEL

Figure 11b

(B) Pressure Method

COMBINATION
GAS CONTROL

The pressure method determines input by measuring the
pressure of the gas in the manifold in inches of water.
1.

Determine correct manifold pressure from Table 5.

2.

Remove access panel (see Figure 11a) and locate
combination gas control.

3.

Move gas control knob (or lever) to off.

4.

Remove the 1/8" pipe plug in outlet pressure tap in
combination gas control (see Figure 11b) and attach water
manometer or “U” tube which is at least 12" high.

5.

Follow lighting instructions and turn thermostat up to get
unit to fire.

MANIFOLD
MAIN BURNER

IGNITION
CONTROL
IGNITION
CABLE

PILOT
TUBING

MANIFOLD
PRESSURE TAP

PRESSURE REGULATOR
ADJUSTMENT SCREW
(UNDER CAP SCREW)

CAUTION
Check the gas inlet pressure at the unit upstream of the
combination gas control. The inlet pressure should be 6"-7"
W.C. on natural gas or 11"-14" W.C. on propane. If inlet pressure
is too high, install and additional pressure regulator upstream of
the combination gas control.
Important —Inlet pressure and manifold pressure must be
checked with unit in operation when making final adjustments.

12

Heater Parts from ACF Greenhouses

CHECKING INPUT RATE
Table 5
Manifold Pressure & Gas Consumption➀
Typical Heating Value (BTU/Cu.Ft.)
Specific Gravity

Model

Natural

Propane

1040
0.60

2500
1.53

3.5

10.0

Manifold Pressure inches w.c.
PSH130
BSH130

Cfh . . . . . . . . . .
Gal/Hr. Propane
Sec/cu.ft. . . . . . .
Orifice Drill Size

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
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.

.
.
.
.

.
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.

.
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.

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.
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.
.
.

.
.
.
.

.
.
.
.

125
—
29
24

52
1.42
69
41

PSH150
BSH150

Cfh . . . . . . . . . .
Gal/Hr. Propane
Sec/cu.ft. . . . . . .
Orifice Drill Size

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
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.

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.

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.
.
.

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.

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.

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.
.

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.
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.
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.
.
.

.
.
.
.

.
.
.
.

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.
.
.

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.
.
.

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.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

144
—
25
29

60
1.64
60
44

PSH170
BSH170

Cfh . . . . . . . . . .
Gal/Hr. Propane
Sec/cu. ft. . . . . .
Orifice Drill Size

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

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.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

163
—
25
27

68
1.86
60
43

PSH225
BSH225

Cfh . . . . . . . . . .
Gal/Hr. Propane
Sec/cu.ft. . . . . . .
Orifice Drill Size

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
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.

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.
.

.
.
.
.

.
.
.
.

.
.
.
.

216
—
17
19

90
2.46
40
37

PSH280
BSH280

Cfh . . . . . . . . . .
Gal/Hr. Propane
Sec/cu. ft. . . . . .
Orifice Drill Size

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
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.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

269
—
13
21

112
3.06
32
39

PSH340
BSH340

Cfh . . . . . . . . . .
Gal/Hr. Propane
Sec/cu. ft. . . . . .
Orifice Drill Size

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
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.

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.

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.
.
.

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.
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.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

327
—
11
22

136
3.72
26
40

No. of
Orifices

2

3

3

3

4

5

➀ Above gases based on average standards. Units can be furnished for gases of different values and specific gravities. (Gas/Hr. Propane based on 60°F, 30" Hg, 91,500
Btu/Gal.

Table 6
Orifice Drill sizes with Decimal Equivalents
Main Burner Orifices

Pilot Orifice Identity Numbers
Pilot Burner
Manufacturer

Drill
Size

Dia.
Decimal
Equivalent

Drill
Size

Dia.
Decimal
Equivalent

19
21

.1660
.1590

37
39

.1040
.0995

22
24

.1570
.1520

40
41

.0980
.0960

27
29

.1440
.1360

43
44

.0890
.0860

Honeywell
Robertshaw

Identity No.
Natural Gas

Identity No.
Propane Gas

BCR-18

BCR-11 or -12
➁

1

8
N

Johnson
➁

7715

➁

L
1

O
P

4710

As number appears on top of pilot orifice.

13

Heater Parts from ACF Greenhouses

SEPARATED COMBUSTION PROPELLER UNIT HEATERS
The minimum recommended installation clearance from
top and rear of unit (motor) is six inches. Clearance to
sides is eighteen inches, and clearance at bottom should
equal “C” dimension shown in table for each model.

C

A
H

F
K

DD

CC

X

W

J

DO NOT USE PROPELLER UNITS WITH DUCT WORK.

AA
G

K

E

➁
GAS SUPPLY
CONNECTION

COMBUSTION AIR
INLET COLLAR
(SIZES 130-225)
BB

2 8"
7/

4" ROUND FOR
PSH 130 thru 225
MODELS ONLY

B

COMBUSTION AIR
INLET COLLAR
(SIZES 280 & 340)

33/8"

31/8"

FF

D (OPENING)

41/2"
OVAL COLLAR FITS
6" ROUND PIPE FOR
MODELS PSH 280 & 340 ONLY

31/8"

EE

L
(MIN. DISTANCE TO WALL)

Dimensions (in inches) — PSH
Dimension
A
B
C
D
E
F
G
H
AA
BB
CC
DD
EE
FF
J (Round)
K➀
Natural Gas Connections ➂
W
X
L
Fan Diameters
Approx. Ship. Wt.

PSH 130

PSH 150

PSH 170

PSH 225

PSH 280

PSH 340

23-1/2
35-1/2
22
21-1/16
20
12-1/2
1
19-7/8
8
7 1/2
1
3-1/4
32-9/16
6-1/2
4
3/8-16
1/2
—
—
38-3/8
18
198

25-5/8
40-1/2
25
23-3/16
24
14-1/2
2
22
9
7-1/2
1/8
3-1/4
36
6-1/2
4
3/8-16
1/2
—
—
42
20
244

25-5/8
40-1/2
25
23-3/16
24
14-1/2
2
22
9
7-1/2
1/8
3-1/4
36
6-1/2
4
3/8-16
1/2
—
—
42
20
246

28-5/8
40-1/2
25
26-3/16
24
14-1/2
2
25
9
7-1/2
1/8
3-1/4
36
6-1/2
4
3/8-16
1/2
—
—
42
22
272

33-5/8
40-1/2
25
31-3/16
24
—
1-5/8
30
9
7-1/2
1-3/8
3-5/8
36-1/16
5-7/8
6
3/8-16
3/4
5
16
42
22
328

40
40-1/2
25
37-1/2
24
—
1-5/8
36-3/8
9
7-1/2
1-3/8
3-5/8
36-1/16
5-7/8
6
3/8-16
3/4
5
16
48
24
422

➀ PSH 130 through PSH 225 — 2 holes.
PSH 280 & PSH 340 — 4 holes.
➁ Dimension from rear of unit burner box to center line of gas pipe connection is 6-23/32" for PSH 130 and 6-1/2" for all other models.
➂ For natural gas.

Performance—PSH

Model
PSH 130
PSH 150
PSH 170
PSH 225
PSH 280
PSH 340

Btu/Hr
Input
➄
130,000
150,000
170,000
225,000
280,000
340,000

Btu/Hr
Output

CFM
@ 70°F

Outlet
Velocity

Air
Temp.
Rise

106,600
123,000
139,400
184,000
229,600
275,400

2540
2900
2900
4275
4400
5300

940
810
820
1060
960
980

39
39
45
40
48
48

Max. Mtg.
Height
(Ft.) ➃
12
16
16
20
20
20

Heat
Throw
(Ft.) ➃
50
50
50
65
65
65

Standard Motor Data ➅
HP

Amps

RPM

Type

1/6
1/6
1/6
1/3
1/2
1/2

2.8
2.8
2.8
5.4
6.8
6.8

1075
1075
1075
1075
1075
1075

PSC
PSC
PSC
PSC
PSC
PSC

➃ At 65°F ambient and unit fired at full rated input. Max mounting height as measured from bottom of unit, and without deflector hoods.
➄ Note: Ratings shown are for elevations up to 2,000 feet. For elevations above 2,000 feet, ratings should be reduced at the rate of 4% for each 1,000 feet above sea
level. (In Canada see Rating Plate.) Reduction of ratings requires use of high altitude kit.

➅ Data listed is for standard 115-volt, 60-Hertz, single-phase motors. All single phase motors are totally enclosed and thermal overload protected.

14

Heater Parts from ACF Greenhouses

SEPARATED COMBUSTION BLOWER UNIT HEATERS
The minimum recommended
installation clearance from top and
rear of unit (motor) is six inches.
Clearance to sides is eighteen
inches, and clearance at bottom
5 / "“C” dimension shown
should equal
in table for each model.

➀ L = C + P (APPROX.)
A

C
DD

F

H

N
X

5 9 /16 "

P

CC

W

K

J
3/4"

9 16

O

AA
G
K

QxV
B

E

➁
GAS SUPPLY
CONNECTION

RxT
COMBUSTION AIR
INLET COLLAR
(SIZES 130 - 225)

COMBUSTION AIR
INLET COLLAR
(SIZES 130-225)
BB

27/8"

S

FF

3 1/8"
4 1/2"
M
OVAL COLLAR FITS
6" ROUND PIPE FOR
MODELS BSH 280 & 340 ONLY

D (OPENING)

4" ROUND FOR
BSH 130 thru 225
MODELS ONLY
33/8"

4 7/8"

BLOWER
ENCLOSURE
(OPTIONAL)

31/8"

FILTER RACK
(OPTIONAL)

EE

Dimensions (in inches) — BSH
Dimension
A
B
C
D
E
F
G
H
AA
BB
CC
DD
EE
FF
J (Round)
K➂
Natural Gas Connections
W
X
M
N➃
O
P
Q (Height)
Blower
Inlet Duct/R (Height)
Enclosure
Filter Rack Width T
(Accessory)
Width V
S (Ctr. to Ctr. of Blower Mtg. Holes
Motor Pulley Diameter ➄
Standard Blower Pulley Diameter
Approx. Shipping Weight
➀
➁
➂
➃
➄

BSH 130
23-1/2
35-1/2
22
21-1/16
20
12-1/2
1
19-7/8
8
7-1/2
1
3-1/4
32-9/16
6-1/2
4
3/8-16
1/2
—
—
47-3/4
21
7-1/4
30
21-3/8
20
27-1/2
29
17-3/8
3
13
240

BSH 150
25-5/8
40-1/2
25
23-3/16
24
14-1/2
2
22
9
7-1/2
1/8
3-1/4
36
6-1/2
4
3/8-16
1/2
—
—
52-3/8
24-1/2
8-1/2
34
25
23-3/4
32-3/4
34
20-3/8
3
13
322

BSH 170
25-5/8
40-1/2
25
23-3/16
24
14-1/2
2
22
9
7-1/2
1/8
3-1/4
36
6-1/2
4
3/8-16
1/2
—
—
52-3/8
24-1/2
8-1/2
34
25
23-5/8
32-3/4
34
20-3/8
3
13
322

BSH 225
25-5/8
40-1/2
25
26-3/16
24
14-1/2
2
25
9
7-1/2
1/8
3-1/4
36
6-1/2
4
3/8-16
1/2
—
—
52-3/8
24-1/2
8-1/2
34
25
23-5/8
32-3/4
34
20-3/8
3
13
344

BSH 280
33-5/8
40-1/2
25
31-3/16
24
—
1-5/8
30
9
7-1/2
1 3/8
3-5/8
36-1/16
5-7/8
6
3/8-16
3/4
5
16
52-3/8
17-15/16
8-1/2
36
25
23-5/8
42-7/8
44-1/4
20-3/8
3
9
436

BSH 340
40
40-1/2
25
37-1/2
24
—
1-5/8
36-3/8
9
7-1/2
1 3/8
3-5/8
36-1/16
5-7/8
6
3/8-16
3/4
5
16
58-1/2
22-1/16
8-1/2
36
25
23-5/8
42-7/8
44-1/4
20-3/8
3
9
510

On blower units L = C + P is distance from front of unit to back of blower enclosure and minimum of distance to wall.
Dimension from rear of unit burner box to center line of gas pipe connection is 6-23/32" for BSH 130 and 6-1/2" for all other models.
BSH 130 through BSH 225 – 4 holes. BSH 280 and BSH 340 – 6 holes.
Distance between mounting hole in unit casing and mounting hole on blower, except on 280 and 340, then distance from rear mounting hole in casing.
Motor pulley is adjustable.
Note: Mounting heights and throws for BSH models, without ductwork or nozzles, and at a cfm yielding a 55°F
temperature rise are the same as those listed for equivalent size PSH units.

Performance — BSH

Model

Btu/Hr
Input
➆

Btu/Hr
Output

CFM
@ 55°F
Temp.
Rise

BSH 130
BSH 150
BSH 170
BSH 225
BSH 280
BSH 340

130,000
150,000
170,000
225,000
280,000
340,000

106,600
123,000
139,400
182,250
229,600
275,400

1795
2071
2347
3068
3865
4636

Outlet
Velocity
@55°F
Temp.
Rise

CFM
Range

Air
Temp.
Rise
Range

682
596
675
781
852
869

1161-1795
1340-2071
1519-2347
1985-3068
2501-3865
3000-4636

55-85
55-85
55085
55-85
55-85
55-85

Max. Mtg.
Heat
Height (Ft.) Throw (Ft.)
@ 55°F
@ 55°F
Temp. Rise Temp. Rise
➅
➅
11
10
11
13
14
15

30
25
30
35
40
40

Standard Motor Data ➇
HP

Amps

RPM

Type

1/4
1/2
1/2
3/4
1
1

5.4
7.8
7.8
10.2
13.2
13.2

1725
1725
1725
1725
1725
1725

SP
SP
SP
SP
CP
CP

➅ At 65°F ambient and unit fired at full rated input. Max mounting height as measured from bottom of unit, and without deflector hoods.
➆ Note: Ratings shown are for elevations up to 2,000 feet. For elevations above 2,000 feet, ratings should be reduced at the rate of 4% for each 1,000 feet above sea
level. (In Canada see Rating Plate.) Reduction of ratings requires use of high altitude kit.

➇ Data listed is for standard 115-volt, 60-Hertz, single-phase motors. All single phase motors are totally enclosed and thermal overload protected.

15

Heater Parts from ACF Greenhouses

PERFORMANCE DATA — BLOWER UNIT HEATERS
Blower Models With or Without Blower Enclosures ➀ ➁ ➃ ➄
Air
Outlet
Air
Model Flow Velocity Temp.
Number CFM FPM Rise F
1795 682
55
1645 630
60
1519 587
65
BSH
1410 549
70
130
1316 517
75
1234 489
80
1161 464
85
2071 596
55
1898 551
60
1752 513
65
BSH
1627 480
70
150
1519 452
75
1424 427
80
1340 405
85
2347 675
55
2151 624
60
1986 581
65
BSH
1844 544
70
170
1721 512
75
1613 484
80
1519 459
85
3068 781
55
2813 722
60
2596 672
65
BSH
2411 630
70
225
2250 592
75
2109 560
80
1985 531
85
3865 725
55
3543 670
60
3271 624
65
BSH
3037 584
70
280
2835 550
75
2657 519
80
2501 493
85
4636 869
55
4250 804
60
3923 748
65
BSH
3643 701
70
340
3400 659
75
3188 623
80
3000 591
85

➀
➁
➂
➃
➄

0.0 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
385
0
355
1
325
2
305 1/4 -21
3
285
3-1/2
270
4-1/2
250
5
255 1/2 -25
5
235 — —
—
220 — —
—
205 — —
—
190 — —
—
180 — —
—
170 — —
—
290
3-1/2
265 1/2 -25 4-1/2
245
5
230 — —
—
215 — —
—
200 — —
—
190 — —
—
385
0
345
1-1/2
315 3/4 -25 2-1/2
285
3-1/2
260
4-1/2
240 — —
—
220 — —
—
530
1/2
490
1-1/2
450
3
420 1 -18 3-1/2
395
4
370
5
350 — —
—
610 1-1/2 -16
1/2
550
0
500
1-1/2
460
2-1/2
420 1 -219 3-1/2
390
4-1/2
360
5

0.1 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
460
1
435 1/3 -57
2
415
2-1/2
395
3
380
0
365 1/4 -21
1/2
350
1-1/2
330
2
310
3
295
3-1/2
280 1/2 -25
4
270
4-1/2
260
4-1/2
250
5
360
1
335
2
305
2-1/2
290 1/2 -25
3
280
3-1/2
270
4
250
4-1/2
440 3/4 -22
1/2
415
1
390
0
365 3/4 -25
1/2
350
1
330
2
315
2-1/2
575 1-1/2 -23 3-1/2
535
1/2
500
1-1/2
470
2-1/2
445 1 -18
3
425
3-1/2
405
4
655 2 -32
1
605 1-1/2 -16
1/2
560
0
525
1
490 1 -219 1-1/2
465
2-1/2
440
3

0.2 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
520
1
500
1-1/2
480
2
465 1/3 -15 2-1/2
450
3
440
3
430
3-1/2
390
0
375
1/2
360
1
245 1/2 -25 1-1/2
335
2
325
2
315
2-1/2
420 1/2 -22
1
400
1-1/2
385
0
370
1/2
355 1/2 -25
1
345
1-1/2
335
2
490
1-1/2
465
2-1/2
440 3/4 -18
3
420
3-1/2
405
4
390 3/4 -25
0
375
1/2
615 1-1/2 -23 2-1/2
580
3-1/2
545
1/2
520
1
495 1 -18 1-1/2
475
2
455
2-1/2
690 2 -32
0
645
1-1/2
605 1-1/2 -16
1/2
575
1
545
1/2
520 1 -219
1
500
1-1/2

0.3 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
570 — —
—
550 1/2 -96
3
535
1/2
1
520 1/3 -15
1
510
1-1/2
500
2
490
0
445
1/2
430
1
415 1/2 -22
1-1/2
405
2
395
0
390 1/2 -25
0
380
2
470 3/4 -18
0
455
1/2
440
1
425
1
415
405 1/2 -22 1-1/2
2
395
1/2
535
1
510
2
485
470 3/4 -18 2-1/2
2-1/2
455
3
440
3-1/2
425
1-1/2
645
615 1-1/2 -23 2-1/2
3-1/2
585
0
565
1/2
540 1 -18
1
525
1
510
—
725 — —
0
685 2 -32
1-1/2
645
0
615
1
590 1-1/2 -16
1-1/2
570
550 1 -219
0

0.4 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
620
2
605 1/2 -96
2
590
2.5
580
2.5
570 1/3 -13 1-1/2
560
1-1/2
550
2
500 3/4 -18 1-1/2
485
2
475
2
470
2
460
2-1/2
455 1/2 -22
0
450
0
520
1
505
1-1/2
495 3/4 -18 1-1/2
485
2
475
2
465
2-1/2
460 1/2 -22
0
575 1 -16
1
555
0
535
1/2
520
1
510 3/4 -18
1
495
1-1/2
485
2
670 1-1/2 -23 1/2
640
1-1/2
620
2
595 1 -16 1/2
580
1
560 1 -18
0
545
1/2
750 — —
—
710 — —
—
680 2 -32
0
650
1
625
0
605 1-1/2 -16 1/2
585
1

Shaded area indicates unit standard motor and drive range.
For unit operation in non-shaded area; specify on order optional motor and drive number.
Ratings shown are for elevations up to 2,000 feet. For elevations above 2,000 feet, ratings should be reduced at the rate of 4% for each 1,000 feet above sea level.
(Does not apply in Canada — See Rating Plate.)
Pulley turns open are approximate. For proper operation, check blower rpm.
Rpm and pulley settings shown in bold type, in shaded areas for 0.0 static pressure, indicate factory settings of standard drives.

Important: Note for 575V Only ➆
Model
Number
BSH130

BSH280
BSH340
➆
➇

From this Catalog
Drive
HP
1/3
-13
1/4
-21
1/3
-15
1/3
-57
1-1/2
-23
1-1/2
-16

For 575V ➇
HP
Drive
1/3
-14
1/4
-165
1/3
-166
1/4
-167
1-1/2
-177
1-1/2
-178

Models not shown use same HP and drive number as cataloged.
Performance is the same; motor sheave can accommodate larger shaft.

16

Heater Parts from ACF Greenhouses

Blower Models With Filter ➀ ➁ ➃ ➄ ➅
Air
Outlet
Air
Model Flow Velocity Temp.
Number CFM FPM Rise F
1795 682
55
1645 630
60
1519 587
65
BSH
1410 549
70
130
1316 517
75
1234 489
80
1161 464
85
2071 596
55
1898 551
60
1752 513
65
BSH
1627 480
70
150
1519 452
75
1424 427
80
1340 405
85
2347 675
55
2151 624
60
1986 581
65
BSH
1844 544
70
170
1721 512
75
1613 484
80
1519 459
85
3068 781
55
2813 722
60
2596 672
65
BSH
2411 630
70
225
2250 592
75
2109 560
80
1985 531
85
3865 725
55
3543 670
60
3271 624
65
BSH
3037 584
70
280
2835 550
75
2657 519
80
2501 493
85
4636 869
55
4250 804
60
3923 748
65
BSH
3643 701
70
340
3400 659
75
3188 623
80
3000 591
85

➀
➁
➂
➃
➄
➅

0.0 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
445 1/3 -57 1-1/2
410
2-1/2
375
1/2
345
1-1/2
325 1/4 -21
2
300
3
285
3-1/2
285 1/2 -25 3-1/2
260
4-1/2
235 — —
—
220 — —
—
205 — —
—
190 — —
—
180 — —
—
325
2
295 1/2 -25 3-1/2
270
4-1/2
250
5
235 — —
—
215 — —
—
205 — —
—
465 3/4 -18 2 1/2
420
3 1/2
385
0
350
1
325 3/4 -25
2
300
3
280
4
595 1-1/2 -23
3
545
1/2
505
1 1/2
470
2 1/2
440 1 -18
3
415
3 1/2
390
4 1/2
685 2 -32
0
615 1-1/2 -16
0
560
0
515
1
470 1 -219
2
435
3
405
4

0.1 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
520 1/3 -15
1
485
1/2
460
1
435 1/3 -57
2
415
2-1/2
395
3
380 1/4 -21
0
350
1
325
2
305
3
290 1/2 -25 3-1/2
280
4
265
4 1/2
255
5
385
0
360
1
340
1-1/2
320 1/2 -25 2-1/2
305
3
290
3-1/2
275
4
515
1
485
2
455
2-1/2
430 3/4 -18 3-1/2
410
4
390
4-1/2
375 3/4 -25
1/2
645
1-1/2
600 1-1/2 -23
3
565
4
530
1/2
500 1 -18 1-1/2
475
2
455
2-1/2
715 — —
—
655 2 -32
1
605 1-1/2 -16
1/2
560
0
525 1 -219
1
490
1-1/2
465
2-1/2

0.2 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
575 — —
—
545
1/2
520
1
500 1/3 -15 1-1/2
480
2
460
2-1/2
450
3
415 1/2 -22
1
395
2
380
0
365
1/2
355 1/2 -25
1
345
1-1/2
335
2
445
0
425 1/2 -22
1
405
1-1/2
390
0
375 1/2 -25
1/2
365
1/2
355
1
550
0
515
1
490
1 1/2
465 3/4 -18 2 1/2
440
3
425
3-1/2
405
4
680 1-1/2 -23
0
640
1-1/2
605 1 -16
1/2
575
1
550
0
525 1 -18
1
505
1-1/2
740 — —
—
685 2 -32
0
640
1-1/2
600 1-1/2 -16
1/2
570
1-1/2
540 1 -219 1/2
515
1

0.3 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
615 — —
—
595 — —
—
575 — —
—
0
560
1/2
545
1/2
535 1/3 -15
1
525
0
460
0
445
1/2
430 1/2 -22
1
420
1-1/2
405
1 -1/2
400
0
390 1/2 -25
490 3/4 -18 1-1/2
2
470
0
455
1/2
440
1
425 1/2 -22
1
415
1-1/2
405
1/2
600 1 -16
1-1/2
565
1/2
540
1
515
495 3/4 -18 1-1/2
2
480
2-1/4
465
—
705 — —
1/2
665 1-1/2 -23
1-1/2
635
1/2
610
1
585 1 -16
1-1/2
565
1/2
545 1 -18
—
765 — —
—
720 — —
0
680 2 -32
1-1/2
645
0
615
1
590 1-1/2 -16
565
1-1/2

0.4 Static Pressure
Pulley
RPM
Drive Turns
➄ HP No. Open
660 — —
—
640 — —
—
625
2
610 1/2 -96
2
600
2
585 1/3 -13
1
575
1
530
1/2
515
1
505
1-1/2
495 3/4 -18 1-1/2
485
2
480
2
475
2
550
0
535
1/2
520 3/4 -18
1
510
1
500
1-1/2
495
1-1/2
485
2
635
0
610 1 -16
1/2
590
1
575
1
560
0
545 3/4 -18
1/2
535
1/2
725 — —
—
690
0
660 1-1/2 -23
1
635
1-1/2
615
0
595 1 -16
1/2
580
1
795 — —
—
745 — —
—
705 — —
—
670 2 -32
1/2
640
1-1/2
615 1-1/2 -16
0
595
1/2

Shaded area indicates unit standard motor and drive range.
For unit operation in non-shaded area; specify on order optional motor and drive number.
Ratings shown are for elevations up to 2,000 feet. For elevations above 2,000 feet, ratings should be reduced at the rate of 4% for each 1,000 feet above sea
level. (Does not apply in Canada — See Rating Plate.)
Pulley turns open are approximate. For proper operation, check blower rpm.
Rpm and pulley settings shown in bold type, in shaded areas for 0.0 static pressure on page 10, indicate factory settings of standard drives.
Blower models with filter require the use of a blower enclosure.

Important: Note for 575V Only ➆
Model
Number
BSH130

BSH280
BSH340
➆
➇

From this Catalog
Drive
HP
1/3
-13
1/4
-21
1/3
-15
1/3
-57
1-1/2
-23
1-1/2
-16

For 575V ➇
HP
Drive
1/3
-14
1/4
-165
1/3
-166
1/4
-167
1-1/2
-177
1-1/2
-178

Models not shown use same HP and drive number as cataloged.
Performance is the same; motor sheave can accommodate larger shaft.

17

Heater Parts from ACF Greenhouses

MOTOR DATA
Power Code Description — PSH Models ➀ ➂ ➃
Power
Code
01
02
04
05

Model
Electric
Power

PSH130

PSH150

115/60/1
230/60/1
200/60/3
200/460/60/3

1/6
1/6
1/3
1/3

1/6
1/6
1/3
1/3

PSH170

PSH225

PSH280

PSH340

1/3
1/3
1/3
1/3

1/2
1/2
1/2
1/2

1/2
1/2
1/2
1/2

Horsepower
1/6
1/6
1/3
1/3

Motor Data and Total Unit Power Requirements — PSH Models
Voltage
HP
1/6
1/3
1/2

Motor
Amps
2.8
5.4
7.5

115/60/1
Motor
Total
Rpm
Amps
1075
4.6
1075
7.2
1075
9.3

Total
Watts
400
610
800

Motor
Amps
1.5
2.5
3.5

230/60/1
Motor Total
Rpm Amps
1075
2.5
1075
3.5
1075
4.5

Total
Watts
400
610
800

Motor
Amps
1.9
2.6

200-208/60/3
Motor Total
Rpm
Amps
1140
1140

2.8
3.5

Total
Watts

Motor
Amps

230/460/3
Motor Total
Rpm
Amps

560
850

2.2/1.1
3.0/1.5

1140
1140

3.2/1.6
4.0/2.0

Total
Watts
560
850

Power Code Description — BSH Models ➁ ➂ ➃ ➄
Power
Code
01
02
03
04
81
05
06
07
08
82
09
10
11
12
83
13
14
15
16
84

Model
Electric Power
115/60/1
230/60/1
200-208/60/3
230/460/60/3
575/60/3
115/60/1
230/60/1
200-208/60/3
230/460/60/3
575/60/3
115/60/1
230/60/1
200-208/60/3
230/460/60/3
575/60/3
115/60/1
230/60/1
200-208/60/3
200/460/60/3
575/60/3

BSH130
HP
Drive
1/3
-13
1/3
-13
1/3
-13
1/3
-13
1/3
-14
1/4
-21
1/4
-21
1/4
-21
1/4
-21
1/4
-165
1/3
-15
1/3
-15
1/3
-15
1/3
-15
1/3
-166
1/3
-57
1/3
-57
1/3
-57
1/3
-57
1/3
-167

BSH150
HP
Drive
3/4
-18
3/4
-18
3/4
-18
3/4
-18
3/4
-18
1/2
-25
1/2
-25
1/2
-25
1/2
-25
1/2
-25
1/2
-22
1/2
-22
1/2
-22
1/2
-22
1/2
-22

HP
3/4
3/4
3/4
3/4
3/4
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2

BSH170
Drive
-18
-18
-18
-18
-18
-25
-25
-25
-25
-25
-22
-22
-22
-22
-22

HP
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
1
1
1
1
1
3/4
3/4
3/4
3/4
3/4

BSH225
Drive
-18
-18
-18
-18
-18
-22
-22
-22
-22
-22
-16
-16
-16
-16
-16
-25
-25
-25
-25
-25

BSH280
HP
Drive
1
-16
1
-16
1
-16
1
-16
1
-16
1
-18
1
-18
1
-18
1
-18
1
-18
1-1/2
-23
1-1/2
-23
1-1/2
-23
1-1/2
-23
1-1/2
-177

BSH340
HP
Drive
1-1/2
-16
1-1/2
-16
1-1/2
-16
1-1/2
-16
1-1/2
-178
1
-29
1
-29
1
-29
1
-29
1
-29

2
2
2

-32
-32
-32

Unit Power Requirements - Blower BSH Models
Voltage

HP

115/60/1
Total
Total
Amps
Watts

230/60/1
Total
Total
Amps
Watts

200-208/60/3
Total
Total
Amps
Watts

230/460/60/3
Total
Total
Amps
Watts

575/60/3 ➄
Total
Total
Amps
Watts

1/4

7.2

520

3.7

520

2.5

500

2.4/1.2

500

0.9

500

1/3
1/2

6.4
10.3

515
730

3.3
4.8

515
730

2.7
3.4

530
730

2.6/1.3
3.6/1.8

530
730

1.1
1.3

530
730

3/4
1

12.8
15.2

1000
1210

6.5
7.7

1000
1210

4.1
4.9

970
1230

3.8/1.9
4.8/2.4

970
1230

1.5
1.9

970
1230

1-1/2
2

16.8
-

1690
-

8.5
-

1690
-

6.5
8.6

1630
2080

6.2/3.1
7.6/3.8

1630
2080

2.3
2.7

1630
2080

➀ Permanent split capacitor motors on models PSH130 through PSH340.
➁ Split phase motors for 1/4 through 3/4 hp motors. Capacitor start motors are 1 through 2 hp.
➂ Whenever 230V/1φ or 230V/3φ power is used, it is necessary to specify 230V/25V controls. Whenever 460V/3φ power is used, it is necessary to specify 230V/25V
controls and in addition, a 460V/230V 75VA step-down transformer (by others) is required. On 230V/3φ or 460V/3φ systems, the motor starter coil voltage (motor
starter by others) must be 230V. For 200V/3φ systems, the motor starter coil voltage (motor starter by others) must be 200V.
➃ All motors used are produced, rated and tested by reputable manufacturers in accordance with NEMA standards and carry the standard warranty of both the motor
manufacturer and Modine. All motors are totally enclosed. Single phase motors have built-in thermal overload protection.
➄ 575V motor available on blower units only.

18

Heater Parts from ACF Greenhouses

MOTOR DATA
Blower Drive Numbers
Sheave
Drive
No.
13
14
15
16
18
21
22
23

Blower Sheave
Belt No.
Browning Pitch Dia.
A43
8
A44
8
A44
9
A48
8
A49
9
A52
13
A53
11
A56
11

Bore
0.750
0.750
0.750
1.000
1.000
0.750
1.000
1.000

Motor
Min/Max
Pitch Dia.
1.9/2.9
1.9/2.9
1.9/2.9
1.9/2.9
1.9/2.9
1.9/2.9
1.9/2.9
3.4/4.4

Blower Sheave
Bore
0.500
0.625
0.500
0.625
0.625
0.500
0.625
0.625

Sheave
Drive
No.
25
32
57
165
166
167
177
178

Belt No.
Browning
A58
A55
A46
A53
A45
A47
A56
A48

Pitch Dia.
13
11
10
13
9
10
11
8

Motor

Bore
1.000
1.000
0.750
0.750
0.750
0.750
1.000
1.000

Min/Max
Pitch Dia.
1.9/2.9
3.4/4.4
1.9/2.9
1.9/2.9
1.9/2.9
1.9/2.9
3.4/4.4
1.9/2.9

Bore
0.625
0.875
0.500
0.625
0.625
0.625
0.875
0.875

CONTROL OPTIONS
Propeller and Blower Unit Heaters — PSH and BSH Models ➀ ➁ ➂ ➃
Control System Description
Single-Stage, Intermittent Pilot Ignition, 100% Shut-off with Continuous Retry —
Utilizes a single-stage combination gas control and an ignition control (continuous retry).
Pilot is automatically lit on call for heat.

➀
➁
➂
➃

Shaded prices - Standard units in stock; all others 2-3 weeks delivery.
Stainless steel burner option - see page 5 for part number and list price.
CGA approved 460V and 575V aviailable on blower units only.
575V motor available on blower units only.

Control Operating Sequence
Upon a call for heat from the thermostat, power is supplied to
the time delay relay for the power exhauster motor. The power
exhauster motor will come on in 1 to 25 seconds. In 45 to 90
seconds (from the call for heat) the ignition control will be turned
on. This delay allows for a pre-purge of the unit and the vent.
Sparking will start at the igniter at the same time the first
operator of the combination gas control opens to allow ga to
flow to the pilot burner. The pilot flame should light and be
sensed (proven) in a few seconds. As soon as the pilot flame is
sensed the sparking will stop and the second operator of the
combination gas control will open to allow gas to flow to the
main burner. In 10 to 45 seconds from the time the ignition
control was energized (1 to 2 minutes from the call for heat from
the thermostat) the fan motor will start.

Control
Code
No.

Service
Voltage

Thermostat
Voltage

Type of
Gas

30
31
➂ 32
➂ ➃ 33
85
86
➂ 93
➂ ➃ 94

115V
200-208/230V
460V
575V
115V
200-208/230V
460v
575v

25V
25V
25V
25V
25V
25V
25V
25V

natural
natural
natural
natural
propane
propane
propane
propane

ignition control is turned on it will attempt to light the pilot
flame for 70 seconds. If the pilot flame is not sensed for any
reason, the ignition control will wait for a predetermined time
with the combination gas control closed and no sparking.
After the pre-determined time lapses, the cycle will begin
again. The time that lapses between cycles is at
preprogrammed intervals (approximately 6 minutes). This will
continue indefinitely until the pilot flame is sensed or until
power is interrupted to the ignition control.
When the thermostat has been satisfied, power is turned off
to the ignition control (and therefore the combination gas
control), so both the main gas and pilot gas are turned off.
The fan motor will continue to operate for 20 to 60 seconds to
allow the heat exchanger to cool down. Finally, the power
exhauster motor is turned off 1 to 2 minutes after the
thermostat is satisfied. This allows the products of
combustion to be cleared from the unit and the vent. The
system is now ready for another call for heat from the thermostat.

On units with control codes 08 and 09, when the ignition control
is turned on it will attempt to light the pilot flame. If the pilot
flame is not sensed for any reason, the sparking will continue
indefinitely until the pilot flame is sensed or until power is
interrupted to the ignition control. On units with control codes
30, 31, 85 and 86, the sequence is similar, except that when the

19

Heater Parts from ACF Greenhouses

PERFORMANCE DATA
30°, 60° and 90° Downward Deflector Hoods - Propeller PSH Models
Mounting
Height to
Bottom
of Heater
Model
8'
10'
12'
14'
16'
18'
20'
22'
Mounting
Height to
Bottom
of Heater
Model
8'
10'
12'
14'
16'
18'
20'
22'
Mounting
Height to
Bottom
of Heater
Model
8'
10'
12'
14'
16'
18'
20'
22'
24'
➀

30°
Downward
Deflector
Hood
PSH 130
X
Y
Z
21 44 60
20 43 59
19 42 58
18 41 56
16 38 53
14 36 50
21 31 44
8
24 35
60°
Downward
Deflector
Hood
PSH 130
X
Y
Z
0
47
65
0
46
63
0
44
60
0
42
57
0
39
53
0
35
48
0
29
40
0
16
23
90°
Downward
Deflector
Hood
PSH 130
S
56
50
46
43
40
38
36
34

PSH 150
X
Y
Z
19 39 53
17 38 52
16 37 50
15 35 48
13 32 44
10 28 39
8 23 33
—

Propeller Models➀ (See Figures A and B)
PSH 170
PSH 225
PSH 280
X
Y
Z
X
Y
Z
X
Y
Z
17 37 50
26 53 73
21 43 59
16 35 48
25 53 72
20 42 58
15 34 46
24 52 70
18 41 56
13 32 44
23 50 69
17 39 65
11 28 39
21 49 67
15 37 51
7 20 29
20 47 64
14 34 47
—
18 44 61
11 29 41
—
16 41 58
8 23 34

PSH 340
X
Y
Z
22 46 62
21 56 61
10 43 59
18 42 57
17 40 55
15 37 52
13 33 47
8 24 36

PSH 150
X
Y
Z
0 42 57
0 40 55
0 38 52
0 35 48
0 31 43
0 25 35
0 19 27
—

Propeller Models➀ (See Figures A and B)
PSH 170
PSH 225
PSH 280
X
Y
Z
X
Y
Z
X
Y
Z
0 39 54
0 57 78
0 46 63
0 37 50
0 56 76
0 44 61
0 34 47
0 54 74
0 43 58
0 31 43
0 52 72
0 40 55
0 27 37
0 50 69
0 37 51
0 17 23
0 47 65
0 33 45
—
0 44 60
0 26 36
—
0 39 54
0 19 26

PSH 340
X
Y
Z
0 49 66
0 47 64
0 45 62
0 43 59
0 40 55
0 36 50
0 31 43
0 21 29

Propeller Models➀ (See Figures C and D)
PSH 170
PSH 225
PSH 280
S
S
S
46
77
59
41
69
53
37
63
48
35
58
45
32
54
42
31
51
40
29
49
38
28
46
36
45
34

PSH 340
S
65
59
53
50
46
44
42
40
38

PSH 150
S
50
45
41
38
35
33
32
30

Data based on units fired at full input rate and with an entering air temperature of 80° F.

30° and 60° Deflector Hoods — Propeller and Blower Models
Figure A

Figure B — Throw/Floor Coverage
Note:
O-X = Feet from heater to start of floor coverage.
O-Y = Feet to end of floor coverage.
O-Z = Feet to end of throw.
30 DOWNTURN NOZZLE
60 DOWNTURN NOZZLE
30
60

MOUNTING
HEIGHT

30° Hood

60° Hood

X

60 NOZZLE

X

Y

Z
30 NOZZLE

Y
Z

20

Heater Parts from ACF Greenhouses

PERFORMANCE DATA
30°, 60° and 90° Downward Deflector Hoods - Propeller BSH Models
Mounting
Height to
Bottom
of Heater
Model
8'
10'
12'
14'
16'
18'
20'
Mounting
Height to
Bottom
of Heater
Model
8'
10'
12'
14'
16'
18'
20'
Mounting
Height to
Bottom
of Heater
Model
8'
10'
12'
14'
16'
18'
20'
22'
24'
26
28'
➀

X
11
9
7
5

X
0
0
0
0

30°
Downward
Deflector
Hood
BSH 130
Y
Z
25
34
22
31
19
26
15
21
—
—
—
60°
Downward
Deflector
Hood
BSH 130
Y
Z
25
35
22
30
17
23
10
14
—
—
—
90°
Downward
Deflector
Hood
BSH 130
S
26
25
24
23
22
21
20
—
—
—
—

A and B)
BSH 280
X
Y
Z
16 35 48
15 34 44
14 32 44
12 29 41
10 25 36
8 22 31
—

BSH 340
X
Y
Z
17 37 50
15 34 48
15 34 46
13 23 44
11 28 40
10 26 36
7 20 29

Propeller Models➀ (See Figures A and B)
BSH 150
BSH 170
BSH 225
X
Y
Z
X
Y
Z
X
Y
Z
0 22 30
0 26 36
0 33 45
0 18 25
0 23 32
0 31 42
0
9 13
0 18 25
0 27 38
—
0 13 19
0 23 32
—
—
0 12 17
—
—
—
—
—
—

BSH 280
X
Y
Z
0 37 50
0 35 48
0 32 44
0 29 40
0 23 32
0 18 26
0 13 19

BSH 340
X
Y
Z
0 39 53
0 37 51
0 35 47
0 31 43
0 27 37
0 17 24
0 14 19

Propeller Models➀ (See Figures C and D)
BSH 150
BSH 170
BSH 225
S
S
S
23
28
32
22
27
31
21
26
30
20
25
29
19
24
28
18
23
27
—
22
26
—
21
25
—
—
24
—
—
—
—
—
—

BSH 280
S
35
34
33
32
31
30
29
28
27
26
26

BSH 340
S
37
36
35
34
33
32
31
30
29
28
27

BSH 150
X
Y
Z
9 22 30
8 19 26
6 16 23
4 13 19
—
—
—

Propeller Models➀ (See Figures
BSH 170
BSH 225
X
Y
Z
X
Y
Z
11 25 35
14 31 43
10 23 32
13 30 41
8 20 28
12 28 38
6 16 23
10 24 34
—
8 22 31
—
6 18 26
—
—

Data based on units fired at full input rate and with an entering air temperature of 80° F.

90° Downward Deflector Hood — Propeller and Blower Models
Figure C

Figure D

H

90° Hood
S

S

21

Heater Parts from ACF Greenhouses

PERFORMANCE DATA
Nozzles - Performance
A choice of four air discharge
nozzles accommodate various
heat throw patterns illustrated.
Equipped with adjustable louver
blades, nozzles are fabricated
from galvanized steel and are
offered either unpainted or
painted to match the finish of the
blower unit heaters. Nozzles are
flanged for easy attachment over
the air discharge opening of the
blower unit heater.

90° Vertical Nozzle

H

H

T
S

S

S

40° Downward Nozzle

H

5-Way Nozzle

T

H
S

T

S
S
40° Splitter Nozzle

Nozzle Performance Mounting Height, Heat Throw, Heat Spread (in feet)
Nozzle
Type
40°
Downward
Nozzle
90°
Vertical Nozzle
40°
Splitter
Nozzle
5-Way
Nozzle

✝ Max. Mounting Ht. (ft.)
Heat Throw (ft.)
Heat Spread (ft.)
✝ Max. Mounting Ht. (ft.)
Heat Spread (ft.)
✝ Max. Mounting Ht. (ft.)
Heat Throw (ft.)
Heat Spread (ft.)
✝ Max. Mounting Ht. (ft.)
Heat Spread (ft.)

BSH 130

BSH 150

20
58
20
20
20
18
45
90
16
22

21
62
21
18
18
18
45
90
16
22

Model Number
BSH 170
BSH 225
24
71
24
21
21
20
51
102
18
25

24
71
24
24
24
21
53
106
20
27

BSH 280
26
79
26
26
26
25
62
123
19
26

BSH 340
28
83
28
27
27
28
69
137
23
31

The above table is based on an inlet air temperature of 70°F and an air temperature rise of 55°F. Air deflectors on 40° and 90° discharge nozzles set perpendicular to the
face of the air discharge opening. On 5-way nozzles, bottom air deflectors set perpendicular to floor, all other deflectors at 30° to floor. Static pressure measured at 0.1 W.
C. for 90° nozzle 0.2 W. C. for 40° downward and 5-way nozzle and 0.3 W. C. for 40° splitter nozzle. Outlet velocities are approximately 1850 fpm for the 40° nozzle, 900
fpm for the 90° nozzle and 900 fpm for 5-way nozzle. For motor size, drive and blower rpm refer to pages 10 and 11. Mounting Height measured from bottom of unit.

22

Heater Parts from ACF Greenhouses

DIMENSIONAL DATA
A
3

3

/4"

/4"

B

B

D

D

C
C
40° Downward Nozzle

40° Splitter Nozzle

A

A
3

3

/4"

/4"

B
B

D

D

C
C
40° Vertical Nozzle

5-Way Nozzle

Dimensions (in feet)
Nozzle

Dimension

Type

Symbol

BSH 130

BSH 150

BSH 170

BSH 225

BSH 280

BSH 340

A
B
C
D
A
B
C
D

21-1/16
20
25
4
21-1/16
20
23
8

23-3/16
24
30
4
23-3/16
24
29
10

23-3/16
24
30
4
23-3/16
24
29
10

26-3/16
24
30
6
26-3/16
24
30
10

31-1/8
24
36
11
31-1/8
24
34
14

37-1/2
24
36
11
37-1/2
24
34
14

A
B

21-1/16
20

23-3/16
24

23-3/16
24

26-3/16
24

31-1/8
24

37-1/2
24

C
D

33-1/2
11

39
12

39
12

40
14

46
19

47
20-1/2

A
B
C
D

21
20
27
14

23-3/16
24
29
15

23-3/16
24
29
15

26-3/16
24
32
16

31-1/8
24
37
18

37-1/2
24
43-1/2
18

40°
Downward
Nozzle

90°
Vertical
Nozzle

40°
Splitter
Nozzle

5-Way
Nozzle

Model Number

23

Heater Parts from ACF Greenhouses

SERVICE INSTRUCTIONS — SAFETY DEVICES
Figure 13
Rear View Propeller Type Unit
PRESSURE SWITCH
SENSING TUBES

JUNCTION BOX

TERMINAL
BOARD

PRESSURE
SWITCH

FAN
MOTOR
SIDE PANEL
MOUNTING
SCREWS

SIGHT GLASS

GAS SUPPLY
CONNECTION
ACCESS PANEL

Limit Control (Overheat Switch)
The limit control, mounted on the left inner side panel (when
facing front of unit), will shut off the gas supply to the main
burner in the event of overheating. It is a single pole single
throw switch. The contacts open to shut the combination gas
control off in the event the unit should overheat. This limit
control should operate only when something is seriously wrong
with the unit. Anytime this control operates, correct the difficulty
immediately or serious damage may result. If the limit control
cuts off the gas supply during normal operation:
1. See that front louvers are open and that there are not any
obstructions in the air inlet or outlet.

5. On propeller units check fan speed against speed on motor
nameplate. On blower units check blower speed against
Performance Tables on pages 14 and 15; check for
restrictions in ducts and for dirty filters.
6. Check to make sur the venting system and combustion air
piping is not damaged or blocked. Also check to be sure
unit is venting normally.
7. Clean heat exchanger tubes inside and out if necessary.
8. If items 1-7 do not solve the problem, check limit control
and replace if necessary. The control is accessible by
removing the left outer side panel, held in place by screws
at the rear of the unit.

2. Check actual input to unit against rated input.
3. Check to be sure fan motor is operating.
4. On propeller unit check that fan is not loose on motor shaft.
On blower unit check belt and sheave for tightness or
damage.

24

Heater Parts from ACF Greenhouses

SERVICE INSTRUCTIONS — GENERAL
Only people trained and familiar with the operation of unit
heaters and their controls should service this unit.

c. Primary air shutters (when used).

General Maintenance

e. Fan blades.

d. Clean heat exchanger tubes from bottom with stiff
brush after removing burner. (Do not use wire brush.)

1. Service air moving components annually.

To Remove Main Burner

a. On propeller units this includes checking motor for
lubrication if motor is not there permanently lubricated
type and check fan for fit on motor shaft and for
damage to blades.

1. Turn off electricity and gas to unit.

b. On blower units this should include:

3. Remove all fastening screws holding hinged bottom pan in
place and lower bottom pan (see Figure 2).

(1) checking motor and blower bearings for lubrication
(2) checking belt and sheaves for proper alignment and
adjustment
(3) checking cleanliness of blower wheel and filters
2. Keep unit free from dust, dirt, grease and foreign matter,
paying particular attention to:
a. Combustion air inlet terminal.
b. Main burner ports, pilot burner, an main burner orifices
(avoid use of hard, sharp instruments capable of
damaging surfaces, for cleaning these ports). If air
pressure is available, use air hose to blow dirt and
other foreign matter from within the burner. Also main
burner orifices should be checked for blockage due to
spider webs, etc.

2. Remove access panel (see Figure 13).

4. Disconnect pilot tubing and ignition cable from the
combination gas control and ignition control.
5. Remove the two burner retaining pins holding the burner in
place. The burner can then be easily lowered from the unit.
In replacing the burner, be certain that the slots at the front
of the burner are located properly on their shoulder rivets
and that the burner retaining pins are put back into their
proper locations.
Replace bottom pan and access panel, making sure a good
tight seal is achieved along he entire perimeter of both
panels.

TROUBLESHOOTING GUIDE
Figure 15
Air Shutter Adjustment, Propane Gas

Figure 14
Manifold Adjustment

MANIFOLD
IGNITION CONTROL

PRIMARY
AIR SHUTTER

MAIN
BURNER ORIFICE

IGNITION
CABLE

COMBUSTION
AIR INLET COLLAR
PILOT AND
IGNITOR
ASSEMBLY

MIXER
TUBES
PILOT
TUBE

MIXER
TUBES

MANIFOLD
MOUNTING
SCREW

MAIN BURNER
ORIFICE
HINGED BOTTOM PAN

Figure 16
Lifting Flame Condition

MANIFOLD

Combustion Diagnosis
To realize full gas heating value requires periodic inspections
with proper combustion control corrections as outlined and
illustrated here.
1. Lifting Flames. Lifting flames rise unevenly above the
burner port and may occur on few or all the ports.
Sometimes the flames drop and lift intermittently. Lifting can
be eliminated by reducing primary air. If flame cannot be
adjusted properly, check input rate to heater and manifold
gas pressure; reduce if necessary. Check the main burner
orifice size with those listed in Table 5 to be sure the unit is
not operating over rated input.
25

Heater Parts from ACF Greenhouses

TROUBLESHOOTING GUIDE
2. Yellow Tipping. Yellow tipping of a normally blue flame is
caused by insufficient primary air, and indicates incomplete
combustion producing carbon monoxide ethylene, aldehyde,
and fee carbon (soot). A dirty orifice or one that is out of
line, can also reduce primary air and cause yellow tipping.
Check main burner orifices, clean, realign, or replace if
necessary. With propane gas, some yellow tipping is always
present, but is not objectionable.
3. Flashback. Flashback occurs when air-gas mixture ignites
inside the mixer tube to burn near the orifice. Flashback on
ignition or during burner operation usually can be eliminated
by reducing primary air. The burner may also be operating
below its rated capacity. Check input rate and adjust to
correct value by increasing orifice size or manifold gas
pressure.

dust may be blocking the heat exchanger. Check and clear
any blockage. Adjust primary air to get rid of yellow tipping
that may produce soot to block heat exchanger. Make sure
combustion air piping is not blocked.

Intermittent Pilot Ignition Systems

CAUTION
Do not attempt to reuse an ignition control which has been
Replace defective control.

1. Pilot will not light or stay lit.

Figure 17
Wavering Flame or Misalignment

GOOD

Possible Cause
1a. No spark at ignitor.

1a. Check connections. Check for proper
spark gap, cracked or broken
electrode ceramic, blown controller
fuse or brittle, cracked or loose high
tension cable. Check power
exhauster pressure switch. Replace if
defective.

1b. Defective flame
sensor or loose
connections to
flame sensor.

1b. Check mili-amps of sensor. Tighten
loose connections. Replace flame
sensor if necessary.

1c. Pilot valve electrical
connections loose.

1c. Tighten connections.

1d. Defective pilot valve.

1d. Replace.

1e. Poor ground
connections.

1e. Check grounding means.

1f. No power from
control transformer.

1f. Check transformer voltage on
secondary side for 25v.

1g. Spark not located in
pilot gas stream.

1g. Correct or replace pilot.

1h. Dirty or plugged
pilot orifice.

1h. Clean or replace.

1i.

Pilot line kinked
or obstructed.

1i.

Correct or replace pilot line.

1j.

Pilot flame too low.

1j.

Check pilot flame and adjust per
manufacturer’s recommendations.

BAD

4. Wavering Flames. Drafts across burners may cause flames
to appear unstable. Wavering flames can lead to incomplete
combustion if flames impinge on cool surfaces. Wavering
can be caused by air drafts into the burner compartment or
by misalignment of the burner. Draft-blown flames may
indicate a cracked heat exchanger.

Figure 18
Floating Flame Condition

Possible Remedy

1k. Flame sensor out
of position.

1k. Reposition.

1l.

1l.

Defective ignition
controller.

Replace.

5. Floating Flames. Floating flames are long — do not have
well-defined cones, roll around in the combustion chamber,
sometimes completely off the main burner ports. Usually an
aldehyde odor is present to indicate incomplete combustion.
If combustion air supply is reduced too far, burner flames
will float. Often the pilot flame goes out. Lack of combustion
air causes burner flames to float. The unit may be overfired
so its flue outlet area may be too small for the increased
firing rate. Check input rate and reduce if necessary. Soot or
26

Heater Parts from ACF Greenhouses

TROUBLESHOOTING GUIDE
2. Pilot lights, main burner will not light.
Possible Cause

3. Burner shuts down before thermostat is satisfied.

Possible Remedy

Possible Cause

2a. Gas valve in off
off position.

2a. Turn to on position.

2b. System in lock-out
mode.

2b. Reset system.

2c. Cracked or broken
sensor ceramic.

2c. Replace sensor.

2d. Defective or loose
connections to flame
sensor or flame
sensor lead.

2d. Correct or replace.

2e. Incorrect gas
pressure.

2e. Check and adjust if necessary to
manufacturer’s recommendations
and replace if necessary.

2f. Insufficient current
signal from flame
sensor.

2f. Check current according to
manufacturer’s recommendations
and replace if necessary.

2g. Incorrect or loose
wiring.

Possible Remedy

3a. Flame sensing
circuit failure.

3a. Check flame sensing rod, sensor
ceramic, sensor lead and
connections for damage or loss of
continuity. Replace defective
elements.

3b. Soot on sensing rod.

3b. Clean off soot and adjust pilot to
smaller size.

3c. Blockage in heat
exchanger.

3c. Clean heat exchanger.
Determine cause and correct.

3d. Blockage in main
burner orifice.

3d. Clean or replace orifice.

4. Burner fails to shut off after thermostat is satisfied.
Possible Cause

Possible Remedy
4a. Check thermostat and anticipator
setting. Replace if defective.

2g. Check wiring.

4a. Faulty thermostat
or improper heat
anticipator setting.

2h. Check grounding means.

4b. Defective ignition
controller.

4b. Replace.

2h. Poor ground to
ignition control.
2i.

No power to ignition
controller or gas
valve.

2i.

Loose limit control
connections or
defective unit.

2j.

2j.

4c. Defective gas control. 4c. Replace.
Check voltage to controller and gas
valve.
Check connections.
Replace limit control if necessary.

2k. Defective or plugged
gas valve regulator.

2k. Inspect gas valve regulator.
Replace if necessary.

2l.

2l.

Defective thermostat
or thermostat out
of calibration.

Calibrate thermostat or replace if
necessary.

For Service . . .
If a qualified service person cannot solve the problem, consult
your local gas company or local Modine representative.
When servicing, repairing or replacing parts on these units
always give the complete Model Number (which includes power
code/control code) and Serial Number from the unit rating plate.

2m. Thermostat heat
anticipator
incorrectly set.

2m. Check anticipator setting and correct
if necessary.

RATING PLATE IDENTIFICATION

2n. Defective ignition
controller.

2n. Replace.

When servicing, repairing or replacing parts on these units
always give the complete Model Number, Power Code Number,
Control Code Number and Serial Number from the unit rating
plate. The sample below shows what these numbers mean.

MODEL NUMBER DESIGNATIONS

SERIAL NUMBER DESIGNATIONS

P S H 28 0 A V 01 3 0
P - Propeller Unit
B - Blower Unit

S - Separated
Combustion
H - High Efficiency

01 01 20 1 01 97 100 0

Control Code Type
30 - 115v/25v intermittent
pilot ignition, 100%
Shut-Off with continuous
retry, natural gas
31 - 230v/25v intermittent
pilot ignition, 100%
Shut-Off with continuous
retry, natural gas
etc.

MBH Input
150 - 150,000 Btu/hr input
170 - 170,000 Btu/hr input
225 - 225,000 Btu/hr input
etc.

Power Code
01 - 115v/60Hz/1φ
02 - 230v/60Hz/1φ
etc.

Heat Exchanger Type
A - Aluminized
S - Stainless Steel

F - Unit equipped with
intermittent pilot ignition
V - Unit equipped with
intermittent pilot ignition
and concentric vent
compatible.

Motor Vendor Code
01 - Century
05 - Universal
etc.

Sequence
Number

Year of Manufacture
96 - 1996
97 - 1997
etc.

Fan or Blower
Vendor Code
01 - Revcor
08 - Brookside
etc.
Series Identity Number
Identifies which series of controls
were furnished on the unit.

Week of Manufacture
01 - 1st week of year
26 - 26th week of year
etc.

RATING PLATE

SERIAL NUMBER
01122010195

MODEL NUMBER
PSH280AF

Power Code

Control Code

01

30

27

Heater Parts from ACF Greenhouses

Seller warrants its products to be free from defects in material and workmanship,
EXCLUSIVE, HOWEVER, of failures attributable to the use of materials substituted
under emergency conditions for materials normally employed. This warranty covers
replacement of any parts furnished from the factory of Seller, but does not cover
labor of any kind and materials not furnished by Seller, or any charges for any
such labor or materials, whether such labor, materials or charges thereon are due
to replacement of parts, adjustments, repairs, or any other work done. This
warranty does not apply to any equipment which shall have been repaired or
altered outside the factory of Seller in any way so as, in the judgment of Seller, to
affect its stability, nor which has been subjected to misuse, negligence, or
operating conditions in excess of those for which such equipment was designed.
This warranty does not cover the effects of physical or chemical properties of water
or steam or other liquids or gases used in the equipment.
BUYER AGREES THAT SELLER’S WARRANTY OF ITS PRODUCTS TO BE
FREE FROM DEFECT IN MATERIAL AND WORKMANSHIP, AS LIMITED
HEREIN, SHALL BE IN LIEU OF AND EXCLUSIVE OF ALL OTHER
WARRANTIES, EITHER EXPRESS OR IMPLIED, WHETHER ARISING FROM
LAW, COURSE OF DEALING, USAGE OF TRADE, OR OTHERWISE, THERE
ARE NO OTHER WARRANTIES, INCLUDING WARRANTY OF
MERCHANTABILITY OR FITNESS FOR PURPOSE, WHICH EXTEND BEYOND
THE PRODUCT DESCRIPTION CONFIRMED BY BUYER AND SELLER AS OF
THE DATE OF FINAL AGREEMENT.
This warranty is void if the input to the product exceeds the rated input as indicated
on the product serial plate by more than 5% on gas-fired and oil-fired units, or if
the product in the judgment of SELLER has been installed in a corrosive
atmosphere, or subjected to corrosive fluids or gases, been subjected to misuse,
negligence, accident, excessive thermal shock, excessive humidity, physical
damage, impact, abrasion, unauthorized alterations, or operation contrary to
SELLER’S printed instructions, or if the serial number has been altered, defaced or
removed.
Heat Exchangers
For Seller’s non-separated combustion Gas-Fired Unit Heaters
BUYER’S REMEDY FOR BREACH OF WARRANTY, EXCLUSIVE OF ALL
OTHER REMEDIES PROVIDED BY LAW, IS LIMITED TO REPAIR OR
REPLACEMENT AT THE FACTORY OF SELLER, ANY HEAT EXCHANGER
WHICH SHALL, WITHIN TEN YEARS FROM DATE OF FIRST BENEFICIAL
USE BY BUYER OR ANY OTHER USER, WITHIN TEN YEARS FROM DATE
OF RESALE BY BUYER OR ANY OTHER USER, WITHIN TEN YEARS FROM
DATE OF RESALE BY BUYER IN ANY UNCHANGED CONDITION, OR
WITHIN ONE HUNDRED TWENTY-SIX MONTHS FROM DATE OF
SHIPMENT FROM SELLER, WHICHEVER OCCURS FIRST, BE RETURNED
TO SELLER WITH TRANSPORTATION CHARGES PREPAID AND WHICH
THE EXAMINATION OF SELLER SHALL DISCLOSE TO HAVE BEEN
DEFECTIVE; EXCEPT THAT WHEN THE PRODUCT IS TO BE USED BY
BUYER AS A COMPONENT PART OF EQUIPMENT MANUFACTURED BY
BUYER, BUYER’S REMEDY FOR BREACH, AS LIMITED HEREIN, SHALL
BE LIMITED TO ONE YEAR FROM DATE OF SHIPMENT FROM SELLER.
FOR GAS-FIRED PRODUCTS INSTALLED IN HIGH HUMIDITY
APPLICATIONS AND UTILIZING STAINLESS STEEL HEAT EXCHANGERS,
BUYER’S REMEDY FOR BREACH, AS LIMITED HEREIN, SHALL BE
LIMITED TO TEN YEARS FROM DATE OF SHIPMENT FROM SELLER.
For Seller's Low Intensity Gas-Fired Infrared Heaters
BUYER'S REMEDY FOR BREACH OF WARRANTY, EXCLUSIVE OF ALL
OTHER REMEDIES PROVIDED BY LAW, IS LIMITED TO REPAIR OR
REPLACEMENT AT THE FACTORY OF SELLER, ANY HEAT EXCHANGER
WHICH SHALL, WITHIN FIVE YEARS FROM DATE OF FIRST BENEFICIAL
USE BY BUYER OR ANY OTHER USER, WITHIN FIVE YEARS FROM DATE
OF RESALE BY BUYER OR ANY OTHER USER, WITHIN FIVE YEARS
FROM DATE OF RESALE BY BUYER IN ANY UNCHANGED CONDITION,
OR WITHIN 66 MONTHS FROM DATE OF SHIPMENT FROM SELLER,
WHICHEVER OCCURS FIRST, BE RETURNED TO SELLER WITH
TRANSPORTATION CHARGES PREPAID AND WHICH THE EXAMINATION
OF SELLER SHALL DISCLOSE TO HAVE BEEN DEFECTIVE; EXCEPT THAT
WHEN THE PRODUCT IS TO BE USED BY BUYER AS A COMPONENT
PART OF EQUIPMENT MANUFACTURED BY BUYER, BUYER'S REMEDY
FOR BREACH, AS LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR
FROM DATE OF SHIPMENT FROM SELLER.
Heat Exchanger (Condensers) for all Seller’s products except non-separated
combustion Gas-Fired Unit Heaters and Infrared Heaters, all Burners except
Infrared Heaters, and Sheet Metal for all Seller's products
BUYER’S REMEDY FOR BREACH OF WARRANTY, EXCLUSIVE OF ALL
OTHER REMEDIES PROVIDED BY LAW, IS LIMITED TO REPAIR OR
REPLACEMENT AT THE FACTORY OF SELLER, ANY HEAT EXCHANGER
(CONDENSER) OR BURNER WHICH SHALL, WITHIN ONE YEAR FROM
DATE OF FIRST BENEFICIAL USE BY BUYER OR ANY OTHER USER,
WITHIN ONE YEAR FROM DATE OF RESALE BY BUYER IN ANY

UNCHANGED CONDITION, OR WITHIN EIGHTEEN MONTHS FROM DATE
OF SHIPMENT FROM SELLER, WHICHEVER OCCURS FIRST, BE
RETURNED TO SELLER WITH TRANSPORTATION CHARGES PREPAID
AND WHICH THE EXAMINATION OF SELLER SHALL DISCLOSE TO HAVE
BEEN DEFECTIVE; EXCEPT THAT WHEN THE PRODUCT IS TO BE USED
BY BUYER AS A COMPONENT PART OF EQUIPMENT MANUFACTURED
BY BUYER, BUYER’S REMEDY FOR BREACH, AS LIMITED HEREIN,
SHALL BE LIMITED TO ONE YEAR FROM DATE OF SHIPMENT FROM
SELLER.
Burners
For Seller's Low Intensity Gas-Fired Infrared Heaters
BUYER'S REMEDY FOR BREACH OF WARRANTY, EXCLUSIVE OF ALL
OTHER REMEDIES PROVIDED BY LAW, IS LIMITED TO REPAIR OR
REPLACEMENT AT THE FACTORY OF SELLER, ANY BURNER WHICH
SHALL, WITHIN TWO YEARS FROM DATE OF FIRST BENEFICIAL USE BY
BUYER OR ANY OTHER USER, WITHIN TWO YEARS FROM DATE OF
RESALE BY BUYER IN ANY UNCHANGED CONDITION, OR WITHIN 30
MONTHS FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER
OCCURS FIRST, BE RETURNED TO SELLER WITH TRANSPORTATION
CHARGES PREPAID AND WHICH THE EXAMINATION OF SELLER SHALL
DISCLOSE TO HAVE BEEN DEFECTIVE; EXCEPT THAT WHEN THE
PRODUCT IS TO BE USED BY BUYER AS A COMPONENT PART OF
EQUIPMENT MANUFACTURED BY BUYER, BUYER'S REMEDY FOR
BREACH, AS LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR FROM
DATE OF SHIPMENT FROM SELLER.
For Seller's High Intensity Gas-Fired Infrared Heaters
BUYER'S REMEDY FOR BREACH OF WARRANTY, EXCLUSIVE OF ALL
OTHER REMEDIES PROVIDED BY LAW, IS LIMITED TO REPAIR OR
REPLACEMENT AT THE FACTORY OF SELLER, ANY BURNER WHICH
SHALL, WITHIN TEN YEARS FROM DATE OF FIRST BENEFICIAL USE BY
BUYER OR ANY OTHER USER, WITHIN TEN YEARS FROM DATE OF
RESALE BY BUYER IN ANY UNCHANGED CONDITION, OR WITHIN 126
MONTHS FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER
OCCURS FIRST, BE RETURNED TO SELLER WITH TRANSPORTATION
CHARGES PREPAID AND WHICH THE EXAMINATION OF SELLER SHALL
DISCLOSE TO HAVE BEEN DEFECTIVE; EXCEPT THAT WHEN THE
PRODUCT IS TO BE USED BY BUYER AS A COMPONENT PART OF
EQUIPMENT MANUFACTURED BY BUYER, BUYER'S REMEDY FOR
BREACH, AS LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR FROM
DATE OF SHIPMENT FROM SELLER.
All Other Components Excluding Heat Exchanger (Condenser), Burner, and
Sheet Metal
For all Seller's products except Direct-Fired Heaters and High Intensity
Gas-Fired Infrared Heaters
BUYER’S REMEDY FOR BREACH OF WARRANTY, EXCLUSIVE OF ALL
OTHER REMEDIES PROVIDED BY LAW, IS LIMITED TO REPAIR OR
REPLACEMENT AT THE FACTORY OF SELLER, ANY PART OR PARTS
WHICH SHALL, WITHIN TWO YEARS FROM DATE OF FIRST BENEFICIAL
USE BY BUYER OR ANY OTHER USER, WITHIN TWO YEARS FROM DATE
OF RESALE BY BUYER IN ANY UNCHANGED CONDITION, OR WITHIN
THIRTY MONTHS FROM DATE OF SHIPMENT FROM SELLER,
WHICHEVER OCCURS FIRST, BE RETURNED TO SELLER WITH
TRANSPORTATION CHARGES PREPAID AND WHICH THE EXAMINATION
OF SELLER SHALL DISCLOSE TO HAVE BEEN DEFECTIVE; EXCEPT THAT
WHEN THE PRODUCT IS TO BE USED BY BUYER AS A COMPONENT
PART OF EQUIPMENT MANUFACTURED BY BUYER, BUYER’S REMEDY
FOR BREACH, AS LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR
FROM DATE OF SHIPMENT FROM SELLER.
For Seller's Direct-Fired Heaters and High Intensity Gas-Fired Infrared Heaters
BUYER’S REMEDY FOR BREACH OF WARRANTY EXCLUSIVE OF ALL
OTHER REMEDIES PROVIDED BY LAW IS LIMITED TO REPAIR OR
REPLACEMENT AT THE SELLER’S OPTION ANY PART OR PARTS WHICH
SHALL WITHIN A PERIOD OF ONE YEAR FROM DATE OF FIRST
BENEFICIAL USE BY BUYER OR ANY OTHER USER, WITHIN ONE YEAR
FROM DATE OF RESALE BY BUYER IN ANY UNCHANGED CONDITION,
OR WITHIN 18 MONTHS FROM DATE OF SHIPMENT FROM SELLER,
WHICHEVER OCCURS FIRST, BE RETURNED TO SELLER WITH
TRANSPORTATION CHARGES PREPAID AND WHICH THE EXAMINATION
OF THE SELLER SHALL DISCLOSE TO HAVE BEEN DEFECTIVE.
BUYER AGREES THAT IN NO EVENT WILL SELLER BE LIABLE FOR COSTS
OF PROCESSING, LOST PROFITS, INJURY TO GOODWILL, OR ANY OTHER
CONSEQUENTIAL OR INCIDENTAL DAMAGES OF ANY KIND RESULTING
FROM THE ORDER OR USE OF ITS PRODUCT, WHETHER ARISING FROM
BREACH OF WARRANTY, NONCONFORMITY TO ORDERED SPECIFICATIONS,
DELAY IN DELIVERY, OR ANY LOSS SUSTAINED BY THE BUYER.

Modine Manufacturing Company has a continuous product improvement program;
it reserves the right to change design and specifications without notice.

© Modine Manufacturing Company 2002

Commercial HVAC&R Division
Modine Manufacturing Company
1221 Magnolia Avenue
Buena Vista, VA 24416
Phone: 1.800.828.4328 (HEAT)
FAX: 1.540.261.1903 (Service & Parts)
www.modine.com

11/02 - 1M Litho in USA

Heater Parts from ACF Greenhouses



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