Trane Sandp Unit Heaters Catalogue UH PRC001 EN

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Propeller Unit
Heaters/Unitary

8.0 to 705.6 MBh
Two Versatile Models - Various Sizes
Easy Installation

August 2007

UH-PRC001-EN

Introduction
The square, compact design of the
Model P and rectangular Model S
allow easy handling and installation.
In most cases, only one person is
needed to carry a unit.
What’s more, the Model P can be
stored standing on end. This means
several units can be loaded on a
single skid for moving from one point
to another.
Yet, the benefits of this compact
design go beyond ease of
installation. They continue with
attractive styling. The Model S unit’s
simple, clean-line symmetry and the
Model P unit’s classic modern shape
enhance any industrial facility.

© 2007 American Standard All rights reserved

UH-PRC001-EN

Contents
Model Number Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Features & Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Steam Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Hot Water Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Technical & Mounting Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Motor Characteristics Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

UH-PRC001-EN

3

Model Number Description
U

H

S

B

A

1

8

1

T

A

A

1

0

1

A

0

A

0

A

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

Service Model Number
Description
DIGIT 1,2,3 — PRODUCT TYPE
UHP
UHS

280
336
384
500
600
720

DIGIT 8—VOLTAGE

DIGIT 4— DEVELOPMENT
SEQUENCE

1
3

B

4
5
6
7

DIGIT 5, 6, 7—CAPACITY/COIL
TYPE
Hot Water Only "Serpentine Type
Coil" Model S
A08
A18
A25
A36

8,030 BTU/HR
18,400 BTU/HR
24,800 BTU/HR
35,900 BTU/HR

Steam or Hot Water "Header
Type Coil" Model S
018
024
036
048
060
072
084
096
108
120
132
144
156
180
204
240
280
300
360

18,000 BTU/HR
24,000 BTU/HR
36,000 BTU/HR
48,000 BTU/HR
60,000 BTU/HR
72,000 BTU/HR
84,000 BTU/HR
96,000 BTU/HR
108,000 BTU/HR
120,000 BTU/HR
132,000 BTU/HR
144,000 BTU/HR
156,000 BTU/HR
180,000 BTU/HR
204,000 BTU/HR
240,000 BTU/HR
280,000 BTU/HR
300,000 BTU/HR
360,000 BTU/HR

Steam or Hot Water Model P
042
064
080
102
122
146
166
202
252
4

280,000 BTU/HR
336,000 BTU/HR
384,000 BTU/HR
500,000 BTU/HR
600,000 BTU/HR
720,000 BTU/HR

42,000 BTU/HR
64,000 BTU/HR
80,000 BTU/HR
102,000 BTU/HR
122,000 BTU/HR
146,000 BTU/HR
166,000 BTU/HR
202,000 BTU/HR
252,000 BTU/HR

115/1/60
230/1/60 (115 V motor with
Transformer)
208/3/60
230/3/60
460/3/60
575/60/3 (Totally Enclosed)
(P only)

DIGIT 9 - MOTOR TYPE
E
T

Explosion Proof
Totally Enclosed

DIGIT 10- DESIGN SEQUENCE

DIGIT 16 - THERMOSTAT COVER
0
A

None
Locking Thermostat Cover

DIGIT 17 - Manual Starter
0
A

None
Manual Starter

DIGIT 18 - STEAM & HOT WATER
CONTROL
0
1
2
3
4
5
6
7

None
Strap on Hot Water Control
Steam Pressure Control
(Open on rise in pressure)
Steam Pressure Control
(Close on rise in pressure)
5.0 Amp Speed Control
Switch ( Capacities A08- 108
only)
Options 1 and 4
Options 2 and 4
Options 3 and 4

A

DIGIT 19 - VERTICAL LOUVER
DIGIT 11- TUBE MATERIAL
A
B

Copper
Steel (P only)

DIGIT 12- FAN GUARD
0
1
2

0
A
B
C

None
Vertical Louver
Louver Cone Diffuser (P only)
Louver Cone Diffuser w/
Coating (P only)

Standard Fan Guard
OSHA Fan Guard
Standard Fan Guard with
Shelf Mount

DIGIT 13 - SPECIAL COATING
0
A
B
C

No Special Coating
Phenolic Coating (Baked)
Epoxy
Epoxy Phenolic

DIGIT 14 - DISCONNECT SWITCH
0
1

None
Disconnect switch

DIGIT 15 - THERMOSTATS (LINE
VOLTAGE)
0
A
B

None
Light Duty TSTAT w/ subbase
Line Volts 8 Amps
Heavy Duty TSTAT w/
subbase
UH-PRC001-EN

Features & Benefits
Features & Benefits: Overview
Trane propeller unit heaters feature
the largest selection of standard
sizes from any line in the industry. In
fact, vertical Model P and horizontal
Model S unit heaters provide
enough ‘off-the-shelf’ selections to fit
almost any application.
The versatile two-in-one Model P is
available in 15 sizes with capacities
from 41.3 MBh to 705.6 MBh. The
companion standard and bypass
Model S is available in 23 sizes with
the capacities from 8.0 MBh up to
360 MBh. Both are designed for
durability, attractiveness and
compactness. These features
combined with economical
operation, give strategically sized
Trane unit heaters an edge
unmatched by any other
manufacturer.

Two Units in One – The
Versatile Model P
The Trane Model P can be quickly
field converted from standard to low
final temperature PL design simply
by removing the unit’s patented
knockout air ports. This unique
two-in-one design allows the
stocking wholesaler to cut
inventories in half and still meet
most customer application
requirements.

from 8.0 to 35.9 MBh and is ideal for
applications where clearance is
limited.

phase configuration, and threephase explosion-proof motors, see
the motor data-portion of the
Performance Data chapter for
availability.

Fan Guards
All models with standard (non
explosion-proof) single phase 115 or
230 volt motors utilize a wire fan
guard as a motor mount. (Optional
OSHA type guards are also
available.) All models with threephase or explosion-proof motors are
shelf-mounted. Standard type fan
guards can be added as an optional
accessory.

The Heavy-Duty Model S

Horizontal and Vertical Louvers

The versatile Header-Type unit can
be used with either steam or hot
water systems and is available in
capacities from 18.0 to 360.0 MBh.
Rugged cast brass headers and
mechanically bonded fins provide
reliable heating to suit a wide variety
of solutions.

Horizontal louvers are standard on
all models. Vertical louvers are an
optional accessory on all models.
Vertical louvers are installed on built
to order units or shipped loose for
field installation.

Thermostats
Two, line voltage wall thermostats
are in stock for immediate shipment.
All models operate in a 45-85 degree
F range (7-28 degree C). Standard
duty model with “fan control” and a
heavy duty model with “auto-offfan” switching are available. Other
models available on request. Plastic
tamperproof one size fits all
thermostat guards are also available.

Patented Trane louver cone diffusers
allow directional flexibility of heated
air.

Strap-on Water Control

Note:

Vertical louvers are available
for all Model S units to put
heat where it’s needed.

A SPDT strap-on type hot water
control with 100° to 240°F (38 to
116°C) rated at 10 amps at 120V is
also available. Control can be used
for direct or reverse acting
applications as a high or low limit.

Horizontal Unit Heaters
Construction and Features
The Space Saving Model S
The Side Connection type Model S
unit features functional styling in a
space-saving design. This hot water
unit heater is available in capacities

UH-PRC001-EN

Motors
115 volt, single speed motors are
standard. Most models can be
supplied with single phase,
explosion proof motors. For
standard motors in 230 volt or three5

Features & Benefits

Steam Pressure Control
SPST switch opens on a rise in
pressure. Control is automatically
reset, has a range of 0 to 15 PSIG (0
to 103 KPa) and has an adjustable
differential. Other actions, ranges,
circuits and manual reset models
are available on request.

Manual Starters
Single and three-phase models are
available. Standard models are
single-speed, toggle-operated,
NEMA Type 1 and are surfacemounted.

Wall Mounted Speed Controllers
Units up to S-108 and P-104 with
standard motors (115V) can be
operated at reduced speeds by
addition of optional speed controller.
Controller is 5 amps, pre-set at
factory for maximum and minimum
speeds, with intermediate speeds
infinitely controllable. All 1/3, 1/2 H.P.
and 230V motors operate only at
rated speed and CFM – See tables.

Vertical Unit Heaters
Construction and Features

2,580 E.D.R. (26.0 to 705 MBH) (2 PSI
w/60° E.A.T.). Hot water capacities
range from 18.9 to 519.4 MBH (200°
E.W.T./20° drop w/60° E.A.T.).

Construction
The unit casing is formed by two
square steel plates. The bottom plate
forms an orifice for air delivery. Air
ports are stamped in the top plate of
standard units for easy conversion of
low output units.

Fan
Aluminum blade fans are quiet,
factory balanced and sturdy for
standard or sparkproof applications.

Heating Element
Hot water-steam coils are rectangular
3 or 4-sided, one-pass, multiple
circuit, with aluminum fins
mechanically bonded to the tubes.
Standard coils are seamless copper
tubing. Coils tested at 375 psi under
water. Supply and return connections
are steel pipe. Standard coils have
.025 copper tubing suitable for use
on steam pressure to 75 psi or hot
water up to 225 psi or 325°F.

Motors
Standard motors are 115/60/1, totally
enclosed, with thermal overload
protection for all units through size P280. Standard motors for sizes 42, 64
and 80 are shaded pole, sleeve
bearing. The P-102 motor is
permanent split capacitor type with
sleeve bearings. Motor for unit sizes
122 through 280 are permanent split
capacitor types with permanently
lubricated ball bearings. Motors used
on unit sizes 336 through 720 are 230/
460/60/3, totally enclosed, with
permanently lubricated ball bearings.
Unit sizes smaller than 336 are also
available with 230/460/60/3 motors.
All motors fractional H.P. and integral
H.P., have Class “B” insulation. The
115/60/1 motors used as standard on
unit sizes 42 through 102 can be
operated at multiple speeds with the
addition of a solid-state control.
All units are available with 1140 rpm
explosion-proof motors.

Vertical projection unit heaters
provide heat where it is required in
commercial and industrial
applications. Mounted near the
ceiling, this unit provides air
circulation and reduces stratification,
without occupying otherwise usable
building space. Units can be
provided with an optional diffuser for
patterned discharge, or, without a
diffuser for higher velocity ‘spot’
heating near doorways and other
highloss areas.

Vertical units are available in fifteen
sizes for steam or hot water heating.
Steam capacities range from 140 to
6

Figure 1.

UH-PRC001-EN

Application Consideration
General Rules
In locating or spotting Trane
Propeller Unit Heaters – either the
Model S Horizontal or Model P
Projection Unit Heater – the
following general rules should be
considered.
1.

Spot units at points of greatest
heat loss. Blanket outside
doorways effectively and
provide ample coverage for
exposed window areas.

2.

Units, especially in the case of
the Model S Horizontal Unit
Heater, should be arranged to
blow toward or along exposed
walls, preferably striking the
wall at a slight angle so that the
heated air exerts a wiping effect
along the wall. Balance of units
required to supply Btu
requirements should be spaced
strategically in balance of the
area.

3.

Unit heaters should be arranged
to blow into open spaces such as
aisles and not directly at any
worker. An exception to this rule
involves the use of the Model P
Unit Heater equipped with the
Louver Cone Diffuser. This
combination can be used
effectively over closely spaced
bins or machines without regard
for open space. But not even the
Model P Unit Heater with Louver
Cone Diffuser should be in such
close proximity to the workers to
cause discomfort.

4.

The Trane solid-state speed
control will provide maximum
capacity flexibility and quieter
operation. Note that this speed
controller is available only on
selected models.

5.

Mounting heights and distance
of throw recommendations as
given elsewhere in this catalog
should be carefully observed.

6.

In the case of Model P Units,
they should be spotted so that
they will most effectively
prevent stratification of
excessively warm air at the
ceiling. By carefully observing
this rule, this type of unit may be

UH-PRC001-EN

used between seasons to tap
waste heat at the ceiling and
drive it down to occupied zones,
thereby eliminating the need for
added heat on the system.
7.

Do not spot units close to any
obstruction that will impede the
full and natural air delivery of
the unit.

Typical Factory
In the typical industrial building,
where ceilings are high, Model P
Unit Heaters may be used without
diffusers.
In plants where the ceilings are
exceptionally high, such as in crane
bays as illustrated in Model P Units
with Louver Cone Diffusers can

Figure 2.
The floor plan and elevation of a typical industrial building
showing how a Trane Unit Heater System will heat various parts. Where
ceilings are high in the main manufacturing section, large Projection Heaters
without diffusers are used. Where ceilings are exceptionally high, as in crane
bays, Model P Units with Louver Cone Diffusers provide up to 45% greater
throw to top the “ceiling heat reservoir.” Model P Units with half closed Louver
Cones blanket doorways. Model S Units with Louver Fins blanket windows.

7

Application Consideration

increase the downward projection of
heat by as much as 45% over units
without diffusers.
Model P Units with the Louver Cone
Diffusers can also be used to blanket
doorways effectively, as shown in
Figure 2 by simply adjusting half of
the louvers vertically, and half closed.
Model S horizontal-type units are
ideal for mounting in plant areas
where ceilings are low. In fact, due to
the extremely small height of the
Model S, and because all piping
connections are made at the back of
the unit, the Model S provides a
greater saving in headroom than
other horizontal unit heater makes.
As illustrated in Figure 2, the Model S
Unit Heaters may be mounted
conveniently from the ceiling, or
from building structural supports and
beams. With Louver Fin Diffusers,
they are ideal for blanketing
windows, and Model S “Bypass”
Unit Heaters, provide further
flexibility of application where
greater throw and more effective
distribution of air in the living zone is
required.

Figure 3.

Horizontal and Vertical Unit
Heater Piping and Instalation

E

LV

TE

"LOW PRESSURE STEAM GRAVITY"

The illustrations in this portion of the
catalog depict five different typical
piping configurations. Proper
selection should be based on the
operational characteristics of the
source supply. For selection and
sizing of piping, traps, filters and
other piping specialities, ASHRAE
guides and specialty manufacturer's
literature should be consulted. We
assume that the type and total design
of systems has been selected or
approved by a qualified engineer.
The installation and service manual
should be consulted for further
information on installation,
operation, drainage and system
cleaning.

VA

GA

PI

TC

H

UP

LY

PP

SU

RN

TU

RE

NT

AIR

Piping and installation is typical for
both horizontal and vertical unit
heaters – except side connections.

PI

3/4

.S

MIN

D-6059

TC

E

LV

TE

IZE

VE

VA

H

GA

UP

10

"M

IN

.(

E

LV

A
KV

25

4M

M)

C
HE

C

Figure 4.

8

UH-PRC001-EN

Application Consideration

VE
AL

V
TE
GA

"HIGH PRESSURE STEAM"

PI

TC

H

UP

LY
PP
SU

RN
TU
RE

VE

AL
EV

T
GA

PI

TC

K
OC
TC
PE
H

UP

D-6058

AP
TR SS)
ET PA
CK BY
BU AIR
ITH

(W

ER

IN

RA

ST

Figure 5.

Figure 6.

UH-PRC001-EN

9

Application Consideration

PET COCK
(SYSTEM VENT)

RE

TU

RN

GATE VALVE

SU

PP

LY

"FORCED HOT WATER"
(Serpentine Units)

GATE VALVE

DRAIN VALVE

D-6057
Figure 7.

10

UH-PRC001-EN

Selection Procedure
Trane Propeller Unit Heaters
Both Model S and Model P Propeller
Unit Heaters are ideally suited to
such a wide variety of installations
that there can be no hard and fast
rules regulating their selection. In
determining the type and size of the
units for any building, the following
points are generally considered:

BTU Requirements
While the choice of units depends
upon several important factors, the
total Btu requirement is usually
determined first. In calculating heat
loss, methods as recommended by
the ASHRAE Guide may be used, or
any other procedure which is known
to be acceptable.

Type of Building
Once the total Btu requirement is
known, the type of building together
with its architecture and its purpose
is considered.
In the many cases where a
combination of space characteristics
is found, a combination of Model S
and Model P Unit Heaters may be
used to create the most satisfactory
heating system.
The Model P Unit Heater has the
natural ability to tap the reservoir of
heated air which collects at the
ceiling level and return it to active
service in the floor zone.
The Model P can be used on either
high or low ceilings. From high
mounting positions the Model P will
allow ample clearance for moving
objects and can project heat down
into occupied areas regardless of
obstacles which would restrict the
flow of air from horizontal units.
From low mounting positions the
Model P, with proper diffusion, can
be used without disturbing nearby
occupants with direct blasts of high
velocity heated air, or requiring
return lines so low as to leave
insufficient head room.
The superior horizontal action of the
Model S, on the other hand, is ideal
for creating a wiping effect of warm
air along exposed walls which
neutralizes drafts at their source,
UH-PRC001-EN

beaming heat down narrow aisles
and production lines, and blanketing
large windows, doors and other
points of high heat loss.

Spacing of Units
It is the usual practice to divide the
building into areas with like
exposures, or in relation to heat load
distribution desired.
In general, Model S Unit Heaters
may be selected for buildings where
direct horizontal air currents are
desired and where there are no
obstacles to interrupt the flow of air
from the heaters.
Model P Unit Heaters are
successfully used where high or low
mounting heights are required and
should ordinarily be specified with
diffusers, depending upon the
mounting height and application.

Mounting Heights
The maximum effective mounting
height is determined by the outlet
temperature of the air, the outlet
velocity, the cfm for which the heater
is designed, and if a diffuser is used
– the setting of its blades.
The higher the outlet temperature of
the air, the more difficult it is to force
it down into the living zone.
The cfm also affects the mounting
height as a large volume of air will
travel farther than a small volume
under the same initial conditions of
temperature and velocity.
In the preliminary planning stages, it
is well to remember that the lowest
possible mounting height is
desirable in order to get the most
heat down to the floor line and to
allow the greatest possible diffusion
adjustment to provide tailor-made
distribution for each area.
In providing for the use of diffusers
please remember, adjustment of a
Louver Cone Diffuser to deflect the
air toward the horizontal
immediately lowers the mounting
height limit. Adjustment for lateral
deflection with the Louver Fin
Diffuser shortens the distance of
throw.

Diffusion
The use of Trane Louver Cone or
Louver Fin Diffusers influences the
selection of units in two principal
ways: First: It is seldom necessary to
install oversized heaters to extend
the maximum effective mounting
height of the Model P or the distance
of throw of the Model S. Conversely,
Trane Diffusers enable extremely low
mounting since the adjustable
blades direct heat where it is wanted
without creating uncomfortable hot
spots near the units.
Second: After the original selection
has been made, units may be located
with confidence because
adjustments in heat distribution are
possible to accommodate future
changes or unforeseen draft
conditions.

Air Changes
Better diffusion and more even
temperatures can be maintained in a
heated space when the rate of air
recirculation through the heaters is
relatively high. For buildings where
large numbers of people are
engaged, it is desirable to provide
for a greater number of air changes
than for sparsely occupied areas. A
greater number of small units are
used where wide diffusion and even
temperatures are necessary. A few
centrally located units of large
capacity would be used where there
are few occupants.

Comfort Conditions and
Economy
Air circulation, diffusion and spacing
of units are closely related to
economy and comfort in the
selection of unit heaters. The more
units used to provide the required
number of Btu’s, the more
comfortable will be the conditions
for personnel. On the other hand, a
few large units can be selected to
provide plenty of heat at low first
cost, but may be slower in response
and thorough distribution of heat.
Here again, adjustable diffusion
equipment can go a long way toward
saving the buyer first cost expense
while still providing completely
satisfactory comfort conditions.
11

Selection Procedure

Formula
The following formula is used to
arrive at final air temperature volume
when 70 F (Standard Air Basis) is
known or vice versa:

Table 1.
Max. Mounting Heights and Distance of throw for Model S Units (based on
2 lbs Steam Pressure 60F entering Air)

Cfm at final temp. =
460 + Final temp
Cfm at 70F × -------------------------------------------------460 + 70
Cfm at 70 F =
460 + 70
Cfm final air × -------------------------------------------------460 + Final temp

Determining Special Steam
Capacities
Where capacity of the unit under
standard conditions is known – 2 lbs.
steam, 60 F entering air – and it is
desired to know the capacity of this
same unit under different steam and
air conditions, follow instructions
given in Example 1.
Where a set of conditions is given –
Btu, temperature rise, final
temperature, cfm, steam pressure
available, etc. Refer to Example 2.

Useful Data
Btu/240=Sq. Ft. of radiation (EDR)

Unit

Outlet
Velocity

CFM

Final Temp
(F)

Mounting
Height

Max Throw

A08*

250

245

91

8

20

A18*

500

500

94

8

25

A25*

590

580

102

9

29

A36*

550

850

99

9

29

018

395

395

102

8

20

024

450

450

109

8

24

036

550

550

119

9

28

048

550

750

119

9

30

060

650

900

121

10

30

072

800

1100

120

10

29

084

900

1400

115

10

30

096

930

1400

123

11

38

108

1000

1800

115

11

40

120

900

1900

118

12

40

132

950

2000

121

13

54

144

1000

2200

120

13

55

156

1150

2600

115

13

55

180

800

2200

135

13

53

204

1000

2900

124

13

55

240

900

3500

123

14

57

280

980

4200

121

14

57

300

700

5000

117

15

58

360

1000

5500

120

15

60

Sq. ft. of radiation/4=Lbs. of
condensate per hour
Btu/Latent heat=Lbs. of water per
hour
Cfm x Temp. Rise x 1.085 = Btu.
Specific heat of air (70 F) = .241
Specific weight of one cubic foot of
air (70 F) =.075.

H

Cfm x 60 = cfh.
Therefore, .241 x .075 x 60 = 1.085

Example 1
Given: Model 60S Horizontal
Propeller Unit Heater with a rated
capacity of 60,000 Btu at 2 lbs. steam
with 60 F entering air.
Desired: Capacity of this unit using 15
lbs. steam and 40 F entering air.
Under 40 F and across from 15 lbs. in
Table 2, we find the factor 1.34.
60,000 x 1.34 = 80,400 Btu per hour.

MAXIMUM DISTANCE OF THROW = T

Determining Amount of
Condensate
To determine the amount of
condensate, divide the capacity in
BTU by the latent heat of steam:
80,400/945=85 lbs per hour.
945=Latent Heat of Steam at 15 psi.
(See Table 12)

12

Determining Final Temperature
Final temperature of air leaving Trane
Unit Heaters may be determined as
follows:
Inlet Air Temp. + Btu rating/Cfm X
1.085=Final Temp
Inlet Air Temp. 40F + 80,400/900
(from Table 7) X 1.085=Final Temp

UH-PRC001-EN

Selection Procedure

obtained by equipping these units
with Louver Cone Diffusers. The
individually adjustable blades of the
Louver Cone permit an infinite
variety of adjustments to meet any
on-the-job problems. By setting the
blades vertically to straighten the
airstream, as much as 45% increase
in throw can be obtained.

4.

Solution: Under 40 F and across from
30 lbs. in Table 2, find the factor 1.51.

Hot Water Selection Example

1.

Equivalent capacity of required unit
at 2 lbs. steam 60 F entering air is

Selection Procedure

Determine the MBH at 6.53 GPM
by applying factor from Table 20.
Multiply this MBH by the water
flow factor (95.8 MBH X .95=91.0
MBH)

2.

Multiply this MBH by the
conversion factor 91.0 X 1.06 =
96,500.

3.

The GPM remains constant =
6.53 GPM.

4.

Calculate the water temperature
drop WTD=Btu/hr/GPM x 485 =
96,500/(6.53)(485) = 30.5

Example 2:
Problem: A Trane Model S Horizontal
Unit Heater is desired to deliver
200,000 Btu per hour in a garage
where ventilation is required.
Entering air temperature is 40 F.
Steam at 30 lbs. pressure is available.
Temperature to be maintained is 70 F.

Required Btu per hour/F=200,000/
1.51=132,500 Btu
From Table 7, select a Number 132S
Unit Heater with a capacity of
132,000 Btu per hour with standard
coil, and at 2 lbs. steam and 60 F
entering air.
The capacity of this unit at 30 lbs.
steam and 40 F entering air is:
1.51 x 132,000 = 199,300 Btu per hour.

1.

Determine GPM: GPM=Btu/hr/
(485) WTD=95000/485x30=6.53

2.

Refer to Table 17 to select the
conversion factor at 220° EWT
and 70° EAT. Factor is 1.06.

3.

Determine equivalent MBH at
standard conditions (200° EWT,
60° EAT). Equiv. MBH=MBH/
Factor=95/1.06=89.6.

Surplus Capacity
While the ventilation load is being
handled, any air entering the space
over the desired room temperature
should be considered in the heating
calculations. This surplus capacity
can be found by multiplying the
difference between the final
temperature leaving the heater and
the room temperature to be
maintained by 1.085 and that by the
cfm. That amount of heat can be
used to offset heat losses.

Table 2.
Factors for Determining Steam Capacity of Model S Horizontal Unit
Heaters at Various Pressures and Temperatures (Table based on 2 psig and 60F
entering Air)
Steam Pressure PSIG

Model S
Maximum mounting heights for
Model S Unit Heaters are given in
Table 1. When equipped with
standard vertical Louvers, direction
of air flow can be adjusted both
horizontally and vertically.
Mounting the unit at or below
maximum mounting height will
insure that heated air reaches the
living zone.

Model P
Maximum mounting heights for
Model P Unit Heaters are given in
Table 4. These distances are figured
from the floor line to the bottom
plate of the unit heater.
Where ceilings are unusually low, a
nearly horizontal flow of air can be

UH-PRC001-EN

To determine the actual capacity of
this Model S 132 at operating
conditions (220° EWT and 70° EAT)
proceed as follows:

Select the proper size of unit heater
for whatever application desired, as
illustrated by the following
examples.
Select a Model S horizontal unit
heater to deliver 95 MBH with 220°F
entering water temperature (EWT),
70°F entering air temperature (EAT)
and a 30°F water temperature drop
(WTD).

Select unit size from Table 13.
Select the unit which will provide
89.6 MBH In this example, the
selection indicates a Model S 132
unit heater.

Blow
Through
Type

Temperature of Entering Air (F)
30

40

50

60

70

80

90

100

0

1.19

1.11

1.03

0.96

0.88

0.81

0.74

0.67

2

1.24

1.16

1.08

1.00

0.93

0.85

0.78

0.71

5

1.29

1.21

1.13

1.05

0.97

0.90

0.83

0.76

10

1.38

1.29

1.21

1.13

1.06

0.98

0.91

0.84

15

1.44

1.34

1.28

1.19

1.12

1.04

0.97

0.89

20

1.50

1.42

1.33

1.25

1.17

1.10

1.02

0.95

30

1.60

1.51

1.43

1.35

1.27

1.19

1.12

1.04

40

1.68

1.60

1.51

1.43

1.35

1.27

1.19

1.12

50

1.70

1.60

1.58

1.50

1.42

1.34

1.26

1.19

60

1.81

1.73

1.64

1.56

1.47

1.39

1.31

1.24

70

1.87

1.78

1.70

1.61

1.53

1.45

1.37

1.29

75

1.90

1.81

1.72

1.64

1.55

1.47

1.39

1.32

100

2.02

1.93

1.84

1.75

1.66

1.58

1.50

1.42

125

2.11

2.02

1.93

1.84

1.76

1.68

1.59

1.51

150

2.20

2.11

2.02

1.93

1.84

1.76

1.67

1.59

To determine the Btu per hour capacity of a Model S Horizontal Unit Heater at any steam pressure and entering air temperature multiply rated capacity at 2 psig steam 60 F entering air
(Table 7) by factor from above table.

13

Selection Procedure

Table 3.
Factors For Determining Steam Capacity Of Model P Projection Unit Heaters At Various Pressures And Temperatures
(Table based on 2 PSIG and 60 F Entering Air)
Steam Pressure PSIG

Temperature of Entering Air (F)
-10

Draw-Through Unit

0

10

20

30

40

50

60

70

80

90

100

0

1.49

1.41

1.33

1.25

1.18

1.11

1.03

0.96

0.90

0.83

0.76

0.69

2

1.52

1.45

1.37

1.29

1.22

1.15

1.07

1.00

0.93

0.86

0.80

0.73

5

1.58

1.50

1.42

1.34

1.27

1.20

1.12

1.05

0.98

0.91

0.85

0.78

10

1.64

1.57

1.49

1.41

1.34

1.27

1.19

1.12

1.05

0.98

0.91

0.85

15

1.70

1.62

1.55

1.47

1.40

1.32

1.25

1.18

1.11

1.04

0.97

0.90

20

1.75

1.67

1.60

1.52

1.45

1.37

1.30

1.23

1.16

1.09

1.02

0.96

30

1.83

1.75

1.68

1.61

1.53

1.46

1.39

1.32

1.25

1.18

1.11

1.04

40

1.90

1.82

1.75

1.68

1.61

1.53

1.46

1.39

1.32

1.25

1.18

1.11

50

1.96

1.87

1.81

1.74

1.67

1.59

1.52

1.45

1.38

1.31

1.24

1.17

60

2.02

1.94

1.87

1.79

1.72

1.64

1.57

1.50

1.43

1.36

1.29

1.22

70

2.07

1.99

1.92

1.84

1.76

1.69

1.62

1.55

1.47

1.40

1.33

1.27

75

2.10

2.02

1.94

1.86

1.79

1.71

1.64

1.57

1.49

1.42

1.36

1.29

Note:
To determine the Btu per hour capacity of a Model P projection unit heater at any steam pressure and entering air temperature, multiply rated capacity at
2 psig steam 60 F entering air (Table 8) by factor from Table 3. Factors in italics: Units should not be operated when entering air is below freezing at steam
pressures below 10 psig.

Table 4.

Maximum Mounting Heights in Feet for Model P Unit Heaters with and without Louver Cone Diffuser
Unit
Size

14

Steam Pressure (PSI)
2

5

10

50

75

42-P

10.5
12.5

10.0
12.0

10.0
12.0

9.0
11.0

8.0
10.0

42-P LS*

8.0
9.0

8.0
8.5

8.0
8.5

8.0
8.0

8.0
8.0

42-P-L**

12.5
14.5

12.0
14.0

12.0
13.5

10.5
12.0

9.5
11.5

42-P-L LS

9.0
10.5

8.5
10.0

8.5
10.0

8.0
9.0

8.0
8.5

64-P

12.0
14.5

11.5
14.0

11.5
14.0

10.0
12.0

9.5
11.5

64-P LS

9. 5
11.5

9.0
11.0

9.0
11.0

8.0
9.5

8.0
9.0

64-P-L

15.0
19.0

14.5
18.5

14.5
18.5

12.5
16.5

12.0
16.0

64-P-L LS

11.5
14.0

11.0
13.5

11.0
13.5

9.5
12.0

8.0
11.5

80-P

15.0
18.5

14.5
18.0

14.0
17.5

12.0
15.5

11.5
13.5

80-P LS

11.0
13.5

10.5
13.0

10.5
13.0

9.0
11.5

8.5
11.0

80-P-L

18.0
22.0

17.5
21.0

17.5
21.0

15.0
19.0

14.0
18.0

80-P-L LS

13.0
17.0

12.5
16.5

12.0
16.0

11.0
14.0

10.5
13.5

102-P

14.0
17.0

13.5
16.5

13.0
16.0

11.5
14.0

11.0
13.5

102-P LS

11.0
13.5

10.5
13.0

10.5
13.0

9.5
12.0

9.0
11.5

102-P-L

17.5
21.5

17.0
21.0

16.5
20.5

15.0
18.5

14.5
17.5

UH-PRC001-EN

Selection Procedure

Table 4.

Maximum Mounting Heights in Feet for Model P Unit Heaters with and without Louver Cone Diffuser (continued)
Unit
Size

Steam Pressure (PSI)
2

5

10

50

75

102-P-L LS

15.0
18.5

14.5
18.0

14.5
18.0

13.0
16.0

12.5
15.0

122-P

16.0
19.5

15.5
19.0

15.5
18.5

14.0
17.0

13.5
16.0

122-P-L

21.0
26.0

20.5
25.5

20.0
25.0

17.5
22.5

17.0
21.5

146-P

15.5
19.0

15.0
18.5

14.5
18.0

13.0
16.0

12.0
15.5

146-P-L

18.0
22.5

17.5
22.0

17.5
21.5

15.0
18.5

14.0
18.0

166-P

18.0
22.5

17.5
22.0

17.0
21.5

14.5
19.0

14.0
18.0

166-P-L

22.0
27.5

21.5
27.0

21.0
26.5

18.5
23.5

17.5
22.5

202-P

22.0
27.5

21.5
27.0

21.0
26.5

18.5
24.0

17.5
23.0

202-P-L

25.5
31.5

25.0
31.0

24.5
30.5

22.0
27.0

21.0
26.0

252-P

20.0
25.0

19.5
24.0

19.0
23.5

17.0
20.5

16.0
19.5

252-P-L

24.0
29.5

23.5
28.5

23.0
28.0

20.0
24.5

19.0
23.5

280-P

21.0
26.0

20.5
25.5

20.0
25.0

17.5
22.0

17.0
21.0

280-P-L

25.5
32.0

25.0
31.0

24.5
30.0

21.0
26.0

20.0
25.0

336-P

24.0
30.0

23.0
29.0

22.0
28.0

20.0
25.0

19.0
24.0

336-P-L

29.0
36.0

28.5
35.0

28.0
34.0

25.0
30.0

24.0
29.0

384-P

28.5
35.5

28.0
35.0

27.5
34.0

24.0
30.0

23.0
29.0

384-P-L

32.5
41.0

31.5
40.0

30.5
39.0

27.5
35.0

26.5
33.5

500-P

29.5
36.5

29.0
36.0

28.5
35.5

25.0
32.0

24.0
30.5

500-P-L

35.0
43.5

34.0
42.5

33.0
41.5

29.0
35.0

28.0
34.0

600-P

34.0
42.5

33.0
41.5

32.0
40.5

28.0
36.0

27.0
34.5

600-P-L

37.0
46.5

36.0
45.5

35.0
44.5

31.0
39.0

30.0
37.0

720-P

38.5
48.0

37.5
47.0

36.5
46.0

32.0
40.0

30.5
39.0

720-P-L

42.5
53.0

41.5
52.0

40.5
51.0

35.0
44.0

33.5
42.0

Notes:
*LS = Low speed.
**PL = Model P low final temperature model with all air ports open.
Figures in bold face show maximum mounting height with louver cone diffusers set vertically.
To meet CSA and OSHA requirements, Model P Unit Heaters mounted lower than 8.0 ft. from the floor must be equipped with an OSHA fan guard. Table 4
based on 60 F entering air temperature. In providing for the use of diffusers, it must be remembered that adjustment of a LCD to deflect air toward
horizontal immediately lowers the mounting height limit.

UH-PRC001-EN

15

Selection Procedure

Table 5.

Maximum Spread in Feet

Unit Size: P

42

64

80

102

122

146

166

202

252

280

336

384

500

600

720

Spread ft

15

17

20

24

26

27

28

32

35

37

45

50

54

57

60

Additional Selection Data
Motor and Fan Speeds
Motor and fan speeds are selected to
provide efficient performance. The
solid-state speed control will provide
an infinite number of speeds
between the highest and the lowest
cataloged fan speeds. The speed
control is not calibrated in specific
fan speeds. For use on units with 115
volt/60 cycle/1 phase, 1/8 hp and
smaller standard motors only.

Standard and Bypass Units
Standard models meet most
requirements and are most
economical. Bypass units meet
conditions as mentioned above, and
are also used where low final
temperature is specified.

25 and 50 Cycle Unit Heat
Capacities
Table 6 shows the Btu, cfm, and the
hp required on unit heaters when
operated on 25 or 50 cycle circuits.
The multipliers in Table 6 may be
applied to standard 60 cycle unit
capacities to determine the capacities
of the same unit when operating on
25 or 50 cycle current. These
multipliers may be used on units
cataloged at 1050 to 1150 RPM.
For the smaller Trane Unit Heaters
cataloged at 1550 RPM, the capacity
data in the catalog may be applied to
either 25 or 50 cycle service.
Table 6.

Multiplier To Be Applied To 60-Cycle 1100 RPM Ratings

25 CY

50 CY

BTU

1425

1425

1.17

1.25

1.95

950

.87

.833

.572

710

.7

.623

.242

710

16

Factors for Determining Unit Heater Capacities at 25 or 50 Cycles
RPM

CFM

HP

UH-PRC001-EN

Performance Data
Steam Performance Data
Horizontal Unit Heaters
Performance based on 2# steam pressure at heater with air entering @ 60° F (max working pressure 150 PSI,366° F)
Table 7.
Model
No.
S-18

S-24

S-36

S-48

S-60

S-72

S-84

S-96

S-108

Total
MBh

Cond.
lbs./hr.

E.D.R.
Sq. Ft.

LAT °F

18,000

18.0

75

102

16,200

16.2

68

105

24,000

24.5

100

109

21,600

22.0

90

112

36,000

37.0

150

119

32,400

33.0

135

120

48,000

49.0

200

119

43,200

44.0

180

123

60,000

61.0

250

121

54,000

55.0

225

131

72,000

73.0

300

120

64,800

66.0

270

123

84,000

85.0

350

115

75,600

76.0

315

123

96,000

97.0

400

123

86,400

88.0

360

132

108,000

110.0

450

115

97,200

98.0

405

120

Motor
HP
16 Watts

16 Watts

25 Watts

1/20

1/20

1/20

1/12

1/12

1/12

Outlet
Motor Nominal Velocity
RPM
CFM
FPM

Sound
Rating

1550

395

395

II

1350

330

330

I

1550

450

450

II

1350

380

380

I

1550

550

550

II

1350

480

480

I

1000

750

550

II

900

630

460

I

1000

900

650

II

900

700

510

I

1000

1100

800

II

900

950

700

I

1000

1400

900

III

900

1100

750

II

1000

1400

930

III

900

1100

800

II

1000

1800

1000

III

900

1500

900

II

S-120

120,000

122.0

500

118

1/3

1140

1900

900

III

S-132

132,000

134.0

550

121

1/3

1140

2000

950

IV

S-144

144,000

146.0

600

120

1/3

1140

2200

1000

IV

S-156

156,000

160.0

650

115

1/3

1140

2600

1150

IV

S-180

180,000

190.0

770

135

1/3

1140

2200

800

III

S-204

204,000

208.0

850

124

1/3

1140

2900

1000

IV

S-240

240,000

244.0

1000

123

1/3

1140

3500

900

IV

S-280

280,000

280.0

1100

121

1/2

1100

4200

980

IV

S-300

300,000

310.0

1250

117

1/2

1100

5000

700

IV

S-360

360,000

366.0

1500

120

1/2

1100

5500

1000

IV

* For the lower output, an optional Speed Controller must be ordered.
For Sound Ratings, see the Technical and Mounting Data-portion of this chapter.

UH-PRC001-EN

17

Performance Data

Vertical Unit Heaters
Performance based on 2# steam pressure at heater with air entering @ 60°F.
Table 8.

Standard Units
Motor
RPM

Nominal
CFM

Outlet
Velocity
FPM

1550

595

877

1150

436

658

1550

989

1005

1150

706

727

1550

1200

1220

1150

858

894

1070

1490

980

850

1180

783

1/6

1100

1790

1170

III

1/6

1100

2220

1045

III

121

1/6

1100

2620

1230

IV

118

1/4

1100

3200

1495

III

1040

115

1/4

1100

4180

1205

IV

1180

119

1/2

1100

4430

1275

IV

345

1390

119

3/4

1140

5210

1500

IV

400

1610

118

3/4

1140

6140

1770

IV

496,000

514

2070

117

1-1/2

1160

8020

1640

IV

P-600

585,000

605

2440

117

1-1/2

1160

9450

1930

IV

P-720

705,000

729

2940

119

3

1165

11,000

2250

IV

Model
No.

Total
MBh

Cond.
lbs./hr.

E.D.R.
Sq. ft.

LAT °F

41,300

43

172

124

33,600

55

140

131

65,500

68

273

121

52,800

55

220

129

80,600

83

336

122

65,100

67

271

130

101,800

106

424

123

87,900

91

366

129

P-122

124,400

129

518

124

P-146

152,000

157

633

123

P-166

173,000

179

720

P-202

210,200

208

838

P-252

249,800

260

P-280

283,800

294

P-336

333,400

P-384

386,000

P-500

P-42

P-64

P-80

P-102

Motor
HP
1/40

1/20

1/20

1/8

Sound
Rating
I

II

II

II

Notes:
Constant speed units are rated at capacities shown in regular type; capacities shown in italic faced type apply only to units with multi-speed motors.
** To determine BTU per hour capacities at various steam pressures and entering air temperatures, use conversion factors from Table 11. Final temperatures at new conditions can be calculated by applying basic formula.

18

UH-PRC001-EN

Performance Data

Table 9.
Model
No.
P-42L

P-64L

Low Output Units: Standard Model Units w/All Air Ports Open
Total
MBh

Cond.
lbs./hr.

E.D.R.
Sq. ft.

LAT °F.

34.8

36

145

108

26.0

27

108

111

57.2

59

238

104

45.8

48

191

109

Motor
HP
1/40

1/20

Motor
RPM

Nominal
CFM

Outlet Velocity
FPM

1550

668

950

1150

470

672

1550

1200

1190

1150

862

858

1550

1360

1350

1150

995

992

1070

1640

1050

850

1290

827

Sound
Rating
I

I

68.0

71

283

106

55.0

57

229

111

85.4

89

356

108

71.2

74

296

111

P-122L

111.0

115

462

107

1/6

1100

2180

1390

III

P-146L

125.0

130

524

109

1/6

1100

2360

1080

III

P-166L

149.0

154

620

107

1/6

1100

2920

1340

IV

P-202L

176.8

183

736

108

1/4

1100

3390

1560

III

P-252L

214.9

224

895

104

1/4

1100

4500

1270

IV

P-280L

251.8

260

1050

106

1/2

1100

5040

1420

IV

P-336L

291.0

302

1210

107

3/4

1140

5700

1610

IV

P-80L

P-102L

1/20

1/8

II

II

P-384L

344.0

356

1430

108

3/4

1140

6600

1870

IV

P-500L

428.0

446

1785

102

1-1/2

1160

9380

1860

IV

P-600L

515.0

533

2140

106

1-1/2

1160

10,300

2060

IV

P-720L

620.0

642

2580

108

3

1165

11,900

2380

IV

NOTES:
Constant speed units are rated at capacities shown in regular type; capacities shown in italic faced type apply only to units with multi-speed motors.
**To determine BTU per hour capacities at various steam pressures and entering air temperatures, use conversion factors from Table 11. Final temperatures at new conditions
can be calculated by applying basic formula.

Table 10.

STEAM CALCULATIONS AND CORRECTION FACTORS
EXAMPLE:
UNIT SIZE __________ P-42
Steam Pressure _____10 PSI
Entering Air Temp. ____ 40°F

I. CAPACITY
A. For 2 lbs. steam, 60° entering air

Read output directly from Table 8: 41,300 BTU/HR.

B. For higher steam pressures and/or E.A.T.'s above Multiply output from Table 8 by appropriate
or below 60°F
correction factor from Table 11.

41,300 x 1.27 = 52,451 BTU/HR.

II. FINAL AIR TEMPERATURE
A. For 2 lbs. steam, 60° entering air

Read temperature directly from Table 8: 124°F.

B. For capacities calculated in I.B. (above)

Output from I.B./1.085 x CFM from Table 8 +
E.A.T. = Final Air Temp

III. FINAL AIR VOLUME
A. For 2 lbs. steam, 60° entering air

460 + Final Air Temp from Table 8/530 x Nom. CFM 460 + 124/530 x 595 = 655 CFM
from Table 8 = Final Air Volume

B. For final air temperatures calculated In II. B.
(above)

460 + Final Air Temp from II.B./530 x Nom. CFM
from Table 8 = Final Air Volume

IV. CONDENSATE PER HOUR
A. For 2 lbs. steam, 60° entering air

Read lbs. per hour from Table 8: 43 LBS./HR.

B. For capacities calculated in I.B. (above)

Output from I.B./Latent Heat from Table 12 = lbs. 52,451/953 = 55.0 LBS./HR.
per hour of condensate

UH-PRC001-EN

52,451/1.085 x 595 + 40 = 121.0°F

460 + 121.0/530 x 595 = 652 CFM

19

Performance Data

Table 11.

STEAM CORRECTION FACTORS BASED ON 2 LBS. STEAM 60° E.A.T.
STEAM PRESSURE - LBS. PER SQ. IN. (SATURATED)

ENTERING
AIR TEMP

0

2

5

10

15

20

30

40

50

75

30°

1.18

1.22

1.27

1.34

1.40

1.45

1.53

1.61

1.67

1.79

40°

1.11

1.15

1.20

1.27

1.32

1.37

1.46

1.53

1.59

1.71

50°

1.03

1.07

1.12

1.19

1.25

1.30

1.39

1.46

1.52

1.64

60°

0.96

1.00

1.05

1.12

1.18

1.23

1.32

1.39

1.45

1.57

70°

0.90

0.93

0.98

1.05

1.11

1.16

1.25

1.32

1.38

1.49

80°

0.83

0.86

0.91

0.98

1.04

1.09

1.18

1.25

1.31

1.42

90°

0.76

0.80

0.85

0.91

0.97

1.02

1.11

1.18

1.24

1.36

100°

0.69

0.73

0.78

0.85

0.90

0.96

1.04

1.11

1.17

1.29

Table 12.

PROPERTIES OF SATURATED STEAM
STEAM PRESSURE IN LBS. PER SQUARE INCH GAUGE

Steam Temperature-°F
Latent Heat of Steam

0

2

5

10

15

20

30

40

50

75

212.0

218.5

227.1

239.4

249.8

258.8

274.0

286.7

297.7

319.9

970

966

961

953

946

940

929

920

912

891

Note:

Ratings apply only to free inlet and discharge without diffusers.

Note:

All motors are constant speed and operate at top speed as indicated in motor data. Models 42 through 102 can
be run at reduced speed with addition of optional variable speed switch. This switch is factory-calibrated for low
and high speed ratings, with intermediate speeds infinitely controllable. Models 166 through 720 operate at
constant speed as indicated in motor data.

Note:

For specific motor data, refer to motor specifications at the end of this chapter.

Note:

To correct for entering air temperatures, use 1° temperature rise for each foot in mounting height. As an
example, 60° air is required at work area (5 ft. above floor) units are to be mounted at (20 ft.) above floor.
Mounting height (20 ft.) minus work height (5 ft.) equals differential (15 ft.) or, 15° rise in air temperature at unit
air inlet. Correct for actual inlet air temperature of 75° (60° + 15° = 75° E.A.T.) on Table 10

20

UH-PRC001-EN

Performance Data

Hot Water Performance Data
Horizontal Unit Heaters
Peformance based on 200° EWT, 60° E.A.T., 20° WTD (max working pressure 150 PSI, 366° F)
Table 13.

Model No.
S-A08

S-A18

S-A25

S-A36

S-18

S-24

S-36

S-48

S-60

S-72

S-84

S-96

S-108

Total MBh
8.0
6.8
18.4
15.7
24.8
21.2
35.9
32.3
13.1
11.7
17.4
15.6
26.1
23.5
34.8
31.3
43.6
39.2
52.3
47.0
61.0
54.9
69.7
62.7
78.4
70.5

GPM
0.80

1.9

2.5

3.6

1.3

1.8

2.7

3.5

4.4

5.3

6.1

7.0

7.9

LAT °F
91
90
94
96
102
106
99
100
95
99
96
98
103
103
103
111
105
112
104
106
100
106
106
113
100
103

WPD

Motor HP

.80

16 Watts

2.2

16 Watts

2.2

25 Watts

3.0

1/20

.005

16 Watts

.014

16 Watts

.09

25 Watts

.12

1/20

.17

1/20

.23

1/20

.24

1/12

.29

1/12

.36

1/12

RPM

Nominal
CFM

Outlet
Velocity
FPM

Sound Rating
II

1550

245

250

1350

210

215

I

1550

500

500

II

1350

420

420

I
II

1550

580

590

1350

460

450

I

1000

850

550

II

900

750

480

I
II

1550

395

395

1350

350

350

I

1550

450

450

II

1350

380

380

I
II

1550

550

550

1350

480

480

I

1000

750

550

II

900

630

460

I
II

1000

900

650

900

700

510

I

1000

1100

800

II

900

950

700

I
III

1000

1400

900

900

1100

750

II

1000

1400

930

III

900

1100

800

II

1000

1800

1000

III

900

1500

900

II

S-120

87.1

8.8

102

.39

1/3

1140

1900

900

III

S-132

95.8

9.6

104

.41

1/3

1140

2000

950

IV

S-144

104.0

10.4

104

.43

1/3

1140

2200

1000

IV

S-156

113.0

11.3

100

.53

1/3

1140

2600

1150

IV

S-180

118.0

11.8

110

.60

1/3

1140

2200

800

III

S-204

148.1

14.9

107

.79

1/3

1140

2900

1000

IV

S-240

174.0

17.4

106

1.06

1/3

1140

3500

900

IV

S-280

209.1

21.0

106

1.33

1/2

1100

4200

980

IV

S-300

230.0

23.0

102

2.1

1/2

1100

5000

700

IV

S-360

261.3

26.2

103

2.1

1/2

1100

5500

1000

IV

* For the lower output, an optional Speed Controller must be ordered.

UH-PRC001-EN

21

Performance Data

Vertical Unit Heaters
Table 14.

Standard Output Units**

Water
Temp.
Model No. Drop

P-42

P-42*

P-64

P-64*

P-80

P-80*

P-102

P-102*

P-122

P-146

P-166

P-202

P-252

P-280

22

Total
MBh

GPM

WPD

LAT °F

10°

28.8

5.93

.37

104.6°

20°

22.7

2.34

.06

95.2°

30°

16.7

1.15

.02

85.9°

10°

22.9

4.71

.24

108.3°

20°

18.1

1.87

.04

98.3°

30°

13.4

.92

.01

88.4°

10°

48.1

9.92

1.05

104.8°

20°

39.6

4.08

.19

96.9°

30°

31.1

2.14

.06

89.0°

10°

38.1

7.85

.67

109.7°

20°

31.5

3.24

.13

101.1°

30°

24.8

1.71

.04

92.4°

10°

58.7

12.11

.98

105.1°

20°

48.4

4.99

.18

97.2°

30°

38.1

2.62

.05

89.3°

10°

46.5

9.59

.63

110.0°

20°

38.5

3.97

.12

101.2°

30°

30.5

2.09

.03

92.7°

10°

77.2

15.91

2.06

106.6°

20°

68.3

7.03

.44

101.2°

30°

59.3

4.08

.16

95.8°

10°

63.7

13.13

1.43

108.6°

20°

56.5

5.82

.31

103.1°

30°

49.2

3.38

.11

97.6°

10°

94.9

19.55

3.04

108.9°

20°

83.7

8.63

.65

103.1°

30°

72.5

4.98

.23

97.3°

10°

117.6

24.24

4.32

108.8°

20°

105.2

10.84

.96

103.7°

30°

92.8

6.38

.36

98.5°

10°

132.4

27.29

3.67

106.6°

20°

118.6

12.22

.81

101.7°

30°

104.8

7.20

.30

96.9°

10°

156.2

32.20

5.02

105.0°

20°

139.7

14.40

1.11

100.2°

30°

123.2

8.47

.41

95.5°
101.8°

15°

188.9

25.95

3.92

20°

180.1

18.56

2.10

99.9°

30°

162.7

11.18

.82

96.0°

15°

215.4

29.60

5.02

104.8°

20°

205.4

21.17

2.68

102.7°

30°

185.3

12.73

1.04

98.5°

Outlet
Velocity
FPM

Sound Rating

Motor HP

RPM

Nominal
CFM

1/40

1550

595

877

I

1/40

1150

436

658

I

1/20

1550

989

1005

II

1/20

1150

706

727

II

1/20

1550

1200

1220

II

1/20

1150

858

894

II

1/8

1070

1528

980

II

1/8

850

1208

783

II

1/6

1100

1790

1170

III

1/6

1100

2220

1045

III

1/6

1100

2620

1230

IV

1/4

1100

3200

1495

III

1/4

1100

4162

1205

IV

1/2

1100

4430

1275

IV

UH-PRC001-EN

Performance Data

Table 14.

Standard Output Units** (continued)

Water
Temp.
Model No. Drop
15°
P-336

P-384

P-500

P-600

P-720

Total
MBh

GPM

WPD

LAT °F

254.9

35.03

6.88

105.1°

20°

242.9

25.03

3.67

103.0°

30°

218.9

15.04

1.42

98.7°

15°

294.7

40.49

6.60

104.2°

20°

280.8

28.94

3.52

102.2°

30°

253.1

17.39

1.36

98.0°

15°

-----

-----

-----

-----

20°

368.1

37.93

5.81

102.3°

30°

333.6

22.92

2.29

98.3°

15°

451.2

62.00

8.78

104.0°

20°

431.1

44.43

4.72

102.0°

30°

391.0

26.86

1.86

98.1°

15°

-----

-----

-----

-----

20°

519.4

53.52

5.29

103.5°

30°

470.9

32.35

2.08

99.5°

Outlet
Velocity
FPM

Sound Rating

Motor HP

RPM

Nominal
CFM

3/4

1140

5210

1500

IV

3/4

1140

6140

1770

IV

1-1/2

1160

8020

1640

IV

1-1/2

1160

9450

1930

IV

3

1165

11,000

2250

IV

Outlet
Velocity
FPM

Sound Rating

**Performance based on 200° EWT, 20° T.D., 60° E.A.T. Performance at 10° & 30° T.D. is also shown.
For capacities at other conditions, use the correction multipliers in Table 16, Table 17, Table 18, Table 19, and Table 20
*Speed controller option is required for reduced ratings.

Table 15.

Low Output Units Standard Model P Units with All Air Ports Open**

Water
Temp.
Model No. Drop

P-42L

P-42L*

P-64L

P-64L*

P-80L

P-80L*

P-102L

P-102L*

Total MBh

GPM

WPD

LAT °F

10°

23.9

4.92

.26

92.9°

20°

18.9

1.95

.04

86.1°

30°

14.0

.96

.01

79.3°

10°

16.7

3.45

.13

92.8°

20°

13.5

1.39

.02

86.4°

30°

-----

-----

-----

-----

10°

41.5

8.56

.80

91.9°

20°

34.2

3.53

.15

86.3°

30°

27.0

1.85

.04

80.7°

10°

32.4

6.68

.50

94.7°

20°

26.9

2.77

.09

88.7°

30°

21.3

1.46

.03

82.8°

10°

48.9

10.09

.69

93.2°

20°

40.5

4.17

.13

87.4°

30°

32.0

2.20

.04

81.7°

10°

38.5

7.94

.44

95.7°

20°

32.0

3.29

.08

89.6°

30°

25.4

1.75

.02

83.5°

10°

63.7

13.13

1.43

93.5°

20°

56.5

5.82

.31

89.7°

30°

49.2

3.38

.11

85.9°

10°

54.5

11.24

1.06

93.5°

20°

48.5

4.99

.23

89.8°

30°

42.4

2.91

.08

86.1°

UH-PRC001-EN

Motor HP

RPM

Nominal
CFM

1/40

1550

668

950

I

1/40

1150

470

672

I

1/20

1550

1200

1190

II

1/20

1150

862

858

II

1/20

1550

1360

1350

II

1/20

1150

995

992

II

1/8

1070

1752

1050

II

1/8

850

1499

827

II

23

Performance Data

Table 15.

Low Output Units Standard Model P Units with All Air Ports Open** (continued)

Water
Temp.
Model No. Drop
10°
P-122

P-146L

P-166L

P-202L

P-252L

P-280L

P-336L

P-384L

P-500L

P-600L

P-720L

Total MBh

GPM

WPD

LAT °F

83.7

17.24

2.40

95.4°

20°

73.9

7.62

.51

91.3

30°

64.2

4.41

.18

87.1°

10°

95.4

19.66

2.92

97.3°

20°

85.5

8.81

.65

93.4°

30°

75.6

5.20

.24

89.5°

10°

112.3

23.15

2.70

95.4°

20°

100.7

10.38

.60

91.8°

30°

89.2

6.13

.22

88.1°

10°

135.8

27.98

3.85

96.9°

20°

121.8

12.52

.85

93.0°

30°

107.3

7.37

.32

89.2°

10°

168.5

34.72

6.75

94.5°

20°

153.8

15.85

1.56

91.4°

30°

139.1

9.56

.61

88.4°

10°

188.9

25.95

3.92

94.5°

20°

180.1

18.56

2.10

92.9°

30°

162.7

11.18

.82

89.7°

10°

220.9

30.35

5.26

95.7°

20°

210.6

21.70

2.81

94.1°

30°

189.9

13.05

1.09

90.7°

10°

260.7

35.82

5.24

96.4°

20°

248.5

25.61

2.80

94.7°

30°

224.2

15.40

1.09

91.3°

10°

-----

-----

-----

-----

20°

310.5

32.00

4.23

90.5°

30°

281.7

19.35

1.67

87.7°

10°

394.4

54.19

6.83

95.3°

20°

377.0

38.85

3.68

93.7°

30°

342.2

23.51

1.45

90.6°

10°

-----

-----

-----

-----

20°

453.7

46.76

4.11

95.1°

30°

411.7

28.28

1.62

91.9°

Outlet
Velocity
FPM

Sound Rating

Motor HP

RPM

Nominal
CFM

1/6

1100

2180

1390

III

1/6

1100

2360

1080

III

1/6

1100

2920

1340

IV

1/4

1100

3390

1560

III

1/4

1100

4507

1270

IV

1/2

1100

5040

1420

IV

3/4

1140

5700

1610

IV

3/4

1140

6600

1870

IV

1-1/2

1160

9380

1860

IV

1-1/2

1160

10,300

2060

IV

3

1165

11,900

2380

IV

**Performance based on 200° EWT, 20° T.D., 60° E.A.T. Performance at 10° & 30° T.D. is also shown.
For capacities at other conditions, use the correction multipliers in Table 16, Table 17, Table 18, Table 19, and Table 20.

24

UH-PRC001-EN

Performance Data

Table 16.

HOT WATER CALCULATIONS AND CORRECTION FACTORS
EXAMPLE:
UNIT:__________________P-42
Entering Water Temp. _____160°F
Entering Air Temp. ________ 40°F
Water Temperature Drop ____ 10°F

I. CAPACITY @ 20° TD:
A. For 200° EWT, 60° EAT

Read output directly from Table 14 & Table 15,
22,700 BTU/HR (Ref., Std. P-42, p. 22).

B. For EWT and/or EAT above or below
Standard

Multiply output from Table 14 & Table 15 by factor from
Table 17.

22,700 x .878 = 19,931 BTU/HR.

II. CAPACITY AT OTHER TD's
A. For TD's from 5 to 60°F

Multiply output obtained in IA. or IB.
(above) by appropriate factor from Table 18

IA - 22,700 x 1.15 = 26,105 BTU/HR.
-ORIB - 19,931 x 1.15 = 22,921 BTU/HR.

III. GPM AT OTHER TD's
A. For TD's from 5 to 60°F

Multiply GPM of unit for 20° TD, from Table 14 by
appropriate factor from Table 18

2.34 x 2.30 = 5.38 GPM (Applies only
to units with. Std. 200° EWT, 60° EAT.)
For all others calculate using formula GPM = BTU/500 x TD

IV. PRESSURE LOSS AT OTHER TD's
A.ForTD's from 5 to 60°F

Multiply P.D. of unit for 20° TD, from Table 14 & Table 15 .06 x 5.00 = .30 Ft. H2O
by appropriate factor from Table 18

Table 17.

HOT WATER CONVERSION FACTORS BASED ON 200° ENTERING WATER 60° ENTERING AIR 20° TEMPERATURE DROP
ENTERING WATER TEMPERATURE -20° WATER TEMPERATURE DROP

ENTERING AIR
TEMPERATURE

100°

120°

140°

160°

180°

200°

220°

240°

260°

280°

300°

30°

0.518

0.666

0.814

0.963

1.120

1.268

1.408

1.555

1.702

1.850

1.997

40°

0.439

0.585

0.731

0.878

1.025

1.172

1.317

1.464

1.609

1.755

1.908

50°

0.361

0.506

0.651

0.796

0.941

1.085

1.231

1.375

1.518

1.663

1.824

60°

0.286

0.429

0.571

0.715

0.857

1.000

1.143

1.286

1.429

1.571

1.717

70°

0.212

0.353

0.494

0.636

0.777

0.918

1.060

1.201

1.342

1.483

1.630

80°

0.140

0.279

0.419

0.558

0.698

0.837

0.977

1.117

1.257

1.397

1.545

90°

0.069

0.207

0.345

0.483

0.621

0.759

0.897

1.035

1.173

1.311

1.462

100°

0

0.137

0.273

0.409

0.546

0.682

0.818

0.955

1.094

1.230

1.371

To obtain the BTU capacity for conditions other than those in the basic capacity tables, multiply the basic rating (200° entering water, 60° entering air) by the proper constant
from Table 17.

Table 18. HOT WATER BTU, GPM AND PRESSURE LOSS FACTORS BASED ON STANDARD CONDITIONS OF 200°F ENTERING
WATER 60°F ENTERING AIR & 20°F WATER DROP
USE FACTORS FROM THIS TABLE TO OBTAIN
APPROXIMATE RESULTS

TEMPERATURE DROP °F
5

10

15

20

25

30

40

50

60

To obtain BTU for other Water Temperature Drops,
multiply basic BTU rating by applicable Factor.

1.25

1.15

1.08

1.00

.94

.90

.83

.76

.72

To obtain GPM for other Water Temperature Drops,
multiply basic GPM rating by applicable Factor.*

5.00

2.30

1.44

1.00

.74

.59

.40

.30

.24

5.00

2.00

1.00

.60

.40

.20

.13

.07

To obtain Pressure Loss Feet of Water for other
10.00
temperature Drops, multiply Basic loss at 20° drop by
Factor.

Table 19.

*MINIMUM WATER FLOW - GPM

MODEL No.

42

64

80

102

146

166

202

252

336

384

500

600

700

MIN. GPM

.55

.55

.55

.55

.82

.82

1.10

1.10

1.10

1.10

1.0

1.4

1.6

Table 20.

*HEATING CAPACITY FACTORS FOR VARIOUS RATES OF WATER FLOW

% of Rated Water Flow

25%

50%

75%

100%

125%

150%

175%

Btu/Hr Heating Capacity

.80

.89

.96

1.00

1.04

1.07

1.10

UH-PRC001-EN

25

Performance Data

Technical & Mounting
Data
Horizontal Unit Heaters
Technical Data
The performance data listed in
Table 13, Table 14, and Table 15
include sound ratings. The ratings
provide a guide in determining the
acceptable degree of loudness in
particular occupancy situations.
Certain general rules apply to specific
selection of unit heaters with regard
to degree of quietness (or loudness);
•

The greater the fan diameter, the
higher the sound level.

•

The higher the motor RPM, the
higher the sound level. Note that
on most units the lower the
speed mode results in lowering
the sound rating one increment.

•

Selecting a larger number of
smaller units generally results in
lower overall noise levels than
fewer large units.

All horizontal steam and hot water
unit heater motors, whether fan
guard or shelf-mounted, are isolated
from the mechanical mount by
resilient isolators. This mounting
along with balanced fan blades and
excellent overall construction
integrity, assures you the utmost in
quiet operation.

CATEGORY OF AREA

SOUND RATING

apartment, assembly hall, classrooms, churches, courtrooms, executive
offices, hospitals, libraries, museums, theatres

I

dining rooms, general offices, recreation areas, small retail stores

II

restaurants, banks, cafeterias, department stores, public buildings,
service stations

III

gymnasiums, health clubs, laundromats, supermarkets

IV

garages, small machine shops, light manufacturing

V

Factories, foundries, steel mills

III-VII*

*Depending on specific use in these facilities, size of operation, etc.

Table 21.

Corrections When Using Glycol Solution in System
Propylene
Glycol

Heat transfer @ 180°F with no
increase inflow rate

20% solution

.97*

50% solution

.90*

G.P.M. Req'd. @ 180°F, 20°F ∆ t (no
correction to pump curve)

1.10%*

Pump Head Req'd. @ 180°F w/
increase in G.P.M.

1.23%*

Specify gravity (water = 1.0)

1.045-1.055*

Pounds/Gallons @ 60°F (water =
8.3453 Pound/Gallon)

8.77

pH @ 50% by volume

9.5
55%

Freezing Point by volume

-

50%

-28°F

40%

13°F

30%

+ 4°F

20%

+17°F

*Compared to water.

The following table outlines sound
ratings for various applications. The
lower the number, the quieter the
unit and the lower the sound
requirement.

Table 22.

Sea level - 1000 ft.

1.00

Mounting Heights and Throws

1000 ft. - 3000 ft.

.958

The following table is based on 60°
entering air and either 2 lb. steam or
200° water with a 20° T.D. The data is
based on the higher speed CFM
throughout and velocity. Care should
be exercised in locating adjacent unit
heaters and allowance should be
made for obstructions in the air
pattern and conflicting air currents
from other air moving devices.

3000 ft. - 5000 ft.

.929

5000 ft. - 7000 ft.

.900

7000 ft. - 10000 ft.

.871

26

Approximate factors at varying altitudes
Altitude

Factor

UH-PRC001-EN

Performance Data

Motor Characteristics Data
Horizontal Unit Heaters
Table 23.

Totally Enclosed Motor Type

S Unit Model No.

AMP

MCA

MOP

HP

RPM

115/1/60
18, 24, A08, A18

0.8

1

1.8

16W*

1550

A36

1.4

1.8

3.2

1/20*

1000
1550

36, A25

1.2

1.5

2.7

25W*

48, 60, 72

1.4

1.8

3.2

1/20*

1000

84, 96, 108

2.2

2.8

5.0

1/12*

1000

120, 132, 144, 156,
180, 204, 240

4.5

5.6

10.1

1/3

1140

280, 300, 360

5.4

6.8

12.2

1/2

1100

230/1/60
18, 24, A08, A18

0.4

0.5

0.9

16W

1550

A36

1.4

1.8

3.2

1/20†

1000
1550

36, A25

0.6

0.8

1.4

25W

48, 60, 72

1.4

1.8

3.2

1/20†

1000

84, 96, 108

2.2

2.8

5.0

1/12†

1000

120, 132, 144, 156,
180, 204, 240

4.5

5.6

10.1

1/3†

1140

280, 300, 360

5.4

6.8

12.2

1/2†

1100

1/2**

1140

208-230/460/3/60
48, 60, 72, 84, 96,
108, 120, 132, 144,
156, 180, 204, 240,
280, 300, 360

2.6-2.6/1.3

3.3-3.3/1.6

5.9-5.9/2.9

*Optional variable speed switch is available.
**These motors are without thermal overload protection.
†230/1/60 unit has 115/1/60 motor supplied with field installed stepdown transformer.
Note 1:
All motors are constant speed and operate at top speed as indicated in motor data. Models 18 through 108, including A08, A18, A25 and A36 can be run
at reduced speed with addition of optional variable speed switch. This switch is factory-calibrated for low and high speed ratings, with intermediate speeds
infinitely controllable. Models 120 through 360 operate at constant speed as indicated in motor data. All 1/4 H.P. motors are P.S.C.
Note 2:
Motors under 1/3 H.P. are totally enclosed, frame mounted, 115/1/60 with thermal overload protection and permanently lubricated sleeve bearings with
optional speed controller available. 1/3 H.P. (115/1/60) motors are open frame constant speed with thermal over-load protection and ball bearings. 1/3
H.P. (230V) and 1/2 H.P. (230V) motors are open frame constant speed with thermal overload protection and ball bearings.
Note 3:
1/3 and 1/2 H.P. motors are available as 230V single and 3 phase in open frame and explosion-proof housings, all available as options. 1/3 and 1/2 H.P.
motors operate at single speed only.
Note 4:
Stated AMP draw is Full Load Amp (FLA). AMP draw varies by motor manufacturer ± .2 AMPS. Verify FLA per unit motor data plate.

UH-PRC001-EN

27

Performance Data

Table 24.

Explosion Proof with Thermal Overload Motor Type

S Unit Model No.

AMP

MCA

MOP

HP

RPM

115/1/60
48, 60, 72, 84, 96,
108, 120, 132

3.7

4.6

8.3

1/6

1140

144, 156, 180, 204

5.4

6.8

12.2

1/4

1140

240, 280, 300

7.4

9.3

16.7

1/3***

1140

360

7.4

9.3

16.7

1/2***

1140

48, 60, 72, 84, 96,
108, 120, 132

3.7

4.6

8.3

1/6†

1140

230/1/60

144, 156, 180, 204

5.4

6.8

12.2

1/4†

1140

240, 280, 300

3.7

4.7

8.3

1/3***

1140

360

3.7

4.7

8.3

1/2***

1140

1/3

1140

230/460/3/60/TE
144, 156, 180, 204,
240, 280, 300, 360

2.2/1.1

2.8/1.4

5.0/2.5

*Optional variable speed switch is available.
**These motors are without thermal overload protection.
***These motors are 115/230 volts.
†230/1/60 unit has 115/1/60 motor supplied with field installed stepdown transformer.
Note 1:
Models 120 through 360 operate at constant speed as indicated in motor data. All 1/4 H.P. motors are P.S.C.
Note 2:
Motors under 1/3 H.P. are totally enclosed, frame mounted, 115/1/60 with thermal overload protection and permanently lubricated sleeve bearings with
optional speed controller available. 1/3 H.P. (115/1/60) motors are open frame constant speed with thermal over-load protection and ball bearings. 1/3
H.P. (230V) and 1/2 H.P. (230V) motors are open frame constant speed with thermal overload protection and ball bearings.
Note 3:
1/3 and 1/2 H.P. motors are available as 230V single and 3 phase in open frame and explosion-proof housings, all available as options. 1/3 and 1/2 H.P.
motors operate at single speed only.
Note 4:
Stated AMP draw is Full Load Amp (FLA). AMP draw varies by motor manufacturer ± .2 AMPS. Verify FLA per unit motor data plate.

28

UH-PRC001-EN

Performance Data

Vertical Unit Heaters
Table 25.

Totally Enclosed Motor Type

P Unit Model No.

AMP

MCA

MOP

HP

RPM

115/1/60
42

1.23**

1.6

2.8

1/40*

1550

64, 80

2.1**

2.6

4.7

1/20*

1550

102

1.2**

1.5

2.7

1/8*

1070

2.3**

2.9

5.2

1/6

1100

202

3.6**

4.5

8.1

1/4

1100

252

3.6**

4.5

8.1

1/4

1100

280

5.4**

6.8

12.2

1/2

1100

122
146
166

208-230/460/3/60
42

0.98-1.1/0.55

1.2-1.4/0.7

2.2-2.5/1.2

1/6

1140

64, 80

0.98-1.1/0.55

1.2-1.4/0.7

2.2-2.5/1.2

1/6

1140

102

0.98-1.1/0.55

1.2-1.4/0.7

2.2-2.5/1.2

1/6

1140

0.98-1.1/0.55

1.2-1.4/0.7

2.2-2.5/1.2

1/6

1140

202

1.2-1.4/0.7

1.5-1.8/0.9

2.7-3.2/1.6

1/4

1140

252

1.2-1.4/0.7

1.5-1.8/0.9

2.7-3.2/1.6

1/4

1140

280

1.8-2.0/1.0

2.3-2.5/1.3

4.1-4.5/2.3

1/2

1140

336, 384

3.1-3.2/1.6

3.9-4.0/2.0

7.0-7.2/3.6

3/4

1140

500, 600

5.3-5.0/2.5

6.6-6.3/3.1

11.9-11.3/5.6

1-1/2

1160

720

9.9-9.8/4.9

12.4-12.3/6.1

22.3-22.1/11.0

3

1165

42, 64, 80, 102, 122,
146, 166, 202, 252

0.6

0.8

1/3

1140

122
146
166

575/3/60
1.4

280

0.8

1.0

1.8

1/2

1140

336, 384

1.3

1.6

2.9

3/4

1140

500, 600

2.0

2.5

4.5

1-1/2

1160

720

3.8

4.7

8.6

3

1165

* Optional variable speed switch is available.
** These motors have automatic thermal overload protection or impedance protection.
Note 1:
All motors are constant speed and operate at top speed as indicated in motor data. Models through 1/8 H.P. can be run at reduced speed with addition of
optional variable speed switch. This switch is factory-calibrated for low and high speed ratings, with intermediate speeds infinitely controllable. Models 166
through 720 operate at constant speed as indicated in motor data.
Note 2:
Stated draw is Full Load (FLA). AMP draw varies by motor manufacturer ± .2 AMPS.

UH-PRC001-EN

29

Performance Data

Table 26.

Explosion Proof with Thermal Overload Motor Type

P Unit Model No.

AMP

MCA

MOP

HP

RPM

115/1/60
42

3.8

4.8

8.6

1/6

1140

64, 80

3.8

4.8

8.6

1/6

1140

102

3.8

4.8

8.6

1/6

1140

3.8

4.8

8.6

1/6

1140

202

4.4

5.5

9.9

1/4

1140

252

4.4

5.5

9.9

1/4

1140

280

7.8

9.8

17.6

1/2

1140

122
146
166

208-230/460/3/60
42

1.0-1.0/0.5

1.3-1.3/0.6

2.3-2.3/1.1

1/6

1140

64, 80

1.0-1.0/0.5

1.3-1.3/0.6

2.3-2.3/1.1

1/6

1140

102

1.0-1.0/0.5

1.3-1.3/0.6

2.3-2.3/1.1

1/6

1140

1.0-1.0/0.5

1.3-1.3/0.6

2.3-2.3/1.1

1/6

1140

202

1.1-1.1/0.55

1.4-1.4/0.7

2.5-2.5/1.2

1/4

1140

252

1.1-1.1/0.55

1.4-1.4/0.7

2.5-2.5/1.2

1/4

1140

122
146
166

280

1.9/0.95***

2.4/1.2

4.3/2.1

1/2

1140

336, 384

3.1-3.2/1.6

3.9-4.0/2.0

7.0-7.2/3.6

3/4

1145

500, 600

5.0/2.5

6.5/3.3

11.3/5.6

1-1/2

1150

700

10.0/5.0***

12.5/6.3

22.5/11.3

3

1150

*** These motors are 230/460 volts only.
Note 1:
Models 166 through 720 operate at constant speed as indicated in motor data.
Note 2:
Stated draw is Full Load (FLA). AMP draw varies by motor manufacturer ± .2 AMPS.

30

UH-PRC001-EN

Wiring Diagrams
Wiring Diagrams

WARNING

1 PHASE LINE

1 PHASE LINE

Hazardous Voltage

Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power before servicing could result
in death or serious injury.

MOTOR
SPEED
CONTROLLERS

Hazardous Voltage

1.

2.

For internal wiring and overload
protection on all starters, consult
the control manufacturer for
details.
When using thermostatic control
with a manual starter, be sure
that the electrical rating of the
thermostat is sufficient to carry
the motor current.

Note:

Refer to the Motor
Characteristics-portion of the
Performance Data chapter for
motor characteristics of
Individual Unit Heaters

ROOM THERMOSTAT

THERMOSTATIC CONTROL
WITH MANUAL STARTER

MANUAL STARTING
SWITCH

SPEED CONTROLLERS WITH
MAGNETIC STARTING SWITCH
FOR OPERATING SEVERAL UNITS

Figure 12.

Figure 9.
3 PHASE LINE
1 PHASE LINE

MAGNETIC
STARTING SWITCH

MANUAL STARTING
SWITCH

THERMOSTAT
MOTOR

MOTOR

MOTOR

MANUAL CONTROL WITH
THREE PHASE MOTOR
THERMOSTATIC CONTROL
USING MAGNETIC STARTER
OPERATING SEVERAL UNITS

Figure 10.

1 PHASE LINE

THERMOSTAT
MOTORS

WARNING

Do not use any tools (i.e.
screwdriver, pliers, etc.) across the
terminals to check for power. Use a
voltmeter. Failure to disconnect
power before servicing could result
in death or serious injury.

MAGNETIC
STARTING SWITCH

MANUAL STARTING
SWITCH

Figure 13.

3 PHASE LINE

MAGNETIC
STARTING SWITCH

1 PHASE LINE

THERMOSTAT
MOTORS

MOTOR

MANUAL STARTING
SWITCH
THERMOSTAT

MANUAL CONTROL WITH
SINGLE PHASE MOTOR

Figure 8.

SPEED CONTROLLER

MOTOR

THERMOSTATIC CONTROL
OF SEVERAL THREE PHASE UNITS

Figure 14.
SPEED CONTROLLER WITH
MANUAL STARTING SWITCH

Figure 11.
UH-PRC001-EN

31

Dimensional Data
Dimensional Data: P Model
H

H

K

K
V

G

A

R

R

G

R

A
(4) MOUNTING HOLES 3
/8 - 16 FOR 42P-80P
THREAD TAPS

CEILING
P
L
F

T

STEAM
SUPPLY
OR
HOT WATER
RETURN

B
S

STEAM
RETURN
OR
HOT WATER
SUPPLY

C

T
E
P
D

Figure 15.

Table 27.

Models 42-80

Roughing in Dimensional Data - Model Size 42-80

Unit Capacity (MBH)

Fan Dia.

042

11 1/4

18 1/4 4 5/8 1 1/4 11 3/4 3/4 4 11 1 3/8 1 7/8

7

1 1/2

3 5/8 6 5/8 2 3/4 11 3 5/8

064

13 1/2

21 1/4 4 5/8 1 5/8

14

1

4 14 1 3/8 1 7/8

7

1 1/2

3 5/8 7 1/8 2 3/4 14 3 5/8

080

13 1/2

21 1/4 6 1/8 1 5/8

14

1

3 14 1 3/8 1 7/8

7

1 1/2

3 5/8 8 5/8 2 3/4 14 3 5/8

32

A

B

C

D

E

F

G

H

K

L (Min.) P (NPT)

R

S

T

U

V

UH-PRC001-EN

Dimensional Data

K
H
H
V

A

K

U

V

R

G

R

A
(4) MOUNTING HOLES 3/8 - 16 FOR 102P-384P
THREAD TAPS 1/2 - 13 FOR 500P-720P

CEILING
P

STEAM
SUPPLY
OR
HOT WATER
RETURN

L
F

T

B
S
C

STEAM
RETURN
OR
HOT WATER
SUPPLY

T
E
P
D

Figure 16.

Table 28.

Models 102-720

Roughing in Dimensional Data - Model Size 102-720

Unit
Capacity
(MBH)

Fan
Dia.

102

16 3/4

25 1/4 6 1/8

2

122

16 3/4

25 1/4 6 1/8

2

146

L
(Min.)

P
(NPT)

R

S

T

U

V

1 3/8 2 3/4

7

1 1/2

4 1/8

9 1/8

2 3/4

17

4 1/8

1 3/8 2 3/4

7

1 1/2

4 1/8

9 3/4

2 3/4

17

4 1/8

4

20 1/2 1 3/4 3 1/2

7

2

4 1/2

9 5/8

2 3/4 20 1/2 4 1/2

4

20 1/2 1 3/4 3 1/2

7

2

4 1/2 10 1/8 2 3/4 20 1/2 4 1/2

2

4

20 1/2 1 3/4 3 1/2

7

2

4 1/2

1

3 1/2

28

1 3/4 3 1/2

7

2

4 3/4 11 5/8 2 3/4

18

3

26 3/8 1 1/4 3 1/2

28

1 3/4 3 1/2

7

2

4 3/4 11 3/4 2 3/4

18

9 3/4

37 1/2 7 5/8

3

26 3/8 2 1/8

28

1 3/4 3 1/2

7

2

4 3/4 12 3/4 2 3/4

18

9 3/4

37 1/2 9 1/8

3

26 3/8

7

2

4 3/4 14 1/8 2 3/4

18

9 3/4

7

2 1/2

6

14 1/4

3

30

6

7

2 1/2

6

17 3/4

3

30

6

7

2 1/2

6

20 1/4

3

30

6

F

G

17 1/2 1 1/8

3

17

17 1/2 1 3/4

3

17

19 3/4

29 1/2 6 1/8 2 3/8 20 5/8 1 1/4

166

19 3/4

29 1/2 6 1/8 2 3/8 20 5/8 1 3/4

202

19 3/4

29 1/2 7 5/8 2 3/8 20 5/8

252

25 1/4

37 1/2 7 5/8

3

26 3/8

280

25 1/4

37 1/2 7 5/8

336

25 1/4

384

25 1/4

3 1/2

28

1 3/4 3 1/2

500

30

42

9 1/8 3 1/2 31 1/4 1 5/8

3

30

2 1/4 4 1/4

600

30

42

12 1/8 3 1/2 31 1/4 2 1/8

3

30

2 1/4 4 1/4

720

30

42

13 5/8 3 1/2 31 1/4

4

30

2 1/4 4 1/4

UH-PRC001-EN

A

B

C

D

E

2

3

4

H

K

12

2 3/4 20 1/2 4 1/2
9 3/4

33

Dimensional Data

Table 29.

Louver Cone Diffuser Roughing in Dimensions

Unit Size

A

B

C

D

No. of Louvers

42
64 & 80

16 1/2
20

14 1/4
17

6 1/2
8

2 5/8
3 1/8

8
8

102 & 122
146, 166 & 202

24 1/4
28 3/8

21
24 3/4

9 3/4
11 1/2

3 15/16
4 5/8

8
8

252, 280, 336, & 384 35 1/2
500, 600 & 720
41 1/2

31 1/2
37 1/4

13 3/4
17

4
4 3/4

12
12

Dimensional Data: S Model

Figure 17.
Note:

Serpentine Type Models A08, A18, A25, A36

Motors are totally enclosed,
thermally protected, sleeve
bearing, with 4" (w) x 2" (h)
conduit connection boxes.
Nutserts are attached to
enclosure for balanced
hanging.

Table 30.

Serpentine Models

MODEL

H

W

A

B

C

NO. OF
LOUVERS

NOM. FAN
DIAM.

APPROX.
SHIP WT.

A08

16

18

16 7/32

11 1/4

4 1/4

5

9

22

A18

16

18

16 7/32

11 1/4

4 1/4

5

10

24

A25

16

18

16 7/32

11 1/4

4 1/4

5

10

25

A36

18 1/2

20 1/2

18 23/32

13 3/4

5 1/8

6

12

31

34

UH-PRC001-EN

Dimensional Data

Figure 18.

Table 31.

Header Type Models 18 thru 360

Models S-18 Thru 360 (Header Type)

J

A

B

C

D

G*

H*

14 5/8

7 5/16

15

7 1/2

6 1/8 2 15/16

3 1/4

9 3/8

12 1/4 9 1/2

1 1/4

2 1/4 12 7/8

4

9

26

S-24
S-36

14 5/8

7 5/16

18

9

6 1/8 2 15/16

3 1/4

9 3/8

12 1/4 12 1/2 1 1/4

2 1/4 12 7/8

5

10

30

S-48
S-60

17 1/8

8 9/16

20 1/2 10 1/4

1 1/4

1 3/4 15 3/8

6

12

41

S-72

18 3/8

9 3/16

21 3/4 10 7/8

16 1/4 1 1/4

1 3/4 16 5/8

7

14

44

S-84

20 7/8 10 9/16 24 1/4 12 1/8

6 1/8 2 15/16 5 11/16 11 13/16 18 1/2 18 3/4 1 1/4

1 3/4 19 1/8

8

14

47

1 3/4 17 7/8

8

16

49

5 7/8 2 15/16 5 1/16 10 15/16 14 3/4
6

2 15/16 5 1/16

7 1/2

16

15

L

13 13/16 17 1/4 17 1/2 1 1/2

M

N

S-96
S-108

19 5/8 9 13/16

S-120

20 7/8 10 7/16 25 1/4 12 5/8 6 5/16 3 3/16 6 11/16

13

1 3/4 19 1/8

8

18

59

S-132
S-144

23 3/8 11 11/16 27 3/4 13 7/8 6 5/16 3 3/16

7 5/8

14

21

21 1/4 1 1/2

1 3/4 21 5/8

9

18

74

S-156

23 3/8 11 11/16 27 3/4 13 7/8 6 5/16 3 3/16

7 7/16

13 3/4

21

21 1/4 1 1/2

1 3/4 21 5/8

9

18

74

S-180
S-204

24 5/8 12 5/16

14 1/2

6 3/8

3 3/16

7 7/16

13 3/4

22 1/4 22 1/2 1 1/2

1 3/4 22 7/8

9

18

90

S-240

27 7/8 13 15/16 30 1/4 15 1/8

8 1/8

3 3/16

5 7/8

14

25 1/2 23 3/4

2

1 3/4 26 1/8

10

20

125

S-280

27 7/8 13 15/16 30 1/4 15 1/8

8 1/8

3 3/16

9-5/8

17 3/4

25 1/2 23 3/4

2

1 3/4 26 1/8

10

20

118

S-300
S-360

33 3/8 16 11/16 37 3/4 18 7/8

9

3 3/16

9 5/8

18 5/8

2

1 3/4 31 5/8

13

24

154

29

6 5/16 3 3/16

11 1/16

K

APPROX.
SHIP
WT.

S-18

12

F

NOM.
FAN
DIAM.

MODEL

24

E

NO.
OF
LOUVERS

18 1/2 18 3/4 1 1/2

31

31 1/4

* Applies to standard motor with standard fan guard. When optional motors or OSHA fan guards are requested, dimensions will change according to the
substitutions made.
NOTES
1. Standard motor and standard guard shown.
2. Optional OSHA guards available for all units with 1 phase motors.
3. All 3 phase and explosion proof motors are shelf mounted.

UH-PRC001-EN

35

Mechanical Specifications
Horizontal Specifications
General
Furnish and install, where indicated
or scheduled on plans Model S
horizontal steam/hot water unit
heaters. Unit shall be equipped as
specified herein. All units shall be
installed in a neat and workmanlike
manner in accordance with this
specification and the manufacturer's
installation instruction.

saturated steam pressure at 366°F,
under maximum load conditions. We
recommend operating pressure of 75
P.S.I. at 320°F for long life.

Motors
Motors are totally enclosed, resilient
mounted with class “B” windings.
All motors are designed for
horizontal mounting. Motors under
1/3 H.P. are totally enclosed, frame
mounted, 115/1/60 with thermal
overload protection and
permanently lubricated sleeve
bearings with optional solid state
speed controller available. 1/3 H.P.
(115/1/60) motors are open frame
construction, with thermal overload
protection and ball bearings. 1/3 H.P.
at (230V) and1/2 H.P. (230V) motors
are open frame construction, with
thermal overload protection and ball
bearings. 1/3 and 1/2 H.P. motors are
available in single and 3 phase in
open frame construction or
explosion-proof housings, all the
above are available as options.

Fan Guards
Fan guards are welded steel, zinc
plated or painted. To meet CSA and
OSHA requirements, units mounted
below 8 feet from floor must be
equipped with an OSHA fan guard.
OSHA fan guards are optional.

Air Deflection Louvers
Units are equipped with horizontal,
individually adjustable louvers. An
optional vertical louver is available
for four-way air control.

Serpentine Coil Specifications
General
Furnish and install, where indicated
or scheduled on plans Model S-A
horizontal hot water unit heaters.
Unit shall be equipped as specified
herein. All units shall be installed in
a neat and workmanlike manner in
accordance with this specification
and the manufacturer's installation
instruction.

Explosion Proof Motors

Casing
Casings are fabricated from 20
gauge die-formed steel. Casing
substrates are prepared for finishing
with a hot wash, iron phosphatizing
clear rinse, chromic acid rinse and
oven drying. Paint finish is leadfree,
chromate free, alkyd melamine resin
base and applied with an
electrostatic two-pass system. Finish
is baked at 350°F.

Coil Models 18 – 360
Coil elements and headers are heavy
wall drawn seamless copper tubing.
Element tubes are brazed into
extruded header junctions. Pipe
connection saddles are cast bronze.
Aluminum fins have drawn collars to
assure permanent bond with
expanded element tubes and exact
spacing. All Element Assemblies are
submersion tested at factory at 250
P.S.I., and are rated at 150 pounds of
36

An enclosed motor whose enclosure
is designed and constructed to
withstand an explosion of a specific
gas or vapor which may occur within
the motor and to prevent the ignition
of this gas or vapor surrounding the
machine.
Motors comply with the National
Electrical Code classification as
follows:
Class I, Group D; all sizes
Class II, Group F; all sizes
Class II, Group G; all sizes
Division I & II Installations
T-code (T3B)
Explosion proof equipment is not
generally available for Class I,
Groups A and B and it is necessary
to isolate motors from the hazardous
area. All explosion proof motors are
shelf mounted.

Fans
Fans are aluminum blade, hub type
designed and balanced to assure
maximum air delivery, low motor
horsepower requirements and quiet
operation. Blades are spark proof.

Casing
Casings are fabricated from 20
gauge die-formed steel. Casing
substrates are prepared for finishing
with a hot wash, iron phosphatizing
clear rinse, chromic acid rinse and
oven drying. Paint finish is leadfree,
chromate free, alkyd melamine resin
base and applied with an
electrostatic two-pass system. Finish
is baked at 350°F.

UH-PRC001-EN

Mechanical Specifications

Coil Models S-A08– S-A36
Coil is a serpentine design with
seamless copper tubing. Aluminum
fins have drawn collars to assure
permanent bond with expanded
tubes. Tubing connection are 3/8"
copper tubing, type “M” (.500 O.D.).
Coils are factory tested at 250 P.S.I.

Motors
Motors are totally enclosed, resilient
mounted with class “B” windings. All
motors are designed for horizontal
mounting.

Fans
Fans are aluminum blade type,
designed and balanced to assure
maximum air delivery, low motor
horsepower requirements and quiet
operation.

Fan Guards
Fan guards are welded steel, zinc
plated or painted. To meet CSA and
OSHA requirements, units mounted
below 8 feet from floor must be
equipped with an OSHA fan guard.
OSHA fan guards are optional.

Air Deflection Louvers
Units are equipped with horizontal,
individually adjustable louvers.

Vertical Specifications
General
Furnish and install, where indicated
or scheduled on plans Model P
vertical steam/hot water unit heaters.
Unit shall be equipped as specified
herein. All units shall be installed in
a neat and workmanlike manner in
accordance with this specification
and the manufacturer's installation
instruction.

Casing
Casing is formed by two square steel
plates. Bottom plate forms orifice for
air delivery. Air ports stamped in top
plate as standard for easy removal
for low final air temperature.

Coil
Hot water/steam coils are rectangular
3 or 4-sided, one-pass, multiple
circuit, with aluminum Sigma-Flow
(there should be a registered sign
UH-PRC001-EN

after Sigma-Flow) fins mechanically
bonded to tubes. Standard coils are
tested at 375 psi under water. Supply
and return connections are steel
pipe. Standard coils have .025
copper tubing suitable for use on
steam pressure to 75 psi or hot water
up to 225 psi or 325 F. Optional .049
steel tubing is suitable for use for 450
F water at 400 psi.

Motors
Standard motors are 115/60/1, totally
enclosed, with thermal overload
protection for all units through size
280P. Standard motors for 42P, 64P
and 80P are shaded pole, sleeve
bearing. The 102P motor is
permanent split capacitor type with
sleeve bearings. Motor for unit sizes
122P through 280P are permanent
split capacitor types with
permanently lubricated ball bearings.
Motors used unit sizes 336P through
720P are 230/460/60/3, totally
enclosed, with permanently
lubricated ball bearings. Unit sizes
smaller than 336 are also available
with 230/460/60/3 motors.
All motors fraction hp and integral
hp, have Class "B" insulation. The
115/60/1 motors used as standard on
unit sizes 42P through 102P can be
operated at multiple speeds with the
addition of a solid-state speed
control.

Explosion Proof Motors
An enclosed motor whose enclosure
is designed and constructed to
withstand an explosion of a specific
gas or vapor which may occur within
the motor and to prevent the ignition
of this gas or vapor surrounding the
machine. All units are available with
1140 rpm explosion-proof motors.

Fan
Fans are aluminum blade designed
and balanced for quiet operation.
Blades are spark proof.

Louver Cone Diffuser
Optional louver cone diffuser is
available for complete versatility in
air diffusion patterns. Adjustable 18gauge steel blades are held in set
position by spring steel clips.

37

Literature Order Number

Trane
A business of American Standard Companies
www.trane.com
For more information, contact your local Trane
office or e-mail us at comfort@trane.com

UH-PRC001-EN

Date

August 2007

Supersedes

UH-PRC001-EN October 1999

Trane has a policy of continuous product and product data improvement and reserves the right to
change design and specifications without notice.



---

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Modify Date                     : 2007:09:28 13:22:07Z
Format                          : application/pdf
Description                     : S&P Catalog
Creator                         : R. L. Burkhead
Title                           : UH-PRC001-EN
Copyright                       : © 2007 American Standard All rights reserved
Keywords                        : Vertical and Horizaontal Steam and Hot Water Unit Heaters
Producer                        : Acrobat Distiller 7.0.5 (Windows)
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Page Count                      : 38
Subject                         : S&P Catalog
Author                          : R. L. Burkhead

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