LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806500

User Manual: LENNOX LENNOX Air conditioner/heat pump(outside unit) Manual LENNOX Air conditioner/heat pump(outside unit) Owner's Manual, LENNOX Air conditioner/heat pump(outside unit) installation guides

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,?c 2008

lennox

INSTALLATION
INSTRUCTIONS

'
'
•
Industr_es
Inc

Datias,

Texas,

USA

S'ClassTM SPB*H4 Units
SPB036H4S41,
SPB060H4S41
HEAT PUMPS
505,330M

SPB048H4S41

and

_
Technical
LLL[ Publications

02/08

Litho U.S.A.

Supersedes 06/07

RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE

Xk WARNING

CAUTION

IMPORTANT

Shipping and Packing List ......................
SPB*H4 Outdoor Unit ..........................
Unit Dimensions ..............................
General Information ...........................
Recovering Refrigerant from Existing System .....
Removing Existing Outdoor Unit .................
Positioning New Outdoor Unit ...................
Removing and Installing Panels .................
New or Replacement Line Set ...................
Brazing Connections ...........................
Removing Indoor Unit Metering Device ...........
Flushing the System ...........................
Installing New Indoor Unit Metering Device ........
Testing for Leaks ..............................
Evacuating the System .........................
Servicing Unit Delivered Void of Charge ...........
Electrical Connections .........................
Start-Up and Charging Procedures ...............
System Operation .............................
Defrost System ...............................
Maintenance ..................................
Optional Accessories ..........................
Owner Information .............................
Thermostat Operation ..........................
Start-Up and Performance Checklist .............

Check unit for shipping damage. Consult
immediately if damage is found.
1 -Assembled SPB*H4 outdoor unit

IMPORTANT

1
1
2
3
5
6
6
7
9
10
11
12
13
13
15
16
16
18
21
21
26
26
27
28
28

last carrier

The SPB*H4 Heat Pumps, which will also be referred to in
this instruction as the outdoor unit, uses HFC-410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
SPB*H4 Engineering Handbook.
This outdoor unit is designed for use in systems that use
check thermal expansion valve (CTXV) refrigerant
metering devices.

02/08

IIIHIIIIIIIIIIIHIIIIIIIIIIIIIIIIII

Page 1

505,330M

IIIIIIIIIIIIIIIIIIIIIIIII

RUN
CAPACITOR

OUTDOORFAN

CONTACTOR

COMPRESSOR

REVERSING
VALVE

SUCTION LINE
• CONNECTION

LIQUID LINE
CONNECTION

DEFROST
BOARD

HIGH PRESSURE
SWITCH

FILTER DRIER/
LIQUID LINE
CONNECTIONS

VAPOR LINE
VAPOR VALVE AND
GAUGE PORT/SUCTION
LINE CONNECTIONS

TOP VIEW
SPB*H4 PARTS ARRANGEMENT
C
DISCHARGE AIR

LIQUID LINE

--CONNECTION
ELECTRICAL
INLETS

VAPORLINE
JCONNECTION
2 (51)

SIDE VIEW

4_1/4(1
08)

4_8/4
(121)

1 (25)

SIDE VIEW

-T

0N'TSUPPORTFEET\
O __F
13-7/8

(352)

20-5/8
(524)

7-3/4
(197)

4-1/2

(114)

--T

3-1/4
(83)

3-5/8

(689)

(92)

BASE WITH ELONGATED
B

LEGS

Model

SPB*H4-036

35 (889)

30-1/2 (775)

35 (889)

17-5/8 (448)

8-3/4 (222)

18 (457)

SPB*H4-048

45 (1143)

30-1/2 (775)

35 (889)

27-5/8 (702)

8-3/4 (222)

18 (457)

9 (229)

11-1/2 (292)

9 (229)

11-1/2 (292)

SPB*H4-060

39 (991)

30-1/2 (775)

35 (889)

27-5/8 (702)

11 (222)

18 (457)

10-1/2 (267)

13-1/2 (343)

10-1/2 (267)

13-1/2 (343)

Page 2
505330M

02/08

G
9 (229)

8-1/2 (216)

9 (229)

11-1/2 (292)

OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging,

WARNING

Each valve is equipped with a service port which has a
factory-installed valve stem.

IMPORTANT

1/12 TURN

I/6 TURN

These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.

9
8

When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 shows
torque values for fasteners.
Table 1. Torque Requirements
Parts

Recommended

Service valve cap

8 ft.- lb.

11 NM

Sheet metal screws

16 in.- lb.

2 NM

Machine screws #10

28 in.- lb.

3 NM

Compressor bolts

90 in.- lb.

10 NM

Gauge port seal cap

8 ft.- lb.

11 NM

Figure 1 Cap Tightening

Torque

Distances

IMPORTANT

To Access Angle-Type Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal,

USING MANIFOLD GAUGE SETS
When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.
See figure 2 for a typical manifold gauge connection setup,

1. Remove service port cap with an appropriately sized
wrench.

Manifold gauge sets used with HFC-410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 - 800 on the high side and a low side of
30" vacuum to 250 psi with dampened speed to 500 psi.
Gauge hoses must be rated for use at up to 800 psi of
pressure with a 4000 psi burst rating,

3. When testing is completed, replace service port cap and
tighten as follows:
• With Torque Wrench: Finger tighten and then
tighten per table 1,
• Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 1.

2. Connect gauge to the service port,

Page 3
SPB*H4

SERIES

DISTRIBUTOR

CBECK
EXPANSION

VALVE

REV S' :UV E

\
NOTE - ARROWS
OF REFRIGERANT

LOW
PRESSURE

DR,ER O% tOR
HIGH

INDICATE
FLOW.

DIRECTION

MUFFLER

PRESSURE

___

;g2

INDOOR UNIT

]

V'A;°2
_

CHECK

EXPANSION

VALVE -INDOOR
COIL

Figure 2. Typical Manifold Gauge Connection Setup
To Open and CloseAngle-TypeService Valve:
A valve stem cap protects the valve stem
contamination and assures a leak-free seal.

from

NOTE- To prevent stripping of the cap, the wrench should
be appropriately sized and fit snugly over the cap before
tightening the cap.

1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex-head extension
(3/16" for liquid-line valve sizes and 5/16" for
vapor-line valve sizes) to back the stem out
counterclockwise as far as it will go.
3. Replace the stem cap and tighten as follows:
• With Torque Wrench: Tighten finger tight and then
tighten per table 1.
• Without Torque Wrench: Finger tighten and use an
appropriately sized wrenched to turn an additional
1/12 turn clockwise as illustrated in figure 1.
SERVICE

SERVICE

PORT

//_/_

SERVICE

(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE

STEM

CAP

CLOSED)
WRENCH

INSERT HEX
HERE

UNIT

Figure 4. Angle-Type Service Valve
(Back-Seated Opened)

(VALVE
STEM
SBOWN

To Access Bali-Type Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
1. Remove service port cap with an appropriately sized
wrench.

TO INDOOR
UNIT

UNIT J

2. Connect gauge to the service port.
3. When testing is completed, replace service port cap and
tighten as follows:

CLOSED TO BOTH INDOOR
AND OUTDOOR UNITS

Figure 3. Angle-Type Service Valve
(Font-Seated Closed)
NOTE - A label with specific torque requirements may be
affixed to the stem cap. If the label is present, use the
specified torque.

Page 4
02/08

PORT

TO INDOOR
UNIT

PORT

FRONT-SEATED

505330M

SERVICE

AND
UNITS

TO OUTDOOR

CORE

TO OUTDOOR

PORT
CORE

PORT

_L_

CAP

OPEN TO BOTH
INDOOR
OUTDOOR

CAP_-_

SERVICE

PORT

•

With Torque Wrench:
tighten per table 1.

Finger tighten and then

•

Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 1.

TO INDOOR

UNIT
RECOVERY

OPEN TO LINE SET WHEN VALVE IS CLOSED,
TO BOTH LINE SET AND UNIT WHEN VALVE IS
OPEN.

TO OPEN ROTATE STEM
COUNTERCLOCKWISE
90° .

MACHINE

MANIFOLD

GAUGES

BALL (SHOWN
CLOSED)

TO CLOSE ROTATE STEM
CLOCKWISE
90 ° .

VALVE
STEM

CORE
SERVICE

PORT

CAP
OUTDOOR

TO OUTDOOR

STEM

UNIT

CAP

Figure 6. Typical Refrigerant Recovery
(Method 1)

Figure 5. Bali-Type Service Valve
To Open and Close Bali-TypeService Valve:
A valve stem cap protects the valve stem
contamination and assures a leak-free seal.

from

1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open. To open
valve, roate stem counterclockwise 90 °, To close
rotate stem clockwise 90 °.
3. Replace the stem cap and tighten as follows:
• With Torque Wrench:
tighten per table 1.

Finger tighten and then

• Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/12 turn clockwise as illustrated in figure 1.
NOTE - A label with specific torque requirements may be
affixed to the stem cap. If the label is present, use the
specified torque.

NOTE - Use recovery machine instructions for specific
setup requirements.
METHOD 2:
Use this method if the existing outdoor unit is equipped
with manual shut-off valves, and plan on using new
HCFC-22 refrigerant to flush the system.
IMPORTANT: Some system configurations may contain
higher than normal refrigerant charge due to either large
internal coil volumes, and/or long line sets. The following
conditions may cause the compressor to stop functioning:
The following devices could prevent full system charge
recovery into the outdoor unit:
•

Outdoor unit's high or low-pressure switches (if
applicable) when tripped can cycled the compressor
OFF.

•

Compressor can stop pumping due to tripped internal
pressure relief valve.

•

Compressor has internal vacuum protection that is
designed to unload the scrolls (compressor stops
pumping) when the pressure ratio meets a certain
value or when the suction pressure is as high as 20
psig. (Compressor suction pressures should never be
allowed to go into a vacuum. Prolonged operation at
low suction pressures will result in overheating of the
scrolls and permanent damage to the scroll tips, drive
bearings and internal seals).

Remove existing HCFC-22 refrigerant using one of the
following procedures:
METHOD 1 :
If the existing outdoor unit is not equipped with shut-off
valves, or if the unit is not operational and you plan to use
the existing HCFC-22 to flush the system.
NOTE - Use recovery machine instructions
setup requirements.

UNIT

for specific

Once the compressor can not pump down to a lower
pressure due to one of the above system conditions, shut
off the suction valve. Turn OFF the main power to unit and
use a recovery machine to recover any refrigerant left in
the indoor coil and line set.
Perform the following task:

1. Disconnect all power to the existing outdoor unit.
2. Connect to the existing unit a gauge set, clean
recovery cylinder and a recovery machine. Use the
instructions provided with the recovery machine on
how to setup the connections.
3. Remove all HCFC-22 refrigerant from the existing
system. Check gauges after shutdown to confirm that
the entire system is completely void of refrigerant.

1. Start the existing HCFC-22 system in the cooling
mode and close the liquid line valve.
2. Pump as much of the existing HCFC-22 refrigerant
with the compressor back into the outdoor unit until
you have reached the limitations of the outdoor
system. Turn the outdoor unit main power OFF and
use a recovery machine to remove the remaining
refrigerant in the system.

Page 5
SPB*H4

SERIES

POSITIONING CONSIDERATIONS
Consider the following when positioning the unit:

NOTE - It may be necessary to bypass the low pressure
switches if equipped to ensure complete refrigerant
evacuation.
3, When the low side system pressures reach 0 psig,
close the suction line valve,

•

4. Check gauges after shutdown to confirm that the
valves are not allowing refrigerant to flow back into the
low side of the system.

When possible, do not install the unit directly outside
a window. Glass has a very high level of sound
transmission, For proper placement of unit in relation
to a window see the provided illustration in figure 8,

Perform the following task at the existing outdoor unit:
•
Disconnect line set at the service valves,
•

Disconnect electrical service at the disconnect switch,

•

Remove old outdoor unit,

Some localities are adopting sound ordinances based
on the unit's sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line,

,NSTALL
UN,T
AWAY

FROM

CAUTION
See Unit Dimensions on page 3 for sizing mounting slab,
platforms or supports, Refer to figure 7 for mandatory
installation clearance requirements,

CONTROL PANEL
ACCESS LOCATION

Figure 8. Outside Unit Placement
PLACING UNIT ON SLAB
When installing unit at grade level, the top of the
should be high enough above grade so that water
higher ground will not collect around the unit. The
should have a slope tolerance as described in figure

* SEE NOTES

BELOW THIS FIGURE

FOR FURTHER

slab
from
slab
9,

NOTE - If necessary for stability, anchor un# to slab as
described in Stabilizing Unit on Uneven Surfaces on page
7,

DETAILS.

Figure 7. Installation Clearances
INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE TOLERANCE
OF 2
DEGREES (OR 2 INCHES PER 5 FEET [80 MM PER 1.5 M]) AWAY FROM BUILDING
STRUCTURE.

NOTES:
•

Service clearance of 30 in. (762 mm) must be
maintained on one of the sides adjacent to the control
box.

•

Clearance to one of the other three sides must be 36
in. (914 mm).

•

__L

Clearance to one of the remaining two sides may be
12 in, (305 mm) and the final side may be 6 in, (152
mm)"

•

48 in. (1219 mm) clearance required on top of unit.

•

A clearance of 24 in, (610 mm) must be maintained
between two units.

02/08

Z-

.
•

_ I

!_'

.m.._l,..._:__--L-

Figure 9. Slab Mounting at Ground Level

Page 6
505330M

BUILDING
STRUCTURE

ELEVATING
THEUNIT
Unlikethesmall-base
unitswhichuseroundsupportfeet,
thelarger-baseunitsareoutfittedwithelongatedsupport
feetasillustratedinfigure10whichusesasimilarmethod
for elevatingthe unit,
If additionalelevationis necessary,raisethe unit by
extendingthelengthoftheunitsupportfeet.Thismaybe
achievedbyusinga2"SCH40femalethreadedadapter,
Thespecifiedcouplingwillfit snugglyintothe recessed
portionofthefeet,Useadditional
2"SCH40malethreaded
adaptorswhichcanbethreadedintothefemalethreaded
adaptorstomakeadditionaladjustments
tothelevelofthe
unit,
NOTE - Keep the height of extenders short enough to
ensure a sturdy installation, If it is necessary to extend
further, consider a different type of field-fabricated
framework that is sturdy enough for greater heights,
BASE

CAUTION

REMOVING PANELS
Remove the Iouvered panels as follows:
1. Remove two screws, allowing the panel to swing open
slightly as illustrated in figure 11,
NOTE - Hold the panel firmly throughout this procedure
2. Rotate bottom corner of panel away from hinge corner
post until lower three tabs clear the slots as illustrated
in figure 11, detail B.
3. Move panel down until lip of upper tab clears the top
slot in corner post as illustrated in figure 11, detail A.
INSTALLING

PANEL

Install the Iouvered panels as follows:
LEG DETAIL

1. Position the panel almost parallel with the unit as
illustrated in figure 12, detail D with the screw side as
close to the unit as possible.

2" (50.8MM)
SCH 40
FEMALE
THREADED
ADAPTER

2. With a continuous motion slightly rotate and guide the
lip of top tab inward as illustrated in figure 11, details
A and C, then upward into the top slot of the hinge
corner post.

Figure 10. Elevated Slab Mounting using
Feet Extenders (Larger Base Units)

3, Rotate panel to vertical to fully engage all tabs,
ROOF MOUNTING
Install unit at a minimum of four inches above the surface
of the roof. Care must be taken to ensure weight of unit is
properly distributed over roof joists and rafters. Either
redwood or steel supports are recommended,

4. Holding the panel's hinged side firmly in place, close
the right-hand side of the panel, aligning the screw
holes.
5. When panel is correctly positioned and aligned, insert
the screws and tighten.

Page 7
SPB*H4

SERIES

PANEL
SHOWN
SLIGHTLY
ROTATED
TO
ALLOW
TOP
TAB
TOEXIT
(OR
ENTER)
TOP
SLOT
FOR
REMOVING
(OR
INSTALLING)
PANEL.
LIP

STABILIZING

UNIT ON UNEVEN SURFACES

To help stabilize an outdoor unit, some installations may
require strapping the unit to the pad using brackets and
anchors commonly available in the marketplace,

Slab Side Mounting
DETAIL A

DETAIL B

ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE
PANEL

DETAIL C

Mounting

IMPORTANT! DO NOT ALLOW PANELS TO HANG
ON UNIT BY TOP TAB. TAB IS FOR ALIGNMENT
AND NOT DESIGNED TO SUPPORT WEIGHT OF
PANEL.

STABILIZING
(18 GAUGE

BRACKET
METAL2"

MINIMUM 1
PER SIDE

REOD,;BENDTOFORM
WIDTH;

HEIGHT

Deck Top

Figure 11. Removing/Installing Louvered
Panels (Details A, B and C)

FOR EXTRA
STABILITY

ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY,
2 BRACKETS PER SIDE, 2" FROM EACH CORNER.
MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE
AS POSSIBLE) WHILE INSTALLING PANEL.

TO PARALLEL

HOLD DOOR

X% M AYBE
TOO
PREFERRED

ANGLE

WITH

THE UNIT

Figure 13. Installing Stabilizer

FIRMLY TO THE HINGED

Brackets

__-------__ FOL , %O E NTAT ,,S
"__

FOR,NSTALLAT,ON

With unit positioned at installation site, remove two side
Iouvered panels to expose the unit base pan. Install the
brackets as illustrated in figures 11 and 12 using
conventional practices; replace the panels after installation
is complete.

A IMPORTANT

Figure 12. Removing/Installing
Panels (Detail D)

Louvered

Page 8
505330M

02/08

This section providesinformationon installationor
replacement
of existinglineset.If linesetarenot being
installed
thenproceed
to Brazing Connections on page 10.

replaced prior to the installation of the SPB*H4 unit.
Typically a liquid line used to meter flow is 1/4" in diameter
and copper.
INSTALLING LINE SET

If refrigerant lines are routed through a wall, seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings, floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds. Also, consider the following when
placing and installing a high-efficiency air conditioner.

Line
Set
procedures,
isolation:

REFRIGERANT

LINE SET

Isolation--This
reference
illustrates
which ensure proper refrigerant line set

•

Installation of a transition
from
vertical is illustrated in figure 14.

•

Installation of line set
illustrated in figure 15,

•

Installation of line set on vertical runs is illustrated in
figure 16.

Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (braze connections) to the indoor unit
coil (flare or sweat connections). Use Lennox L15 (sweat,
non-flare) series line set, or use field-fabricated refrigerant
lines as listed in table 2.

ANCHORED
HEAVY
NYLON
WIRE TIE OR AUTOMOTIVE
MUFFLER-TYPE
HANGER

horizontal

runs

AUTOMOTIVE
MUFFLER-TYPE
HANGER
\

Table 2. Refrigerant Line Set
Field Connections
Model
-018
-024,
-036
-048
-060

Recommended

Liquid
Line

Suction
Line

Liquid
Line

Suction
Line

3/8".
(10 ram)

7/8"
(22 ram)

3/8"
(10 ram)

7/8"
(22 ram)

3/8".
(10 ram)

1-1/8".
(29 ram)

3/8"
(10 ram)

1-1/8"
(29 ram)

Line Set
WALL
STUD

L15 Line
Set
L15-65 15
ft, - 50 ft,
(4.6 m - 15
m)
Field
Fabricated

STRAP

LIQUID LINE

TO SUCTION

LINE

LIQUID LINE
METAL

SLEEVE

kk SUCTION

LINE - WRAPPED

IN ARMAFLEX

NOTE - When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, or contact Lennox Technical
Support Product Applications for assistance. To obtain the
correct information from Lennox, be sure to communicate
the following points:
•

Model (SPB*H4) and size of unit (e.g. -060).

•

Line set diameters for the unit being installed as listed
in table 2 and total length of installation,

Figure 14. Refrigerant Line Set: Transition
from Vertical to Horizontal
WIRE TIE (AROUND
SUCTION LINE
ONLY)
STRAPPING

MATERIAL

(AROUND SUCTION
LINE ONLY)

8 FEET

•

TAPE OR
WIRE TIE

Number of elbows and if there is a rise or drop of the
piping.
STRAP THE SUCTION
LINE TO
THE JOIST OR RAFTER AT 8 FEET

MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET

METAL
SLEEVE

The RFCl-metering line consisted of a small bore copper
line that ran from condenser to evaporator coil. Refrigerant
was
metered
into
the evaporator
by utilizing
temperature/pressure evaporation effects on refrigerant in
the small RFC line. The length and bore of the RFC line
corresponded to the size of cooling unit,
If the SPB*H4 is being used with either a new or existing
indoor coil which is equipped with a liquid line which served
as a metering device (RFCI), the liquid line must be

TAPE OR
WIRE TIE

____'"'"'",',',11
TO HANG LINE SET FROM
MATERIAL OR ANCHORED

INTERVALS
THEN STRAP
THE
LIQUID LINE TO THE SUCTION
LINE.

I HI

JOIST OR RAFTER, USE EITHER METAL
HEAVY NYLON WIRE TIES.

I,,,l
STRAPPING

Figure 15. Refrigerant Line Set: Installing
Horizontal Runs

Page 9
SPB*H4

SERIES

IMPORTANT
_REFRIGERANT
LINES
MUST
NOT
CONTACT
WALL.
LIQUID
LINE
OUTSIDE
WALL
SUCTION
LINE
Use the following procedure to braze the line set to the new
air conditioner unit. Figure 17 is provided as a general
guide for preparing to braze the line set to the air
conditioner unit.

,WARNING
SLEEVE
WIRE
TIE
WOOD
BLOCK
STRAP

WARNING

SUCTION
LINE
WRAPPED
WITH
ARMAFLEX
LIQUID
LINE

WARNING

Figure 16. Refrigerant Line Set: Installing
Vertical Runs (New Construction Shown)

REMOVE CAP AND CORE FROM
BOTH LIQUID AND SUCTION
SERVICE PORTS

CUT AND DEBUR

SERVICE PORT MUST BE
OPEN TO ALLOW EXIT
POINT FOR NITROGEN

INDOOR

SERVICE
VALVE
outdoor
UNIT

UNIT

LIQUtD

LINE

SERVICEJ
VALVE

FLOW NITROGEN

SER

INSTALL CORE ONLY FOR
3OTH SERVICE PORTS after they
have coolED.

VALVE

Figure 17. Brazing Connections
Page 10
505330M

02/08

:RAP

1. Cut ends of the refrigerant lines square (free from
nicks or dents). Debur the ends, The pipe must remain
round, do not pinch end of the line.

•

10 -- Liquid line orifice housings

•

10 -- Liquid line assemblies

2. Remove service cap and core from both the suction
and liquid line service ports.

LIQUID

LINE ORIFICE

3. Connect gauge low pressure side to liquid line service
valve,

4. To protect components during brazing, wrap a wet
cloth around the liquid line service valve body and
copper tube stub and use another wet cloth
underneath the valve body to protect the base paint,
Also, shield the light maroon R-410A sticker.
5. Flow regulated nitrogen (at 1 to 2 psig) through the
refrigeration gauge set into the valve stem port
connection on the liquid line service valve and out of
the valve stem port connection on the suction service
valve.
NOTE- The RFClV or TXV metering device at the indoor
unit will allow low pressure nitrogen to flow through the
system,)
NOTE - Use silver alloy brazing rods with five or six percent
minimum silver afloy for copper-to-copper brazing or 45
percent silver alloy for copper-to-brass or copper-to-steel
brazing.
6. Braze the liquid line to the liquid line service valve,
Turn off nitrogen flow. Repeat procedure starting at
paragraph 4 for brazing the suction line to the suction
service valve.

HOUSINGS

BRASS

(10)

NUTS (10)

UQU,D
L,NE
ASSEMBL,ES
"
(INCLUDES

STRAINER)

PISTON
RETAINER

(10)

_j_

__C%ER

LIQUID LINE
ASSEMBLY

Figure 18. 69J46 Kit Components
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps holding the liquid line
and distributor assembly,
3. Using two wrenches, disconnect liquid line from liquid
line orifice housing. Take care not to twist or damage
distributor tubes during this process.
4. Remove and discard fixed orifice, valve stem
assembly if present and Teflon washer as illustrated in
figure 19.
5. Use a field-provided fitting to temporary reconnect the
liquid line to the indoor unit's liquid line orifice housing,

7. After all connections have been brazed, disconnect
manifold gauge set the from service ports and remove
wrapping. Reinstall the service port core for both of the
outdoor unit's service valves.

DISTRIBUTOR

TUBES

LIQUID LINE ORIFICE

TEFLON

HOUSING

RING

FIXED

Remove

and discard

slem assembly

valve

(if present)

/ORIFICE/
"" " "

Remove the existing HCFC-22 refrigerant flow control
orifice or thermal expansion valve from the indoor coil. The
existing indoor unit HCFC-22 metering device is not
approved for use with HFC-410A refrigerant and may
prevent proper flushing,

DISTRIBUTO"R

" "

" • _

NUT

_ " " "

ASSEMBL___X_

REPLACEMENT

BRASS

LIQUID

LINE ASSEMBLY

PARTS
(INCLUDES

If replacement parts are necessary for the indoor unit,
order kit 69J46, The kit includes:
•

10 -- Brass nuts for liquid line assemblies

•

20 -- Teflon rings

STRAINER)

VA
VALVE STEM

CAP

(Uncased

Coil Shown)

Figure 19. Typical Fixed Orifice Removal

Page 11
SPB*H4

SERIES

TYPICAL TXV/CTXV REMOVAL PROCEDURE

CAUTION

1, On fully cased coils, remove the coil access and
plumbing panels,
2, Remove any shipping clamps holding the liquid line
and distributor assembly.

A IMPORTANT

3. Disconnect the equalizer line from the TXV/CTXV
equalizer line fitting on the suction line.

(Uncased Coil Shown)
TWO PIECE
PATCH PLATE
UNCASED COIL
ONLY)

LIQUID

LINE

STUB END

ORIFICE HOUSING

TXV/CTXV

DISTRIBUTOR
TUBES
RING

SENSING
LINE

IMPORTANT

LINEEQUALIZER
FITTING
MALE

SENSING

SUCTION
LINE
BULB

LIQUID
LINE

If the original system used:
Figure 20. Typical TXV/CTXV Removal
4, Remove the suction line sensing bulb.

•

HCFC-22 refrigerant, then flush the system using the
procedure provided in this section.

•

HFC-410A refrigerant, then proceed to Installing New
Refrigerant Metering Device,

5, Disconnect the liquid line from the TXV/CTXV at the
liquid line assembly,
6, Disconnect the TXV/CTXV from the liquid line orifice
housing. Take care not to twist or damage distributor
tubes during this process,
7, Remove and discard TXV/CTXV and the two Teflon
rings,
8, Use a field-provided fitting to temporary reconnect the
liquid line to the indoor unit's liquid line orifice housing,

IMPORTANT
RECOVERY

MACHINE

NOTE - THE INVERTED HCFC-22 CYLINDER MUST CONTAIN AT LEAST THE SAME
AMOUNT OF REFRIGERANT
AS WAS RECOVERED
FROM THE EXISTING SYSTEM,

Figure 21. Typical Flushing Connection

Page 12
505330M

02/08

REQUIRED EQUIPMENT
Equipment required to flush the existing line set and indoor
unit coil:
•

Two clean HCFC-22 recovery bottles,

•

Oilless recovery machine with pump-down feature,

•

Two gauge sets (one
HFC-410A).
FLUSHING PROCEDURE
1. Connect the following:

for

HCFC-22;

one

1 -- 1 1/4" wide copper mounting strap for sensing bulb
2 --#10

hex head bolts and nuts for securing sensing bulb

for
AND NUTS (2)
O_TEFLON

•

HCFC-22 cylinder with clean refrigerant to the
suction service valve,

•

HCFC-22 gauge set to the liquid line valve,

Recovery machine with an empty recovery tank to
the gauge set,
2. Set the recovery machine for liquid recovery and start
the recovery machine. Open the gauge set valves to
allow the recovery machine to pull a vacuum on the
existing system line set and indoor unit coil.
3. Invert the cylinder of clean HCFC-22 and open its
valve to allow liquid refrigerant to flow into the system
through the suction line valve, Allow the refrigerant to
pass from the cylinder and through the line set and the
indoor unit coil before it enters the recovery machine.

RINGS (2)

_ff

•

4. After all of the liquid refrigerant has been recovered,
switch the recovery machine to suction recovery so
that all of the HCFC-22 suction is recovered. Allow the
recovery machine to pull a vacuum on the system,
5. Close the valve on the inverted HCFC-22 drum and
the gauge set valves. Pump the remaining refrigerant
out of the recovery machine and turn the machine off.

STRAP

(1)

Figure 23. CTXV Kit Components
TYPICAL CTXV INSTALLATION PROCEDURE
The CTXV unit can be installed internal or external to the
indoor coil. In applications where an uncased coil is being
installed in a field-provided plenum, install the CTXV in a
manner that will provide access for field servicing of the
CTXV, Refer to Figure 24 for reference during installation
of CTXV unit,
TWO
PIECE

PATCH PLATE
(UNCASED COIL
ONLY)

DISTRIBUTOR
TUBES.
- -

(Uncased Coil Shown)
LIQUID LINE

OUSING
_RIFICE

CTXV
STUB

END

..
RING

SENSING
LINE

SPB*H4 units use CTXVfor metering refrigerant only. This
section
provides
instructions
on installing
CTXV
refrigerant metering device.

I/2 TURN

MALE
EQUALIZER
LiNE FITTING (SEE
FIGURE
26 FOR
FURTHER
DETAILS)

LINE
LIQUID
LINE

SENSING
BULB
INSULATION
IS
REQUIRED
IF MOUNTED
EXTERNAL
TO THE COIL CASING SEE FIGURE 25
FOR BULB POSITIONING.

Figure 22. Tightening

Distance

SPB*H4 ENGINEERING HANDBOOK
See the SPB*H4 Engineering Handbook for approved
indoor/outdoor
match-ups, applicable CTXV kits and
application information,

Figure 24. Typical CTXV Installation
1, Remove the field-provided fitting that temporary
reconnected the liquid line to the indoor unit's
distributor assembly.
2. Install one of the provided Teflon rings around the
stubbed end of the CTXV and lightly lubricate the
connector threads and expose surface of the Teflon
ring with refrigerant oil,

The following is the typical contents of a CTXV kit:
1 -- CTXV
2 -- Teflon rings

Page13
SPB*H4

SERIES

3. Attach the stubbed end of the CTXV to the liquid line
orifice housing. Finger tighten and use an appropriately
sized wrench to turn an additional 1/2 turn clockwise
as illustrated in figure 22, or 20 ft-lb.

FLARE SEAL
CAP

÷
I
I

4. Place the remaining Teflon washer around the other
end of the CTXV. Lightly lubricate connector threads
and expose surface of the Teflon ring with refrigerant
oil.

I"II_

Figure 26. Copper

f BULBt

SUCTION

LINES

SMALLER

LINE FITTING
SUCTION
LINE

Flare Seal Bonnet Removal

NOTE - To prevent any possibility of water damage,
properly insulate all parts of the TXV assembly that may
sweat due to temperature differences between the valve
and its surrounding ambient temperatures.

THAN

7#,

CKPOSITION
After the line set has been con nected to the indoor unit and
air conditioner, check the line set connections and indoor
unit for leaks. Use the following procedure to test for leaks:

IMPORTANT

LINE
ON 7/8" AND LARGER LINES,
MOUNT
SENSING
BULB AT
EITHER THE 4 OR 8 O'CLOCK
BOTTOM

P__SITION.

OF LINE.

NEVER

WARNING

MOUNT

Figure 25. TXV Sensing Bulb Installation

7. Remove and discard either the flare seal cap or flare
nut with copper flare seal bonnet from the equalizer
line port on the suction line as illustrated in figure 26.

A IMPORTANT

Page 14
505330M

02/08

EQUALIZER

8. Connect the equalizer line from the TXV to the
equalizer suction port on the suction line. Finger
tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated
in figure 22.

NOTE - Insulating the sensing bulb once installed may be
required when the bulb location is external to the coil
casing.

MALE BRASS

6. Attach the suction line sensing bulb in the proper
orientation as illustrated in figure 25 using the clamp
and screws provided.

FLARE SEAL
COPPER
BONNET

J
--

SUCT,ON
L,NE

5. Attach the liquid line assembly to the CTXV. Finger
tighten and use an appropriately sized wrench to turn
an additional 1/2 turn clockwise as illustrated in figure
22, or 20 ftqb.

FLARE NUT

AWARNING

,WARNING

Xk WARNING

,& IMPORTANT

1. Connect manifold gauge set to the service valve ports
as follows:

1. Connect an HFC-410A manifold gauge set high
pressure hose to the suction valve service port.
(Normally, the high pressure hose is connected to the
liquid line port; however, connecting it to the suction
port better protects the manifold gauge set from high
pressure damage,)

4. Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set,
5. Adjust dry nitrogen pressure to 150 psig (1034 kPa).
Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit,
6. After a few minutes, open one of the service valve
ports and verify that the refrigerant added to the
system earlier is measurable with a leak detector.
7. After leak testing disconnect
ports.

gauges from service

low pressure gauge to suction line service valve

•

high pressure gauge to liquid line service valve

2. Connect micron gauge.
3. Connect the vacuum pump (with vacuum gauge) to
the center port of the manifold gauge set,
4. Open both manifold valves and start the vacuum
pump.
5. Evacuate the line set and indoor unit to an absolute
pressure
of 23,000 microns (29,01 inches of
mercury),

2. With both manifold valves closed, connect the cylinder
of HFC-410A refrigerant to the center port of the
manifold gauge set. Open the valve on the HFC-410A
cylinder (suction only),
3. Open the high pressure side of the manifold to allow
HFC-410A into the line set and indoor unit, Weigh in
a trace amount of HFC-410A, [A trace amount is a
maximum of two ounces (57 g) refrigerant or three
pounds (31 kPa) pressure], Close the valve on the
HFC-410A cylinder and the valve on the high pressure
side of the manifold gauge set, Disconnect the
HFC-410A cylinder,

•

NOTE - During the early stages of evacuation, it is
desirable to close the manifold gauge valve at least once to
determine if there is a rapid rise in sure indicates a
relatively large leak, If this occurs, repeat the leak testing
procedure.
NOTE - The term absolute pressure means the total
actual pressure within a given volume or system, above
the absolute zero of pressure. Absolute pressure in a
vacuum is equal to atmospheric pressure minus vacuum
pressure.
6. When the absolute pressure reaches 23,000 microns
(29.01 inches of mercury), close the manifold gauge
valves, turn off the vacuum pump and disconnect the
manifold gauge center port hose from vacuum pump.
Attach the manifold center port hose to a dry nitrogen
cylinder with pressure regulator set to 150 psig (1034
kPa) and purge the hose. Open the manifold gauge
valves to break the vacuum in the line set and indoor
unit. Close the manifold gauge valves.
7. Shut off the dry nitrogen cylinder and remove the
manifold gauge hose from the cylinder. Open the
manifold gauge valves to release the dry nitrogen from
the line set and indoor unit.

Evacuating the system of non-condensables is critical for
proper operation of the unit. Non-condensables
are
defined as any gas that will not condense under
temperatures and pressures present during operation of
an air conditioning system. Non-condensables and water
suction combine with refrigerant to produce substances
that corrode copper piping and compressor parts.

8. Reconnect the manifold gauge to the vacuum pump,
turn the pump on, and continue to evacuate the line set
and indoor unit until the absolute pressure does not
rise above 500 microns (29.9 inches of mercury) within
a 20-minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
9. When the absolute pressure requirement above has
been met, disconnect the manifold hose from the

Page15
SPB*H4

SERIES

vacuum pump and connect it to an upright cylinder of
HFC-410A refrigerant. Open the manifold gauge valve
1 to 2 psig in order to release the vacuum in the line set
and indoor unit.

Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.

10. Close manifold gauge valves and shut off the
HFC-410A cylinder and remove the manifold gauge
set.

24VAC TRANSFORMER
Use the transformer provided with the furnace or coil
blower for low-voltage control power (24VAC - 40 VA
minimum)

If the system is void of refrigerant, clean the system using
the procedure described below.

NOTE - The addition of accessories to the system could
exceed
the 40VAC power
requirement
of the
factory-provided
transformer. Measure the system's
current and voltage after installation is complete to
determine transformer loading. If loading exceeds the
factory-provided
transformer
capacity,
a
larger
field-provided transformer will need to be installed in the
system,
WIRING CONNECTIONS
1, Install line voltage power supply to unit from a properly
sized disconnect switch,

1. Use nitrogen to pressurize the system and check for
leaks. Repair all leaks.
2. Evacuate the system to remove as much of the
moisture as possible.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again. Then, weigh the
appropriate amount of HFC-410A refrigerant as listed
on unit nameplate into the system.

2. Ground unit at unit disconnect switch or to an earth
ground,

5. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level. If system dryness is not
verified, the compressor will fail in the future.

NOTE - Connect condu# to the unit using a proper
conduit fitting. Units are approved for use only with
copper conductors. Refer to figure 27 for high voltage
field wiring diagram, A complete unR wiring diagram is
located on the back side of the unit's access panel.
AI08
DEFROST

WARNING

CONTROL

GROUND
LOG

q
_OUND

OUTDOOR
FAN

184

Cb}--- BLACK-RUN
PURPLECAPACITOR
ORANGE-COMMON
C_
CAPACITOR

KI COMPRESSOR
UUN_AUIUM
_Llt_
FIELD

In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).

Page 16
505330M

02/08

VOLTAGE
INSTALLED

NOTE - FOR USE WITH COPPER
CONDUCTORS
ONLY. REFER TO UNIT
RATING
PLATE
FOR MINIMUM
CIRCUIT
AMPACITY
AND
MAXIMUM
OVER-CURRENT
PROTECTION
SIZE.

Figure

27. Typical

Field Wiring

RT28
DISCHARGE
SENSOR

T73OOF
THERMOSTAT

CB31MV

o%yMv
B4
FAN

SB7 LOW
PRESSURE

_K58-

SWITCH

_ ._'_V
(_}C

BLACK_A

REVERSING
VALVE

RTI3 AMBIENT
SENSOR

-- -- J%_

....

-+-4#I

Ill ......................................
_:
.....................
I.............

RT21 DEFROST
COIL
SENSOR

LO-PS

$4 HIGH
PRESSURE
SWITCH

°OUT
YB

z_
EQUIPMENT
GROUND

I I

OUTr..___

I I--

_!LTUHE
oWRIIRMEPED

TERMINAL

OUT

$5 DISCH
LIMIT
TEMP

L_
BICOMPRESSORz_
_DENOTES
--

OPTIONAL
--

COMPONENTS
WARNINGZ_ELECTRIC
SHOCK
HAZARD,CAN
CAUSE
INJURY
OR DEATH,UNIT
MUST
BE
GROUNDEO
IN ACCORDANCE
WITH
NATIONAL
AND LOCAL
CODES.

LINE
VOLTAGE
FIELD
INSTALLED
CLASS
II VOLTAGE
FIELD
INSTALLED

NOTEZ_FOR
USE WITH
COPPER
CONDUCTORS
ONLY,REFER
TO UNIT
RATING
PLATE
FOR MINIMUM
CIRCUIT
AMPAC]TY
AND MAXIMUM OVERCURRENT
PROTECTION
SIZE

_!_REMOVE

JUMPER

FOR

TWO

STAGE

COOL

CRIMPED
TO BLUE WIRE
USE TERMINAL
OR CUT
OFF TERMINAL
AND SPLICE BLUE WIRE WITH Y2
WIRE TO INDOOR

UNIT.

/A L$4,SECOND STAGE, SOLENOID IS LOCATED
z_IN
COMPRESSOR. COIL IS Z¢VDC, DO NOT CONNECT
R4VAC TO COIL TERMINALS.

Z_REPER

COMPRESSOR

UNIT

FOR

ACTUAL

TERMINAL

ARRANGEMENT.

Figure

_RTI4

SENSOR,OUTDOOR

28. Typical

NOTE - For proper voltages, select thermostat wire
gauge per the following chart:
Wire run length

AWG #

Insulation type

less than 100' (30m)

color-coded, temperature

more than lOg' (3Om)

rating 35°C minimum

3. Install room thermostat (ordered separately) on an
inside wall approximately
in the center of the
conditioned area and 5 feet (1.5 m) from the floor. It
should not be installed on an outside wall or where it
can be effected by sunlight, drafts or vibrations,

TEMP

Wiring

(OPTIONAL)

SII

AND K58 ARE OPTIONAL LOW AMBIENT CONTROLS

Diagram

THREE-PHASE SCROLL VOLTAGE PHASING
Three-phase
scroll compressors
must be phased
sequentially to ensure correct compressor rotation and
operation. Incorrect line voltage phasing may cause
compressor damage and abnormal unit operation. Power
wires are color-coded as follows: Line 1 - red, line 2 - yellow,
line 3 - blue,
To test for proper rotation and operation:

4, Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit (figure 28),
NOTE - 24V, Class II circuit connections are made in
the low voltage junction box.

1, Install refrigeration
gauges on system,
Cycle
compressor ON and observe that suction pressure
decreases and discharge pressure increases,
2, If pressures do not follow the above conditions,
disconnect all power to unit, Reverse any two
field-installed main power wires to the line side of the
compressor contactor. Make sure connections are tight,
Repeat pressure test with system,

Page 17
SPB*H4

SERIES

Temp.
IDT
ofair
180
entering._78
indoor
_ I _
coilOF
_jru

24
23
_
_
21

24
23

23
22

22
21

22
20

20
19

19 18
18 17

17
16

16
15

15
14

22
21

21
20

21 20
19 19

19
18

19
17

18
16

17 16
16 15

15
14

14
15

13
12

_72

16Z_15

_70

14 13

_'174

1. Determine
the desired ])T--Measure
entering air temperature using dry bulb (A) and wet bulb (B). ])T is the intersecting value
of A and B in the table (see triangle),
2. Find temperature
drop across coil--Measure
the coil's dry
bulb entering and leaving air temperatures (A and C). Temperature
Drop Formula: (TDrop) = A minus C,

Wet-bulb°F 57 58 59 60 61 62 63 64 65 66 67 68 69 70 I

B
19o
All temperatures
expressed
in °F

INDOOR

are
COIL

DRY
BULB

3. Determine
if fan needs adjustment_lf
the difference between the measured TDrop and the desired ])T (TDropiDT) is within
+3 °, no adjustment is needed. See examples: Assume ])T = 15 and
A temp. = 72 °, these C temperatures would necessitate stated actions:
C°

TDrop-

])T

°F

ACTION

530

Increase the airflow

58 °

-1

(within +3 ° range) no change

620

-5

Decrease the airflow

4. Adjust the fan speed--See
crease/decrease fan speed.

WET

BULB

indoor unit instructions to in-

Changing air flow affects all temperatures; recheck temperatures to
confirm that the temperature drop and DT are within +3 °.

Figure 29. Checking

Indoor Coil Airflow

Guide

SETTING UP TO CHECK CHARGE
1, Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of HFC-410A.

IMPORTANT

2. Connect the manifold gauge set to the unit's service
ports as illustrated in figure 2.
• low pressure gauge to vapor service port
• high pressure gauge to liquid service port

1. Rotate fan to check for binding.

COOLING

2. Inspect all factory- and field-installed wiring for loose
connections.
3, After evacuation is complete, open both the liquid and
vapor line service valves to release the refrigerant
charge contained in outdoor unit into the system,
4, Replace the stem caps and tighten to the value listed
in table 1,
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit's
nameplate. If not, do not start the equipment until you
have consulted with the power company and the
voltage condition has been corrected,
6, Set the thermostat for a cooling demand. Turn on
power to the indoor indoor unit and close the outdoor
unit disconnect switch to start the unit.
7, Recheck voltage while the unit is running. Power must
be within range shown on the nameplate,
8, Check system for sufficient refrigerate by using the
procedures
listed under Testing and Charging
System,
TESTING AND CHARGING SYSTEM

Check airflow using the Delta-T (DT) process using the
illustration in figure 29,
HEATING MODE INDOOR AIRFLOW CHECK
Blower airflow (CFM) may be calculated by energizing
electric heat and measuring:
•

Temperature rise between the return air and supply air
temperatures at the indoor coil blower unit,

•

Measuring voltage supplied to the unit,

•

Measuring amperage being drawn by the heat unit(s),

Then, apply the measurements taken in following formula
to determine CFM:
CFM =

1.08 x Temperature rise (F)
CHARGE

If the system is void of refrigerant, first, locate and repair
any leaks and then weigh in the refrigerant charge into the
unit, To calculate the total refrigerant charge:

Page 18
02/08

Amps x Volts x 3.41

CALCULATING

This system uses HFC-410A refrigerant which operates at
much higher pressures than HCFC-22. The pre-installed
liquid line filter drier is approved for use with HFC-410A
only. Do not replace it with components designed for use
with HCFC-22. This unit is NOT approved for use with coils
which use capillary tubes as a refrigerant metering device,

505330M

MODE INDOOR AIRFLOW CHECK

Amount
specified
on
nameplate
+

Adjust amount, for
variation in line set
length listed on table
in figure 30.
+

Additional charge
specified per
indoor unit
match-up listed in
tables 3through 5.
=

Total
charge

WEIGH

1. Check Liquid and suction line pressures
LENNOX

Refrigerant Charge per Line Set Length
Liquid Line
Set Diameter

Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*

¢ _5
3t8" (9.5 mm)

2. Compare unit pressures with table
Normal Operating Pressures.

3. Conduct
leak check;
previously outlined.

evacuate

4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over feet,

3 ounce per 5' (85 g per 1.5 m)

NOTE - *If line length is greater than 15 ft. (4.6 m), add this
amount. If line length is less than 15 ft. (4.6 m), subtract this
amount.

HmBl/Jillln|

@,::::_,

This nameplate is for illustration purposes
only. Go to actual nameplate on outdoor
unit for charge information.

Figure 30. Using Weigh In Method

Check the airflow as illustrated in figure 29 to be sure the indoor airflow is as required.
(Make any air flow adjustments before continuing with the following procedure.)

SUBCOOL G'
2

Measure outdoor ambient temperature; determine whether to use cooling
heating mode to check charge.

Connect gauge set.

Check Liquid and Vapor line pressures. Compare pressures with Normal Operating
Pressures table 7, (The reference table is a general guide. Expect minor pressure
variations. Significant differences may mean improper charge or other system problem.)

USE COOLING
MODE

Set thermostat for heat/cool demand, depending on mode being used:

60°F (15 °) --

Using cooling mode--When
the outdoor ambient temperature is 60°F (15°C) and above.
Target subcooling values in table below are based on 70 to 80°F (21-27°C) indoor return air
temperature; if necessary, operate heating to reach that temperature range; then set
thermostat to cooling mode setpoint to 68°F (20°C). When pressures have stabilized, continue
with step 6.

USE HEATING
MODE

Using heating mode--When the outdoor ambient temperature is below 60°F (15°C). Target
subcooling values in table below are based on 65-75°F (18-24°C) indoor return air
temperature; if necessary, operate cooling to reach that temperature range; then set
thermostat to heating mode setpoint to 77°F (25°C). When pressures have stabilized, continue
with step 6.

q;_@i}ii¢

SAT o
LIQ o SC o =

mode or

Read the liquid line temperature;

Read the liquid line pressure; then find its corresponding temperature
pressure chart listed in table 6 and record it in the SAT° space.

record in the LIQ ° space.

Subtract LIQ ° temp. from SAT ° temp. to determine subcooling; record it in SC ° space.

Compare SC ° results with table below, being sure to note any additional charge for line set
and/or match-up.

in the temperature/

10 If subcooling value is greater than shown in tables 3 through 5 for the applicable unit, remove
refrigerant; if less than shown, add refrigerant.
11 If refrigerant is added or removed, repeat steps 6 through 10 to verify charge.

Figure 31. Using Subcooling

Method

Page 19
SPB*H4

SERIES

Table 3. SPB*H4-036
INDOOR

Target
Subcooling
Heat
Cool
(+5OF)
(±1OF)

MATCH-UP

INDOOR
MATCH-UP
**Add

Target
Subcooling Heat
Cool
(+5°F)
(+l°F)

CH88_2D

CX34_0D

CX34_2C

CX34_2D

CR33

CH23-85

CR33_0D_

CBX28UH-030

CX34_9C

CBX28UH-038

CB27UH-036

CB27UH-042

CB3OU-31

CB3OU-41/46

CBX32M-030

CBX32M-036

CBX32MV-024/030

CBX32MV-036

C33-44C

CH33-438
CH33-49C

CH33-44/48B
CH33-48C

2F
2F

CR33_48B/C-F
CR33-50/60C

80/80C

Table 6. HFC-410A Temp. (°F) - Pressure (Psig)
°F

Psig

°F

Psig

°F

Psig

°F

Psig

-40

10.1

80.5

158.2

278.2

-35

13.5

82.3

161

282.3

-30

17.2

84.1

163.9

286.5

-25

21.4

85.9

166.7

290.8

-20

25.9

87.8

169.6

295.1

-18

27.8

89.7

172.6

299.4

-16

29.7

91.6

175.4

303.8

CX34-38A/B_F

Senal No# before 6007K

CX34-38A/B_F

Senal No# 6007K and after

-14

31.8

93.5

178.5

308.2

CX34-43B/C_F

-12

33.9

95.5

181.6

312.7

CX34-6OD

-10

36.1

97.5

184.3

100

317.2

-8

38.4

99.5

187.7

101

321.8

-6

40.7

100.8

190.9

102

326.4

-4

43.1

102.9

194.1

103

331

-2

45.6

105

197.3

104

335.7

48.2

107.1

200.6

105

340.5

49.5

109.2

203.9

106

345.3

**Amount
nameplate.

charge

CH23-51

CH33-428

**Add

charge

of charge
(Remember

required
in
to consider

additional
line set

to
length

charge
shown
difference.)

unit

Table 4. SPB*H4-048
INDOOR

Target
Subcoo]ing
Heat
Cool
(+5OF)
(±1OF)

MATCH-UP

**Add

charge

CH23-88

50.9

111.4

207.2

107

350.1

CB27UH-048

52.2

113.6

210.6

108

355

CB27UH-080

53.6

115.8

214

109

360

118

217.4

110

365

56.4

120.3

220.9

111

370

57.9

122.6

224.4

112

375.1

CB30U-51,
CBX32M

_5
048,

080

CBX32MV

088

CH33-60D

CH33-62D

59.3

125

228

113

380.2

CX34-60D

60.8

127.3

231.6

114

385.4

CX34-62D

62.3

129.7

235.3

115

390.7

63.9

132.2

239

116

396

65.4

134.6

242.7

117

401.3

137.1

246.5

118

406.7

68.6

139.6

250.3

119

412.2

70.2

142.2

254.1

120

417.7

CR33-60

Table 5. SPB*H4-060
INDOOR

Target
Subcooling Heat
Cool
(+5OF)
(+1OF)

MATCH-UP

**Add

charge

CH23-68

CH23-65

71.9

144.8

258

121

423.2

73.5

147.4

262

122

428.8

CB27UH-060

CBX32M

75.2

150.1

266

123

434.5

152.8

270

124

440.2

78.7

155.5

274.1

125

445.9

CBX26UH

060
060

CBX32MV

068

CH33-6OD

Page 20
505330M

02/08

Table 7. Normal Operating Pressures - Liquid +10 & Vapor +5 PSIG*
Model
Mode

Stage

First (Low
Capacity)
Pressure

Cooling

Second (High
Capacity)
Pressure

First (Low
Capacity)
Pressure

Heating

Second
(High
Capacity)
Pressure

*IMPORTANT--These

SPB036H4S4

°F (°C)**

Liquid

SPB048H4S4
Vapor

Liquid

SPB060H4S4
Vapor

Liquid

Vapor

65 (18.3)

225

144

235

144

225

138

75 (23.9)

261

147

268

145

264

141

85 (29.4)

302

149

310

147

305

142

95(35.0)

349

151

356

148

352

146

165 (46.6)

397

153

407

150

405

148

115 (46.1)

461

157

466

152

459

150

65 (18.3)

239

139

244

140

241

134

75 (23.9)

278

141

283

141

280

136

85 (29.4)

322

143

326

144

324

137

95(35.0)

367

146

374

147

373

138

165 (46.6)

426

148

427

148

425

142

115 (46.1)

489

151

491

151

486

146

46 (4.4)

328

369

351

50 (10)

333

118

366

114

335

26 (-7.6)

296

311

308

36 (-1.6)

309

334

323

46 (4.4)

322

354

318

56 (16)

336

113

381

108

329

are most-popular-match-up

pressures. Indoor match up and indoor load cause pressures to vary.

**Temperature of the air entering the outside coil (outdoor ambient temperature).

INSTALLING SERVICE VALVE CAPS
Disconnect gauge set and re-install both the liquid and
suction service valve caps,
INSTALL
OUTDOOR
UNIT
SERVICE
VALVES

placed in the emergency heat position, the outdoor unit
control circuit is isolated from power and field-provided relays
bypass the outdoor thermostats. An amber indicating light
simultaneously comes on to remind the homeowner that he
is operating in the emergency heat mode.

CAPS

Emergency heat is usually used during an outdoor unit
shutdown, but it should also be used following a power
outage if power has been off for over an hour and the
outdoor temperature is below 50°F (10°C). System should
be left in the emergency heat mode at least six hours to
allow the crankcase heater sufficient time to prevent
compressor slugging.

Figure 32. Installing Service Valve Caps

FILTER DRIER
The outdoor unit and indoor blower cycle on demand from
the room thermostat. When the thermostat blower switch
is in the ON position, the indoor blower operates
continuously.
THERMOSTAT OPERATION
Some indoor thermostats incorporate isolating contacts
and an emergency heat function (which includes an amber
indicating light). The thermostat is not included with the
unit and must be purchased separately,

The unit is equipped with a large-capacity bi-flow filter drier
which keeps the system clean and dry. If replacement is
necessary, order another of like design and capacity. The
replacement filter drier must be suitable for use with
HFC-410A refrigerant.

EMERGENCY HEAT (AMBER LIGHT)
An emergency heat function is designed into some room
thermostats. This feature is applicable when isolation of the
outdoor unit is required, or when auxiliary electric heat is
staged by outdoor thermostats. When the room thermostat is

DEFROST SYSTEM DESCRIPTION
The demand defrost controller measures differential
temperatures to detect when the system is performing
poorly because of ice build-up on the outdoor coil, The
controller self-calibrates when the defrost system starts
and after each system defrost cycle. The defrost control
board components are shown in figure 33,

Page21
SPB*H4

SERIES

TEST
PINS
DEFROST
TERMINATION
PIN
SETTINGS
SENSOR
PLUG
IN
(COIL
AND
AMBIENT
SENSORS)

DELAY
PINS
REVERSING
VALVE o

LOW
AMBIENT
THERMOSTAT
PINS

DIAGNOSTIC
LEDS

24V TERMINAL
STRIP
CONNECTIONS

Low Pressure (auto reset) - trip at 25 psig; reset at 55
psig.
PRESSURE SWITCH 5-STRIKE LOCKOUT
The internal control logic of the board counts the pressure
switch trips only while the Y1 INPUT line is active. If a
pressure switch opens and closes four times during a Y1
INPUT, the control logic will reset the pressure switch trip
counter to zero at the end of the Y1 INPUT. If the pressure
switch opens for a fifth time during the current Y1 INPUT,
the control will enter a lockout condition.

)o
©

o o o o o o • o
TST P_ OF C _ 0 Y] YZ

LOCATIONS

VARY BY BOARD

MANUFACTURER.

The 5-strike pressure switch lockout condition can be reset
by cycling OFF the 24-volt power to the control board or by
shorting the TEST pins between 1 to 2 seconds. All timer
functions (run times) will also be reset.

Figure 33. Outdoor Unit Defrost
Control Board (100135-03)
The control monitors ambient temperature, outdoor coil
temperature, and total run time to determine when a
defrost cycle is required. The coil temperature probe is
designed with a spring clip to allow mounting to the outside
coil tubing. The location of the coil sensor is important for
proper defrost operation.
NOTE - The demand defrost board accurately measures
the performance of the system as frost accumulates on the
outdoor coil. This typically will translate into longer running
time between defrost cycles as more frost accumulates on
the outdoor coil before the board initiates defrost cycles.
DEFROST BOARD DIAGNOSTIC LEDS
The state OFF, ON and FLASHING of two LEDs on the
defrost board DS1 [Red] and DS2 [Green] indicate
diagnostics conditions that are described in table 9.
DEFROST BOARD PRESSURE SWITCH
CONNECTIONS
The unit's automatic reset pressure switches LO PS-$87
and HI PS-S4 are factory-wired into the defrost board on
the LO-PS and HI-PS terminals, respectively.
Low Pressure Switch (LO-PS)--When the low pressure
switch trips, the defrost board will cycle off the compressor,
and the strike counter in the board will count one strike.
The low pressure switch is ignored under the following
conditions:
•
•

during the defrost cycle and 90 seconds after the
termination of defrost
when the average
below 15 ° F (-9°C)

ambient sensor temperature

during TEST mode

DEFROST BOARD PRESSURE SWITCH SETTINGS
High Pressure (auto reset) - trip at 590 psig; reset at 418
psig.

)L
)R

CIRCUIT
..... [_O
CONNECTIONS

for 90 seconds following the start up of the compressor

•

High Pressure Switch (HI-PS)--When the high pressure
switch trips, the defrost board will cycle off the compressor,
and the strike counter in the board will count one strike.

_o-Ps

•

If a pressure switch opens while the Y1 OUT line is
engaged, a 5-minute short cycle will occur after the switch
closes.
DEFROST SYSTEM SENSORS
Sensors connect to the defrost board through a
field-replaceable harness assembly that plugs into the
board (see figure 35). Through the sensors, the board
detects outdoor ambient, coil, and discharge temperature
fault conditions. As the detected temperature changes, the
resistance across the sensor changes. Figure 34 shows
how the resistance varies as the temperature changes for
both type of sensors. Sensor resistance values can be
checking by ohms across pins shown in table 8.
NOTE - When checking the ohms across a sensor, be
aware that a sensor showing a resistance value that is not
within the range shown in table 8, may be performing as
designed. However, if a shorted or open circuit is detected,
then the sensor may be faulty and the sensor harness will
need to be replaced.
Table 8. Sensor Temperature/Resistance
Sensor

Temperature
Range °F (°C)

Resistance values
range (ohms)

Pins/Wire
Color

Outdoor

-35 (-37) to 120
(48)

280,000 to 3750

3 &4
(Black)

Coil

-35 (-37) to 120
(48)

280,000 to 3750

5 &6
(Brown)

Discharge (if
applicable)

24 (-4) to 350
(176)

41,000 to 103

1 & 2 (Yellow)

is
Note: Sensor resistance increases as sensed temperature decreases.

Page 22
505330M

02/08

Range

Ambient Sensor--The ambient sensor considers
outdoortemperatures
below-35°F(-37°C)orabove120°F
(48°C)asafault.Iftheambient
sensorisdetected
asbeing
open,shortedor out of the temperaturerangeof the
sensor,the board will not performdemanddefrost
operation.The board will revert to time/temperature
defrostoperationandwill displaythe appropriatefault
code.Heatingandcoolingoperation
willbeallowedinthis
faultcondition.
Ambient
m

demand, it reverts to a lockout mode and displays the
appropriate code. This code detects shorted sensor or
high discharge temperatures. Code on board is
Discharge Line Temperature Fault and Lockout.
2. If the board recognizes five temperature sensor range
faults during a single Y1 compressor demand, it
reverts to a lockout mode and displays the appropriate
code.
The
board
detects
open
sensor
or
out-of-temperature
sensor range. This fault is
detected by allowing the unit to run for 90 seconds
before checking sensor resistance. If the sensor
resistance is not within range after 90 seconds, the
board will count one fault. After five faults, the board
will lockout. Code on board is Discharge Sensor Fault
and Lockout.

and Coil Sensor

7150
19275
11775

The discharge line sensor, which covers a range of 150°F
(65°C) to 350°F (176°C), is designed to mount on a W'
refrigerant discharge line.

15425
_

19975
26200
m 34375
m

10000

30000

I 62700

50000

70000

RESISTANCE

Dischar

NOTE - Within a single room thermostat demand, if
5-strikes occur, the board will lockout the unit. Defrost
board 24 volt power R must be cycled OFF or the TEST
pins on board must be shorted between I to 2 seconds to
reset the board.

46275
85300
I
90000

(OHMS)

Second-Stage Operation--If
the board receives a call for
second-stage compressor operation Y2 in heating or
cooling mode and the first-stage compressor output is
active, the second-stage compressor solenoid output will
be energized.

le Sensor

D
B250
_325
_425

If first-stage compressor output is active in heating mode
and the outdoor ambient temperature is below the selected
compressor
lock-in temperature,
the second-stage
compressor solenoid output will be energized without the
Y2 input. If the jumper is not connected to one of the
temperature selection pins on P3 (40, 45, 50, 55°F), the
default lock-in temperature of 40°F (4.5°C) will be used.

_600
_825
m_175

700
2025
_500
;000
3750
4650

1000

2000

3000

4000

5000

5825

6000

RESISTANCE/OHMS/

Figure

34. Temperature/Resistance
Charts

Coil Sensor--The coil temperature sensor considers
outdoor temperatures below -35°F (-37°C) or above 120°F
(48°C) as a fault. If the coil temperature sensor is detected
as being open, shorted or out of the temperature range of
the sensor, the board will not perform demand or
time/temperature defrost operation and will display the
appropriate fault code. Heating and cooling operation will
be allowed in this fault condition.
Discharge
Line Sensor--If
the discharge
line
temperature exceeds a temperature of 300°F (148°C)
during compressor operation, the board will de-energize
the compressor contactor output (and the defrost output, if
active). The compressor will remain off until the discharge
temperature has dropped below 225°F (107°C) and the
5-minute anti-short cycle delay has been satisfied. This
sensor has two fault and lockout codes:
1. If the board recognizes five high discharge line
temperature faults during a single Y1 compressor

The board de-energizes the second-stage compressor
solenoid output immediately when the Y2 signal is
removed or the outdoor ambient temperature is 5°F above
the selected compressor lock-in temperature, or the
first-stage compressor output is de-energized for any
reason.
Defrost Temperature
Termination
Shunt (Jumper)
Pins--The defrost board selections are: 50, 70, 90, and
100°F (10, 21, 32 and 38°C). The shunt termination pin is
factory set at 50°F (10°C). If the temperature shunt is not
installed, the default termination temperature is 90°F
(32°C).
DELAY MODE
The defrost board has a field-selectable function to reduce
occasional sounds that may occur while the unit is cycling
in and out of the defrost mode. When a jumper is installed
on the DELAY pins, the compressor will be cycled off for 30
seconds going in and out of the defrost mode. Units are
shipped with jumper installed on DELAY pins.
NOTE - The 30 second off cycle is NOTfunctional
jumpering the TEST pins.

when

Page 23
SPB*H4

SERIES

COIL SENSOR

DEFROST

BOARD

DEFROST

SENSOR

-7

TUBES UP FROM
SPB*H4-036
BOTTOM

(6-1/2")

HARNESS

SPB*H4-060
COIL SENSOR

- 12

TUBES UP FROM
BOTTOM (11-1/2")

SENSOR

SPB*H4-048
COIL SENSOR - 13
TUBES UP FROM
BOTTOM

DISCHARGE
LINE
SENSOR

GREASE
RETURN
SENSOR

(12-1/2")

BETWEEN
BEND AND
CLIP COIL TEMPERATURE
SENSOR FROM THE DEFROST
ON THE RETURN BEND SHOWN.

Figure
OPERATIONAL

35. Sensor

DESCRIPTION

The defrost control board has three basic operational
modes: normal, defrost, and calibration.
•

Normal Mode--The

demand defrost board monitors

Calibration
Mode--The
board
is considered
uncalibrated when power is applied to the board, after
cool mode operation, or if the coil temperature
exceeds the termination temperature when it is in heat
mode,
Calibration of the board occurs after a defrost cycle to
ensure that there is no ice on the coil. During
calibration, the temperature of both the coil and the
ambient sensor are measured to establish the
temperature differential which is required to allow a
defrost cycle.

•

Defrost Mode--The following paragraphs provide a
detailed description of the defrost system operation,

DETAILED DEFROST SYSTEM OPERATION
The demand defrost control board initiates a defrost cycle
based on either frost detection or time.

A IMPORTANT

Time--If 6 hours of heating mode compressor run time
has elapsed since the last defrost cycle while the coil
temperature remains below 35°F (2°C), the demand
defrost control will initiate a defrost cycle,
Actuation--When
the reversing valve is de-energized,
the Y1 circuit is energized, and the coil temperature is
below 35°F (2°C), the board logs the compressor run time.
If the board is not calibrated, a defrost cycle will be initiated
after 34 minutes of heating mode compressor run time,
The control will attempt to self-calibrate after this (and all
other) defrost cycle(s),
Calibration
success
depends
on stable
system
temperatures during the 20-minute calibration period. If
the board fails to calibrate, another defrost cycle will be
initiated after 90 minutes of heating mode compressor run

Page 24
505330M

02/08

Locations

Frost Detection--If
the compressor runs longer than 34
minutes and the actual difference between the clear coil
and frosted coil temperatures exceeds the maximum
difference allowed by the control, a defrost cycle will be
initiated,

the O line, to determine the system operating mode
(heat/cool),
outdoor ambient
temperature,
coil
temperature (outdoor coil) and compressor run time to
determine when a defrost cycle is required,
•

BOARD

time.Oncethe defrostboardis calibrated,it initiatesa
demanddefrostcyclewhenthe differencebetweenthe
clear coil and frostedcoil temperatures
exceedsthe
maximumdifferenceallowedby the controlORafter6
hoursof heatingmodecompressorruntime has been
loggedsincethelastdefrostcycle.
Termination--Thedefrostcycle endswhen the coil
temperature
exceedsthetermination
temperature
or after
14minutesofdefrostoperation.
Ifthedefrostisterminated
by the 14-minutetimer,anotherdefrostcyclewill be
initiatedafter34minutesof runtime.
Test Mode--When Y1 is energized and 24V power is

Enter the TEST mode by placing a shunt (jumper) across
the TEST pins on the board after power-up. (The TEST
pins are ignored and the test function is locked out if the
shunt is applied on the TEST pins before power-up). Board
timings are reduced, the low-pressure switch is ignored
and the board will clear any active lockout condition.
Each test pin shorting will result in one test event. For
each TEST the shunt (jumper) must be removed for at
least one second and reapplied. Refer to flow chart (figure
36) for TEST operation.
Note: The Y1 input must be active (ON) and the 0 room
thermostat terminal into board must be inactive.

being applied to the board, a test cycle can be initiated by
placing the termination temperature jumper across the
TEST pins for 2 to 5 seconds. If the jumper remains across
the TEST pins longer than 5 seconds, the control will
ignore the test pins and revert to normal operation. The
jumper will initiate one cycle per test.
Table 9. Defrost

Control

DEFROST BOARD DIAGNOSTICS
See table 9 to determine defrost board operational
conditions and to diagnose cause and solution to
problems.
Board Diagnostic

LEDs

DS2

DS1

Green

Red

Condition/Code

Possible

OFF

Power problem

No power (24V) to board terminals R
& C or board failure.

1 Check control transformer power (24V).
2 If power is available to board and LED(s) do not
light, replace board.

Simultaneous
SLOW Flash

Normal operation

Unit operating normally or in standby
mode.

None required.

Alternating SLOW
Flash

5-minute anti-short cycle
delay

Initial power up, safety trip, end of
room thermostat demand.

None required (Jumper TEST pins to override)

Simultaneous
FAST Flash

Ambient Sensor Problem

Sensor being detected open or shorted or out of temperature range. Board will revert to time/
temperature defrost operation. (System will still heat or cool).

Alternating
FAST Flash

Coil Sensor Problem

Sensor being detected open or shorted or out of temperature range. Board will not perform
demand or time/temperature defrost operation. (System will still heat or cool).

Circuit Board Failure

Indicates that board has internal component failure. Cycle 24 volt power to board. If code does
not clear, replace board.

FAULT

& LOCKOUT

CODES

Cause(s)

Solution

(Each fault adds 1 strike to that code's counter; 5 strikes per code = LOCKOUT)

OFF

SLOW
Flash

Low Pressure Fault

OFF

Low Pressure LOCKOUT

SLOW
Flash

OFF

High Pressure Fault

OFF

High Pressure LOCKOUT

SLOW
Flash

Discharge Line Temperature
Fault

FAST
Flash

Discharge Line Temperature
LOCKOUT

OFF

Fast
Flash

Discharge Sensor Fault

Fast
Flash

OFF

Discharge Sensor
LOCKOUT

1 Restricted air flow over indoor or
outdoor coil.
2 Improper
refrigerant
charge
in
system.
3 Improper metering device installed or
incorrect
operation
of metering
device.
4 Incorrect or improper sensor location
or connection to system.

1 Remove any blockages or restrictions from coils
and/or fans. Check indoor and outdoor fan motor for
proper current draws.
2 Check system charge using approach and subcooling
temperatures.
3 Check system operating pressures and compare to
unit charging charts.
4 Make sure all pressure switches and sensors have
secure connections to system to prevent refrigerant
leaks or errors in pressure
and temperature
measurements.

This code detects shorted sensor or high discharge temperatures. If the discharge line temperature
exceeds a temperature of 300°F (148°C) during compressor operation, the board will de-energize
the compressor contactor output (and the defrost output if active). The compressor will remain off
until the discharge temperature has dropped below 225°F (107°C).

The board detects open sensor or out of temperature sensor range. This fault is detected by
allowing the unit to run for 90 seconds before checking sensor resistance. If the sensor resistance
Is not within range after 90 seconds, the board will count one fault. After 5 faults, the board will
lockout.

Page25
SPB*H4

SERIES

Y1 Active ("0" line inactive)
I

i,
Short test pins for longer than 1

Short test pins for more than 2.0 seconds

second but ess than 2.0 seconds
Clear any short cycle lockout or 5-strike fault
lockout function, if applicable.
Clear any short cycle lockout and/
or 5-strike fault lockout function, if
applicable. No other functions will
be executed and unit will continue
in the mode it was operating.

I,finCOO',.G
Mode
I
No further test mode
operation
will
be
executed until the test
short is removed and
Lreapp ed.

Mode

] I,fin
O .OSZMode

The controller will check for ambient and I
coil faults (open or shorted). If a fault
exists, the unit will remain in Heat Mode
and no further test mode operation will be I
executed until the test short is removed
and re applied. If no fault exists, the unit will
go nto Defrost mode.
I

The unit will terminate defrost and I
enter Heat Mode uncalibrated with I
defrost timer set for 34 minute test.
No further test mode operation will I
be executed until the test short is I
removed and reapp ed.

Test pins short REMOVED before a

Test pin short REMAINS in place for more than 5 seconds

max mum of 5 seconds

t
The unit will return to Heat mode uncalibrated with defrost timer set for
34 minutes. No further test mode operation will be executed until the

The unit will remain in Defrost mode until

test short s removed and re app ed.

termination on time or temperature

Figure 36. Test Mode Operation

kWARNING

Before the start of each heating and cooling season, the
following service checks should be performed by a
qualified service technician. First, turn off electrical power
to the unit prior to performing unit maintenance.
•

Inspect and clean the outdoor and indoor coils. The
outdoor coil may be flushed with a water hose.

NOTE - It may be necessary to flush the outdoor coil more
frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, etc.)
•

Visually inspect the refrigerant lines and coils for leaks.

•

Check wiring for loose connections.

•

Check voltage at the indoor and outdoor units (with
units operating).

•

Check the amperage draw at the outdoor fan motor,
compressor, and indoor blower motor. Values should
be compared with those given on unit nameplate.

•

Check, clean (or replace) indoor unit filters.

•

Check the refrigerant charge and gauge the system
pressures.
Check the condensate drain line for free and
unobstructed flow; clean, if necessary.

•
•

Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM
Refer to the unit information service manual for pressure
drop tables and procedure.

•

Check drive belt for wear and proper tension.

NOTE - If owner reports insufficient cooling, the unit should
be gauged and refrigerant charge checked. Refer to section
on refrigerant charging in this instruction.

Refer to the Engineering
Handbook for optional
accessories that may apply to this unit. The following may
or may not apply:
•

Compressor monitor

•
•
•

Compressor crankcase heater
Mounting bases
Stand-off Kit

•
•

Sound cover
Low ambient kit

•
•

Mild ambient kit
Monitor kit

•

Two-stage Lennox Room Thermostat

Page 26
505330M

02/08

crowding the unit cause the outdoor unit to work harder
and use more energy, Keep shrubbery trimmed away
from the unit and periodically check for debris which
collects around the unit,

Inordertoensurepeakperformance,
yoursystemmustbe
properlymaintained.
Cloggedfiltersandblockedairflow
preventyourunitfromoperating
at itsmostefficientlevel.
1, Air Filter--AskyourLennoxdealertoshowyouwhere
yourindoorunit'sfilterislocated.It willbeeitheratthe
indoorunit(installed
internalorexternaltothecabinet)
or behinda returnairgrilleinthewallor ceiling.Check
thefiltermonthlyandcleanor replaceitas needed,
2, Disposable Filter--Disposablefilters should be
replaced
witha filterofthesametypeandsize,

When removing debris from around the unit, be aware
of metal edges on parts and screws, Although special
care has been taken to keep exposed edges to a
minimum, physical contact with metal edges and
corners while applying excessive force or rapid motion
can result in personal injury,
Cleaning of the outdoor unit's coil should be performed
by a trained service technician. Contact your dealer
and set up a schedule (preferably twice a year, but at
least once a year) to inspect and service your air
conditioning or heat pump system.

NOTE - If you are unsure about the filter required for
your system, call your Lennox dealer for assistance.

IMPORTANT

HEAT PUMP OPERATION
Your new Lennox heat pump has several characteristics
that you should be aware of:
•

Heat pumps satisfy heating demand by delivering
large amounts of warm air into the living space, This
is quite different from gas- or oil-fired furnaces or an
electric furnace which deliver lower volumes of
considerably hotter air to heat the space.

•

4. Electronic
Air
Cleaner--Some
systems
are
equipped with an electronic air cleaner, designed to
remove airborne particles from the air passing through
the cleaner. If your system is so equipped, ask your
dealer for maintenance instructions.

Do not be alarmed if you notice frost on the outdoor coil
in the winter months. Frost develops on the outdoor
coil during the heating cycle when temperatures are
below 45°F (7°C). An electronic control activates a
defrost cycle lasting 5 to 15 minutes at preset intervals
to clear the outdoor coil of the frost,

•

5. Indoor Unit--The
indoor unit's evaporator coil is
equipped with a drain pan to collect condensate
formed as your system removes humidity from the
inside air. Have your dealer show you the location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)

During the defrost cycle, you may notice steam rising
from the outdoor unit. This is a normal occurrence. The
thermostat may engage auxiliary heat during the
defrost cycle to satisfy a heating demand; however,
the unit will return to normal operation at the
conclusion of the defrost cycle,

EXTENDED POWER OUTAGE

3, Reusable Filter--Many
indoor units are equipped
with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
filter to dry completely before returning it to the unit or
grille.
NOTE - The filter and all access panels must be in place
any time the unit is in operation.

The heat pump is equipped with a compressor crankcase
heater which protects the compressor from refrigerant
slugging during cold weather operation,

IMPORTANT

If power to your
or more, set
EMERGENCY
without the risk

6, Outdoor Unit--Make
sure no obstructions restrict
airflow to the outdoor unit, Leaves, trash or shrubs

unit has been interrupted for several hours
the room thermostat selector to the
HEAT setting to obtain temporary heat
of serious damage to the heat pump,

In Emergency Heat mode, all heating demand is satisfied
by auxiliary heat; heat pump operation is locked out. After a
six-hour compressor crankcase warm-up period, the
thermostat can be switched to the HEAT setting and
normal heat pump operation may resume,

Page27
SPB*H4

SERIES

Though your thermostat may vary somewhat from the
description below, its operation will be similar,
TEMPERATURE

SETTING LEVERS

Most heat pump thermostats have two temperature
selector levers: one for heating and one for cooling. Set the
levers or dials to the desired temperature setpoints for both
heating and cooling.
Avoid frequent
temperature
adjustment; turning the unit off and back on before
pressures equalize puts stress on the unit compressor,
FAN SWITCH
In AUTO or INT (intermittent) mode, the blower operates
only when the thermostat calls for heating or cooling, This
mode is generally preferred when humidity control is a
priority. The ON or CONT mode provides continuous
indoor blower operation, regardless of whether the
compressor or auxiliary heat are operating. This mode is
required when constant air circulation or filtering is desired.

INDICATING LIGHT
Most heat pump thermostats have an amber light which
indicates when the heat pump is operating in the
emergency heat mode.
TEMPERATURE INDICATOR
The temperature indicator displays the actual room
temperature,
PROGRAMMABLE
THERMOSTATS
Your Lennox system
may be controlled
by a
programmable thermostat. These thermostats provide the
added feature of programmable time-of-day setpoints for
both heating and cooling, Refer to the user's information
manual provided with your particular thermostat for
operation details,
PRESERVlCE CHECK
If your system fails to operate, check the following before
calling for service:
•
Check to see that all electrical disconnect switches are
ON.
•
•

SYSTEM SWITCH
Set the system switch for heating, cooling or auto
operation. The auto mode allows the heat pump to
automatically switch from heating mode to cooling mode to
maintain predetermined
comfort settings, Many heat
pump thermostats are also equipped with an emergency
heat mode which locks out heat pump operation and
provides temporary heat supplied by the auxiliary heat,

•
•
•
•

Make sure the room thermostat temperature selector
is properly set.
Make sure the room thermostat system switch is
properly set,
If you discover any blown fuses or tripped circuit
breakers, call your Lennox dealer for assistance,
Make sure unit access panels are in place,
Make sure air filter is clean,
Locate unit model number and have it handy before
calling,

Job Name

Job no.

Date

Job Location

City

State

Installer

City

State

Unit Model No,

Serial No.

Service Technician

Nameplate Voltage
Rated Load Ampacity
Maximum Fuse or Circuit Breaker

Compressor Amperage: 1st Stage

Electrical Connections Tight?
Indoor Filter clean?
Indoor Blower RPM
S.P. Drop Over Indoor (Dry)

:_]

2nd Stage:

Supply Voltage (Unit Off)
Outdoor Coil Entering Air Temp.

COOLING (2ND STAGE)
Liquid Line Pressure:

Vapor Pressure:

Refrigerant Charge Checked?

Liquid Line Pressure:

Vapor Pressure:

Refrigerant Charge Checked?

Vapor Pressure; 1st Stage:

2nd Stage:

HEATING (2ND STAGE)

Refrigerant

Lines: - Leak Checked?

Service Valves:

---

Fully Opened?

SEQUENCE
Heating Correct?

Properly Insulated?

Caps Tight?

02/08

Voltage With Compressor Operating
THERMOSTAT

OF OPERATION
Calibrated?

Cooling Correct?

Page 28
505330M

Outdoor Fan Checked?

Properly Set? _

Level?

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Author                          : 
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LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806500

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