LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806499

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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INSTALLATION
INSTRUCTIONS

,t_2006 Lennox industries Inc,
Dallas, Texas, USA

SPA Units
SPA036H4

(3 Ton)

SPA048H4 (4 Ton)
SPA060H4 (5 Ton)
S-CLASS " HEAT PUMP
504,867M
06/06
Supersedes 03/06

WARNING

CAUTION

The S-Class '" SPA outdoor units use R-410A HFC refrigerant. This unit must be installed with a matching indoor
coil and line set as outlined in the Lennox Engineering
Handbook. SPA outdoor units are designed for use in expansion valve (TXV) systems only. They are not designed
to be used with other refrigerant flow control devices. The
Lennox Engineering Handbook lists indoor TXV kits that
must be ordered separately.

IIIIIIIIIIIIIIIIIIIIIIIIIIIIHIIIIIIII

)puTeChn i cal
blications
Litho U.S.A.

SPA Outdoor Unit .............................
Shipping and Packing List ......................
General Information ...........................
Unit Dimensions ...............................
Parts Arrangement ............................
Setting the Unit ...............................
Electrical .....................................
Refrigerant Piping .............................
Refrigerant Metering Device ....................
Flushing Existing Line Set & Indoor Coil ..........
Manifold Gauge Set ...........................
Service Valves ................................
Leak Testing ..................................
Evacuation ...................................
Start-Up ......................................
Refrigerant Charging ...........................
System Operation .............................
Defrost System ...............................
Maintenance ..................................
Optional Accessories ..........................
Start-Up and Performance Check List ............
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE

A IMPORTANT

06/06

UNITS

1
1
1
2
2
3
4
6
8
8
10
10
11
12
12
13
16
17
18
18
20

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

Assembled SPA outdoor unit
Grommets (for liquid and vapor lines)
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.

Page 1

504,867M

IIIIIIIIIIIIIIIIIIIIIIIIIIIIII

INLETAIR

Model

Dimension

SPA036

SPA048/060

A
B
C
D

Inches
30-7/8
32-1/8
34-1/16
12-3/4

mm
784
816
865
324

Inches
44-7/8
32-1/8
34-1/16
14-1/4

mm
1140
816
865
362

E
F
G
H
J

26-5/8
18-5/8
28-1/8
17-1/4
3-7/8

676
473
718
438
98

26-5/8
18-5/8
28-1/8
18-3/4
3-7/8

676
473
718
476
98

7-1/2

191

7-1/2

191

TOP
VIEW

INLET
AIR

INLETAIR
COMPRESSOR

COIL DRAIN OUTLETS
(Around perimeter of base)

ELECTRICAL
INLETS

VAPOR

DISCHARGEd&.
AIR
BB
C

INLET

SIDE
VIEW

1/2(114)

..............................................................................
...............................
..........................

:: :__::_:;;
..................
..............................................

LIQUID
LINE
INLET

F ----'1_"_

A 1102).

2-3/4(70)
2 (51)

1-3/8 (35)

2 (51)

_
I::

_ 16-1/161
"Yl (154)

INDEPENDENT
MOTOR MOUNT
RUN
CAPACITOR

CONTACTOR

DEFROST
CONTROL

TWO-STAGE
COMPRESSOR

DISCHARGE
LINE
COMPRESSOR
TERMINAL PLUG

VAPOR VALVE AND
GAUGE PORT
LOW PRESSURE
SWITCH

TXV/CHECK
VALVE

FILTER DRIER

VAPORLINE

CRANKCASE
HEATER

DISCHARGE
TEMPERATURE
THERMOSTAT

HIGH PRESSURE
SWITCH

Page 2
504867M

06/06

1, Place a sound-absorbing material, such as Isomode,
under the unit if it will be installed in a location or position that will transmit sound or vibration to the to the
conditioned space.
2, Mount unit high enough above ground or roof to allow
adequate drainage of defrost water and prevent ice
build-up,
3, In heavy snow areas, do not locate unit where drifting
will occur. The unit base should be elevated above the
depth of average snows,
NOTE - Elevation of the unit may be accomplished by
constructing a frame using suitable materials. If a support frame is constructed, it must not block drain holes
in unit base.

WARNING

4, When installed in areas where low ambient temperatures exist, locate unit so winter prevailing winds do
not blow directly into outdoor coil.
5, Locate unit away from overhanging roof lines which
would allow water or ice to drop on, or in front of, coil
or into unit,
Slab Mounting

CAUTION
These units operate under a wide range of weather conditions; therefore, several factors must be considered when
positioning the outdoor unit. The unit must be positioned to
give adequate clearances for sufficient airflow and servicing, Refer to figure 1 for installation clearances.

When installing unit at grade level, top of slab should be
high enough above the grade so that water from higher
ground will not collect around unit, See figure 2. Slab
should have a slope tolerance away from the building of 2
degrees or 2 inches per 5 feet (51 mm per 1,5 m), This will
prevent ice build-up under unit during a defrost cycle. Refer to roof mounting section for barrier construction if unit
must face prevailing winter winds,
Slab Mounting
2 degrees

Installation

2 in. per 5 foot
(51 mm per 1.5 m)
slope tolerance away
from building structure

Clearances

AS NOTED

DISCHARGE
AIR
A

-L[

BUILDING
STRUCTURE

:21-

ZZCL
(762
mm)
36"

CZ-

AS NOTED
_}
GROUND
LEVEL
I

Figure 2

AS NOTEDj

NOTE - A service access clearance of 30" (762 mm)
must be maintained in front of the service access panel.
Clearance to one side must be 36" (914 mm). Clearance
to one of the remaining two sides may be 12" (305 mm)
and the final side may be 6" (152 mm).
NO TE - A clearance of 24" (610 mm) must be maintained
between two units.
NOTE - 48" (1219 mm) clearance required on top of unit.
Maximum soffit overhang is 36" (914 mm).
Figure

Roof Mounting
Install the unit a minimum of 6 inches (152 mm) above the
roof surface to avoid ice build-up around the unit. Locate
the unit above a load bearing wall or area of the roof that
can adequately support the unit, Consult local codes for
rooftop applications.
If unit coil cannot be mounted away from prevailing winter
winds, a wind barrier should be constructed. See figure 3.
Size barrier at least the same height and width as outdoor
unit, Mount barrier 24 inches (610 mm) from the sides of
the unit in the direction of prevailing winds,

Page 3
SPA SERIES

Rooftop

Application

prevailir_Rer

with Wind

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

winds

wind barrier inlet
air

Refer to figure 4 for high voltage field wiring diagram.
NOTE -A complete unit wiring diagram is located inside the unit's access door.

Barrier

(610 ram)
24"

1
/r',

•

Insulation

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).

WARNING

less than 100' (30m)

color-coded, temperature

more than 100' (30m)

rating 35°C minimum

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:
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.
Typical

Field Wiring

Diagram

A 108
C

FAN _

DEFROST

OUT

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.

OUTDOOR
rAN
/

2. Ground unit at unit disconnect switch or to an earth
ground.
NOTE - Connect conduit to the unit using a proper
conduit fitting.
NO TE - Units are approved for use only with copper
conductors.

Page 4
06/06

I _

BROUND
CONTROL
K 195

LU6

sz_
SPEED

"
LI
LZ

L
ORAN6E-COM_ON

_-PS

PURPLE =
\_'_

C_]TOR

?[L

cI
CAPACITOR

=RV_---L

2081

230/
3/60

o
COMPRESSOR
CONTACTOR
K'

1. Install line voltage power supply to unit from a properly
sized disconnect switch.

504867M

type

4. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit. See figure 7.
NOTE - 24V, Class II circuit connections are made in
the low voltage junction box.

inlet air

Figure

AWG #

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.

inlet air

k_J

I
I

Wire run length

-0UT

For
coppercircuit
conductors
to Unitovercurrating
plateuse
for with
minimum
ampacityonly
andRefer
maximum
rent protection size.
A

ARNING! ELECTRIC SHOCK HAZARD! Can cause
injury or death. Unit must be grounded in accordance with
national and local codes.

Figure

Outdoor Unit, Blower Unit,
Thermostat
Designations
Indoor Unit
TB1

SPA

Outdoor Unit, CB31MV/CB32MV,
Thermostat
Designations
(Some connections may not apply,
Refer to specific thermostat and indoor unit.)

A2 Thermostat

SPA

CB31MV
CBX32MV
TB1

(Some connections
may not apply.
Refer to specific
thermostat and indoor unit,)

T7300G
Thermostat
A2

®1

@-©--

©E
GE
@E

©-@--

]

I _>
I @-

@1
@1

@1
©1
©1

©-Figure

Figure 6
Typical
$4
HiGH
PRESSURE
SWITCH

$5
DISCH
LIMIT

SZ3
LOW
AMBIENT
COMPRESSOR
THERMOSTAT If¢7_,#_,/_%_I

DI_

TEMP

©©

z:_

AMBIENT
SENSOR

©@
L_

RT21
DEFROST
COIL
SENSOR

RTIS

$87 LOW
LI
PRESSURE REVERSING
SWITCH
VALVE

SPA Wiring

z_ MOTEFOR USE WITH

Z_
A
_

COPPER
CONDUCTORS
ONLY,REFER
TO UNIT RATING
PLATE FOR MINIMUM CIRCUIT
AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE

REMOVE JUMPER

RTI4

REFER TO COMPRESSOR IN UNIT
FOR ACTUAL TERMINAL
ARRANGEMENT.
WARNINGELECTRIC
SHOCK HAZARD,CAN
CAUSE
INJURY
OR DEATH,UNIT
MUST BE GROUNDED
IN

$25 CLOSES
TO OPERATE
ON HEATING

SII

L34,SECOND
STAGE, SOLENOID
COMPRESSOR.
COIL IS 24VOC,
24VAO TO COIL TERMINALS.

FOR TWO

SENSOR,OUTDOOR

AND

STAGE

TEMP

COOL

(OPTIONAL}

AT LOW AMBIENT
TEMPERATURES
SECOND STAGE COMPRESSOR

K58

ARE

OPTIONAL

LOW

AMBIENT

-,,e-_DENOTES
COMPONENTS
ACCORDANCE WITH OPTIONAL
NATIONAL
AND LOCAL CODES,
-LINE VOLTAGE FIELD
INSTALLED
-- --CLASS II VOLTAGE FIELD
INSTALLED

,C_

T7300F
THERMOSTAT
60L59
82N52

CB31MV
CBXS2MV
TBI

Be
FAN

CE
CAPACITOR

A_._

LE
HR I

CONTACT0

_TA6rl

W
K2

]
]
C

)"L

CONTROLS

IS LOCATED
IN
DO NOT CONNECT

(B)
@--

y;i

--{G>I

-{cYqs
-@ [

BE_
+________
] RV

AMB

rIo£
_

EQUIPMENT
GROUND

c......................................
I1 ?

KI-I

RTI3

Figure

Page 5
SPA SERIES

necessary vibration. Line set contact with the structure
(wall, ceiling or floor) causes some objectionable noise
when vibration is translated into sound, As a result, more
energy or vibration can be expected, Closer attention to
line set isolation must be observed,

If the SPA unit is being installed with a new indoor coil and
line set, the refrigerant connections should be made as
outlined in this section. If an existing line set and/or indoor
coil is going to be used to complete the SPA system, refer
to the following section which includes flushing procedures,

Following are some points to consider when placing and
installing a high-efficiency outdoor unit:
1. Placement - Be aware some localities are adopting
sound ordinances based on how noisy the unit is from
the adjacent property not at the original installation.
Install the unit as far as possible from the property line.
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound transmission,

Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections) to the indoor coil
(flare or sweat connections). Use Lennox L15 (sweat, nonflare) series line sets as shown in table 1 or use field-fabricated refrigerant lines. Valve sizes are also listed in table 1.
Table
Refrigerant

Line Sets

Valve Field Size
Connections

Recommended

Line Set
L15
Line Sets

Liquid
Line

Vapor
Line

Liquid
Line

Vapor
Line

036

3t8 in.
10 mm

7/8 in.
22 mm

3/8 in.
10 mm

7/8 in.
22 mm

048

3t8 in.
10 mm

7/8 in.
22 mm

3/8 in.
10 mm

7/8 in.
22 mm

060

3t8in.
10 mm

1-1/8in.
29 mm

3/8 in.
10 mm

1-1/8 in.
29 mm

Model

2. Line Set Isolation - The following illustrations demonstrate procedures which ensure proper refrigerant line
set isolation. Figure 8 shows how to place the outdoor
unit and line set. Figure 9 shows how to install line sets
on horizontal runs. Figure 10 shows how to make a
transition from horizontal to vertical. Figure 11 shows
how to install line sets on vertical runs.

Outside

L15-65
15-50 ft.
4.6-15m

Unit Placement

and Installation

INSTALL UNIT AWAY _
FROM WINDOWS.

Field
Fabricated

Refrigerant
Line Set Connections
- SPA
Matched with New Indoor Coil and Line Set
If an existing indoor coil which was equipped with an RFCI
metering device is being replaced, the liquid line must also
be replaced prior to the installation of the SPA unit,
NOTE - Units are designed
(15 m).
Installing

Refrigerant

for line sets of up to 50 feet

Line

TWO 90 ° ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION.

During the installation of any heat pump system, it is important to properly isolate the refrigerant lines to prevent unRefrigerant

Figure

Line Sets: Installing

To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.

(Around vapor line only)

MATERIAL

(Around vapor line only),

FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE

8 feet

METAL
SLEEVE

FLOOR JOIST OR
ROOF RAFTER

TAPE OR WIRE TIE

Figure
Page 6
504867M

06/06

Runs

WIRE TIE
8 feet

STRAPPING

Horizontal

Strap the vapor line to the joist or
rafter at 8 ft. intervals then strap
the liquid line to the vapor line.

Refrigerant
ANCHORED

Line Sets:

Transition

HEAVY NYLON
WIRE TIE

From Vertical

AUTOMOTIVE

WALL
STUD

To Horizontal

MUFFLER-TYPE
HANGER

WALL
STUD
Strap Liquid Line
To Vapor Line

Strap Liquid Line
To Vapor Line

LIQUID LINE
METAL
SLEEVE

VAPOR LINE - WRAPPED
ARMAFLEX

Figure
Refrigerant

Line Sets: Installing

LIQUID LINE
METAL
SLEEVE

VAPOR LINE - WRAPPED IN
ARMAFLEX

Vertical

Runs (new construction

shown)

NO TE - Similar installation practices should be used if line set is to be installed on exterior of outside wall.
OUTSIDE WALL

IMPORTANT - Refrigerant
lines must not contact wall.

VAPOR LINE

UID LINE

-_.

WIRE TIE

INSIDE WALL

-- STRAP
SLEEVE
VAPOR LINE WRAPPED
WITH ARMAFLEX
[_--'"_

IMPORTANT!
Refrigerant
ines must not
contact
structure.

LIQUID
_-

WIRE TIE

LINE

---.--.----WOOD

.___----

BLOCK

WIRE TIE
STRAP

PVC PIPE

FIBERGLASS
INSULATION
SLEEVE

Figure 11
Page 7
SPA SERIES

Isolation

Grommets

Metering

Locate the provided isolation grommets. Use a knife to slit
the webbing on each grommet. Slide larger grommet onto
vapor line and smaller grommet onto liquid line. Insert
grommets into mullion to isolate refrigerant lines from
sheet metal edges,

o-ring

WARNING

Device Installation

distributor

o-ring

["""

strai-_--'_'_r,_,

liquid line
(_

Figure

expansion
valve

stub

IMPORTANT
Brazing

Connection

Procedure

1, Cut the end of the refrigerant line squarely; its internal
shape must remain round, Debur the inside and outside diameter and be sure line is free of nicks or dents,
2, Before making line set connections, use dry nitrogen
to purge the refrigerant piping. This helps prevent oxidation and introduction of moisture into the system,

AWARNING

3, Use silver alloy brazing rods (5 or 6 percent minimum
silver alloy for copper-to-copper brazing or 45 percent
silver alloy for copper-to-brass
or copper-to-steel
brazing). Wrap a wet cloth around the valve body and
the copper tube stub. Remove light maroon washers
from service valves and shield light maroon stickers in
order to protect them during brazing. Braze the line set
to the service valve,
4. Quench the joint with water or a wet cloth to prevent
heat damage to the valve core and opening port,

NOTE - If the indoor unit line and set are new, skip this section and go on to the Manifold Gauge Set section.

IMPORTANT

A IMPORTANT

SPA units are used in check expansion valve systems only.
See the Lennox Engineering Handbook for approved TXV
match-ups and application information,
Check expansion valves equipped with Chatleff fittings are
available from Lennox. Refer to the Engineering Handbook for applicable expansion valves for use with specific
match-ups,
If installing a check expansion valve with an indoor coil that
includes a fixed orifice, remove the orifice before installing
the check expansion valve.
See figure 12 for indoor check expansion valve installation,

Page 8
504867M

06/06

Flushing

Connections
INVERTED HCFC-22 CYLINDER
/
/
i

(Contains clean HCFC-22 to be used for flushing)
NOTE - The inverted HCFC-22 cylinder must contain
at least the same amount of refrigerant as was recov-

"x.]__J

ered from the existing system.

f ---- PREsLuO
"'#E SURE

VAPOR LIN_E_,
EXISTING VAPOR LINE
INDOOR
COIL

SERVICE VALVE

"_
EXISTING LIQUID LINE

ANK RETURN

SPA UNIT

(/_
,_1

('_

G_UGEMAN_p_

o " ol1
11
c os o

RECOVERY
MACHINE

CYLINDER
INLET

RECOVERY@

LIQUID

Figure

CAUTION

Required

Equipment

You will need the following equipment in order to flush the
existing line set and indoor coil: two clean R-22 recovery
bottles, an oilless recovery machine with a pump down feature, and two sets of gauges (one for use with R-22 and
one for use with R-410A).

refrigerant evacuation,)
When the low side system
pressures reach 0 psig, close the vapor line valve. Disconnect all power to the existing outdoor unit, Refer to
gauges after shutdown to confirm that the valves are
not allowing refrigerant to flow back into the low side of
the system. Disconnect the liquid and vapor lines from
the existing outdoor unit,
Remove the existing outdoor unit, Set the new R-410A
unit and follow the brazing connection procedure
which begins on the previous page to make line set
connections, DO NOT install metering device at this
time.
Make low voltage and line voltage connections to the
new outdoor unit. DO NOT turn on power to the unit
or open the outdoor unit service valves at this
time.

Flushing Procedure
1, Remove existing R-22 refrigerant using the appropriate procedure below.
ff 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 R-22 refrigerant
to flush the system -- Disconnect all power to the existing outdoor unit. Connect the existing unit, a clean
recovery cylinder and the recovery machine according
to the instructions provided with the recovery machine.
Remove all R-22 refrigerant from the existing system.
Refer to gauges after shutdown to confirm that the entire system is completely void of refrigerant. Disconnect the liquid and vapor lines from the existing outdoor unit,
If the existing outdoor unit is equipped with
manual shut-off valves AND you plan to use NEW
R-22 refrigerant to flush the system -- Start the existing R-22 system in the cooling mode and close the
liquid line valve. Pump all of the existing R-22 refrigerant back into the outdoor unit, (It may be necessary to
bypass the low pressure switches to ensure complete

A IMPORTANT

3. Remove the existing refrigerant flow control orifice or
thermal expansion/check valve before continuing with
flushing procedures. The existing devices are not approved for use with R-410A refrigerant and may prevent proper flushing, Use a field-provided fitting to reconnect the lines.
4. Remove the pressure tap valve cores from the SPA
unit's service valves, Connect an R-22 cylinder with
clean refrigerant to the vapor service valve. Connect
the R-22 gauge set to the liquid line valve and connect
a recovery machine with an empty recovery tank to the
gauge set,

Page 9
SPA SERIES

5, 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 coil,

Liquid Line Service
SERVICE
PORT CAP

6. Invert the cylinder of clean R-22 and open its valve to
allow liquid refrigerant to flow into the system through
the vapor line valve. Allow the refrigerant to pass from
the cylinder and through the line set and the indoor coil
before it enters the recovery machine,

Insert hex

STEM
CAP

7, After all of the liquid refrigerant has been recovered,
switch the recovery machine to vapor recovery so that
all of the R-22 vapor is recovered,

To
indoor coil

(Valve Closed)

NOTE - A single system flush should remove all of the
mineral oil from the existing refrigerant lines and indoor coil, A second flushing may be done (using clean
refrigerant) if insufficient amounts of mineral oil were
removed during the first flush, Each time the system
is flushed, you must allow the recovery machine
to pull a vacuum on the system at the end of the
procedure.

To outdoor coil

SERVICE PORT
SERVICE
PORT CAP
VALVE
CORE
wrench here
STEM
CAP

8. Close the valve on the inverted R-22 drum and the
gauge set valves. Pump the remaining refrigerant out
of the recovery machine and turn the machine off,

Service port Is open to line
set when valve is closed
(front seated)

9, Use nitrogen to break the vacuum on the refrigerant
lines and indoor coil before removing the recovery machine, gauges and R-22 refrigerant drum, Reinstall
pressure tap valve cores into SPA service valves,
10, Install the provided check/expansion valve (approved
for use with R-410A refrigerant) in the liquid line at the
indoor coil,

Valve

SERVICE PORT

To
indoor coil

(Valve

To outdoor coil

Figure

Open)

Table 2
Torque

Requirements

Part

Recommended

Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap

8 ft.- lb.
16 in.- lb.
28 in.- lb.
90 in.- lb.
8 ft.- lb.

A IMPORTANT

Torque
11 NM
2 NM
3 NM
10 NM
11 NM

A IMPORTANT

To Access

Schrader

Port:

1, Remove service port cap with an adjustable wrench,
2. Connect gauge to the service port.
3, When testing is complete, replace service port cap,
Tighten finger tight; then tighten per table 2,
The service valves (liquid line - figure 14, vapor line - figures 15 and 16) and gauge ports are used for leak testing,
evacuating, charging and checking charge. Each valve is
equipped with a service port which has a factory-installed
Schrader valve. A service port cap protects the Schrader
valve from contamination and serves as the primary leak
seal.

To Open and Close Service Valve:
1. Remove stem cap with an adjustable wrench.

Page 10
504867M

06/06

2, Using service wrench and hex head extension (3/16"
extension for liquid line sizes), back the stem out counterclockwise as far as it will go.
3, Replace stem cap and tighten it firmly, Tighten finger
tight; then tighten per table 2,

To Close

Service Valve:

WARNING

1. Remove stem cap with an adjustable wrench,
2. Using service wrench and hex head extension (3/16"
extension for fiquid line sizes), turn stem clockwise to
seat valve, Tighten it firmly.
3, Replace stem cap, Tighten finger tight; then tighten per
table 2,
Vapor

WARNING

Line Ball Valve

Ball-type service valves (figures 15 and 16) function the
same way as the other valves but cannot be rebuilt; if one
fails, replace with a new valve. The ball valve is equipped
with a service port with a factory-installed Schrader valve.
A service port cap protects the Schrader valve from contamination and assures a leak-free seal.

Bali-Type

Vapor

Valve

WARNING

(Valve Open)
TO

SERVICE
PORT CAP

USE ADJUSTABLE WRENCH
TO CLOSE: ROTATE STEM
CLOCKWISE
90°.
TO OPEN: ROTATE STEM
COUNTER-CLOCKWISE

COIL
OUTDOOR

SCHRADER

90 °.
SERVICE
PORT

Using an Electronic
Leak Detector
1. Connect a cylinder of R-410A to the center port of the
manifold gauge set,
2. With both manifold valves closed, open the valve on
the R-410A cylinder (vapor only),
3. Open the high pressure side of the manifold to allow
the R-410A into the line set and indoor unit, Weigh in
a trace amount of R-410A, [A trace amount is a maximum of 2 ounces (57 g) or 3 pounds (31 kPa) pressure,] Close the valve on the R-410A cylinder and the
valve on the high pressure side of the manifold gauge
set, Disconnect the R-410A cylinder,
4. Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge set,
5. Connect the manifold gauge set high pressure hose to
the vapor valve service port. (Normally, the high pressure hose is connected to the liquid line port; however,
connecting # to the vapor port better protects the manifold gauge set from high pressure damage,)
6. Adjust the nitrogen pressure to 150 psig (1034 kPa),
Open the valve on the high side of the manifold gauge
set which will pressurize line set and indoor unit.

STEM

TO
INDOOR
COIL

BALL (SHOWN

OPEN)

Figure

Bali-Type

Vapor

Valve

(Valve

CAP
STEM

Closed)

TO
OUTDOOR

USE ADJUSTABLE
WRENCH
TO OPEN: ROTATE STEM
COUNTER-CLOCKWISE
TO CLOSE:

STEM

90°.

ROTATE STEM

CLOCKWISE

,%o

90 °.

COIL

s owN
_

S_ERVICE

PORT

_SCHRADER
COIL

VALVE

7. After a few minutes, open a refrigerant port to ensure
the refrigerant you added is adequate to be detected.
(Amounts of refrigerant will vary with line lengths.)
Check all joints for leaks, Purge nitrogen and R-410A
mixture. Correct any leaks and recheck.

SERVICE
PORT CAP

Figure

After the line set has been connected to the indoor and outdoor units, the line set connections and indoor unit must be
checked for leaks.

A IMPORTANT

Page 11
SPA SERIES

gauge valves to release the nitrogen from the line set
and indoor unit.
Evacuating the system of noncondensables is critical for
proper operation of the unit. Noncondensables are defined
as any gas that will not condense under temperatures and
pressures present during operation of an air conditioning
system. Noncondensables and water vapor combine with
refrigerant to produce substances that corrode copper piping and compressor parts.

A IMPORTANT

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.
When the absolute pressure requirement above has
been met, disconnect the manifold hose from the vacuum pump and connect it to an upright cylinder of
R-410A refrigerant. Open the manifold gauge valves
to break the vacuum from 1 to 2 psig positive pressure
in the line set and indoor unit. Close manifold gauge
valves and shut off the R-410A cylinder and remove
the manifold gauge set.

1. Connect the manifold gauge set to the service valve
ports as follows:
• low pressure gauge to vapor 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.

IMPORTANT

4. Open both manifold valves and start vacuum pump.
5. Evacuate the line set and indoor unit to an absolute
pressure of 23,000 microns (29,01 inches of mercury). 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 absolute pressure,
A rapid rise in pressure indicates a relatively large
leak. If this occurs, repeat the leak testing procedure.

2. Inspect all factory- and field-installed wiring for loose
connections.
3. After evacuation is complete, open the liquid line and
vapor line service valves (ccw) to release refrigerant
charge (contained in outdoor unit) into the system.
4. Replace stem caps and secure finger tight, then tighten an additional (1/6) one-sixth of a turn,
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit
nameplate. If not, do not start the equipment until the
power company has been consulted and the voltage
condition has been corrected.

NOTE - "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 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.

6. Set the thermostat for a cooling demand, turn on power to indoor blower unit and close the outdoor unit disconnect to start the unit,
7, Recheck voltage while the unit is running. Power must
be within range shown on the nameplate,

WARNING

1, Rotate fan to check for frozen bearings or binding.

Three-Phase
Compressor
Rotation
Three-phase scroll compressors must be phased sequentially to ensure correct compressor rotation and operation.
At compressor start-up, a rise in discharge and drop in vapor pressures indicate proper compressor phasing and operation. If discharge and vapors pressures do not perform
normally, follow these steps to correctly phase in the unit:
1. Disconnect power to the unit.
2. Reverse any two field power leads to the unit.
3. Reapply power to the unit.

7. Shut off the nitrogen cylinder and remove the manifold
gauge hose from the cylinder. Open the manifold

Discharge and vapor pressures should operate at their
normal start-up ranges.

Page 12
504867M

06/06

SPA Cooling

Cycle (Showing

r
i
i
EXPANSION/

CHECK

Manifold

Connections)

OUTDOOR

UNIT
NOTE _ARROWS
INDICATE
DIRECTION OF REFRIGERANT

REVERSING

FLOW

VALVE

I
BIFLOW

VALVE

DRIER
LOW
PRESSURE

Gauge

DISTRIBUTOR

HIGH
PRESSURE

OUTDOOR

COIL

X
M U FLL__"-

INDOOR_L]

III

J
COMPRESSOR

NOTE - Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant
lines and indoor coil. Use vapor gauge port to measure vapor pressure during charging,

Figure

17
The compressor is charged with sufficient polyol ester oil
for line set lengths up to 50 ft, The outdoor unit should be
charged during warm weather. However, applications
arise in which charging must occur in the colder months.
The method of charging is determined by the outdoor ambient temperature. Measure the liquid line temperature
and the outdoor ambient temperature as outlined below:

A IMPORTANT

1. Connect manifold gauge set to service valves as
shown in figure 17:
• low pressure gauge to vapor valve service port
• high pressure gauge to liquid valve service port
Connect the center manifold hose to an upright cylinder of R-410A. Close manifold gauge set valves.
2. Set the room thermostat to call for heat. This will
create the necessary load for properly charging the
system in the cooling cycle,
3. Use a digital thermometer to record the outdoor ambient temperature.
4. When the heating demand has been satisfied, switch
the thermostat to cooling mode with a set point of 68 _F
(20_%). When pressures have stabilized, use a digital
thermometer to record the liquid line temperature.

System is charged with R-410A refrigerant and operates at
much higher pressures than R-22. The field-provided
check/expansion valve for indoor unit must be approved
for use with R-410A. This unit is NOT approved for use with
coils which include metering orifices or capillary tubes,
Processing
Procedure
The unit is factory-charged with the amount of R-410A refrigerant indicated on the unit rating plate, This charge is
based on a matching indoor coil and outdoor coil with a 15
foot (4,6 m) line set. For varying lengths of line set, refer to
table 3 for refrigerant charge adjustment,
Table
Refrigerant

Charge

5. The outdoor temperature will determine which charging method to use, Proceed with the appropriate
charging procedure,

per Line Set Lengths

Liquid Line
Set Diameter

Oz. per 5 ft. (g per 1.5 m) adjust
from 15 ft. (4.6 m) line set*

3/8 in, (9,5 mm)

3 ounce per 5 ft, (85 g per1,5 m)

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

Weighing
in the Charge - Outdoor Temperature
< 65°F (18°0)
If system is void of refrigerant, or if the outdoor ambient
temperature is cool, the refrigerant charge should be
weighed into the unit after any leaks are repaired:

A IMPORTANT

1. Recover the refrigerant from the unit,
2. Conduct a leak check, then evacuate as previously
outlined,
3. Weigh in the unit nameplate charge.

Page 13
SPA SERIES

Table 4

If weighing facilities are not available or if you are charging
the unit during warm weather, follow one of the other procedures outlined below.
Subcooling
Method
< 65°F (18°C)

- Outdoor

R-410A Temp.

Temperature

When the outdoor ambient temperature is below 65°F
(18°C), use the subcooling method to charge the unit. It
may be necessary to restrict air flow through the outdoor
coil to achieve pressures in the 325-375 psig (2240-2585
kPa) range--higher pressures are necessary for checking
the charge. Block equal sections of air intake panels and
move obstructions sideways until the liquid pressure is in
the 325-375 psig (2240-2585 kPa) range. See figure 18.
Blocking

_Y
If [I
]),11
__

I
I
I

Outdoor

Coil

side at a time with cardboard
or plastic sheet until proper testing
.P
rF:Su_.U:ied:
d r:nri___ho
evdn''

)-...

*Outdoor coil should be blocked one
CARDBOARD

Figure

OR PLASTIC SHEET

1. With the manifold gauge hose still on the liquid service
port and the unit operating stably, use a digital thermometer to record the liquid line temperature.
2. At the same time, record the liquid line pressure reading.
3. Use a temperature/pressure chart for R-410A (table 4)
to determine saturation temperature for the liquid line
pressure reading.
4. Subtract the liquid line temperature from the saturation
temperature (from table 4) to determine subcooling.
(Saturation temp. - Liquid line temp. = Subcooling)
5. Compare the subcooling value with those in table 5. If
subcooling is greater than shown, recover some refrigerant. If subcooling is less than shown, add some refrigerant. Be aware of the R-410A refrigerant cylinder.
It will be light maroon-colored. Refrigerant should be
added through the vapor line valve in the liquid state.
NOTE - Some R-410A cylinders are equipped with a
dip tube that allows you to draw liquid refrigerant from
the bottom of the cylinder without turning the cylinder
upside-down. The cylinder will be marked if it is
equipped with a dip tube.

06/06

(Psig) Chart

°F

Psig

°F

Psig

°F

Psig

°F

Psig

100.8

178.5

290.8

125

445.9

102.9

181.6

295.1

126

451.8

105.0

184.3

299.4

127

457.6

107.1

187.7

303.8

128

463.5

109.2

190.9

308.2

129

469.5

111.4

194.1

312.7

130

475.6

113.6

197.3

100

317.2

131

481.6

115.8

200.6

101

321.8

132

487.8

118.0

203.9

102

326.4

133

494.0

120.3

207.2

103

331.0

134

500.2

122.6

210.6

104

335.7

135

506.5

125.0

214.0

105

340.5

136

512.9

127.3

217.4

106

345.3

137

519.3

129.7

220.9

107

350.1

138

525.8

132.2

224.4

108

355.0

139

532.4

134.6

228.0

109

360.0

140

539.0

137.1

231.6

110

365.0

141

545.6

139.6

235.3

111

370.0

142

552.3

142.2

239.0

112

375.1

143

559.1

144.8

242.7

113

380.2

144

565.9

147.4

246.5

114

385.4

145

572.8

150.1

250.3

115

390.7

146

579.8

152.8

254.1

116

396.0

147

586.8

155.5

258.0

117

401.3

148

593.8

158.2

262.0

118

406.7

149

601.0

161.0

266.0

119

412.2

150

608.1

163.9

270.0

120

417.7

151

615.4

166.7

274.1

121

423.2

152

622.7

169.6

278.2

122

428.8

153

630.1

172.6

282.3

123

434.5

154

637.5

175.4

286.5

124

440.2

155

645.0

Table 5
Subcooling

Values

for Charging

Model
Number

Second Stage (High Capacity)
Subcooling Values Conversion
- Liquid Line Temp. °F (°C)

SPA036

8.5 + 1 (4.7 + .5)

SPA048

7.5 + 1 (4.1 + .5)
7.0 + 1 (3.9 + .5)

SPA060

Page 14
504867M

(°F) - Pressure

Temp.

Charging Using

Normal Operating Pressures
&
Approach
Method - Outdoor Temp. >65<_F (18°C)
The following procedure is intended as a general guide and
is for use on expansion valve systems only. For best results, indoor temperature should be 70°F (21°C) to 80°F
(26°C). Monitor system pressures while charging.
1. Record outdoor ambient temperature using a digital
thermometer.

Table 7
Normal Operating Pressures - Cooling
Operation (Liquid +10 and Vapor +5 psig)*
SPA036
°F (°C)**

Liquid

IMPORTANT

Liquid

I Vapor

227

142

222

140

225

140

75 (23.9)

262

145

258

143

259

142

85 (29.4)

305

146

298

145

293

146

95 (35.0)

352

148

343

147

356

147

105 (40.6)

403

152

402

147

408

147

115 (46.1)

458

155

452

152

455

151

Second Stage (High Capacity)
65 (18.3)

244

136

232

134

249

126

75 (23.9)

282

139

266

136

289

134

85 (29.4)

325

142

309

139

330

140

95 (35.0)

377

144

359

142

378

143

105 (40.6)

428

146

410

144

433

146

115 (49.0)

488

148

468

147

492

are most-popular-match-up

up, indoor

air quality, and indoor

**Temperature

4. Use the digital thermometer used to check outdoor
ambient temperature to check liquid line temperature.
Verify the unit charge using the approach method.
5. The difference between the ambient and liquid temperatures should match values given in table 6--if not,
add refrigerant to lower the approach temperature or
recover refrigerant from the system to increase the approach temperature.
Table 6

Model
Number

I Vapor

65 (18.3)

*These

of the air entering

pressures.

149

Indoor

load cause pressures
the outside

match
to vary.

coil.

Table 8
Normal Operating Pressures:
Heating
Operation (Liquid +10 and Vapor +5 psig)*
SPA036
°F (°C)**

Liquid

I Vapor

SPA048
Liquid

SPA060

I vapor

Liquid

First Stage (Low Capacity)
40(4.4)
50
(10.0)

296
310

95
112

315
330

319
335

Second Stage (High Capacity)

Values for Charging

Second Stage (High Capacity)
Approach Temperature Liquid Line
Temp. - Outdoor Ambient °F (°C)

Liquid

SPA060

First Stage (Low Capacity)

2. Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize.
3. Compare stabilized pressures with those provided in
tables 7 and 8, "Normal Operating Pressures."

Approach

I Vapor

SPA048

20 (-6.6)

277

294

300

30 (-1.1)

296

303

312

40 (4.4)

321

314

323

50 (10.0)

341

104

325

106

339

SPA036

7.0 + 1 (3.9 + .5)

SPA048

8.0 + 1 (4.4 + .5)

up, indoor

SPA060

10.0 + 1 (5.6 + .5)

**Temperature

*These

are most-popular-match-up
air quality,

and indoor

of the air entering

pressures.

Indoor

load cause pressures
the outside

match
to vary,

coil.

Page 15
SPA SERIES

Emergency

Heat (Amber

Light)

An emergency heat function is designed into some room
thermostats. This feature is applicable when isolation d the
outdoor unit is required, or when auxiliary electric heat is
staged by outdoor thermostats. When the room thermostat is
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.
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.
Filter

The S23 has field-adjustable setpoints. Temperature differential (difference between cut-in/cut-out) is fixed (not
adjustable). Table 9 shows S23 thermostat setpoints. The
factory-set thermostat closes at 40+2°F on a temperature
drop and resets at 50+2°F on a temperature rise.
Regional climatic conditions may require the control to be adjusted to a different setting. The adjustment screw is located
on the bottom d the control box. A hole cut into the bottom
shelf of the control box provides access to the second stage
control adjustment screw from the compressor compartment. See figure 20.
Adjusting

Low Ambient

Thermostat

Adjustment screw can be
reached by inserting a screwdriver through
the slot in underside of control box.
Turn screw clockwise to increase
cut-in and cut-out setpoints

Brier

The unit is equipped with
which keeps the system
necessary, order another
replacement filter drier
R-410A refrigerant.
Low Ambient

a large-capacity biflow filter drier
clean and dry. If replacement is
of like design and capacity. The
must be suitable for use with
Figure 20

Thermostat

(second

stage)

$23

Table 9

The low ambient thermostat S23 (figure 19) is a SPST
thermostat and is located in the unit control box. The captube sensor is coiled adjacent to the control.

Low Ambient

Thermostat

Low Ambient Thermostat
Adjustable Range
Cut-in

Low Ambient

Thermostat

$23

(Close on Temperature Drop)
Cut-Out

SENSOR
(Cap-Tube)

TEMPERATURE

(Open on Temperature Rise)

Setpoints

Factory
Setting

Min.

Max.

40+2°F

37+2°F

55+2°F

50+2°F

47+2°F

65+2°F

Figure 21 shows the adjustment range of the control. Turn
adjustment screw clockwise to raise the switchover temperature and counterclockwise to lower the switchover
temperature.

Figure

19
Low Ambient

Thermostat
49
screw

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.

*SPA

43_

55
4_

adjustment

factory settingsX

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 S23 thermostat continually monitors the temperature
inside the control box. When the control box temperature
drops below the control setpoint, the control closes. When
the control closes, the contacts shunt across Y1 and Y2 inside the unit. When heating demand is present and the S23
is closed, the compressor will run in two-stage mode.

Figure

NOTE - This control is located in the compressor compartment. The ambient temperature sensed may be 10 °F to
15°F higher than the outdoor ambient. The temperature
sensed may vary because of long compressor run times,
continuous crankcase heater operation, or direct sunlight.
If this condition exists it can prevent the S23 from closing
and restrict the unit to low capacity heating when there is a
requirement for high capacity heat.

Page 16
504867M

06/06

Ambient

Compensation

Adjustments

SPA Defrost

•

CONNECTIONS

Heating

FAN _

REVERSING

24V

.//

\
COIL

II,d

Application

LO.P8
_

Temperature

Thermostat

Units are equipped with a discharge temperature thermostat that is located on the discharge line just below the muffler. The switch shuts off the compressor when the discharge line temperature rises above 250°F _+5 (121°C _+
-2,8) and resets at 200°F _+11 (93°C _+-6,1 ),
Demand Defrost System
The demand defrost controller uses basic differential temperature means to detect when the system performs poorly because of ice build-up on the outdoor coil. The controller also uses "self-calibrating" principles to calibrate itself
when the system starts and after every time the system defrosts. The control board has the following components:
defrost relays, anti-short cycle timed-off control, pressure
switch/safety control, 5-trip bckout circuit, manufacturing
test mode, ambient and coil temperature sensors, field selectable termination temperature pins, and a field low voltage connection terminal strip. See figure 22.

_{J

/P,NS
_j

AMBIENT
SENSOR

- Component

Locations

Will

Vary

With

Board

Manufacturer
Figure

Discharge

90 10

O-OUT

.STR,P

"CONNECT,O

_lf_

SENSOR

NOTE

;6 c:=_

control can be
wires. Because
point, temperathe control and

In single-stage heat applications, the low ambient thermostat can be set to the highest setting. The system will operate in second-stage heating when the temperature drops
below 55+ 2°F, and returns to first-stage when the temperature rises above 65 + 2°R The low-stage heating capacity
is approximates 70% of the high-stage heating capacity.

\
VALVE

the outdoor ambient temperature. (Keep capillary tube
away from direct sunlight).
Single-Stage

Board

i,ssovi,i

The factory setting of the S23 can be reset to a higher
temperature. This allows the controller to compensate
for the ambient temperature differences. (Control setting 65°K compartment 65°F - outdoor ambient 55°F).
Secondly, the capillary tube on the
routed with the low voltage thermostat
the capillary tube senses at its coldest
ture variation will be reduced between

Control

TEST PINS

In order to overcome this potential situation, there are two
possible adjustments:

The control monitors ambient temperature, outdoor coil
temperature and total run time to determine when a defrost
cycle is required. Two temperature probes are permanently attached to the control. 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.
Temperature probes cannot be removed from the control.
The control and the attached probes MUST be replaced as
a unit. Do not attempt to cut or splice probe wires.
Diagnostic
LEDs
The defrost board uses two LEDs for diagnostics. The
LEDs lasha specific sequenceaccording to thediagnostic
condition. See table 10.

Page 17
SPA SERIES

Low Pressure

Switch

(LO-PS)

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.

The unit's automatic reset low pressure switch ($87) is factory-wired into the defrost board on the LO-PS terminals,
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, ($87) is ignored under the following conditions:
•

during the defrost cycle and 90 seconds after the termination of defrost

Before the start of each heating and cooling season, the
following service checks should be performed by a qualified service technician,

•

when the average ambient sensor temperature is below 15 ° F (-9°C)

•

for 90 seconds following the start up of the compressor

•

during "test" mode

TURN OFF electrical power to the unit prior to unit
maintenance.

_WARNING

High Pressure
Switch (HI-PS)
The unit's automatic reset high pressure switch ($4) is factory-wired into the defrost board on the Ht-PS terminals.
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.
5-Strike
•

•

Lockout

Feature

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 resets 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 enters a lockout condition.
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. All timer functions
(run times) will also be reset.
If a pressure switch opens while the Y1 Out line is engaged, a 5-minute short cycle will occur after the
switch closes.

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.

•

NQ TE - 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 refrigerant lines and coils for leaks.

•

Check wiring for loose connections.

•

Check voltage at indoor and outdoor units during operation.

•

Check the amp-draw at the outdoor fan motor, compressor, and indoor blower motor. Compare readings
with values given on unit nameplate.

•

Clean or replace indoor unit filters.

•
•

Check refrigerant charge and system pressures.
Check condensate drain line for free and unobstructed
flow; clean if necessary.
Outdoor unit fan motor is prelubricated and sealed. No
further lubrication is needed.
NQ TE - If owner reports insufficient cooling, the unit
should be gauged and refrigerant charge checked.
(See Refrigerant Charging on Page 13.)

NQTE - The 30 second off cycle is not functional when
jumpering the TEST pins.
Operational

Description

The defrost control board has three operational modes:
1. Normal Mode - The demand defrost board monitors
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.
2. Defrost Mode - See table 10 for defrost mode and demand defrost operation.
3. 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.

Refer to the Engineering Handbook for optional accessories that may apply to this unit, e.g.:
•

Loss of Charge Kit

•
•

Compressor Monitor
Hail Guards

•
•

Mounting Bases
Timed Off Control

•

Stand-off Kit

•

Sound Cover

•

Low Ambient Kit

•

Monitor Kit

Page 18
504867M

06/06

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

Table 10
Defrost

Control

Board Diagnostic

Led (5-Strike)

LED 2

Condition

Possible

OFF

Power problem

1. No power (24V) to board
terminals R & C.
2. Board failure.

1. Check control transformer power (24V).
2. If power is available and LED(s) are unlit, replace board and all sensors.

Coil sensor problem

1. Coil temperature outside of
sensor range.
2. Faulty sensor wiring connections at board or poor
sensor contact on coil.
3. Sensor failure.

1. Sensor function will resume when coil temperature is between -20°F and 110°F.
2. Check sensor wiring connections at board
and sensor contact on coil.

1. Ambient temperature outside of sensor range.
2. Faulty sensor wiring connections at board or sensor.
3. Sensor failure.

1. Sensor function will resume when coil temperature is between -20°F and 110°F.
2. Check sensor wiring connections at board
and sensor.

OFF

Ambient sensor problem

Cause(s)

Solution

LED 1

Flash

Normal operation or unit operating in standby mode.

OFF

5-Strike pressure lockout
(Short test pins or reset 24V
power to board to override
lockout)

1. Restricted air flow over indoor or outdoor coil.

Flash

Low pressure switch circuit
open during Y1 demand

Flash

High pressure switch and/or
discharge temp. thermostat circuit open during Y1 demand

Alternating
Flash

5-minute delay (Jumper test
pins to override delay)

2. Improper
refrigerant
charge.
3. Improper metering device
operation.
4. Poor contact between coil
sensor and coil.
Thermostat demand for cooling or heat pump operation.
Unit operating in 5-minute
anti-short-cycle mode.

Demand

Defrost

3. Replace board and all sensors.

3. Replace board and all sensors.
(No action required.)
1. Remove blockages or restrictions. Check
outdoor fan motor for proper operation.
2. Check approach, superheat & subcooling
tern peratures.
3. Check system pressures. Repair leaks. Replace metering device.
4. Be sure sensor is properly positioned on coil
and that firm contact is established. Refer to
service manual for proper placement.
None required.

Operation

The demand defrost control board initiates a defrost cycle based on either frost detection or time.
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.
IMPORTANT." The demand defrost control board will aflow a greater accumulation of frost and will initiate fewer defrost cycles than a
time/temperature defrost system.
Time - If6 hours d 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 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 time. Once the defrost board is calibrated, it will use demand defrost logic to initiate a defrost cycle. A
demand defrost system initiates defrost when the difference between the clear coil and frosted coil temperatures exceeds the maximum
difference allowed by the control OR after 6 hours of heating mode compressor run time has been logged since the last defrost cycle.
Termination - The defrost cycle ends when the coil temperature exceeds the termination temperature or after 14 minutes of defrost
operation. If the defrost is terminated by the 14-minute timer, another defrost cycle will be initiated after 34 minutes of run time.
Test Mode - When Y1 is energized and 24V power is 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.

Page 19
SPA SERIES

Job Name

Job no.

Date

Job Location

City

State

Installer

City

State

Unit Model No,

Serial No.

Service Technician

Nameplate Voltage
Rated Load Ampacity

Compressor Amperage: 1st Stage

2nd Stage:

Maximum Fuse or Circuit Breaker
Electrical Connections Tight?
Indoor Blower RPM

Indoor Filter clean?
S.P. Drop Over Indoor (Dry)

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?

Outdoor Fan Checked?

Caps Tight?

Voltage With Compressor Operating
THERMOSTAT

OF OPERATION
Cooling Correct?

Calibrated?

Page 20
504867M

06/06

Properly Set? _

Level?

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LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806499

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