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©2007 Lennox Industries Inc.
Corp. 0721−L7
XP14
Service Literature
Revised 06−2008
XP14 SERIES UNITS
The XP14 is a high efficiency residential split−system heat
pump unit, which features a scroll compressor and
HFC−410A refrigerant. XP14 units are available in sizes
ranging from 1 1/2 through 5 tons. The series is designed
for use with an indoor unit with an expansion valve approved for HFC−410A. This manual is divided into sections
which discuss the major components, refrigerant system,
charging procedure, maintenance and operation sequence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change.
IMPORTANT
Operating pressures of this HFC−410A unit are
higher than pressures in HCFC−22 units. Always
use service equipment rated for HFC−410A.
WARNING
Warranty will be voided if covered equipment is removed from original installation site. Warranty will
not cover damage or defect resulting from:
Flood, wind, lightning, or installation and operation in a corrosive atmosphere (chlorine, fluorine,
salt, recycled waste water, urine, fertilizers, or other damaging chemicals).
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect switch(es). Unit may have multiple
power supplies.
TABLE OF CONTENTS
Specifications / Electrical Page 2. . . . . . . . . . . . .
I Unit Information Page 3. . . . . . . . . . . . . . . . . . . .
II Unit Components Page 3. . . . . . . . . . . . . . . . . .
III Refrigerant System Page 13. . . . . . . . . . . . . . . .
IV Charging Page 15. . . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery Page 20. . . . . . . . . . . . . .
VI Maintenance Page 21. . . . . . . . . . . . . . . . . . . . . .
VII Wiring Diagram Page 22. . . . . . . . . . . . . . . . . . .
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SPECIFICATIONS
General
Model No. XP14−018 XP14−024 XP14−030 XP14−036 XP14−042 XP14−048 XP14−060
Data
Nominal Tonnage 1.5
2 2.5 3 3.5 4 5
Connections
Liquid line o.d. − in. 3/8 3/8 3/8 3/8 3/8 3/8 3/8
(sweat)
Vapor line o.d. − in. 3/4
3/4 3/4 7/8 7/8 7/8 1-1/8
1
Refrigerant HFC−410A charge furnished 8 lbs.
4 oz.
8 lbs.
0 oz.
7 lbs.
2 oz.
9 lbs.
12 oz.
12 lbs.
7 oz.
12 lbs.
10 oz.
16 lbs.
0 oz.
Outdoor
Net face area
Outer coil 13.30 13.30 15.21 19.39 24.93 24.93 29.09
Coil sq. ft.
Inner coil 12.60
12.60 14.50 18.77 24.13 24.13 28.16
Tube diameter − in. 5/16 5/16 5/16 5/16 5/16 5/16 5/16
No. of rows 2 2 2 2 2 2 2
Fins per inch 22 22 22 22 22 22 22
Outdoor
Diameter − in. 18 18 18 26 26 26 26
Fan
No. of Blades 3
3 3 4 4 4 4
Motor hp 1/10 1/10 1/10 1/3 1/3 1/3 1/3
Cfm 2165 2165 2232 4090 4347 4347 4550
Rpm 1015 1015 1035 844 843 843 830
Watts 171 171 165 299 299 299 307
Shipping Data − lbs. 1 package 194 194 205 263 317 319 345
ELECTRICAL DATA
Line voltage data − 60 hz − 1ph 208/230V 208/230V 208/230V 208/230V 208/230V 208/230V 208/230V
2
Maximum overcurrent protection (amps) 20 30 30 30 40 50 60
3
Minimum circuit ampacity 11.9 17.5 17.0 19.4 24.2 29 34.8
Compressor
Rated Load Amps
8.97 13.46 13.1 14.1 17.94 21.79 26.41
p
Locked Rotor Amps
48 58 64 77 112 117 134
Power Factor
0.96 0.98 0.98 0.99 0.94 0.95 0.98
Outdoor
Full Load Amps
0.70 0.70 0.70 1.8 1.8 1.8 1.8
Fan Motor
Locked Rotor Amps
1.4
1.4 1.4 2.9 2.9 2.9 2.9
OPTIONAL ACCESSORIES − must be ordered extra
Compressor Crankcase Heater
93M04
p
Factory
Compressor Hard Start Kit
10J42
p
81J69
Compressor Low Ambient Cut−Off 45F08
Freezestat
3/8 in. tubing 93G35
5/8 in. tubing 50A93
Indoor Blower Off Delay Relay 58M81
4
Low Ambient Kit 54M89
Mild Weather Kit 33M07
Monitor Kit − Service Light 76F53
Outdoor
Thermostat 56A87
Thermostat Kit
Mounting Box 31461
Refrigerant
Line Sets
L15−41−20
L15−41−30
L15−41−40
L15−41−50
e Sets
L15−65−30 L15−65−40
L15−65−50
Field Fabricate
NOTE − Extremes of operating range are plus 10% and minus 5% of line voltage.
1
Refrigerant charge sufficient for 15 ft. length of refrigerant lines.
2
HACR type circuit breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
4
Crankcase Heater and Freezestat are recommended with Low Ambient Kit.
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I − UNIT INFORMATION
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit installation and service to protect the unit’s electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
All major components (indoor blower and coil) must be
matched according to Lennox recommendations for the
compressor to be covered under warranty. Refer to the Engineering Handbook for approved system matchups. A
misapplied system will cause erratic operation and can result in early compressor failure.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox’ Engineering Handbook.
II − UNIT COMPONENTS
Unit components are illustrated in figure 1.
XP14 UNIT COMPONENTS
FIGURE 1
OUTDOOR FAN
COMPRESSOR
HIGH PRESSURE
SWITCH
REVERSING
VALV E
FILTER
DRIER
CONTROL
BOX
EXPANSION
VALV E
VAPOR LINE
SERVICE
VALV E
LIQUID LINE
SERVICE
VALV E
A − Control Box (Figure 2)
XP14 units are not equipped with a 24V transformer. All 24
VAC controls are powered by the indoor unit. Refer to wiring diagram.
FIGURE 2
DUAL CAPACITOR
(C12)
COMPRESSOR
CONTACTOR
(K1)
SINGLE PHASE UNIT CONTROL BOX
GROUNDING
LUG
DEFROST
CONTROL
(A108)
Electrical openings are provided under the control box cover. Field thermostat wiring is made to a 24V terminal strip
located on the defrost control board located in the control
box. See figure 2.
24V THERMOSTAT TERMINAL STRIP
FIGURE 3
W1 C L R O Y1
*Y2
*not used
1 − Compressor Contactor K1
The compressor is energized by a contactor located in the
control box. See figure 2. Single−pole contactors are used
in all XP14 series units. K1 is energized through the defrost control by the indoor thermostat terminal Y1 (24V)
when thermostat demand is present.
DANGER
Electric Shock Hazard.
May cause injury or death.
Line voltage is present at all components when unit is not in operation on
units with single pole contactors.
Disconnect all remote electrical power
supplies before opening unit panel.
Unit may have multiple power supplies.
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2 − Dual Capacitor C12
The compressor and fan in XP14 series units use permanent
split capacitor motors. The capacitor is located inside the unit
control box (see figure 2). A single dual" capacitor (C12) is
used for both the fan motor and the compressor (see unit wiring diagram). The fan side and the compressor side of the capacitor have different MFD ratings. See side of capacitor for
ratings.
3 − Defrost System (CMC1)
The demand defrost control 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 components are shown in figure 4.
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 control 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.
Diagnostic LEDs
The state (Off, On, Flashing) of two LEDs on the defrost
board (DS1 [Red] and DS2 [Green]) indicate diagnostics
conditions that are described in table 2.
24V TERMINAL
STRIP
CONNECTIONS
DIAGNOSTIC
LEDS
PRESSURE
SWITCH CIRCUIT
CONNECTIONS
TEST PINS
NOTE − Component Locations Vary by Control Manufacturer.
Y2 not used on XP14
SENSOR
PLUG IN
(COIL & AM-
BIENT
SENSORS)
REVERSING
VALV E
DELAY
PINS
LOW
AMBIENT
THERMOSTAT
PINS
DEFROST
TERMINATION
PIN SETTINGS
FIGURE 4
Defrost Control Pressure Switch Connections
The unit’s automatic reset pressure switches (LO PS − S87
and HI PS − S4) are factory−wired into the defrost control on
the LO−PS and HI−PS terminals, respectively.
Low Pressure Switch (LO−PS)When the low pressure
switch trips, the defrost control will cycle off the compressor,
and the strike counter in the control will count one strike.
The low pressure switch is ignored under the following conditions:
during the defrost cycle and 90 seconds after the termina-
tion of defrost
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
High Pressure Switch (HI−PS)When the high pressure
switch trips, the defrost control will cycle off the compressor,
and the strike counter in the control will count one strike.
Defrost Control Pressure Switch Settings
High Pressure (auto reset) − trip at 590 psig; reset at 418.
Low Pressure (auto reset) − trip at 25 psig; reset at 55.
5−Strike Lockout Feature
The internal control logic of the control 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.
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 and 2 seconds. 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.
Defrost System Sensors
Sensors connect to the defrost control through a field-replaceable harness assembly that plugs into the board.
Through the sensors, the control detects outdoor ambient
and coil temperature fault conditions. As the detected temperature changes, the resistance across the sensor
changes. Figure 5 shows how the resistance varies as the
temperature changes for both type of sensors. Sensor resistance values can be checked by ohming across pins
shown in table 1.
TABLE 1
Sensor
Temperature
Range °F (°C)
Resistance values
range (ohms)
Pins/Wire
Color
Outdoor
(Ambient)
−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)
Note: Sensor resistance decreases as sensed temperature increases
(see figure5).
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 1, 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
needs to be replaced.
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Coil SensorThe coil temperature sensor (shown in figure 6) 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 defrost control 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.
Ambient and Coil Sensor
RESISTANCE (OHMS)
TEMPERATURE (ºF)
5750
7450
9275
11775
15425
19975
26200
34375
46275
62700
100
90
80
70
60
50
40
30
20
10
0
10000 30000 50000 70000 90000
85300
FIGURE 5
COIL SENSOR
−
Clip coil temperature sensor from the defrost control on the bend shown − 6th
bend up. Apply grease between bend
and sensor.
AMBIENT
SENSOR
FIGURE 6
Ambient SensorThe ambient sensor (shown in figure 6)
considers outdoor temperatures below −35°F (−37°C) or
above 120°F (48°C) as a fault. If the ambient sensor is detected as being open, shorted or out of the temperature
range of the sensor, the control will not perform demand defrost operation. The control will revert to time/temperature
defrost operation and will display the appropriate fault
code. Heating and cooling operation will be allowed in this
fault condition.
NOTE − Within a single room thermostat demand, if
5−strikes occur, the control will lockout the unit. Defrost control 24 volt power R" must be cycled OFF" or the TEST"
pins on the control must be shorted between 1 to 2 seconds
to reset the control.
Defrost Temperature Termination Shunt (Jumper)
PinsThe defrost control 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 control 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.
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NOTE − The 30 second off cycle is NOT functional when
jumpering the TEST pins.
Operational Description
The defrost control has three basic operational modes:
normal, calibration, and defrost.
Normal ModeThe demand defrost control 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.
Calibration ModeThe control is considered uncalibrated when power is applied to the control, after cool mode
operation, or if the coil temperature exceeds the termination temperature when it is in heat mode.
Calibration of the control 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. See figure 8 for calibration
mode sequence.
Defrost ModeThe following paragraphs provide a detailed description of the defrost system operation.
Detailed Defrost System Operation
Defrost CyclesThe demand defrost control initiates a
defrost cycle based on either frost detection or time.
Frost DetectionIf 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.
TimeIf 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.
ActuationWhen the reversing valve is de−energized, the
Y1 circuit is energized, and the coil temperature is below
35°F (2°C), the control logs the compressor run time. If the
control 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 control
fails to calibrate, another defrost cycle will be initiated after
45 minutes (90 minutes −1 to −4 boards) of heating mode
compressor run time. Once the defrost control is calibrated,
it initiates a demand defrost cycle 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.
NOTE − If ambient or coil fault is detected, the control will not
execute the TEST" mode.
TerminationThe 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 ModeWhen Y1 is energized and 24V power is being
applied to the control, 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.
Enter the TEST" mode by placing a shunt (jumper) across
the TEST" pins on the control 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). Control timings are reduced, the low−pressure switch is ignored
and the control 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 1 second and reapplied. Refer Defrost Control Pin Operationto flow chart (figure 7) for TEST" operation.
Note: The Y1 input must be active (ON) and the O" room
thermostat terminal into board must be inactive.
Defrost Control Diagnostics
See table 2 to determine defrost control operational conditions and to diagnose cause and solution to problems.
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If in COOLING Mode If in HEATING Mode If in DEFROST Mode
Short test pins for longer
than 1 second but less than
2 seconds
Short test pins for more than 2 seconds
Y1 Active (0" line inactive)
Test pin short REMAINS in place for more than 5 seconds Test pins short REMOVED before a
maximum of 5 seconds
Clear any short cycle lockout
and 5 strike fault lockout
function, if applicable. No
other functions will be
executed and unit will
continue in the mode it was
operating.
No further test mode
operation will be
executed until the test
short is removed and
reapplied.
The control will check for ambient
and coil faults (open or shorted).
If a fault exists
, the unit will
remain in Heat Mode and no
further test mode operation will
be executed until the test short is
removed and re applied. If
no fault exists
and ambient
temperature is below 35ºF, the
unit will go into Defrost mode.
The unit will terminate
defrost and enter Heat
Mode uncalibrated with
defrost timer set for 34
minute test. No further
test mode operation will
be executed until the test
short is removed and
reapplied.
Clear any short cycle lockout and 5 strike
fault lockout function, if applicable.
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 test short is removed and re applied.
The unit will remain in Defrost mode
until termination on time or temperature
FIGURE 7
Defrost Control Pin Operation
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Calibration Mode Sequence
Occurs after power up, after cooling operation, or if the coil temperature exceeds the termination
temperature while in Heat Mode.
DCB defaults to 34 minutes Time/Temperature Mode
Reset Compressor Runtime / Reset Three / Five Strike Counter
DEMAND MODE
Accumulate compressor runtime while coil temperature
is below 35° F (2°C). When
the accumulated compressor time exceeds 6 hours or
if the coil sensor indicates
frost is present on coil, go to
Defrost.
34 MIN. TIME/TEMP. MODE
Accumulate compressor runtime while coil temperature
is below 35° F (2°C). When
the accumulated compressor
time exceeds 34 minutes go
to Defrost.
45 MIN. TIME/TEMP. MODE
(90 MIN. −1 TO −4 BOARDS)
Accumulate compressor runtime while coil temperature is
below 35° F (2°C). When the
accumulated compressor
time exceeds 90 minutes go
to Defrost.
DEFROST
OUTDOOR FAN Off
Reversing Valve ON
W1 line ON
Monitor coil temperature
and time in defrost mode.
HOW DID DEFROST TERMINATE?
Coil temperature was
above 35°F (2°C) for 4
min. of the 14 min. de-
frost OR reached defrost
termination temp.
DCB’s 60L3901 and 46M8201
LO−PS Termination Option
selected. Defrost terminated by
pressure.
Defrosted for 14 min. with-
out the coil temp. going
above 35°F (2°C) for 4
min and coil did not reach
termination temp.
At termination of defrost the compressor
runtime counter is reset/Turn on Outdoor
FAN /Rev Valve & W1 turn off.
At Termination of Defrost
the compressor runtime
counter is reset/Turn on
Outdoor FAN/Rev valve &
W turn OFF
Attempt to Calibration−Temperature measurements are not taken
for the first few minutes of each heat demand. This is to allow coil
temperatures to stabilize. DCB has a maximum of 20 minutes of
accumulated compressor runtime in heat mode to calibrate DCB
This may involve more than one heating demand.
YES, calibration occurred
Was stable coil temp. attained
within 20 minutes?
NO, DCB reverts to 45 min.
(90 min. −1 to −4 boards)
time/temp.
FIGURE 8
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TABLE 2
Diagnostic Fault Code
DS2
Green
DS1
Red
Condition/Code Possible Cause(s) Solution
OFF OFF Power problem No power (24V) to control termi-
nals R & C or board failure.
1
Check control transformer power (24V).
2
If power is available to control 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. Control 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. Control will not
perform demand or time/temperature defrost operation. (System will still heat or
cool).
ON ON Circuit Board Failure Indicates that control has internal component failure. Cycle 24 volt power to control.
If code does not clear, replace control.
FAULT & LOCKOUT CODES (Each fault adds 1 strike to that code’s counter; 5 strikes per code = LOCKOUT)
OFF SLOW
Flash
Low Pressure Fault
1
Restricted air flow over indoor or
outdoor coil.
2
Improper refrigerant charge in
1
Remove any blockages or restrictions from
coils and/or fans. Check indoor and outdoor
fan motor for proper current draws.
OFF ON Low Pressure LOCKOUT
Improper refrigerant charge in
system.
3
Improper metering device
fan motor for proper current draws.
2
Check system charge using approach & sub-
cooling temperatures.
SLOW
Flash
OFF High Pressure Fault
installed
or incorrect operation
of metering device.
4
Incorrect or improper sensor
location or connection to s
y
s-
3
Check
system operating pressures an
d
compare to unit charging charts.
4
Make sure all pressure switches and sensors
have secure connections to s
y
stem to prevent
ON OFF High Pressure LOCKOUT
location or connection to sys
tem.
have secure connections to system to prevent
refrigerant leaks or errors in pressure and
temperature measurements.
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B − Compressor (B1)
The scroll compressors in all XP14 model units are designed for use with HFC−410A refrigerant and operation at
high pressures. Compressors are shipped from the factory
with 3MA (32MMMA) P.O.E. oil. See electrical section in
this manual for compressor specifications.
The scroll compressor design is simple, efficient and requires
few moving parts. A cutaway diagram of the scroll compressor
is shown in figure 9. The scrolls are located in the top of the
compressor can and the motor is located just below. The oil
level is immediately below the motor.
The scroll is a simple compression concept centered around
the unique spiral shape of the scroll and its inherent properties.
Figure 11 shows the basic scroll form. Two identical scrolls are
mated together forming concentric spiral shapes (figure 12).
One scroll remains stationary, while the other is allowed to "orbit" (figure 13). Note that the orbiting scroll does not rotate or
turn but merely orbits the stationary scroll.
FIGURE 9
SCROLL COMPRESSOR
DISCHARGE
SUCTION
NOTE − During operation, the head of a scroll compressor may
be hot since it is in constant contact with discharge gas.
FIGURE 10
SOUND COVER
COMPRESSOR
SOUND PAD
FIGURE 11
SCROLL FORM
FIGURE 12
STATIONARY SCROLL
ORBITING SCROLL
DISCHARGE
SUCTION
CROSS−SECTION OF SCROLLS
TIPS SEALED BY
DISCHARGE PRESSURE
DISCHARGE
PRESSURE
Page 11
Page 11
1
2
3
4
SUCTION
POCKET
SUCTION
ORBITING SCROLL
STATIONARY SCROLL
SUCTION
SUCTION
DISCHARGE
POCKET
SUCTION
INTERMEDIATE PRESSURE
GAS
CRESCENT
SHAPED
GAS POCKET
HIGH PRESSURE GAS
FLANKS SEALED
BY CENTRIFUGAL
FORCE
MOVEMENT OF ORBIT
FIGURE 13
The counterclockwise orbiting scroll draws gas into the outer
crescent shaped gas pocket created by the two scrolls (figure
13 − 1). The centrifugal action of the orbiting scroll seals off the
flanks of the scrolls (figure 13 − 2). As the orbiting motion continues, the gas is forced toward the center of the scroll and the
gas pocket becomes compressed (figure 13 − 3). When the
compressed gas reaches the center, it is discharged vertically
into a chamber and discharge port in the top of the compressor
(figure 12). The discharge pressure forcing down on the top
scroll helps seal off the upper and lower edges (tips) of the
scrolls (figure 12). During a single orbit, several pockets of gas
are compressed simultaneously providing smooth continuous
compression.
The scroll compressor is tolerant to the effects of liquid return. If
liquid enters the scrolls, the orbiting scroll is allowed to separate
from the stationary scroll. The liquid is worked toward the center of the scroll and is discharged. If the compressor is replaced, conventional Lennox cleanup practices must be used.
Due to its efficiency, the scroll compressor is capable of drawing a much deeper vacuum than reciprocating compr e ssors. Deep vacuum operation can cause internal fusite
arcing resulting in damaged internal parts and will result
in compressor failure. Never use a scroll compressor for
evacuating or pumping−down" the system. This type of
damage can be detected and will result in denial of warranty claims.
The scroll compressor is quieter than a reciprocating compressor, however, the two compressors have much different sound characteristics. The sounds made by a scroll
compressor do not affect system reliability, performance,
or indicate damage.
C − Outdoor Fan Motor (B4)
All units use single−phase PSC fan motors which require a run
capacitor. In all units, the condenser fan is controlled by
the compressor contactor.
ELECTRICAL DATA tables in this manual show specifications for condenser fans used in XP14’s.
Access to the condenser fan motor on all units is gained
by removing the four screws securing the fan assembly.
See figure 14. The grill fan assembly can be removed
from the cabinet as one piece. See figure 15. The condenser fan motor is removed from the fan guard by removing the four nuts found on top of the grill. See figure
15 if condenser fan motor replacement is necessary.
Make sure all power is disconnected before
beginning electrical service procedures.
DANGER
FIGURE 14
Remove
screws
Remove
screws
Page 12
Page 12
ALIGN FAN HUB FLUSH WITH END OF SHAFT
FIGURE 15
NUTS (4)
D − Reversing Valve L1 and Solenoid
A refrigerant reversing valve with electromechanical solenoid is used to reverse refrigerant flow during unit operation. The reversing valve requires no maintenance. It
is not repairable. If the reversing valve has failed, it must
be replaced.
E − Drier
A filter drier designed for all XP14 model units is factory
installed in the liquid line. The filter drier is designed to remove moisture and foreign matter, which can lead to compressor failure.
Moisture and / or Acid Check
Because POE oils absorb moisture, the dryness of the
system must be verified any time the refrigerant system is exposed to open air. A compressor oil sample must
be taken to determine if excessive moisture has been
introduced to the oil. Table 3 lists kits available from Lennox
to check POE oils.
If oil sample taken from a system that has been exposed to
open air does not test in the dry color range, the filter drier
MUST be replace.
To safeguard against moisture entering the system follow
the steps in section IV − sub section B − "Evacuating the
System" when replacing the drier.
IMPORTANT
Replacement filter drier MUST be approved for
HFC−410A refrigerant and POE application.
F − High (S4)/Low (S87) Pressure Switch
IMPORTANT
Pressure switch settings for HFC−410A refrigerant
will be significantly higher than units with
HCFC−22.
An auto-reset, single-pole/single-throw high pressure switch
is located in the liquid line. This switch shuts off the compressor when liquid line pressure rises above the factory setting.
The switch is normally closed and is permanently adjusted to
trip (open) at 590 +
10 psi.
An auto-reset, single-pole/single-throw low pressure
switch is located in the suction line. This switch shuts off the
compressor when suction pressure drops below the factory
setting. The switch is closed during normal operating pressure conditions and is permanently adjusted to trip (open)
at 25 +
5 psi. The switch automatically resets when suction
line pressure rises above 40 +
5 psi. Under certain conditions the low pressure switch is ignored. See Pressure
Switch Circuit in the Defrost Control description.
G − Crankecase Heater (HR1) &
Thermostat (S40)
XP14−036, −042, −048 and −060 units are equipped with a 40
watt belly band type crankcase heater. HR1 prevents liquid
from accumulating in the compressor. HR1 is controlled by
a thermostat located on the liquid line. When liquid line temperature drops below 50° F the thermostat closes energizing HR1. The thermostat will open, de−energizing HR1
once liquid line temperature reaches 70° F.
TABLE 3
KIT CONTENTS TUBE SHELF LIFE
10N46 − Refrigerant Analysis Checkmate−RT700
10N45 − Acid Test Tubes Checkmate−RT750A (three pack)
2 − 3 years @ room temperature. 3+
years refrigerated
10N44 − Moisture Test Tubes
Checkmate − RT751 Tubes (three
pack)
6 − 12 months @ room temperature. 2
years refrigerated
74N40 − Easy Oil Test Tubes
Checkmate − RT752C Tubes (three
pack)
2 − 3 years @ room temperature. 3+
years refrigerated
74N39 − Acid Test Kit Sporian One Shot − TA−1
Page 13
Page 13
III − REFRIGERANT SYSTEM
Refer to figure 16 and 17 for refrigerant flow in the heating and cooling modes. The reversing valve is energized
during cooling demand and during defrost.
FIGURE 16
XP14 COOLING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS)
OUTDOOR
COIL
EXPANSION/CHECK
VALV E
BIFLOW
FILTER / DRIER
TO
HFC−410A
DRUM
LOW
PRESSURE
HIGH
PRESSURE
COMPRESSOR
REVERSING VALVE
VAPOR
LINE
VALV E
MUFFLER
NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW
SERVICE
PORT
SUCTION
EXPANSION/CHECK
VALV E
INDOOR UNIT
OUTDOOR UNIT
LIQUID LINE
SERVICE
PORT
GAUGE MANIFOLD
INTERNAL
COMPRESSOR
LIMIT
DISTRIBUTOR
INDOOR
COIL
COIL SENSOR
FIGURE 17
XP14 HEATING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS)
OUTDOOR
COIL
EXPANSION/CHECK
VALV E
BIFLOW
FILTER / DRIER
TO
HFC−410A
DRUM
LOW
PRESSURE
HIGH
PRESSURE
COMPRESSOR
REVERSING VALVE
VAPOR
LINE
VALV E
MUFFLER
NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW
SERVICE
PORT
SUCTION
EXPANSION/CHECK
VALV E
INDOOR UNIT
OUTDOOR UNIT
LIQUID LINE
SERVICE
PORT
GAUGE MANIFOLD
INTERNAL
COMPRESSOR
LIMIT
DISTRIBUTOR
INDOOR
COIL
COIL SENSOR
Page 14
Page 14
A − Plumbing
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections). Use Lennox
L15 (sweat) series line sets as shown in table 4.
TABLE 4
Refrigerant Line Sets
Field
Connections
Recommended Line Set
Model
Liquid
Line
Vapor
Line
Liquid
Line
Vapor
Line
L15
Line Sets
−018
−024
−030
3/8 in.
(10 mm)
3/4 in
(19 mm)
3/8 in.
(10 mm)
3/4 in
(19 mm)
L15−41
15 ft. − 50 ft.
(4.6 m − 15 m)
−036
−042
−048
3/8 in.
(10 mm)
7/8 in
(22 mm)
3/8 in.
(10 mm)
7/8 in
(22 mm)
L15−65
15 ft. − 50 ft.
(4.6 m − 15 m)
−060
3/8 in.
(10 mm)
1−1/8 in.
(29 mm)
3/8 in.
(10 mm)
1−1/8 in.
(29 mm)
Field
Fabricated
B − Service Valves
Service valves (figures 18 and 19) and gauge ports are accessible from the outside of the unit. Use the service ports
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 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. Tight-
en finger tight, then an additional 1/6 turn.
To Open Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Use a service wrench with a hex−head extension to
back the stem out counterclockwise as far as it will go.
NOTE − Use a 3/16" hex head extension for 3/8" line
sizes or a 5/16" extension for large line sizes.
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 to 1/8 turn.
To Close Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Use a service wrench with a hex−head extension to turn
the stem clockwise to seat the valve. Tighten the stem
firmly.
NOTE − Use a 3/16" hex head extension for 3/8" line
sizes or a 5/16" extension for large line sizes.
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 to 1/8 turn.
Service Valve
(Valve Closed)
Schrader valve open
to line set when valve is
closed (front seated)
service
port
service
port cap
stem cap
insert hex
wrench here
(valve front seated)
to outdoor coil
to indoor coil
Service Valve
(Valve Open)
Schrader
valve
service
port
service port
cap
insert hex
wrench here
to indoor coil
to outdoor coil
stem cap
FIGURE 18
Vapor Line Ball Valve – 5 Ton Only
Vapor line service valves function the same way as the other valves, the difference is in the construction. If a valve has
failed, you must replace it. A ball valve is illustrated in figure
19.
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.
Page 15
Page 15
Ball Valve (Valve Open)
Schrader valve
service port
service port
cap
stem cap
stem
Use Adjustable Wrench
To open: rotate Stem Clockwise 90°.
To close: rotate Stem Counter-clockwise 90°.
ball
(shown open)
to outdoor coil
to indoor coil
FIGURE 19
IV − CHARGING
A − Leak Testing
After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit
for leaks.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
WARNING
Danger of explosion: Can cause
equipment damage, injury or death.
Never use oxygen to pressurize a refrigeration or air conditioning system.
Oxygen will explode on contact with
oil and could cause personal injury.
WARNING
Danger of explosion: Can cause equipment damage,
injury or death. When using a high pressure gas such
as dry nitrogen to pressurize a refrigeration or air
conditioning system, use a regulator that can control
the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).
Using an Electronic Leak Detector or Halide
1 − Connect a cylinder of HFC−410A to the center port of
the manifold gauge set.
2 − With both manifold valves closed, open the valve on the
HFC−410A cylinder (vapor only).
3 − Open the high pressure side of the manifold to allow the
HFC−410A into the line set and indoor unit. Weigh in a
trace amount of HFC−410A. [A trace amount is a maximum of 2 ounces (57 g) or 3 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.
4 − Connect a cylinder of nitrogen with a pressure regulat-
ing 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 pres-
sure hose is connected to the liquid line port; however,
connecting it 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.
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
HFC−410A mixture. Correct any leaks and recheck.
B − Evacuating the System
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.
NOTE − This evacuation process is adequate for a new
installation with clean and dry lines. If excessive moisture is present, the evacuation process may be required more than once.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of reading 50 microns to at least 10,000 microns.
1 − Connect manifold gauge set to the service valve ports :
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.
Page 16
Page 16
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). 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.
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 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.
CAUTION
Danger of Equipment Damage.
Avoid deep vacuum operation. Do not use compressors to evacuate a system.
Extremely low vacuums can cause internal arcing
and compressor failure.
Damage caused by deep vacuum operation will void
warranty.
7 − Shut off the nitrogen cylinder and remove the manifold
gauge hose from the cylinder. Open the manifold
gauge valves to release the nitrogen from the line set
and indoor unit.
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 vacuum pump and connect it to an upright cylinder of
HFC−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 HFC−410A cylinder and remove the
manifold gauge set.
C − Charging
Refrigerant Charge
This system is charged with HFC−410A refrigerant which
operates at much higher pressures than HCFC−22. The
recommended check expansion valve is approved for use
with HFC−410A. Do not replace it with a valve that is designed to be used with HCFC−22. This unit is NOT approved for use with coils that include metering orifices or
capillary tubes.
Units are factory-charged with the amount of HFC−410A refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with 15 ft.
(4.6 m) line set. For varying lengths of line set, refer to table
3 for refrigerant charge adjustment. A blank space is provided on the unit rating plate to list the actual field charge.
Check Indoor Airflow before Charging
IMPORTANT
Check airflow before charging!
NOTE − Be sure that filters and indoor and outdoor coils are
clean before testing.
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 tem-
peratures at the indoor coil blower unit,
voltage supplied to the unit,
amperage being drawn by the heat unit(s).
Then, apply the measurements taken in following formula
to determine CFM:
Amps x Volts x 3.41
CFM
=
1.08 x Temperature rise (F)
COOLING MODE INDOOR AIRFLOW CHECK
Check airflow using the Delta−T (
DT) process (figure 20).
Check indoor airflow using the step procedures as illustrated in figure 20.
Page 17
Page 17
Step 1. Determine the desired DTMeasure entering air tempera-
ture using dry bulb (A) and wet bulb (B). DT is the intersecting value
of A and B in the table (see triangle).
Step 2. Find temperature drop across coilMeasure the coil’s dry
bulb entering and leaving air temperatures (A and C). Temperature
Drop Formula: (T
Drop
) = A minus C.
Step 3. Determine if fan needs adjustmentIf the difference be-
tween the measured T
Drop
and the desired DT (T
Drop
–DT) is within
+
3º, no adjustment is needed. See examples: Assume DT = 15 and
A temp. = 72º, these C temperatures would necessitate stated actions:
Cº T
Drop
– DT = ºF ACTION
53º 19 – 15 = 4 Increase the airflow
58º 14 – 15 = −1 (within +
3º range) no change
62º 10 – 15 = −5 Decrease the airflow
Step 4. Adjust the fan speedSee indoor unit instructions to in-
crease/decrease fan speed.
Changing air flow affects all temperatures; recheck temperatures to
confirm that the temperature drop and DT are within +
3º.
DT
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
57 58 59 60 61 62 63 64 65 66 67 68 69 70
Temp.
of air
entering
indoor
coil ºF
INDOOR
COIL
DRY BULBDRY
BULB
WET
BULB
B
T
Drop
19º
A
Dry−bulb
Wet−bulb ºF
A
72º
B
64º
C
53º
air flowair flow
All temperatures are
expressed in ºF
FIGURE 20
Setup for Checking and Adding Charge
SETUP FOR CHARGING
low pressure gauge to vapor service port
high pressure gauge to liquid service port
Close manifold gauge set valves. Connect the center man-
ifold hose to an upright cylinder of HFC−410A.
CALCULATING 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:
Amount
specified
on
nameplat
e
Adjust amt. for
variation in
line set length
(table 6)
Additional charge
specified per
indoor unit match−up
(table 7)
To ta l
charge
+ + =
Page 18
Page 18
Pre−Charge Maintenance Checks
IMPORTANT
Use table 5 as a general guide when performing maintenance checks. This is not a procedure for charging the
unit (Refer to Charging / Checking Charge section). Minor variations in these pressures may be expected due to
differences in installations. Significant differences could mean that the system is not properly charged or that
a problem exists with some component in the system.
TABLE 5
Normal Operating Pressures − Liquid +
10 and Vapor +5 PSIG* (Cooling)
XP14−018 XP14−024 XP14−030 XP14−036 XP14−042 XP14−048 XP14−060
5F (5C)**
Liquid /
Vapor
Liquid /
Vapor
Liquid /
Vapor
Liquid/
Vapor
Liquid /
Vapor
Liquid /
Vapor
Liquid /
Vapor
Heating
60 (15) 346 / 139 352 / 138 338 / 137 350 / 134 373 / 139 355 / 130 351 / 117
50 (10) 323 / 117 331 / 114 334 / 112 331 / 117 363 / 117 336 / 113 333 / 105
40 (4) 306 / 98 304 / 99 312 / 93 313 / 97 348 / 97 315 / 88 316 / 88
30 (−1) 278 / 84 299 / 80 302 / 74 298 / 83 336 / 74 296 / 72 308 / 70
20 (−7) 273 / 66 283 / 66 280 / 53 284 / 66 322 / 64 286 / 64 300 / 61
Cooling
65 (18) 226 / 140 233 / 137 238 / 138 220 / 138 223 / 125 231 / 136 243 / 136
70 (21) 244 / 141 252 / 138 263 / 139 236 / 140 241 / 130 248 / 139 263 / 137
75 (24) 263 / 142 271 / 140 279 / 139 256 / 141 261 / 134 271 / 140 282 / 138
80 (27) 283 / 143 292 / 141 299 / 140 276 / 142 282 / 138 291 / 142 306 / 139
85 (29) 302 / 144 314 / 142 324 / 141 298 / 143 302 / 139 312 / 143 327 / 140
90 (32) 328 / 145 338 / 143 340 / 142 321 / 144 326 / 140 335 / 144 351 / 141
95 (35) 351 / 146 361 / 145 375 / 145 344 / 144 349 / 141 359 / 145 376 / 142
100 (38) 376 / 147 387 / 146 397 / 145 369 / 146 374 / 142 384 / 146 401 / 143
105 (41) 402 / 148 412 / 147 424 / 147 394 / 147 399 / 143 411 / 148 426 / 145
110 (38) 430 / 149 441 / 148 454 / 150 421 / 148 428 / 145 439 / 149 452 / 146
115 (45) 465 / 150 471 / 151 485 / 150 449 / 149 455 / 146 468 / 150 484 / 148
*IMPORTANTThese are most popular match−up pressures. Indoor match up, indoor air quality, and indoor
load cause pressures to vary.
**Temperature of the air entering the outside coil.
Weigh in Charge
1. Recover the refrigerant from the unit.
2. Conduct leak check; evacuate as previously outlined.
3. Weigh in the unit nameplate charge plus any charge required for line set differences from 15 feet and any extra
indoor unit match−up amount per table 7. (If weighing
facilities are not available, use the subcooling method.)
TABLE 6
Charge per Line Set Lengths
Liquid Line
Set Diameter
Oz. per 5 ft. (g per 1.5m) adjust from
15 ft. (4.6m) line set*
3/8 in. (9.5mm) 3 ounce per 5 ft. (85g per 1.5m)
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.
Subcooling Charge
Requirementsthese items are required for charging:
Manifold gauge set connected to unit.
Thermometers for measuring outdoor ambient, liquid line,
and vapor line temperatures.
When to use cooling modeWhen outdoor temperature
is 60°F (15°C) and above, use cooling mode to adjust
charge.
When to use heating modeWhen the outdoor temperature is below 60°F (15°C), use the heating mode to adjust
the charge.
Adding Charge for Indoor Match−UpTable 7 lists all the
Lennox recommended indoor unit matches along with the
charge levels for the various sizes of outdoor units.
Page 19
Page 19
TABLE 7
Adding Charge per Indoor Unit Match using Subcooling Method
Use
cooling
mode
Use
heating
mode
1 Check the airflow as illustrated in figure20 to be sure the indoor airflow is as required.
(Make any air flow adjustments before continuing with the following procedure.)
2 Measure outdoor ambient temperature; determine whether to use cooling mode or
heating mode to check charge.
3 Connect gauge set.
4 Check Liquid and Vapor line pressures. Compare pressures with Normal Operating
Pressures table 5, (Table 5 is a general guide. Expect minor pressure variations.
Significant differences may mean improper charge or other system problem.)
5 Set thermostat for heat/cool demand, depending on mode being used:
Using cooling modeWhen 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 68ºF (20ºC). When pressures have stabilized,
continue with step 6.
Using heating modeWhen 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 77ºF (25ºC). When pressures have stabilized,
continue with step 6.
6 Read the liquid line temperature; record in the LIQº space.
7 Read the liquid line pressure; then find its corresponding temperature in the temperature/
pressure chart listed on page 20 and record it in the SATº space.
8 Subtract LIQº temp. from SATº temp. to determine subcooling; record it in SCº space.
9 Compare SCº results with table below, being sure to note any additional charge for line
set and/or match−up.
10 If subcooling value is greater than shown in table, remove refrigerant; if less than shown,
add refrigerant.
11 If refrigerant is added or removed, repeat steps 5 through 10 to verify charge.
60ºF (15ºC)
SATº
LIQº –
SCº =
INDOOR HEAT
MATCH−UP PUMP
Subcool Target
Cooling Heating
(+
5ºF) (+1ºF)
*Add
charge
INDOOR HEAT
MATCH−UP PUMP
Subcool Target
Cooling Heating
(+
5ºF) (+1ºF)
*Add
charge
INDOOR HEAT
MATCH−UP PUMP
Subcool Target
Cooling Heating
(+
5ºF) (+1ºF)
*Add
charge
XP14−018 lb oz XP14−030 (cont’d) lb oz XP14−042 (cont’d) lb oz
CBX27UH−018/024 13 7 0 8 CX34−31A/B 11 6 1 6 CX34−62C, −62D 12 6 0 9
CBX32MV−018/024 15 7 0 0 CX34−38A/B 11 6 2 3 CX34−49C 12 6 0 7
XP14−024 lb oz
CX34−43B/C 15 11 2 14 CX34−60D 12 6 0 4
CH23−41 16 8 0 2
XP14−036 lb oz XP14−048 lb oz
CBX26UH−024 25 7 0 0 CBX26UH−036 26 5 0 0 CH23−68 20 9 2 9
CBX27UH−018/024 15 8 1 2 CBX26UH−037 25 4 1 9 CBX26UH−048 8 7 1 9
CBX32M−018/024 16 8 0 14 CBX27UH−036 13 6 0 3 CBX27UH−048 11 8 1 2
CBX32M−030 15 8 1 3 CBX32M−036 13 6 0 2 CBX32M−048, −060 11 8 1 2
CBX32MV−018/024 16 8 0 14 CBX32M−042 13 6 0 3 CBX32MV−048, −060 11 8 1 2
CBX32MV−024/030 15 8 1 2 CBX32MV−036 13 6 0 3 CBX32MV−068 10 7 1 12
CH33−42B 14 11 1 10 CBX32MV−048 11 8 2 5 CH33−50/60C 11 8 1 1
CH33−36A 16 8 1 0 C33−44C 13 6 0 0 CH33−62D 10 7 1 14
CH33−36C 16 8 0 4 CH33−50/60C 11 8 2 5 CH33−60D 11 8 0 0
CR33−30/36A/B/C 25 7 0 2 CH33−44B 13 6 1 7 CR33−50/60C 35 5 0 0
CX34−25A/B 16 8 0 14 CH33−48B 13 6 1 8 CR33−60D 37 6 0 0
CX34−31A/B 15 8 1 3 CR33−50/60C 25 4 1 15 CBX33−048, −060 12 8 1 2
CX34−36A/B/C 16 8 1 8 CR33−48B/C 25 5 0 9 CX34−62C, −62D 10 7 1 7
CX34−38A/B 14 11 2 2 CX34−49C 13 6 2 4 CX34−49D 11 8 0 14
XP14−030 lb oz
CX34−43B/C, −50/60C 13 6 1 8 CX34−60D 11 8 0 0
CH23−41 11 6 0 8 CX34−38A/B, −44/48C 13 6 0 0
XP14−060 lb oz
CH23−51 6 6 1 12
XP14−042 lb oz
CH23−68 12 5 0 0
CBX26UH−024 30 8 0 6 CH23−68 20 9 0 13 CBX26UH−048 12 7 1 0
CBX26UH−030 29 8 2 3 CBX26UH−042 27 6 0 0 CBX26UH−060 14 4 0 0
CBX27UH−030 11 6 2 4 CBX27UH−042 12 6 0 8 CBX27UH−060 12 5 0 0
CBX32M−030 11 6 1 6 CBX32M−048 12 6 0 7 CBX32M−048, −060 12 5 0 0
CBX32M−036 11 6 2 4 CBX32MV−048 12 6 0 8 CBX32MV−048, −060 12 5 0 0
CBX32MV−024/030 11 6 1 6 CH33−62D 12 6 0 10 CBX32MV−068 12 7 1 0
CBX32MV−036 11 6 2 4 CH33−50/60C 12 6 0 7 CH33−50/60C 12 5 0 0
C33−44C 11 6 2 3 CH33−60D 12 6 0 4 CH33−62D 12 5 0 0
CH33−36C 11 3 0 0 CR33−50/60C,−60D 26 6 0 4 CBX33−060 12 8 0 0
CH33−42B 6 6 1 12 CBX33−042,−048 12 7 0 4 CX34−62C, −62D 12 7 1 0
CR33−30/36A/B/C 30 8 0 8 CBX33−060 12 6 0 7
*Add charge = Extra match−up amount required in addition to charge indicated on Heat Pump nameplate (remember to also add any charge required for line set differ-
ences from 15 feet).
Page 20
Page 20
TABLE 8
HFC−410A Temp. (°F) − Pressure (Psig)
°F
Psig °F Psig °F Psig °F Psig
32 100.8 63 178.5 94 290.8 125 445.9
33 102.9 64 181.6 95 295.1 126 451.8
34 105.0 65 184.3 96 299.4 127 457.6
35 107.1 66 187.7 97 303.8 128 463.5
36 109.2 67 190.9 98 308.2 129 469.5
37 111.4 68 194.1 99 312.7 130 475.6
38 113.6 69 197.3 100 317.2 131 481.6
39 115.8 70 200.6 101 321.8 132 487.8
40 118.0 71 203.9 102 326.4 133 494.0
41 120.3 72 207.2 103 331.0 134 500.2
42 122.6 73 210.6 104 335.7 135 506.5
43 125.0 74 214.0 105 340.5 136 512.9
44 127.3 75 217.4 106 345.3 137 519.3
45 129.7 76 220.9 107 350.1 138 525.8
46 132.2 77 224.4 108 355.0 139 532.4
47 134.6 78 228.0 109 360.0 140 539.0
48 137.1 79 231.6 110 365.0 141 545.6
49 139.6 80 235.3 111 370.0 142 552.3
50 142.2 81 239.0 112 375.1 143 559.1
51 144.8 82 242.7 113 380.2 144 565.9
52 147.4 83 246.5 114 385.4 145 572.8
53 150.1 84 250.3 115 390.7 146 579.8
54 152.8 85 254.1 116 396.0 147 586.8
55 155.5 86 258.0 117 401.3 148 593.8
56 158.2 87 262.0 118 406.7 149 601.0
57 161.0 88 266.0 119 412.2 150 608.1
58 163.9 89 270.0 120 417.7 151 615.4
59 166.7 90 274.1 121 423.2 152 622.7
60 169.6 91 278.2 122 428.8 153 630.1
61 172.6 92 282.3 123 434.5 154 637.5
62 175.4 93 286.5 124 440.2 155 645.0
V − SERVICE AND RECOVERY
WARNING
Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as
much as possible. DO NOT remove line set caps or
service valve stub caps until you are ready to make
connections.
IMPORTANT
Use recovery machine rated for HFC−410A refrigerant.
If the XP14 system must be opened for any kind of service,
such as compressor or drier replacement, you must take
extra precautions to prevent moisture from entering the
system. The following steps will help to minimize the
amount of moisture that enters the system during recovery
of HFC−410A.
1 − Use a regulator−equipped nitrogen cylinder to break
the system vacuum. Do not exceed 5 psi. The dry nitrogen will fill the system, and will help purge any moisture.
2 − Remove the faulty component and quickly seal the sys-
tem (using tape or some other means) to prevent additional moisture from entering the system.
3 − Do not remove the tape until you are ready to install
new component. Quickly install the replacement component.
4 − Evacuate the system to remove any moisture and other
non−condensables.
The XP14 system MUST be checked for moisture any
time the sealed system is opened.
Any moisture not absorbed by the polyol ester oil can be removed by triple evacuation. Moisture that has been absorbed by the compressor oil can be removed by replacing
the drier.
IMPORTANT
Evacuation of system only will not remove moisture from oil. Drier must be replaced to eliminate
moisture from POE oil.
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VI − MAINTENANCE
In order to maintain the warranty on this equipment, the
XP14 system must be serviced annually and a record of
service maintained. The following should be checked between annual maintenance:
A − Outdoor Unit
1 − Clean and inspect the outdoor coil. The coil may be
flushed with a water hose. Ensure the power is turned
off before you clean the coil.
2 − Condenser fan motor is prelubricated and sealed. No
further lubrication is needed.
3 − Visually inspect connecting lines and coils for evidence
of oil leaks.
4 − Check wiring for loose connections.
5 − Check for correct voltage at unit (unit operating).
6 − Check amp−draw condenser fan motor.
Unit nameplate _________ Actual ____________ .
NOTE − If owner complains of insufficient cooling, the unit
should be gauged and refrigerant charge checked. Refer
to section on refrigerant charging in this instruction.
1 − Clean and inspect condenser coil. (Coil may be flushed
with a water hose after disconnecting power).
2 − Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
B − Indoor Coil
1 − Clean coil, if necessary.
2 − Check connecting lines and coils for evidence of oil
leaks.
3 − Check the condensate line and clean it if necessary.
C − Indoor Unit
1 − Clean or change filters.
2 − 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.
3 − Belt Drive Blowers − Check belt for wear and proper ten-
sion.
4 − Check all wiring for loose connections
5 − Check for correct voltage at unit (blower operating).
6 − Check amp−draw on blower motor
Unit nameplate_________ Actual ____________.
Page 22
Page 22
VII − WIRING DIAGRAM AND SEQUENCE OF OPERATION
XP14 UNIT DIAGRAM
5
1
2
3
4
6
Page 23
Page 23
XP14 OPERATING SEQUENCE
This is the sequence of operation for XP14 series units.
The sequence is outlined by numbered steps which correspond to circled numbers on the adjacent diagram.
The steps are identical for both cooling and first stage
heating demand with the exception reversing valve L1
is energized during cooling demand and de−energized
during heating demand.
NOTE− Transformer in indoor unit supplies power (24 VAC)
to the thermostat and outdoor unit controls.
COOLING:
Internal thermostat wiring energizes terminal O by cooling
mode selection, energizing the reversing valve L1.
1 − Demand initiates at Y1 in the thermostat.
2 − 24VAC energizes compressor contactor K1.
3 − K1-1 N.O. closes, energizing compressor (B1) and out-
door fan motor (B4).
END OF COOLING DEMAND:
4 − Demand is satisfied. Terminal Y1 is de-energized.
5 − Compressor contactor K1 is de-energized.
6 − K1-1 opens and compressor (B1) and outdoor fan
motor (B4) are de-energized and stop immediately.
FIRST STAGE HEAT:
Internal thermostat wiring de−energizes terminal O by heating mode selection, de−energizing the reversing valve L1.
See steps 1, 2 and 3.
End of FIRST STAGE HEAT:
See steps 4, 5 and 6.
DEFROST MODE:
When a d efrost cycle is initiated, the control energizes
the reversing valve solenoid and turns off the condenser fan. The control will also put 24VAC on the
W1" (auxiliary heat) line. The unit will stay in this
mode until either the coil sensor temperature is
above the selected termination temperature, the defrost time of 14 minutes has been completed, or the
room thermostat demand cycle has been satisfied.
(If the temperature select shunt is not installed, the
default termination temperature will be 90°F.) If the
room thermostat demand cycle terminates the
cycle, the defrost cycle will be held until the next
room thermostat demand cycle. If the coil sensor
temperature is still below the selected termination
temperature, the control will continue the defrost
cycle until the cycle is terminated in one of the methods mentioned above. If a defrost is terminated by
time and the coil temperature did not remain above
35°F (2°C) for 4 minutes the control will go to the
34−minute Time/Temperature mode.
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