Lennox XP14 User manual

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,1_2008 Lennox industries Inc.
Dallas, Texas, USA
INSTALLATION
INSTRUCTIONS
XP14 Elite ®Series Units
HEAT PUMP UNITS _]_Technical
.ELL1 Publications
505,244M Litho U.S.A.
04108
Supersedes 11/07
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
CAUTION
AIMPORTANT
AIMPORTANT
XP14 Outdoor Unit ............................ 1
Shipping and Packing List ...................... 1
Unit Dimensions and Parts Arrangement ......... 2
General Information ........................... 3
Setting the Unit ............................... 3
Removing Panels ............................. 5
Electrical ..................................... 6
Refrigerant Piping ............................. 8
Flushing Existing Line Set and Indoor Coil ........ 10
Refrigerant Metering Device .................... 12
Manifold Gauge Set ........................... 13
Service Valves ................................ 13
Leak Testing .................................. 14
Evacuation ................................... 14
Start-Up ...................................... 15
Refrigerant Charge ............................ 15
Check Indoor Airflow before Charging ............ 15
Setup for Checking and Adding Charge .......... 16
Pre-Charge Maintenance Checks ................ 16
Weigh in Charge .............................. 17
Subcooling Charge ............................ 17
Defrost System ............................... 19
Maintenance .................................. 24
User Information .............................. 24
Start-up and Performance Checklist .............. 26
The XP14 outdoor unit uses HFC-410A HFC refrigerant.
This unit must be installed with a matching indoor blower
coil and line set as outlined in the Lennox Engineering
Handbook, Elite® Series XP14 outdoor units are designed
for use in check thermal expansion valve (CTXV) systems
only and are not to be used with other refrigerant flow
control devices. An expansion valve approved for use with
HFC-410A must be ordered separately and installed prior
to operating the unit,
1 - Assembled XP14 outdoor unit
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier,
04/08
IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Page 1 505,244M IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

RUN
DEFROST
REVERSING
SUCTION LINE VALVE HIGH PRESSURE
SWITCH
TOP VIEW
LIQUID LINE
CONNECTION
C
DISCHARGE AIR t
i i
SIDE VIEW
UNIT SUPPORT
FEET _/
_ _ 1(_413)
(
(
LIQUID LINE
CONNECTION
ELECTRICAL
INLETS
VAPOR LINE
/CONNECTION
4-1/4( 4-3/4
108) (121)
f _
t
9-1/2
(2il)
8-1/4
(210)
i_
XP14-018 TO -030 BASE SECTION
FILTER DRIER/
LIQ
CONNECTIONS
PARTS ARRANGEMENT
VAPOR LINE
VAPOR VALVE AND
BAUGE PORT/SUCTION
LINE CONNECTIONS
1
A
1
B "-=
r
2(51)
I I I__._J
1 (25) SIDE VIEW
UNIT SUPPORT _
FEET\
18-7/8 @ @ ®
(429)
8-3/4
(222)
t
3-1/8
(79) _ (781)
-[
26-7/8
(683)
_2
3-3/4
(95)
_4-5/8
(117)
XP14-036 TO -060 BASE WITH
ELONGATED LEGS
Model No. A B C
xP14-018 31 (787) 27 (686) 28 (711)
xP14-024 31 (787) 27 (686) 28 (711)
xP14-030 35 (889) 27 (686) 28 (711)
xP14-036 31 (787) 35 1/2 (902) 39 1/2 (1003)
xP14-042 39 (991) 35 1/2 (902) 39 1/2 (1003)
xP14-048 39 (991) 35 1/2 (902) 39 1/2 (1003)
xP14-060 45 (1143) 35 1/2 (902) 39 1/2 (1003)
Page 2
505244M 04/08

WARNING 4. Locate the unit so prevailing winter winds will not blow
into the 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.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 shows
torque values for fasteners.
Table 1. Torque Requirements
Part Recommended Torque
Service valve cap 8 ft.- lb. 11 NM
Sheet metal screws 16 in.- lb. 2 NM
Machine screws #8 16 in.- lb. 2 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 8 ft.- lb. 11 NM
CAUTION
Outdoor units operate under a wide range of weather
conditions; therefore, several factors must be considered
when positioning the outdoor unit.
Position the unit to allow adequate airflow and servicing
clearance. Maintain a minimum clearance of 24 inches
(610 mm) between multiple units as illustrated in figure 1
for installation clearances.
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
living area or adjacent buildings.
2. Install the 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 the where
snowdrifts will likely build. 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.
NOTES:
Service clearance of 30 in, (762 mm) must be maintained on
one of the sides adjacent to the control box.
Clearance to one of the other three sides must be 36 in. (914
mm)
Clearance to one of the remaining two sides may be 12 in. (305
mm) and the final side may be 6 in. (152 mm),
A clearance of 24 in, (610 mm) must be maintained between
two units.
48 in. (1219 mm) clearance required on top of unit,
Figure 1. Installation Clearances
SLAB MOUNTING
When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance away from the building of 2
degrees or 2 inches per 5 feet (50 mm per 1500 mm) to
prevent ice build-up under the unit during a defrost cycle.
NOTE -If necessary for stability, anchor unit to slab as
described in Stabilizing Unit on Uneven Surfaces on page
4.
INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE
TOLERANCE OF 2 DEGREES (OR 2 INCHES PER 5 FEET
[50 MM PER 1.5 M]) AWAY FROM BUILDING STRUCTURE. .....1
BU,LD,NG
STRUCTURE
MOUNTING_ --7-
SLAB
-/
GROUND LEVEL
Figure 2. Slab Mounting Options
Page 3 XP14 SERIES

ELEVATING THE UNIT (SMALL-BASE UNITS)
If additional elevation is necessary, raise the unit by
extending the length of the unit support feet. This may be
done by cutting four equal true-cut lengths of Schedule
(SCH) 40, 4" (101.6mm) piping to the height required as
illustrated in figure 3,
NOTE -Keep the height of extenders short enough to
ensure a sturdy installation, If it is necessary to extend
further, consider a different type of field-fabricated
framework that is sturdy enough for greater heights.
The inside diameter of the 4" (101.6mm) piping is
approximately 0,25" (6.35mm) greater than the
pre-installed feet on the unit. Devise a shim that will take up
the space and hold the extenders onto the feet during this
procedure, Small strips of 0,125" (3.175mm) thick
adhesive foam may be used, One or two small 1"
(25,4mm) square strips should be adequate to hold the
extender in place.
Base
Leg Detail 4" (101.6mm)
SCH 40 Piping
Figure 3. Elevated Slab Mounting using Feet
Extenders (Small Base Units)
ELEVATING THE UNIT (LARGER-BASE UNITS)
Unlike the small-base units which use round feet, the
larger-base units are outfitted with elongated feet as
illustrated in figure 4. which uses a similar method for
elevating the unit height,
If additional elevation is necessary, raise the unit by
extending the length of the unit support feet, This may be
done with 2" SCH 40 female threaded adapter. The
specified coupling will fit snuggly into the recess portion of
the feet. Use additional 2" SCH40 male threaded adaptors
which can be threaded into the female threaded adaptors
to make additional adjustments to the level of the unit,
NOTE -Keep the height of extenders short enough to
ensure a sturdy instaflation, If it is necessary to extend
further, consider a different type of field-fabricated
framework that is sturdy enough for greater heights.
Base
Leg Detail 2" (50.Smm)
SCH 40
Female Threaded
Adapter
Figure 4. Elevated Slab Mounting using Feet
Extenders (Larger Base Units)
STABILIZING UNIT ON UNEVEN SURFACES
To help stabilize an outdoor unit, some installations may
require strapping the unit to the pad using brackets and
anchors commonly available in the marketplace.
TYPICAL i-L
INSTALLATION __'-_
WITH 3 TO 4 IN.
EXTENDERS
INSTALLED _ BUILDING
IMPORTANT! STRUCTURE
ALWAYS USE MOUNTING _ ---FSTABILIZER
BRACKET ON SLAB
ELEVATED
INSTALLATIONS
STABILIZER
BRACKETS
GROUND LEVEL
Figure 5. Elevated Slab Mounting using Feet
Extenders
,& IMPORTANT
Page 4
505244M 04/08

With unit positioned at installation site, remove two side
Iouvered panels to expose the unit base pan. Install the
brackets as illustrated in figure 6 using conventional
)ractices; replace the panels after installation is complete,
#101/2" LONG
SELF-DRILLING SHEET
METAL SCREWS COIL
STABILIZING BRACKET
(18 GAUGE METAL - 2"
WIDTH; HEIGHT AS
REQ'D)
#101-1/4" LONG HEX
HD SCREW &
FLATWASHER
BASE PAN
PLASTIC ANCHOR - USE IF CONCRETE
(HOLE DRILL 1/4"); NOT IF PLASTIC SLAB
(HOLE DRILL 1/8").
lDeck Top
_J _ Mounting __
STABILIZING MINIMUM 1
PERS'DE\2 L
'I _:_ 'l'
ANGLE
ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY,
2 BRACKETS PER SIDE, 2" FROM EACH CORNER.
Figure 6. Installing Stabilizer Brackets
(Slab Side Mounting)
ROOF MOUNTING
Install unit 6" (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 cannot be located away from prevailing winter winds,
construct a wind barrier sized at least the same height and
width as outdoor unit, Position barrier 24" (610 mm) from
the sides of the unit in direction of prevailing winds as
illustrated in figure 7,
prevailing winter winds
rwind barrier I
24"
inlet air ,_ _641'0 mm)
inlet al_
4_ inlet air
O inlet air
Figure 7. Rooftop Application with Wind Barrier
Remove the Iouvered panels as follows:
1, Remove two screws, allowing the panel to swing open
slightly as illustrated in figure 8,
2. Hold the panel firmly throughout this procedure.
Rotate bottom corner of panel away from hinge corner
post until lower three tabs clear the slots as illustrated
figure 8, Detail B.
3, Move panel down until lip of upper tab clears the top
slot in corner post as illustrated in figure 8, Detail A.
Position and Install Panel--Position the panel almost
parallel with the unit as illustrated in figure 9, Detail D on
page 6 with the screw side as close to the unit as possible,
Then, in a continuous motion:
• slightly rotate and guide the lip of top tab inward as
illustrated in figure 8, Details A and C; then upward into
the top slot of the hinge corner post,
• rotate panel to vertical to fully engage all tabs,
• holding the panel's hinged side firmly in place, close
the right-hand side of the panel, aligning the screw
holes,
When panel is correctly positioned and aligned, insert the
screws and tighten,
IMPORTANT! Do not allow panels to hang on unit by top tab. Tab
is for alignment and not designed to support weight of panel.
Panel shown slightly rotated to allow top tab to exit (or enter) top
slot for removing (or installing) panel.
SCREW
{OLES
LIP
Detail
A
Detail
B
iiiiiii+
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE PANEL
Figure 8. Removing/Installing Louvered Panels
(Details A, B and C)
Page 5 XP14 SERIES

MAINTAINMINIMUMPANELANGLE(ASCLOSETOPARALLELWITHTHEUNIT
ASPOSSIBLE)WHILEINSTALLINGPANEL.
HOLDDOORFIRMLYTOTHEHINGED
ANGLEMAYBETOO SIDETOMAINTAIN
EXTREME --_ FULLY_ENGAGEDTABS
PREFERREDANGLE
FORINSTALLATION
Detail D
Figure 9. Removing/Installing Louvered Panels
(Detail D)
CAUTION
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),
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,
1. Install line voltage power supply to unit from a properly
sized unit disconnect switch,
2. Ground the unit at the unit disconnect switch or to
earth ground.
3. To facilitate conduit, a hole is provided in the bottom of
the control box, Connect conduit to the control box
using a proper conduit fitting,
4. Units are approved for use only with copper
conductors. (A complete unit wiring diagram is
located inside the unit control box cover.)
LINE VOLTAGE
FIELD INSTALLED
WARNING! - ELECTRIC SHOCK HAZARD. Can cause INJU-
RY or DEATH, Unit must be grounded in accordance with
national and local codes.
Z,/iXXNOTE - For use with copper conductors only. Refer to unit
rating plate for minimum circuit ampacity and maximum over-
current protection size.
Figure 10. Outdoor Unit Typical Field Wiring
NOTE -For proper voltages, select thermostat wire
gauge per the following chart:
Table 2. Wire Run Lengths
Wire run length AWG # Insulation type
color-coded, temperature
rating 35°C minimum
less than 100' (30m) 18
more than 100' (30m) 16
5. 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 affected by sunlight, drafts or vibrations,
6. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit, See figures 11 and
12 on page 7,
NOTE - 24V, Class II circuit connections are made in the
low voltage junction box,)
,WARNING
Page 6
505244M 04/08

24Vpower
common _ L
E
1st-stage FE
_L
indoor blower
Thermostat Indoor Unit Outdoor Unit
......... ©1
1st-stage
auxiliary heat (_ I
@1
OI
®1
@comp....... GI
(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC
THERMOSTAT AND INDOOR UNIT.)
Figure 11. Outdoor Unit and Blower Unit Thermostat
Designations
Thermostat Indoor Unit Outdoor Unit
. 24V power 24V power
©c ........ 2®-..0 ........
',@ :'-:/- _ EMERGENCY
]I_) _ HEAT RELAY
(_. emergency heat i -- -- //_i OUTDOOR
THERMOSTAT
i
(_). 1st-stage 'auxiliary heat .(_ // 1st-stage
auxiliary h_t-- (_
k@"
@
@.
®
G
indoor blower
reversing valve
compressor ®
@
(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC
THERMOSTAT AND INDOOR UNIT.)
Figure 12. Outdoor Unit and Blower Unit Thermostat
Designations (with Emergency Heat Relay)
CI2
CAPAC lTOR
"34O
HRI
AIOB
DEFROST CONTROL ;01L
_MB
)IS
if--,
I_f
iv v
s_r
HI_
PRESSORE
SWITCH
Q
PRESSURE
SWITCH
©
AI08 I--
KI
Ig
Q-
@
RT21 RTI5
DEFROST AMBIENT
COIL SENSOR
SENSOR
FOR _ WITH COPPER CONDUCTORS
ORLY.RERERTO UNIT RATIN6
PLATE FOR ¥INIMII_I CII_IIT
A_PACITY ANOgAXINUff OVER-
CtI_NT RqOTECTION SIZE
,6_ REFER TO COMPRESSORIN U_IT
OR DEATH.UNIT MI_T B_ OR(X/NOEDIN
_ITH NATION_. AND LOCALCO_S,
m_ SENSOR,OmOOOR_ve (_m_L)
r- -- --
I F----
I
I
I
II
.IJ
,r=, C831 lily
x_2av
_3)"1
._&,?_-- [.--.__
®-I----
-@-I----
-@-I----
OUT
OPS
f2 OUT
;0M
fl OUT
-PS
KI
C_SSOR
CONTACTOR
LI
REVERSING
VAL_
®A2 SIGNATURE
81MZ8
T_ISTED
D
-Jl'
-- --t-- d
--J
Figure 13. Typical XP14 Wiring
Page 7 XP14 SERIES

A IMPORTANT
If the XP14 unit is being installed with a new indoor coil and
line set, the plumbing 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 XP14 system, refer
to the following section that includes flushing procedures.
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,
non-flare) series line sets as shown in table 3 or use
field-fabricated refrigerant lines. Refer to Refrigerant
Piping Guide (Corp. 9351-L9) for proper size, type, and
application of field-fabricated lines. Valve sizes are also
listed in table 3.
REFRIGERANT LINE CONNECTIONS - XP14
OUTDOOR UNIT MATCHED WITH NEW INDOOR
COIL AND LINE SET
If replacing an existing coil equipped with a liquid line
functioning as a metering orifice, replace the liquid line
prior to installing the XP14 unit. Line sets are described in
table 3.
Model
Table 3. Refrigerant Line Sets
Valve Field
Connections
Liquid Vapor
Line Line
-018 3/8 in. 3/4 in
-024 (10 mm) (19 mm)
-030
-036 3/8 in. 7/8 in
-042 (10 mm) (22 mm)
-048
3/8 in, 1-1/8 in.
-060 (10 ram) (29 ram)
Recommended Line Set
Liquid Vapor L15
Line Line Line Sets
3/8 in. 3/4 in L15-41
(10 (19 mm) 15 ft, - 50 ft.
mm) (4.6 m - 15 m)
3/8 in. L15-65
(10 7/8 in
mm) (22 mm) 15 ft, - 50 ft.
(4.6 m - 15 m)
3/8 in, 1-1/8 in. Field
(10 (29 mm) Fabricated
mm)
NOTE -When installing refrigerant lines, refer to Lennox
Refrigerant Piping Guide (Corp. 9351-L9) or Lennox
Technical Support Department Product Appficafions
Group for assistance. In addition, be sure to consider the
following points:
•Select line set diameters from table 3 to ensure that oil
returns to the compressor.
• Unitsaredesignedforlinesetsofupto50feet(15m);
for longer line sets, consult piping guidelines.
• Size vertical vapor riser to maintain minimum velocity
at minimum capacity.
INSTALLING REFRIGERANT LINE
Pay close attention to line set isolation during installation of
any heat pump or a/c system. When properly isolated from
building structures (walls, ceilings, floors), the refrigerant
lines will not create unnecessary vibration and subsequent
noises. Also, consider the following when placing and
installing a high-efficiency outdoor unit:
1, Placement--Some localities are adopting sound
ordinances based on the unit's noise level observed
from the adjacent property, not from the installation
property, 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. Figure 14 shows how to place
the outdoor unit and line set,
Install unit _ \_\
away from //
windows _
zz'.11111II I III I IIIrb---.
will reduce line set vibration.
Figure 14. Outside Unit Placement
2. Line Set Isolation--The following illustrations
demonstrate procedures which ensure proper
refrigerant line set isolation.
• Figure 15 on page 9 shows how to install line sets
on horizontal runs.
• Figure 16 on page 9 shows how to install line sets
on vertical runs.
• Figure 17 on page 10 shows how to make a
transition from horizontal to vertical
Page 8
505244M 04/08

To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.
STRAPPING MATERIAL
(Around vapor line only)
8 feet
FLOOR JOIST OR
ROOF RAFTER
r\
//
WIRE TIE
(Around vapor line only)
TAPE OR
8 feet WIRE TIE Strap the vapor line to the joist or
rafter at 8 ft. intervals then strap
the liquid line to the vapor line.
METAL FLOOR JOIST OR
SLEEVE ROOF RAFTER
TAPE OR WIRE TIE
Figure 15. Refrigerant Line Sets: Installing Horizontal Runs
NOTE -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 LIQUID LINE
IMPORTANT!
Refrigerant
lines must
not contact
structure.
VAPOR LINE WRAPPED
[_ CAULK
PVC PiPE FIBERGLASS
iNSULATiON
-_. WIRE TIE
INSIDE WALL
- STRAP
SLEEVE
WIRE TIE
_" .---------WOOD BLOCK
.___---- WIRE TIE
STRAP
SLEEVE
Figure 16. Refrigerant Line Sets: Installing Vertical Runs (New Construction Shown)
Page 9 XP14 SERIES

ANCHORED
HEAVY NYLON
WIRE TIE
AUTOMOTIVE
MUFFLER-TYPE
HANGER
WALL
STUD WALL
STUD
Strap Liquid
Line To Va- Strap Liquid Line
por Line To Vapor Line
UID LINE LIQUID LINE
METAL VAPOR LINE - WRAPPED METAL VAPOR LINE - WRAPPED
SLEEVE IN ARMAFLEX SLEEVE IN ARMAFLEX
Figure 17. Refrigerant Line Sets: Transition from Vertical to Horizontal
I
WARNING NOTE -The tube end must stay bottomed in the fitting
during final assembly to ensure proper seating,
sealing and rigidity,
5. Install a field-provided check expansion valve
(approved for use with HFC-410A refrigerant) in the
liquid line at the indoor coil,
BRAZING CONNECTION PROCEDURE
1, Cut ends of the refrigerant lines square (free from
nicks or dents), Debur the ends. The pipe must remain
round; do not pinch end of the line.
2, Flow dry nitrogen through the refrigerant piping while
making line set connections; this prevents carbon
deposits (oxidation) buildup on the inside of the joints
being brazed. Such buildup may restrict refrigerant
flow through screens and metering devices, To do this:
Flow regulated nitrogen (at 1 to 2 psig) through the
refrigeration gauge set into the Schrader port
connection on the vapor service valve and out of
the Schrader port connection on the liquid service
valve. (Metering device (CTXV and RFC) will
allow low pressure nitrogen to flow through the
system,)
While nitrogen is flowing, braze refrigerant line set
to the indoor and outdoor units, IMPORTANT" The
flow of nitrogen must have an escape path
other than through the joint to be brazed.
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) which are rated for use with HFC-410A
refrigerant,
4, Wrap a wet cloth around the valve body and the copper
tube stub to protect it from heat damage during
brazing. Wrap another wet cloth underneath the valve
body to protect the base paint,
XkIMPORTANT
kWARNING
Page 10
505244M 04/08

CAUTION
EQUIPMENT REQUIRED FOR FLUSHING LINE SET
The following equipment is required to flush the existing
line set and indoor coil:
• two clean HCFC-22 recovery cylinders
• oilless recovery machine with a pump down feature
• gauge set for HCFC-22 refrigerant
• gauge set for HFC-410A refrigerant (see Manifold
Gauge Set section on page 13),
FLUSHING PROCEDURE
1, Remove existing HCFC-22 refrigerant using the
following, applicable procedure as illustrated in figure
18:
If the existing outdoor unit is not equipped with
shut-off valves, or if the unit is not operational
AND you plan to use the existing HCFC-22
refrigerant to flush the system -
• Disconnect all power to the existing outdoor unit,
• Connect to the existing unit, a clean recovery
cylinder and the recovery machine according to
the instructions provided with the recovery
machine,
• Remove all HCFC-22 refrigerant from the existing
system. Check 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
HCFC-22 refrigerant to flush the system -
,
,
,
• Start the existing HCFC-22 system in the cooling
mode and close the liquid line valve.
• Pump all of the existing HCFC-22 refrigerant back
into the outdoor unit. (It may be necessary to
bypass the low pressure switches to ensure
complete refrigerant evacuation.)
• When the low side system pressures reach 0 psig,
close the vapor line valve.
• Disconnect all power to the existing outdoor unit.
Check 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
HFC-410A unit and follow the Brazing Connection
Procedure provided on page 10 to make line set
connections. DO NOT install HFC-410A
check/expansion valve 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.
Remove the existing HCFC-22 refrigerant flow control
orifice or check expansion valve before continuing with
flushing procedures. HCFC-22 flow control devices
(fixed orifice/check expansion valve) are not approved
for use with HFC-410A refrigerant and may prevent
proper flushing. Use a field-provided fitting to
reconnect the lines,
IMPORTANT
Inverted HCFC-22 Cylinder
(Contains clean HCFC-22 to be
used for flushing)
RECOVERY CYLINDER
EXISTING VAPOR LINE VAPOR LINE SERVICE VALVE
EXISTING LIQUID LINE LIQUID LINE
SERVICE VALVE
Tank ReturnInlet
, Discharge
RECOVERY MACHINE
Low High
Pressure Pressure
Opened ! ! Closed
NOTE - The inverted HCFC-22 cylinder must
contain at least the same amount of refrigerant
as was recovered from the existing system.
Figure 18. Flushing Connections
Page 11 XP14 SERIES

5. Remove the pressure tap valve cores from the XP14
unit's service valves. Connect an HCFC-22 cylinder
with clean refrigerant to the vapor service valve,
Connect the HCFC-22 gauge set to the liquid line valve
and connect a recovery machine with an empty
recovery tank to the gauge set.
6. 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.
7. Invert the cylinder of clean HCFC-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,
8. After all of the liquid refrigerant has been recovered,
switch the recovery machine to vapor recovery so that
all of the HCFC-22 vapor is recovered. Allow the
recovery machine to pull a vacuum on the system,
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. After each
system flush, allow the recovery machine to pull a
vacuum on the system at the end of the
procedure.
9. Close the valve on the inverted HCFC-22 drum and
the gauge set valves. Pump the remaining refrigerant
out of the recovery machine and turn the machine off.
10. Use dry nitrogen to break the vacuum on the
refrigerant lines and indoor coil before removing the
recovery machine, gauges and HCFC-22 refrigerant
drum. Reinstall pressure tap valve cores into XP14
unit's service valves.
11. Install check expansion valve (approved for use with
HFC-410A refrigerant) in the liquid line at the indoor
coil.
XP 14 units may be used in check thermal expansion valve
(CTXV) systems only. See indoor coil installation
instructions and the Lennox engineering handbook for
approved HFC-410A valve match-ups and application
information,
NOTE -HFC-410A systems will not operate properly with
an HCFC-22 valve,
Check thermal expansion valves equipped with fittings are
available from Lennox, Refer to the Engineering
Handbook for applicable expansion valves for use with
specific match-ups, See table 4 for applicable indoor check
expansion valve kits.
Table 4. Indoor Check Expansion Valve Kits
MODEL Kit Number
XP14-018, -024, -030 49L24
XP14-036, -042 49L25
XP14-048, -060 91M02
PATcHTWo(UncaSedpECEpLATECoil Shown) _ - _
(uncased coil ORIFICE I EXPANSION VALVE
only) HOUSING I (see no_e)
TUBES X
ACCESS FITTIN/
(no valve core) SENSING BULB
1 pi'EsNuISalN°(n re qu' red )
On smaller lines, 1/2" & smaller
bo,bmaybe•
mounted on top
_ _g
Do not mount bulb
on bo{tom of line 5/8" & larger suction line
NOTE - If necessary, remove
HCFC-22 flow control device
(fixed orifice/check expansion
valve) from existing line set before
installing HFC-410A approved ex-
pansion valve and o-ring.
Figure 19. Metering Device Installation
IMPORTANT
If you install a check thermal expansion valve with an
indoor coil that includes a fixed orifice, remove the orifice
before the check expansion valve is installed. See figure
19 for installation of the check expansion valve.
Page 12
505244M 04/08

CHECK
EXPANSIONVAL_
LOW HUGH
PRESSUREPRESSURE
DISTRIBUTOR
BIFLOW
FILTE
DRIER OUTDOOR
COIL
COMPRESSOR
v
OUTDOOR UNiT
REVERSING VALVE
VAPOR
/APOR
SERVICE .INE
POR_ /ALVE
CHECK EXPANSION VALVE --
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.
NOTE - ARROWS INDICATE
DIRECTION OF REFRIGERANT FLOW
INDOOR I
VAPOR
SERVICE
PORT
:ll--
ilhd I I
INDOOR
COIL
Figure 20. XP14 Cooling Cycle (Showing Gauge Manifold Connections)
Manifold gauge sets used with systems charged with
HFC-410A refrigerant must be capable of handling the
higher system operating pressures. The gauges should be
rated for use with pressures of 0 - 800 on the high side and
a low side of 30" vacuum to 250 psi with dampened speed
to 500 psi. Gauge hoses must be rated for use at up to 800
psi of pressure with a 4000 psi burst rating.
The service valves 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 Access Schrader Port:
1. Remove service port cap with an adjustable wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap.
Tighten finger tight, then torque per table 1 on page 3.
To Open Front-Seated Service Valves:
1. Remove stem cap with an adjustable wrench.
2. Use a service wrench with a hex-head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to back the stem out counterclockwise as
far as it will go.
3. Replace the stem cap. Tighten finger tight, then torque
per table 1 on page 3.
To Close Front-Seated Service Valves:
1. Remove the stem cap with an adjustable wrench.
2. Use a service wrench with a hex-head extension
(3/16" for liquidqine valve sizes; 5/16" for vapor-line
valve sizes) to turn the stem clockwise to seat the
valve. Tighten it firmly.
3. Replace the stem cap. Tighten finger tight, then torque
per table 1 on page 3.
STEM INSERT HEX
SCHRADER CAP
VALVE ]OPEN TO
LINE SET WHEN
VALVE IS CLOSED ",LLJ
]FRONT SEATED)] _
OUT-
DOOR
COl
SERVICE
PORT CAP _VALVE FRONT-SEATED)
Valve in closed position
WRENCH HERE,
/
Valve in open position
Figure 21. Front-Seated Liquid Line Valve
Vapor Line Ball Valve
Ball-type service valves as illustrated in figure 22 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.
STEM
CAP
USE ADJUSTABLE WRENC
TO OPEN: ROTATE STEM _STEM
COUNTER-CLOCKWISE 90 °.
TO CLOSE: ROTATE STEM
CLOCKWISE 90° .
TO
OUTDOOR
COIL
BALL (SHOWN
SERVICE PORT
(_SCHRADER VALVE
TO
INDOO
R COIL SERVICE
PORT CAP
Figure 22. Bali-Type Vapor Valve (Valve Closed)
Page 13 XP14 SERIES

After the line set has been connected to the indoor and
outdoor units, check the line set connections and indoor
unit for leaks. WARNING
, WARNING [
WARNING I
USING AN ELECTRONIC LEAK DETECTOR
IMPORTANT
1. Connect a cylinder of HFC-410A to the center port of
the manifold gauge set,
2. With both manifold valves closed, connect the cylinder
of HFC-410A refrigerant, Open the valve on the
HFC-410A cylinder (vapor only),
3. Open the high pressure side of the manifold to allow
HFC-410A into the line set and indoor unit, Weigh in
a trace amount of HFC-410A. [A trace amount is a
maximum of 2ounces (57 g) refrigerant 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 HFC-410A cylinder.
4. Connect a cylinder of dry 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
.
7,
pressure 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,)
Adjust dry nitrogen pressure to 150 psig (1034 kPa),
Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit.
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 dry nitrogen and
HFC-410A mixture. Correct any leaks and recheck.
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.
IMPORTANT
1. Connect 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,
4. Open both manifold valves; start thevacuum 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 dry nitrogen
cylinder with pressure regulator set to 150 psig (1034
kPa) and purge the hose. Open the manifold gauge
valves to break the vacuum in the line set and indoor
unit, Close the manifold gauge valves.
Page 14
505244M 04/08

Xk WARNING
7. Shut off the dry nitrogen cylinder and remove the
manifold gauge hose from the cylinder. Open the
manifold gauge valves to release the dry nitrogen from
the line set and indoor unit,
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,
power company has been consulted and the voltage
condition has been corrected.
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.
A IMPORTANT
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.
IMPORTANT
1. Rotate fan to check for frozen bearings or binding.
2. Inspect all factory- and field-installed wiring for loose
connections,
NOTE -After the system has been evacuated and before
completing all the remaining start-up steps, this is the ideal
time to adjust the amount of refrigerant made necessary by
line set length difference and by the specific indoor unit
match-up, Skip to the paragraph "Setup for Checking and
Adding Charge" on page 16 to setup for charging and for
determining if charge is needed; adjust the charge
accordingly
3. Open the liquid line and vapor line service valves
(counterclockwise) 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
AIMPORTANT
NOTE -Be sure that filters and indoor and outdoor coils are
clean before testing,
COOLING MODE INDOOR AIRFLOW CHECK
Check airflow using the Delta-T (DT) process (figure 23).
HEATING MODE INDOOR AIRFLOW CHECK
Blower airflow (CFM) may be calculated by energizing
electric heat and measuring:
• temperature rise between the return air and supply air
temperatures at the indoor coil blower unit,
• 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 xVoltsx3.41
CFM = 1.08x Temperature rise (F)
Check indoor airflow using the step procedures as
illustrated in figure 23.
Page 15 XP14 SERIES

Temp. ] DT
ofair 180 24 24 24 23 23 22 22 22 20 19 18 17 16 15
entering._178 23 23 23 22 22 21 21 20 19 18 17 16 15 14
indoor _ I _
coilOF _lru 22 22 22 21 21 20 19 19 18 17 16 15 14 13
I_'174 21 21 21 20 19 19 18 17 16 16 15 14 13 12
_[72 20 20 19 18 17 17 16Z_15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
Wet-bulb°F 57 58 59 60 61 62 63 64 65 66 67 68 69 70 ]
m
9o DRY
BULB
All temperatures are INDOOR WET
expressed in °F COIL BULB
_6
Step 1. Determine the desired DT--Measure 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 ceil--Measure the coil's dry
bulb entering and leaving air temperatures (A and C). Temperature
Drop Formula: (TDrop) = A minus C.
Step 3. Determine if fan needs adjustment--If the difference be-
tween the measured TDrop and the desired DT (TDropiDT) is within
+3°, no adjustment is needed. See examples: Assume DT = 15 and A
temp. = 72°, these C temperatures would necessitate stated actions:
C° TDrop- DT = °F ACTION
53°19 15 = 4 Increase the airflow
58° 14 15 = -1 (within +3° range) no change
62°10 15 = -5 Decrease the airflow
Step 4. Adjust the fan speed--See 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 +3°.
Figure 23. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart
SETUP FOR CHARGING
Connect the manifold gauge set to the unit's service ports
(see figure 20):
• low pressure gauge to vapor service port
• high pressure gauge to liquid service port
Close manifold gauge set valves. Connect the center
manifold 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 Adjust amt. for Additional charge
specified variation in specified per
on line set length indoor unit match-up Total
nameplate (table 6) (table 7) charge
+ + =
Page 16
505244M 04/08

IMPORTANT
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
Liquid/Liquid/Liquid/Liquid/ Liquid/Liquid/Liquid/
°F (°C)** Vapor Vapor Vapor Vapor Vapor Vapor 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
*IMPORTANT--These 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.
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 Oz. per 5 ft. (g per 1.5m)adjust from
Set Diameter 15 ft. (4.6m) lineset*
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.
Requirements--these 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 mode--When outdoor
temperature is 60°F (15°C) and above, use cooling mode
to adjust charge,
When to use heating mode--When the outdoor
temperature is below 60°F (15°C), use the heating mode to
adjust the charge,
Adding Charge for Indoor Match-Up--Table 7 lists all
the Lennox recommended indoor unit matches along with
the charge levels for the various sizes of outdoor units,
Page 17 XP14 SERIES

Use
!___ ___ cooling
mode
_60°F (15°C) -
+use
_I heating
mode
Table 7. Adding Charge per Indoor Unit Match using Subcooling Method
1 Check the airflow as illustrated in figure 23 on page 16 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 mode--When the outdoor ambient temperature is 60°F (15°C) and above.
Target subcooling values in table below are based on 70 to 80°F (21-27°C) indoor return
air temperature; if necessary, operate heating to reach that temperature range; then set
thermostat to cooling mode setpoint to 68°F (20°C). When pressures have stabilized,
continue with step 6.
Using heating mode--When the outdoor ambient temperature is below 60°F (15°C).
Target subcooling values in table below are based on 65-75°F (18-24°C) indoor return air
temperature; if necessary, operate cooling to reach that temperature range; then set
thermostat to heating mode setpoint to 77°F (25°C). When pressures have stabilized,
continue with step 6.
9 Compare SC° 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
Subcool Target
INDOOR HEAT Cooling Heating
MATCH-UP:,..O.,.PUMPI +°F1I I°F1
CBX27UH-018/024 13 7
CBX32MV-018/024 15 7
*Add
charge
• +
o 8
o o
Subcool Target
INDOOR HEAT Cooling Heating
MATCH-UPPO+
CX34-31A/B 11 6
CX34-38A/B 11 6
CX34-43B/C 15 11
I I ll'3,+"I I I llm=.)
CH23-41 16 8 0 2
CBX26UH-024 25 7 0 0 CBX26UH-036 26 5
CBX27UH-018/024 15 8 1 2 CBX26UH-037 25 4
CBX32M-018/024 16 8 0 14 CBX27UH-036 13 6
CBX32M-030 15 8 1 3 CBX32M-036 13 6
CBX32MV-018/024 16 8 0 14 CBX32M-042 13 6
CBX32MV-024/030 15 8 1 2 CBX32MV-036 13 6
CH33-42B 14 11 1 10 CBX32MV-048 11 8
CH33-36A 16 8 1 0 C33-44C 13 6
CH33-36C 16 8 0 4 CH33-50/60C 11 8
CR33-30/36A/B/C 25 7 0 2 CH33-44B 13 6
CX34-25A/B 16 8 0 14 CH33-48B 13 6
CX34-31A/B 15 8 1 3 CR33-50/60C 25 4
CX34-36A/B/C 16 8 1 8 CR33-48B/C 25 5
CX34-38A/B 14 11 2 2 CX34-49C 13 6
CX34-43B/C, -50/60C 13 6
CH23-41 11 6 0 8 CX34-38A/B, -44/48C 13 6
0H23-51 6 6 112 _II
CBX26UH-024 30 8 0 6 CH23-68 20 9
CBX26UH-030 29 8 2 3 CBX26UH-042 27 6
CBX27UH-030 11 6 2 4 CBX27UH-042 12 6
CBX32M-030 11 6 1 6 CBX32M-048 12 6
CBX32M-036 11 6 2 4 CBX32MV-048 12 6
CBX32MV-024/030 11 6 1 6 CH33-62D 12 6
CBX32MV-036 11 6 2 4 CH33-50/60C 12 6
C33-44C 11 6 2 3 CH33-60D 12 6
CH33-36C 11 3 0 0 CR33-50/60C,-60D 26 6
CH33-42B 6 6 1 12 CBX33-042,-048 12 7
CR33-30/36A/B/C 30 8 0 8 CBX33-060 12 6
*Add charge =Extra match-up amount required in addition to charge indicated on Heat Pump nameplate
ences from 15 feet).
through 10 to verify charge.
Subcool Target
*Add INDOOR HEAT Cooling Heating *Add
charge MATCH-UP PUMP I±5°F1 Ill°F1 charge
1 6 CX34-62C, -62D 12 6 0 9
2 3 CX34-49C 12 6 0 7
2 14 CX34-60D 12 6 0 4
0 0 CH23-68 20 9 2 9
1 9 CBX26UH-048 8 7 1 9
0 3 CBX27UH-048 11 8 1 2
0 2 CBX32M-048,-060 11 8 1 2
0 3 CBX32MV-048, -060 11 8 1 2
0 3 CBX32MV-068 10 7 1 12
2 5 CH33-50/60C 11 8 1 1
0 0 CH33-62D 10 7 1 14
2 5 CH33-60D 11 8 0 0
1 7 CR33-50/60C 35 5 0 0
1 8 CR33-60D 37 6 0 0
1 15 CBX33-048, -060 12 8 1 2
0 9 CX34-62C, -62D 10 7 1 7
2 4 CX34-49D 11 8 0 14
1 8 CX34-60D 11 8 0 0
I ll_ [,+Immmm
CH23-68 12 5 0 0
0 13 CBX26UH-048 12 7 1 0
0 0 CBX26UH-060 14 4 0 0
0 8 CBX27UH-060 12 5 0 0
0 7 CBX32M-048,-060 12 5 0 0
0 8 CBX32MV-048, -060 12 5 0 0
0 10 CBX32MV-068 12 7 1 0
0 7 CH33-50/60C 12 5 0 0
0 4 CH33-62D 12 5 0 0
0 4 CBX33-060 12 8 0 0
0 4 CX34-62C,-62D 12 7 1 0
0 7
(remember to also add any charge required for line set differ-
Page 18
505244M 04/08

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
DEFROST SYSTEM DESCRIPTION
The demand defrost controller measures differential
temperatures to detect when the system is performing
poorly because of ice build-up on the outdoor coil, The
controller self-calibrates when the defrost system starts
and after each system defrost cycle. The defrost control
board components are shown in figure 24,
The control monitors ambient temperature, outdoor coil
temperature, and total run time to determine when a
defrost cycle is required. The coil temperature probe is
designed with a spring clip to allow mounting to the outside
coil tubing. The location of the coil sensor is important for
proper defrost operation.
NOTE -The demand defrost board accurately measures
the performance of the system as frost accumulates on the
outdoor coil. This typically will translate into longer running
time between defrost cycles as more frost accumulates on
the outdoor coil before the board initiates defrost cycles.
SERVICE LIGHT OPERATION
The thermostat is not included with the unit and must be
purchased separately. Some outdoor thermostats
incorporate isolating contacts and an emergency heat
function (which includes an amber indicating light), The
service light thermostat will enable the emergency heat
light function on the room thermostat,
EMERGENCY HEAT (AMBER LIGHT)
An emergency heat function is designed into some room
thermostats. This feature is applicable when isolation of
the outdoor unit is required, or when auxiliary electric heat
is staged by outdoor thermostats. When the room
thermostat is 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 DRIER
The unit is equipped with a large-capacity biflow filter drier
which keeps the system clean and dry, If replacement is
necessary, order another of the same design and capacity.
The replacement filter drier must be suitable for use with
HFC-410A refrigerant,
DEFROST CONTROL BOARD
Figure 24 provides a basic illustration of the layout of the
defrost control board. Table 9 provides information
concerning pin-out and jumper configurations,
Note -Component Locations Vary by Board Manufacturer.
TEST PINS
DEFROST
TERMINATION -
PIN SETTINGS
SENSOR PLUG IN
(COIL, AMBIENT, -
& DISCHARGE
SENSORS)
DELAY
PINS
REVERSING
VALVE
PRESSURE
SWITCH
CIRCUIT _
CONNECTIONS
IT'_pI
0
= I]
0 o#t
o
.o-PS
COMMON
©
_OFAR
®
Z @c
@L
o
Iololololo1_1olol 0
TSTPS Df C _ 0 YI Y2
LOW
AMBIENT
THERMOSTAT
PINS
_ DIAGNOSTIC
LEDS
24V TERMINAL
STRIP
CONNECTIONS
Figure 24. Defrost Control Board
Page 19 XP14 SERIES

Table 9. Defrost Control Board Description
ID Description
O Out 24 VAC output connection for reversing valve
LO-PS Connection for low-pressure switch
Y2 24 VAC output for second stage compressor solenoid
Y1 24 VAC common output, switched for enabling compressor
contactor
HI-PS Connection for high-pressure switch
P1 Seven position square pin header. P1 provides selection of
the defrost terminate temperature based on the position of
selection shunt, as well as selection pins for enabling the
field test mode.
P2 The following connections are provided in the seven posi-
tion P2 screw terminal block:
Wl 24 VAC thermostat output for auxiliary heat op-
eration
C 24 VAC system common
L Service light thermostat connection
R 24 VAC system power input
Y2 24 VAC thermostat input for second stage com-
pressor operation
O 24 VAC thermostat input for reversing valve op-
eration
Y1 24 VAC thermostat input for first stage compres-
sor operation
P3 Five position square pin header. P3 provides selection of
the Y2 compressor lock-in temperature. Note: This is ap-
plicable for two stage compressor operations only.
P4 Six position square pin header. P4 provides connections for
the temperature sensors:
COIL (P4-5) Ground connection for outdoor coil tem-
perature sensor.
(P4-6) Connection for outdoor coil temperature
sensor
AMB (P4-3) Ground connection for outdoor ambient
temperature sensor.
(P4-4) Connection for outdoor ambient tempera-
ture sensor.
DIS (P4-1) Ground connection for discharge temper-
ature sensor.
(P4-2) Connection for discharge temperature
sensor. Note: This is applicable for two stage
compressor operations only.
P5 Two position square pin header. P5 provides selection of
the 30-second compressor delay option.
P6 Eight position header. P6 provides connections for the fac-
tory test connections.
Test: Defrost Temperature Termination Shunt
(Jumper) Pins--The defrost board selections are: 50, 70,
90, and 100°F (10, 21, 32 and 38°C). The shunt
termination pin is factory set at 50°F (10°C). If the
temperature shunt is not installed, the default termination
temperature is g0°F (32°C).
Note: The Y1 input must be active (ON) and the "0" room
thermostat terminal into board must be inactive.
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 10.
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.
DEFROST BOARD PRESSURE SWITCH
CONNECTIONS
The unit's automatic reset pressure switches (LOPS - $87
and Ht PS - $4) are factory-wired into the defrost board on
the LO-PS and Ht-PS terminals, respectively.
Low Pressure Switch (LO-PS)
When the low pressure switch trips, the defrost board will
cycle off the compressor, and the strike counter in the
board will count one strike. The low pressure switch is
ignored under the following conditions:
• during the defrost cycle and 90 seconds after the
termination of defrost
• when the average 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 board will
cycle off the compressor, and the strike counter in the
board will count one strike.
DEFROST BOARD PRESSURE SWITCH SETTINGS
• High Pressure (auto reset) - trip at 590 psig; reset at
418 psig.
• Low Pressure (auto reset) - trip at 25 psig; reset at 55
psig.
Low Ambient Thermostat Pins -P3 provides selection of
the Y2 compressor lock-in temperature. The XP14 series
heat pumps do not use a Y2 compressor and therefore
these pins are not active.
FIVE-STRIKE LOCKOUT FEATURE
The internal control logic of the board counts the pressure
switch trips only while the Y1 (Input) line is active. If a
pressure switch opens and closes four times during a Y1
(Input), the control logic will reset the pressure switch trip
counter to zero at the end of the Y1 (Input). If the pressure
switch opens for a fifth time during the current Y1 (Input),
the control will enter a lockout condition.
The five-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.
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