Lennox XP14 Elite Series, Elite xP14-018, Elite xP14-024, Elite xP14-030, Elite xP14-036 Installation Instructions Manual

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,1_2008 Lennox industries Inc.

Dallas, Texas, USA

INSTALLATION
INSTRUCTIONS

XP14 Elite ®Series Units

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

WARNING

CAUTION

A IMPORTANT

A IMPORTANT

HEAT PUMP UNITS _]_Technical

505,244M Litho U.S.A.

04108
Supersedes 11/07

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,

.ELL1 Publications

04/08

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

1 - Assembled XP14 outdoor unit

Check the unit components for shipping damage. If you

find any damage, immediately contact the last carrier,

Page 1

505,244M

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

RUN

DEFROST

UNIT SUPPORT

FEET _/

TOP VIEW

C

DISCHARGE AIR t

SIDE VIEW

i i

(

SUCTION LINE VALVE

FILTER DRIER/

LIQUID LINE
CONNECTION

LIQUID LINE
CONNECTION

ELECTRICAL
INLETS

VAPOR LINE

/CONNECTION

4-1/4( 4-3/4

108) (121)

CONNECTIONS

f _

t

9-1/2

REVERSING

LIQ

PARTS ARRANGEMENT

B "-=

r

1

A

2(51)

1

I I I__._J

1 (25) SIDE VIEW

FEET\

UNIT SUPPORT _

18-7/8 @ @ ®

(429)

HIGH PRESSURE
SWITCH

VAPOR LINE

VAPOR VALVE AND

BAUGE PORT/SUCTION

LINE CONNECTIONS

-[

26-7/8

(683)

(

_ _ 1(_413)

XP14-018 TO -030 BASE SECTION

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)

505244M 04/08

(2il)

8-1/4
(210)

i_

Page 2

8-3/4
(222)

t

3-1/8

(79) _ (781)

XP14-036 TO -060 BASE WITH

ELONGATED LEGS

_2

3-3/4

(95)

_4-5/8

(117)

WARNING

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

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.

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,

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.

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.

BU,LD,NG

STRUCTURE
MOUNTING_ --7-

SLAB

-/

GROUND LEVEL

Figure 2. Slab Mounting Options

Page 3

.....1

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

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.

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" SCH 40 male threaded adaptors

which can bethreaded into the female threaded adaptors

to make additional adjustments to the level of the unit,

TYPICAL i-L
INSTALLATION __'-_

WITH 3 TO 4 IN.
EXTENDERS

IMPORTANT! STRUCTURE
INSTALLED _ BUILDING

ALWAYS USE MOUNTING _ ---FSTABILIZER
BRACKET ON SLAB

ELEVATED
INSTALLATIONS

STABILIZER
BRACKETS

GROUND LEVEL

Figure 5. Elevated Slab Mounting using Feet

Extenders

,& IMPORTANT

505244M 04/08

Page 4

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

STABILIZING BRACKET
(18 GAUGE METAL - 2"

WIDTH; HEIGHT AS

REQ'D)

#101-1/4" LONG HEX

HD SCREW &
FLATWASHER

PLASTIC ANCHOR - USE IF CONCRETE
(HOLE DRILL 1/4"); NOT IF PLASTIC SLAB

(HOLE DRILL 1/8").

COIL

BASE PAN

_J _ Mounting __

STABILIZING MINIMUM 1

l Deck Top

ANGLE

PERS'DE\2 L

'I _:_ 'l'

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,

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

r wind barrier I

24"

inlet air ,_ _641'0 mm)

4_ inlet air

inlet al_

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

O inlet air

Figure 7. Rooftop Application with Wind Barrier

Figure 8. Removing/Installing Louvered Panels

(Details A, B and C)

Page 5

XP14 SERIES

MAINTAINMINIMUMPANELANGLE(ASCLOSETOPARALLELWITHTHEUNIT

ASPOSSIBLE)WHILEINSTALLINGPANEL.
ANGLEMAYBETOO SIDETOMAINTAIN

EXTREME --_ FULLY_ENGAGEDTABS

PREFERREDANGLE

FORINSTALLATION

Detail D

Figure 9. Removing/Installing Louvered Panels

HOLDDOORFIRMLYTOTHEHINGED

(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 inthe 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

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,)

color-coded, temperature
rating 35°C minimum

,WARNING

505244M 04/08

Page 6

Thermostat Indoor Unit Outdoor Unit

24Vpower

common _ L

1st-stage FE

E

_L

......... ©1

1st-stage
auxiliary heat (_ I

@1
OI

indoor blower

®1

@comp....... GI

(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC
THERMOSTAT AND INDOOR UNIT.)

Thermostat Indoor Unit Outdoor Unit

. 24V power 24V power

©c ........ 2®-..0 ........

(_. emergency heat i -- -- //_i OUTDOOR

(_). 1st-stage 'auxiliary heat .(_ // 1st-stage

',@ :'-:/- _ EMERGENCY

] I_) _ HEAT RELAY

THERMOSTAT

i

auxiliary h_t-- (_

k@"

indoor blower

reversing valve

®

compressor

G

(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC
THERMOSTAT AND INDOOR UNIT.)

@
@.

®
@

Figure 11. Outdoor Unit and Blower Unit Thermostat

Designations

"34O

CI2

CAPAC l TOR

HRI

AIOB

DEFROST CONTROL

;01L
_MB
)IS

OUT

OPS

f2 OUT

;0M

fl OUT

-PS

if--,

I_f

iv v

C_SSOR
CONTACTOR

Figure 12. Outdoor Unit and Blower Unit Thermostat

Designations (with Emergency Heat Relay)

RT21 RTI5

DEFROST AMBIENT

COIL SENSOR

SENSOR

FOR _ WITH COPPER CONDUCTORS
ORLY.RERERTO UNIT RATIN6

PLATE FOR ¥INIMII_I CII_IIT

KI

s_r

HI_

PRESSORE

SWITCH

Q

PRESSURE
SWITCH

©

AI08 I--

KI

LI

REVERSING

VAL_

®

A_PACITY ANOgAXINUff OVER-

,6_ REFER TO COMPRESSORIN U_IT

CtI_NT RqOTECTION SIZE

OR DEATH.UNIT MI_T B_ OR(X/NOEDIN

m_ SENSOR,OmOOOR_ve (_m_L)

_ITH NATION_. AND LOCALCO_S,

,r=, C831 lily

x_2av

_3)"1

._&,?_-- [.--.__

A2 SIGNATURE

81MZ8

T_ISTED

®-I----

r- -- --

-@-I----

-@-I----

I F----

I

D

I

Ig

I

II

Q-

.IJ

-- --t-- d

--J

@

Figure 13. Typical XP14 Wiring

Page 7

-Jl'

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. Ifan 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.

Table 3. Refrigerant Line Sets

Valve Field

Model

-018

-024 (10 mm) (19 mm)

-030

-036

-042 (10 mm) (22 mm)

-048

-060 (10 ram) (29 ram)

Connections

Liquid Vapor
Line Line

3/8 in. 3/4 in

3/8 in. 7/8 in

3/8 in, 1-1/8 in.

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 toconsider the
following points:

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.

3/8 in, 1-1/8 in. Field
(10 (29 mm) Fabricated

mm)

(4.6 m - 15 m)

• 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'.11111III 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

505244M 04/08

Page 8

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\

/ /

METAL FLOOR JOIST OR
SLEEVE ROOF RAFTER

TAPE OR WIRE TIE

8 feet WIRE TIE

WIRE TIE

(Around vapor line only)

TAPE OR

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

the liquid line to the vapor line.

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 LIQUIDLINE

IMPORTANT!
Refrigerant

lines must
not contact

structure.

-_. WIRE TIE
INSIDE WALL

- STRAP

SLEEVE

VAPOR LINE WRAPPED

WIRE TIE

_" .---------WOOD BLOCK

.___---- WIRE TIE

STRAP

[_ CAULK

PVC PiPE FIBERGLASS

iNSULATiON

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

Strap Liquid
Line To Va- Strap Liquid Line

por Line To Vapor Line

UID 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

WARNING

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:

WALL
STUD

LIQUID LINE

NOTE - The tube end must stay bottomed in the fitting

I

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,

XkIMPORTANT

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,

505244M 04/08

kWARNING

Page 10

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 0psig,
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)

EXISTING VAPOR LINE

EXISTING LIQUID LINE LIQUID LINE

RECOVERY CYLINDER

VAPOR LINE

SERVICE VALVE

SERVICE VALVE

NOTE - The inverted HCFC-22 cylinder must

Tank ReturnInlet

, Discharge

RECOVERY MACHINE

contain at least the same amount of refrigerant
as was recovered from the existing system.

Figure 18. Flushing Connections

Page 11

Low High

Pressure Pressure

Opened ! ! Closed

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

TUBES X

ACCESS FITTIN/
(no valve core) SENSING BULB

On smaller lines, 1/2" & smaller

bo,bmaybe•

mounted on top

1 pi'EsNuISalN°(n re qu' red )

I (see no_e)

_ _g

NOTE - If necessary, remove
HCFC-22 flow control device

(fixed orifice/check expansion
valve) from existing line set before

Do not mount bulb

on bo{tom of line

5/8" & larger
suction line

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.

505244M 04/08

Page 12

CHECK

EXPANSIONVAL_

LOW HUGH

PRESSUREPRESSURE

DISTRIBUTOR

BIFLOW

FILTE

DRIER OUTDOOR

COIL

OUTDOOR UNiT

REVERSING VALVE

NOTE - ARROWS INDICATE
DIRECTION OF REFRIGERANT FLOW

INDOOR I

COMPRESSOR

v

NOTE- Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant

lines and indoor coil. Use vapor gauge port to measure vapor pressure during charging.

Figure 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 1on 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.

Vapor Line Ball Valve

VAPOR

SERVICE .INE

POR_ /ALVE

/APOR

CHECK EXPANSION VALVE --

VAPOR

SERVICE

PORT

ilhd II

:ll--

INDOOR

COIL

3. Replace the stem cap. Tighten finger tight, then torque
per table 1 on page 3.

SCHRADER CAP

VALVE ]OPEN TO

LINE SET WHEN

VALVE IS CLOSED ",LLJ

]FRONT SEATED)] _

OUT-
DOOR

COl

SERVICE
PORT CAP

Valve in closed position

STEM INSERT HEX

WRENCH HERE,

/

_VALVE FRONT-SEATED)

Valve in open position

Figure 21. Front-Seated Liquid Line 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.

CAP

USE ADJUSTABLE WRENC

TO OPEN: ROTATE STEM _STEM
COUNTER-CLOCKWISE 90 °.

TO CLOSE: ROTATE STEM
CLOCKWISE 90° .

TO
INDOO

R COIL SERVICE

STEM

SERVICE PORT

(_SCHRADER VALVE

TO
OUTDOOR

COIL

BALL (SHOWN

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 [

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.

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 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

WARNING

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 2 ounces (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

I

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.

505244M 04/08

Page 14

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 15ft.
(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

A IMPORTANT

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:

CFM =

Check indoor airflow using the step procedures as
illustrated in figure 23.

Amps x Voltsx 3.41

1.08x Temperature rise (F)

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

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

70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

m

DRY

BULB

9o

All temperatures are INDOOR WET
expressed in °F COIL BULB

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,

_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 inthe 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 °.

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

+ + =

505244M 04/08

Page 16

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

Table 7. Adding Charge per Indoor Unit Match using Subcooling Method

Use

!___ ___ cooling

mode

_ 60°F (15°C) -

+use

_I heating

mode

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

INDOOR HEAT Cooling Heating

Subcool Target

MATCH-UP:,..O.,.PUMPI +°F1I I°F1

CBX27UH-018/024 13 7
CBX32MV-018/024 15 7

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

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).

*Add

charge

• +

o 8
o o

INDOOR HEAT Cooling Heating

MATCH-UPPO+

CX34-31A/B 11 6
CX34-38A/B 11 6
CX34-43B/C 15 11

CX34-43B/C, -50/60C 13 6

Subcool Target

I I ll'3,+"I I I llm=.)

through 10 to verify charge.

*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

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-

Subcool Target

I ll_ [,+Immmm

505244M 04/08

Page 18

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

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,

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.

Page 19

Note - Component Locations Vary by Board Manufacturer.

TEST PINS

DEFROST

TERMINATION -

PIN SETTINGS

SENSOR PLUG IN

(COIL, AMBIENT, -

& DISCHARGE

SENSORS)

DELAY

REVERSING

VALVE

PRESSURE

SWITCH
CIRCUIT _

CONNECTIONS

PINS

IT'_pI

_ O FAR

0

= I]

0 o#t

o

.o-PS

COMMON

©

Iololololo1_1olol 0

TSTPS Df C _ 0 YI Y2

®

Z @c

@L

o

LOW

AMBIENT

THERMOSTAT
PINS

_ DIAGNOSTIC

LEDS

24V TERMINAL
STRIP

CONNECTIONS

Figure 24. Defrost Control Board

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

HI-PS Connection for high-pressure switch
P1 Seven position square pin header. P1 provides selection of

P2 The following connections are provided in the seven posi-

P3 Five position square pin header. P3 provides selection of

P4 Six position square pin header. P4 provides connections for

P5 Two position square pin header. P5 provides selection of

P6 Eight position header. P6 provides connections for the fac-

contactor

the defrost terminate temperature based on the position of
selection shunt, as well as selection pins for enabling the

field test mode.

tion P2 screw terminal block:
Wl 24 VAC thermostat output for auxiliary heat op-

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-

O 24 VAC thermostat input for reversing valve op-

Y1 24 VAC thermostat input for first stage compres-

the Y2 compressor lock-in temperature. Note: This is ap-

plicable for two stage compressor operations only.

the temperature sensors:
COIL (P4-5) Ground connection for outdoor coil tem-

AMB (P4-3) Ground connection for outdoor ambient

DIS (P4-1) Ground connection for discharge temper-

the 30-second compressor delay option.

tory test connections.

eration

pressor operation

eration

sor operation

perature sensor.
(P4-6) Connection for outdoor coil temperature

sensor

temperature sensor.

(P4-4) Connection for outdoor ambient tempera-

ture sensor.

ature sensor.

(P4-2) Connection for discharge temperature
sensor. Note: This is applicable for two stage
compressor operations only.

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.

505244M 04/08

Page 20

Actuation--When the reversing valve is de-energized,

the Y1 circuit is energized, and the coil temperature is
below 35°F (2°C), the board logs the compressor run time.

If the board is not calibrated, a defrost cycle will be initiated
after 34 minutes of heating mode compressor run time.

The control will attempt to self-calibrate after this (and all
other) defrost cycle(s).

Calibration success depends on stable system
temperatures during the 20-minute calibration period. If

the board fails to calibrate, another defrost cycle will be
initiated after 90 minutes of heating mode compressor run

time. Once the defrost board 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 board willnot
execute the TEST mode.

Termination--The defrost cycle ends when the coil
temperature exceeds the termination temperature or after

Y1 Active ('O"line inactive) ]

Short test pins for longer than 1
second but less than 2 seconds

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.

Each test pin shorting will result in one test event. For
each TEST the shunt (jumper) must be removed for at

least one second and reapplied. Refer to flow chart as
illustrated in figure 25 for TEST operation.

Test Mode--When Y1 is energized and 24V power is
being applied to the board, a test cycle can be initiated by

placing the termination temperature jumper across the
TEST pins for two to five seconds. If the jumper remains

across the TEST pins longer than five 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 board after power-up. The TEST
pins are ignored and the test function is locked out if the

shunt is applied on the TEST pins before power-up. Board
timings are reduced, the low-pressure switch is ignored

and the board will clear any active lockout condition.

NOTE - The 30-second off cycle is NOT functional when

jumpering the TEST pins.

I

i

Short test pins for more than 2 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.

Test pin short REMAINS in place for more than 5 seconds / Test short REMOVED before maximum

The unit will return to Heat mode un-calibrated with defrost timer set for I
34 minutes. No further test mode operation will be executed until the test The unit will remain in Defrost mode until

short s removed and re apped, j termination on time or temperature

IIf in COOLING Mode

No further test mode
operation will be executed

until the test short is
removed and reapp ed.

Figure 25. Test Mode

Clear any short cycle lockout and 5 strike fault lockout

function, if applicable.

IIIfin Mode IIIfin Mode

The controller will check for ambient
and coil faults (open or shorted). If a

fault exists, the unitwill 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 the unit will go into
Defrost mode.

pins

of 5 seconds

The unit will terminate defrost
and enter Heat Mode
un-calibratedwith defrost timer
set for 34 minute test. No

further test mode operation will
be executed until the test short

is removed and reapplied.

a

Page 21

XP14 SERIES

DEFROST BOARD DIAGNOSTICS

See table 10 to determine defrost board operational conditions and to diagnose cause and solution to problems.

Table 10. Defrost Control Board Diagnostic LEDs

DS2 DSl
Green Red

OFF OFF Power problem and C or board failure.

Simultaneous Unit operating normally or in standby
SLOW Flash Normal operation mode. None required.

Alternating SLOW 5-minute anti-short cycle Initial power up, safety trip, end of

Flash delay room thermostat demand.

Simultaneous Sensor being detected open or shorted or out of temperature range. Board will revert to time/

FAST Flash Ambient Sensor Problem temperature defrost operation. (System will still heat or cool).

Alternating Coil Sensor Problem Sensor being detected open or shorted or out of temperature range. Board will not perform

FAST Flash demand or time/temperature defrost operation. (System will still heat or cool).

Condition/Code Possible Cause(s) Solution

1 Check control transformer power (24V).

No power (24V) to board terminals R 2 If power is available to board and LED(s) do not

light, replace board.

None required (Jumper TEST pins to override)

ON Circuit Board Failure not clear, replace board.

ON Indicates that board has internal component failure. Cycle 24 volt power to board. If code does

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

OFF Low Pressure Fault

OFF ON Low Pressure LOCKOUT

SLOW
Flash

1 Restricted air flow over indoor or

outdoor coil.

2 Improper refrigerant charge in

system,

3 Improper metering device installed or

SLOW

Flash OFF High Pressure Fault

incorrect operation of metering

device,

4 Incorrect or improper sensor location

ON OFF High Pressure LOCKOUT

SLOW Discharge Line Temperature

Flash ON Fault

FAST Discharge Line Temperature
Flash ON LOCKOUT

OFF across pins P4-1 and P4-2. If the resistor is missing or damage then this fault code will be

Fast
Flash This model does not have a defrost line sensor, therefore this code is not applicable.

Fast
Flash Discharge Sensor Fault

OFF Discharge Sensor

LOCKOUT

or connection to system.

This model does not have a defrost line sensor, therefore this code is not applicable.

The XP14 series units does not use a defrost line sensor, However, a resistor is installed

displayed.

1 Remove any blockages or restrictions from coils

and/or fans. Check indoor and outdoor fan motor for
proper current draws.

2 Check system charge using approach and subcool-

ing temperatures,

3 Check system operating pressures and compare to

unit charging charts.

4 Make sure all pressure switches and sensors have

secure connections to system to prevent refrigerant
leaks or errors in pressure and temperature mea-

surements.

Table 11. Sensor Temperature/Resistance Range

Sensor Temperature Range °F (°C) Resistance Values Range (ohms) Pins/Wire Color
Outdoor (Ambient) -35 to 120 (-37) to (48) 280,000 to 3750 3 and 4 (Black)

Coil -35 to 120 (-37) to (48) 280,000 to 3750 5 and 6 (Brown)
Note: Sensor resistance decreases as sensed temperature increases (see figure 26).

lOO

90
8o

70 | 11775

60 |B 15425

50 _119975

30 [] 34375

w

20 m46275

10 62700 85300

o I I

505244M 04/08

5750

m, 7450

i

26200

III

10000 30000 50000 70000 90000

RESISTANCE(OHMS)

Figure 26. Ambient and Coil Sensors

Page 22

DEFROST BOARD
DEFROST

SENSOR

HARNESS

Figure 27. Sensor Locations

Ambient Sensor--The ambient sensor (shown in figure

27) 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 board will not perform demand

defrost operation. The board 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.

Coil Sensor--The coil temperature sensor (shown in

figure 27) considers outdoor temperatures below -35°F

(-37°C) or above 120°F (48°C) as a fault. If the coil
temperature sensor is detected as being open, shorted or

out of the temperature range of the sensor, the board will
not perform demand or time/temperature defrost

operation and will display the appropriate fault code.
Heating and cooling operation will be allowed in this fault

condition.

OPERATIONAL DESCRIPTION

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

Normal Mode--The demand defrost board monitors the
O line, to determine the system operating mode
(heat/cool), outdoor ambient temperature, coil

temperature (outdoor coil) and compressor run time to
determine when a defrost cycle is required.

050
APPLY GREASE BETWEEN
RETURN BEND AND SENSOR

CLIP COIL TEMPSENSORFROM

THE DEFROSTBOARDON THE
HAIRPIN SHOWN.6fh HAIRPIN

UP ON INSIDE ROW. WIRES

ROUTED DOWN

Calibration Mode--The board is considered uncalibrated

when power is applied to the board, after cool mode

operation, or if the coil temperature exceeds the
termination temperature when it is in heat mode.

Calibration of the board occurs after a defrost cycle to
ensure that there is no ice on the coil. During calibration,
the temperature of both the coil and the ambient sensor

are measured to establish the temperature differential

which is required to allow a defrost cycle.

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

DETAILED DEFROST SYSTEM OPERATION
Defrost Cycles--The demand defrost control board

initiates a defrost cycle based on either frost detection or
time,

• Frost Detection--If the compressor runs longer than
34 minutes and the actual difference between the clear

coil and frosted coil temperatures exceeds the
maximum difference allowed by the control, a defrost

cycle will be initiated,

IMPORTANT - The demand defrost control board will
allow a greater accumulation of frost and will initiate
fewer defrost cycles than a time/temperature defrost

system.

• Time--If six hours of heating mode compressor run
time has elapsed since the last defrost cycle while the

Page 23

XP14 SERIES

coil temperature remains below 35°F (2°C), the
demand defrost control will initiate a defrost cycle.

2, Disposable Filter--Disposable filters should be

replaced with a filter of the same type and size,

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

,WARNING I

Before the start of each heating and cooling season, the

following service checks should be performed by a

qualified service technician. First, turn off electrical power
to the unit prior to performing unit maintenance.

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

NOTE - It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which

are corrosive or which block airflow across the coil
(e.g., pet urine, cottonwood seeds, etc.)

• Visually inspect the refrigerant lines and coils for leaks.

• Check wiring for loose connections.

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

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

• Check, clean (or replace) indoor unit filters.

• Check the refrigerant charge and gauge the system
pressures.

• Check the condensate drain line for free and
unobstructed flow; clean, if necessary.

• Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM

Refer tothe unit information service manual for pressure
drop tables and procedure.

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

instruction.

MAINTENANCE

In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.

1. Air Filter--Ask your Lennox dealer to show you where
your indoor unit's filter is located. It will be either at the
indoor unit (installed internal or external to the cabinet)

or behind a return air grille in the wall or ceiling. Check
the filter monthly and clean or replace it as needed.

IMPORTANT

3, Reusable Filter--Many indoor units are equipped

with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow

filter to dry completely before returning it to the unit or
grille.

NOTE - The filter and all access panels must be in
place any time the unit is in operation.

4, Electronic Air Cleaner--Some systems are

equipped with an electronic air cleaner, designed to
remove airborne particles from the air passing through

the cleaner. If your system is so equipped, ask your
dealer for maintenance instructions.

5. Indoor Unit--The indoor unit's evaporator coil is
equipped with a drain pan to collect condensate

formed as your system removes humidity from the
inside air. Have your dealer show you the location of

the drain line and how to check for obstructions. This
would also apply to an auxiliary drain, if installed.

A IMPORTANT

. Outdoor Unit--Make sure no obstructions restrict

airflow to the outdoor unit. Leaves, trash or shrubs
crowding the unit cause the outdoor unit to work harder

and use more energy. Keep shrubbery trimmed away
from the unit and periodically check for debris which

collects around the unit.
When removing debris from around the unit, be aware

of metal edges on parts and screws. Although special
care has been taken to keep exposed edges to a
minimum, physical contact with metal edges and
corners while applying excessive force or rapid motion
can result in personal injury.

Cleaning of the outdoor unit's coil should be performed
by a trained service technician. Contact your dealer
and set up a schedule (preferably twice a year, but at
least once a year) to inspect and service your air
conditioning or heat pump system.

505244M 04/08

Page 24

HEAT PUMP OPERATION
Your new Lennox heat pump has several characteristics

that you should be aware of:

• Heat pumps satisfy heating demand by delivering
large amounts of warm air into the living space, This
is quite different from gas- or oil-fired furnaces or an

electric furnace which deliver lower volumes of

considerably hotter air to heat the space,

• Do not be alarmed if you notice frost on the outdoor coil
in the winter months. Frost develops on the outdoor

coil during the heating cycle when temperatures are
below 45°F (7°C). An electronic control activates a

defrost cycle lasting 5 to 15 minutes at preset intervals
to clear the outdoor coil of the frost,

• During the defrost cycle, you may notice steam rising

from the outdoor unit. This is a normal occurrence. The
thermostat may engage auxiliary heat during the

defrost cycle to satisfy a heating demand: however,
the unit will return to normal operation at the

conclusion of the defrost cycle,

In case of extended power outage...

The heat pump is equipped with a compressor crankcase
heater which protects the compressor from refrigerant

slugging during cold weather operation,
If power to your unit has been interrupted for several hours

or more, set the room thermostat selector to the
Emergency Heat setting to obtain temporary heat without

the risk of serious damage to the heat pump,
tn Emergency Heat mode, all heating demand is satisfied

by auxiliary heat; heat pump operation is locked out. After a
six-hour compressor crankcase warm-up period, the

thermostat can be switched to the Heat setting and normal
heat pump operation may resume,

THERMOSTAT OPERATIONS
Though your thermostat may vary somewhat from the

description below, its operation will be similar.
Temperature Setting Levers

Most heat pump thermostats have two temperature
selector levers: one for heating and one for cooling. Set the

levers or dials to the desired temperature setpoints for both
heating and cooling. Avoid frequent temperature

adjustment; turning the unit off and back on before
pressures equalize puts stress on the unit compressor.

Fan Switch
In AUTO or INT (intermittent) mode, the blower operates

only when the thermostat calls for heating or cooling. This
mode is generally preferred when humidity control is a

priority. The ON or CONT mode provides continuous
indoor blower operation, regardless of whether the
compressor or auxiliary heat are operating. This mode is

required when constant air circulation or filtering is desired,

System Switch
Set the system switch for heating, cooling or auto

operation, The auto mode allows the heat pump to
automatically switch from heating mode to cooling mode to

maintain predetermined comfort settings, Many heat
pump thermostats are also equipped with an emergency
heat mode which locks out heat pump operation and

provides temporary heat supplied by the auxiliary heat,
Indicating Light
Most heat pump thermostats have an amber light which

indicates when the heat pump is operating in the
emergency heat mode,

Temperature Indicator
The temperature indicator displays the actual room

temperature,
Programmable Thermostats
Your Lennox system may be controlled by a

programmable thermostat. These thermostats provide the
added feature of programmable time-of-day setpoints for

both heating and cooling, Refer to the user's information
manual provided with your particular thermostat for
operation details.
Preservice Check

If your system fails to operate, check the following before
calling for service:

• Check to see that all electrical disconnect switches are
ON.

• Make sure the room thermostat temperature selector
is properly set.

• Make sure the room thermostat system switch is
properly set.

• Replace any blown fuses, or reset circuit breakers.

• Make sure unit access panels are in place.

• Make sure air filter is clean,

• Identify the unit model number before calling,

OPTIONAL ACCESSORIES
Refer to the Engineering Handbook for optional

accessories that may apply to this unit, The following may
or may not apply:

• Loss of charge kit

• High pressure switch kit

• Mild weather kit

• Compressor monitor

• Compressor crankcase heater

• Mounting bases

• Timed off control

• Stand-off kit

• Sound cover

• Low ambient kit

• Monitor kit

• SignatureStat'" room thermostat

Page 25

XP14 SERIES

Job Name

Job no.

Date

Job Location
Installer

Unit Model No,

Serial No.

Nameplate Voltage
Rated Load Ampacity

Compressor Amperage:

Maximum Fuse or Circuit Breaker
Electrical Connections Tight? _1

Indoor Filter clean? _1

Indoor Blower RPM __ S.P. Drop Over Indoor (Dry)
Vapor Pressure;

Refrigerant Lines: - Leak Checked?
Service Valves: --- Fully Opened? _]

Properly Insulated?

Caps Tight? _]

SEQUENCE OF OPERATION

Heating Correct?

Cooling Correct?

City
City

State
State

Service Technician

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

Outdoor Fan Checked?

Voltage With Compressor Operating

THERMOSTAT

Calibrated? _ Properly Set? _ Level?

505244M 04/08

Page 26