Lennox HP13 Installation Instructions Manual

INSTALLATION

';_)2007 Lennox industries Jnc,

0( us

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

A CAUTION

A IMPORTANT

®

Dallas, Texas, USA

WARNING

INSTRUCTIONS

HP13 Series Units

HEAT PUMP UNITS _Technical
505,076M LLJJ Publications

06107 LithoU.S.A.
Supersedes 07/06

HP13 Outdoor Unit ............................ 1

Shipping & Packing List ........................ 1

General Information ........................... 3

Unit Dimensions ............................... 2

Setting the Unit ............................... 3

Removing Panels ............................. 5

Electrical ..................................... 6

Refrigerant Piping ............................. 8

Refrigerant Metering Device .................... 10

Manifold Gauge Set ........................... 10

Service Valves ................................ 11

Leak Testing .................................. 11

Evacuation ................................... 12

Start-Up ...................................... 12

Refrigerant Charging ........................... 13

System Operation ............................. 15

Defrost System ............................... 15

Maintenance .................................. 16

Optional Accessories .......................... 16

Homeowner Information ........................ 17

Thermostat Operation .......................... 17

Start-Up and Performance Check List ............ 18

X_ IMPORTANT

06/07

IIIlllllllllllllllllllllllllllllllllllll

Lennox Elite ® Series HP13 outdoor units are approved
and warranted only for installation with specially
matched indoor coils, line sets, and refrigerant control

devices aC designated by Lennox. Refer to Lennox
engineering handbook for check expansion valve
(CTXV) kits which may need to be ordered separately.

1 - Assembled HP13 outdoor unit

Check unit for shipping damage. Consult last carrier
immediately if damage is found.

Page 1

505,076M

IIIllllllllllllllllllllllllllllllHlllllllll

TOP VIEW

4 C

DISCHARGE AIR t

f--

/

'X/

CONTACTOR

SUCTION LINE

CONNECTION FILTER DRIER/

CONNECTIONS

LIQUID LINE
CONNECTION

LIQUID LINE
CONNECTION

ELECTRICAL

/ INLETS

VAPOR LINE

JCONNECTION

RUN

CAPACITOR

DEFROST

BOARD

REVERSING

VALVE

LIQUID LINE

HP13 PARTS ARRANGEMENT

A

,OUTDOOR FAN

-COMPRESSOR

HIGH PRESSURE
SWITCH
(-018 MODEL ONLY)

, VAPOR LINE

VAPOR VALVE AND

- GAUGE PORT/SUCTION
LINE CONNECTIONS

q

UNIT SUPPORT
FEET

8-1/2
(2"

8-3/4

(2

HP13-018, -024, -030, AND -036

HP13 A

-018 35 (889)

-024 35 (889)

-030 31 (787)

-036 35 (889)

-042 35 (889)

-048 39 (991)

-060 39 (991)

SIDE VIEW

(343)

BASE SECTIONS

B

27 (686)
27 (686)

27 (686)
27 (686)

30-1/2 (775)

30-1/2 (775)

35-1/2 (902)

I I

C

28 (711)
28 (711)

28 (711)
28 (711)
35 (889)

35 (889)

39-1/2 (1003)

4-1/4 4-3/4
(108) (121)

f f

9-1/2

41)

8-1/4
(210)

l

D

13-7/8 (352) 7-3/4 (197)

16-7/8 (429) 8-3/4 (222)

E F

2(51) [_-

J

-

UNIT SUPPORT / "_

1 (25)

N

I I i i

SIDE VIEW

FEET\

D (_ @ C)

E

l

HP13 BASE WITH ELONGATED LEGS

G H J K

3-1/4 (83)

3-1/8 (79)

27-1/8 (689)

30-3/4 (781)

3-5/8 (92)

4-5/8 (117)

4-1/2 (114)

3-3/4 (95)

-r

K

_l

J

----I-

20-5/8 (524)

26-7/8 (683)

505076M 06/07

Page 2

WARNING

These instructions are intended as a general guide and do
not supersede national or local codes in any way.

Authorities having jurisdiction should be consulted 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

Parts Recommended Torque

Service valve cap 8 ft.- lb. 11 NM
Sheet metal screws 16 in.- lb. 2 NM

Machine screws #10 28 in.- lb. 3 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 8 ft.- lb. 11 NM

CAUTION

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.

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 clearanceof30in. (762mm)mustbe maintainedon
oneof the sidesadjacentto the control box+

Clearanceto one of the otherthree sides must be 36 in. (914
mm)

Clearanceto one of the remainingtwo sides may be 12 in+(305
mm) and the final side may be 6 in. (152mm),

A clearanceof24 in, (610mm) must be maintained between
two units.

48 in. (1219mm)clearancerequired on top of unit,

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+

1+ Place a sound-absorbing material, such as Isomode,

under the unit if it will be installed in a location or

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".

Page 3

HP13 SERIES

INSTALLUNITLEVELOR,IFONASLOPE,MAINTAINSLOPE

TOLERANCEOF2DEGREES(OR2INCHESPER5FEET

[50MMPER1.5M])AWAYFROMBUILDINGSTRUCTURE.

BUILDING
STRUCTURE

MOUNTING _ i T
SLAB

GROUND LEVEL

__L

Figure 2. Slab Mounting Options

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

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. Additional couplers can be used to make
additional adjustments to the level of the unit.

NOTE - Keep the height of extenders short enough to
ensure a sturdy installation. If it is necessary to extend
further, consider a different type of field-fabricated
framework that is sturdy enough for greater heights.

Base

Leg Detail

2" (50.8ram)

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 __,,,t
INSTALLATION
WITH 3 TO 4 IN.

EXTENDERS

IMPORTANT! STRUCTURE
INSTALLED _ BUILDING

ALWAYS USE MOUNTING _ i TSTABILIZER
BRACKET ON SLAB
ELEVATED

INSTALLATIONS

STABILIZER
BRACKETS

GROUNDLEVEL

Figure 3. Elevated Slab Mounting using Feet

Extenders (Small-Base Units)

505076M 06/07

Figure 5. Elevated Slab Mounting using Feet

Extenders

Page 4

IMPORTANT

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
practices; replace the panels after installation is complete.

Slab Side Mounting

prevailing winter winds

wind barrier ]

24"

inlet air ,_ _641'0 ram)

inlet air

inlet a[_

O inlet air

Figure 7. Rooftop Application with Wind Barrier

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 (fig. 7).

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.

ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY,
2 BRACKETS PER SIDE, 2" FROM EACH CORNER.

Figure 6. Installing Stabilizer Brackets

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,

LIP

SCREW

HOLES

Detail

J

ROTATE IN THIS

DIRECTION; THEN DOWN
TO REMOVE PANEL

Figure 8. Removing/Installing Louvered

Panels (Details A, B and C)

Remove the Iouvered panels as follows:

1, Remove 2 screws, allowing the panel to swing open

slightly (see figure 8).

2. Hold the panel firmly throughout this procedure.
Rotate bottom corner of panel away from hinge corner
post until lower 3 tabs clear the slots (see figure 8,

Detail B),

Page 5

HP13 SERIES

UTDOOR
FAN

PURPLE
BLACK

ORANGE

RED

CAPACITOR

START

DUAL
CAPACITOR

DEFROST CONTROL

,j! o +

BLACK

POTENTIAL _M_SOR (_

o_- ©

Y1ou_

--C

--L

--R

--0

--YI

COMPRESSOR

CRANKCASE

HEATER

LLOW

CONTACTORI / I

DEFROST.ff'"x _'\,REVERSING

THERMOSTAT_ _VALVE

*MAY BE OPTIONAL

Figure 9. Typical Field Wiring Diagram

3. Move panel down until lip of upper tab clears the top MAINTAINMINIMUMPANELANGLE(AS CLOSETOPARALLELWITHTHEUNIT
slot in corner post (see figure 8, Detail A). AS POSSIBLE) WHILEINSTALLINGPANEL.

ANGLE MAY BE TOO SIDE TO MAINTAIN

CAUTION

EXTREME _-_ FULLY-ENGAGED TABS

PREFERRED ANGLE

/k

20B-230/60/I

EQUIPMENT
GROUND

T

HOLD DOOR FIRMLY TO THE HINGED

Position and Install Panel--Position the panel almost
parallel with the unit (figure 8, Detail D) with the "screw

side" as close to the unit as possible, Then, in a continuous
motion:

• Slightly rotate and guide the lipof top tab inward (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,

505076M 06/07

Detail D

Figure 10. Removing/Installing Louvered

Panels (Detail D)

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.

Page 6

_WARNING

4, Install low voltage wiring from outdoor to indoor unit and

from thermostat to indoor unit, See figures 11 and 12,

1, Install line voltage power supply to unit from a properly

sized disconnect switch,

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

ground,

NOTE - Tofacilitate conduit, a hole is in the bottom of
the control box. Connect conduit to the control box

using a proper conduit fitting.
NO TE - Units are approved for use only with copper

conductors. 24V, Class II circuit connections are
made in the low voltage junction box. Refer to figure 9

for field wiring diagram.
NOTE - For proper voltages, select thermostat wire

gauge per the foflowing chart:

Wire run length AWG # Insulation type
less than 1go' (3Om) 18 color-coded, temperature

more than log' (30m) 16 rating 35°C minimum

NOTE - A complete unit wiring diagram is located

inside the unit control box cover.

3, Install room thermostat (ordered separately) on an

inside wall approximately in the center of the
conditioned area and 5 feet (1.5 m) from the floor. It

should not be installed on an outside wall or where it

can be effected by sunlight, drafts or vibrations,

Thermostat Indoor Unit

24V Power . _ __ 24V j_ower __

1st-stage II

* a-ux_ry heat I_ _ 1st-stage

4 i- _ common

- '- _x_arTh_--

I k

Outdoor Unit

,@

® ._doorb,owor_

reversing

_ valve

compressor

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

Figure 11. Outdoor Unit and Blower

Unit Thermostat Designations

Thermostat

24V power

®-

common

©-

emergency heat i

Indoor Unit Outdoor Unit

\ 24V power

_'_ common
I
I

I

--_ _ EMERGENCY

--47 O ;TA;oR; AY

/---------THERMOSTAT

1st-stage II
auxiliary heat Ii--

_ indoor blower

(_ reversing_alve

compressor

_" SOME CONNECTIONS MAY NOT APPLY. REFER TO

THERMOSTAT AND INDOOR UNIT.)

Figure 12. Outdoor Unit and Blower Unit

Thermostat Designations (with Emergency

@ , Z"'t-s_ge

- ' auxiliary float-- (_

@,

k

@
®

Heat)

®
@

®
©

@

®
@

Page 7

HP13 SERIES

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 2 or use field-fabricated refrigerant lines,
Refer to Refrigerant Piping Guide (Corp. 9351-L9) for

proper size, type, and application of field-fabricated lines.
Field connection sizes are also listed in table 2.

Table 2. Refrigerant Line Sets

Field

Model

-018

-024 (10 mm) (19 mm)

-030

-036

-042 (10 mm) (22 mm)

-048

-060 (10 mm) (29 mm)

Connections

Liquid Vapor
Line Line

3/8 in. 3/4 in

3/8 in. 7/8 in

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

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. 7/8 in L15-65

(10 (22 mm) 15 ft, - 50 ft.
mm) (4.6 m - 15 m)

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

mm)

NOTE - Units are designed for line sets of up to fifty feet (15
m). For applications longer than fifty feet, consult the
Lennox Refrigerant Piping Guide (Corp. 9351-L9). Select

line set diameters from table 2 to ensure that oil returns to
the compressor.

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 13 shows how to place

the outdoor unit and line set.

Install unit /

away from J

windows

Two 90 ° elbows installed in line set
will reduce line set vibration.

Figure 13. Outside Unit Placement and Installation

2. Line Set Isolation--The following illustrations
demonstrate procedures which ensure proper
refrigerant line set isolation. Figure 14 shows how to

install line sets on horizontal runs. Figure 15 shows
how to install line sets on vertical runs. Figure 16

shows how to make a transition from horizontal to
vertical.

To hang line set from joist or rafter,
use either metal strapping material

or anchored WIRE TIE

STRAPPING MATERIAL
(Around vapor line only)

METAL

SLEEVE Strap the vapor line to the joist or

TAPE OR rafter at 8 feet intervals then strap
WIRE TIE the liquid line to the vapor line.

ROOF RAFTER _ --

(Around vapor

8 FEET TAPE OR

WIRE TIE

q Ill II

Figure 14. Refrigerant Line Sets: Installing

Horizontal Runs

505076M 06/07

Page 8

OUTSIDE WALL lines must not contact wall. VAPOR

IMPORTANT - Refrigerant LIQUID

LINE

LINE

TIE

WALL

ANCHORED

HEAVY NYLON

WIRE TIE

WALL
STUD

NOTE - Similar installation

practices should be used if

line set is to be installed on
exterior of outside wall.

VAPOR LINE

WRAPPED WITH

ARMAFLEX LIQUID

must not contact
structure.

P Cv_\ULK

PIPE

FIBERGLASS

WOOD

BLOCK

STRAP

METAL VAPOR LINE -

SLEEVE WRAPPED IN

AUTOMOTIVE

HANGER

WALL o

MUFFLER-TYPE _

METAL VAPOR LINE - LINE

SLEEVE WRAPPED IN

ARMAFLEX

Ii

ARMAFLEX

Strap Liquid

Line

LIQUID

X Strap Liquid

Line

Line To Vapor

LIQUID

por

Figure 15. Refrigerant Line Sets: Installing Vertical

Runs (New Construction Shown)

Figure 16. Refrigerant Line Sets: Transition from

Vertical to Horizontal

Page 9

HP13 SERIES

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. Before making line set connections, use dry nitrogen
to purge the refrigerant piping. This will help to prevent

oxidation and the introduction of moisture into the
system.

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 copper4o-steel

brazing) which are rated for use with HCFC-22
refrigerant. Wrap a wet cloth around the valve body
and the copper tube stub. Braze the line set to the

service valve.

4. Wrap a wet cloth around the valve body and copper
tube stub to protect it from heat damage during

brazing. Wrap another wet cloth underneath the valve
body to protect the base paint.

NOTE - The tube end must stay bottomed in the fitting
during final assembly to ensure proper seating,

sealing and rigidity.

5. If required, install a field-provided check expansion
valve (approved for use with HCFC-22 refrigerant) in

the liquid line at the indoor coil.

Table 3

Indoor Check Expansion Valve Kits

Model Kit Number

HP13-018, -024, -030, -036 LB-85759F
HP13-042, -048 LB-85759G

HP13-060 100188-01

A IMPORTANT

If you install a check expansion valve with an indoor coil

that includes a fixed orifice, remove the orifice before the
check expansion valve is installed. See figure 17 for

installation of the check expansion valve.

// j

DISTRIBUTOR (__ LIQUID LINE

................................_ STUB

HP13 units are used in check expansion valve (CTXV)
systems only. See the Lennox Engineering Handbook for

approved expansion valve match-ups and application
information.

Check expansion valves equipped with Chatleff fittings are
available from Lennox. Refer to the Engineering

Handbook for applicable check expansion valves for use

with specific match-ups. See table 3 for valve kits.

DEFROST --....__.._

THERMOSTAT

!

i

DISTRIBUTOR OUTDOOR UNIT

!

CHECK EXPANSION VALVE

DRIER OUTDOOR

LOW Hugh

PRESSURE PRESSURE

II

COiL

!

NOTE- If installing expansion valve with an indoor coil that in-
cludes a fixed orifice, remove orifice before installing valve.

Figure 17. Metering Device Installation

When checking the unit charge, use a manifold gauge set
that is equipped with "low loss" hoses. Do not use a

manifold gauge set with anything other than a "low loss"
hose. See figure 18 for manifold gauge connections.

NOTE - ARROWS INDICATE
DIRECTION OF REFRIGERANT FLOW

REVERSING VALVE

VAPOR set- SERVICE
vice port J PORT

line

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.

INDOOR UNIT

INDOOR

COIL

o s@:,!.

Figure 18. HP13 Cooling Cycle (Showing Gauge Manifold Connections)

505076M 06/07

f JJ COMPRESSOR _ valve

CHECK EXPANSION VALVE --

Page 10

The liquid line and vapor line service valves (figures 19 and

20) and gauge ports are used for leak testing, evacuating,
charging and checking charge,

STEM INSERT HEX

SCHRADER
VALVE (OPEN TO

LINE SET WHEN
VALVE IS CLOSED

(FRONT SEATED)]

TO
OUT-
DOOR

COIL

SERVICE
PORT CAP

CAP

(VALVE FRONT-SEATED)

TO

INDOOR

COIL

Valve in closed position Valve in open position

Figure 19. Front-Seated Liquid Line Service Valve

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, After accessing, opening,
closing valves, be sure to appropriately tighten the

components [see table 1 (on Page 3) for torque
requirements],

FRONT-SEATED SERVICE VALVE (LIQUID LINE)
The front-seated service valve is shown in figure 19, When

this valve is closed, the service port is open to the line set.

Access the service port and open and close valves as

described in the following paragraphs,

A IMPORTANT

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 turn the stem clockwise to seat the
valve. Tighten it firmly,

3, Replace the stem cap, Tighten finger tight; then torque

per table 1 (Page 3),

Vapor Line Ball Valve

Ball-type service valves (see figure 20) 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,

STEMCAP TO

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

TO CLOSE: ROTATE STEM
CLOCKWISE 90 ° .

TO _SCHRADER VALVE

INDOOF

COIL SERVICE

STEM

SERVICE PORT

CLOSED)

OUTDOOR
COIL

PORT CAP

Figure 20. Bali-Type Vapor Valve (Valve Closed)

After the line set has been connected to the indoor and

outdoor units, check the line set connections and indoor
unit for leaks,

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 (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 (Page 3),

TO CLOSE FRONT-SEATED SERVICE VALVES:

1, Remove the stem cap with an adjustable wrench,

WARNING

kWARNING

Page 11

HP13 SERIES

WARNING I

USING AN ELECTRONIC LEAK DETECTOR OR
HALIDE

1, Connect a cylinder of HCFC-22 to the center port of

the manifold gauge set.

2, With both manifold valves closed, open the valve on

the HCFC-22 cylinder (vapor only).

3, Open the high pressure side of the manifold to allow

the HCFC-22 into the line set and indoor unit. Weigh
in a trace amount of HCFC-22, [A trace amount is a

maximum of 2 ounces (57 g) or 3 pounds (31 kPa)
pressure,] Close the valve on the HCFC-22 cylinder
and the valve on the high pressure side of the manifold
gauge set, Disconnect the HCFC-22 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

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.)

6, Adjust the dry nitrogen pressure to 150 psig (1034

kPa). Open the valve on the high side of the manifold
gauge set which will pressurize line set and indoor unit.

7, After a few minutes, open a refrigerant port to ensure

the refrigerant you added is adequate to be detected.
(Amounts of refrigerant will vary with line lengths.)

Check all joints for leaks, Purge dry nitrogen and
HCFC-22 mixture, Correct any leaks and recheck,

Evacuating the system of non-condensables is critical for
proper operation of the unit. Non-condensables are

defined as any gas that will not condense under
temperatures and pressures present during operation of

an air conditioning system. Non-condensables and water
vapor combine with refrigerant to produce substances that

corrode copper piping and compressor parts.

A IMPORTANT

,

Connect the vacuum pump (with vacuum gauge) to
the center port of the manifold gauge set,

4.

Open both manifold valves; start the vacuum pump,

5.

Evacuate the line set and indoor unit to an absolute
pressure of 23,000 microns (29,01 inches of
mercury). During the early stages of evacuation, it is

desirable to close the manifold gauge valve at least
once to determine if there is a rapid rise in absolute

pressure, A rapid rise in pressure indicates a
relatively large leak, If this occurs, repeat the leak
testing procedure,

NOTE - The term absolute pressure means the total
actual pressure within a given volume or system,
above the absolute zero of pressure. Absolute
pressure in a vacuum is equal to atmospheric
pressure minus vacuum pressure,

,

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.

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

HCFC-22 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 HCFC-22 cylinder and remove

the manifold gauge set,

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.

505076M 0_07

IMPORTANT

Page 12

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

2. Inspect all factory- and field-installed wiring for loose
connections.

3. After evacuation is complete, open the liquid line and
vapor line service valves (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
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.

The unit is factory charged with the amount of HCFC-22
refrigerant indicated on the unit rating plate. This charge is

based on a matching indoor coil and outdoor coil with a 15

foot (4.6 m) line set. For varying lengths of line set, refer to

table 4 for refrigerant charge adjustment.

Table 4. Refrigerant Charge per Line Set Lengths

LiquidLine Oz. per 5 ft. (g per 1.5m)adjust from

SetDiameter 15 ft. (4.6m) line set*
3/8 in. (9.5mm) 3 ounce per 5 ft. (85g per 1.5m)

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

The outdoor unit should be charged during warm weather.
However, applications arise in which charging must occur

in the colder months. The method of charging is

determined by the unit's refrigerant metering device and
the outdoor ambient temperature.

Measure the liquid line temperature and the outdoor
ambient temperature as outlined below:

1, Close manifold gauge set valves. Connect the

manifold gauge set to the service valves,

• low pressure gauge to vapor valve service port

• high pressure gauge to liquid valve service port

2, Connect the center manifold hose to an upright

cylinder of HCFC-22.

3, Set the room thermostat to call for heat. This will

create the necessary load for properly charging the

system in the cooling cycle,

4, Use a digital thermometer to record the outdoor

ambient temperature,

5, When the heating demand has been satisfied, switch

the thermostat to cooling mode with a set point of 68 °F

(20 °C). When pressures have stabilized, use a digital

thermometer to record the liquid line temperature.

6, The outdoor temperature will determine which

charging method to use, Proceed with the appropriate
charging procedure,

CHARGE USING THE WEIGH-IN METHOD--
OUTDOOR TEMPERATURE < 65°F (18°C)

If the system is void of refrigerant, or if the outdoor ambient
temperature is cool, first, locate and repair any leaks and

then weigh in the refrigerant charge into the unit.

1. Recover the refrigerant from the unit.

2. Conduct leak check; evacuate as previously outlined.

3. Weigh in the unit nameplate charge. If weighing
facilities are not available or if charging the unit during

warm weather, use one of the following procedures.

CHARGE USING THE SUBCOOLING METHOD--

OUTDOOR TEMPERATURE < 65°F (18°C)

When the outdoor ambient temperature is below 65°F
(18°C), use the subcooling method to charge the unit. It

may be necessary to restrict the air flow through the
outdoor coil to achieve pressures in the 200-250 psig

(1379-1724 kPa) range. These higher pressures are
necessary for checking the charge. Block equal sections d
air intake panels and move obstructions sideways until the

liquid pressure is in the 200-250 psig (1379-1724 kPa)
range. See figure 21.

side at a time with cardboard or plastic
sheet until proper testing pressures

*Outdoor coil should be blocked one
are reached.

cardboard or plastic sheet
*Four-sided unit shown.

Figure 21. Blocking Outdoor Coil

1. With the manifold gauge hose still on the liquid service
port and the unit's pressure stabilized, use a digital

thermometer to record the liquid line temperature.

2. At the same time, record the liquid line pressure reading.

3. Use a temperature/pressure chart for HCFC-22 to
determine the saturation temperature for the liquid line
pressure reading.

4. Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine
subcooling.

5. Compare the subcooling value results with those in
table 5. If subcooling is greater than shown, recover
some refrigerant. If subcooling is less than shown, add

some refrigerant.

Table 5. HP13 Subcooling Values

o Saturation Temperature °F (°C)
o LiquidLine Temperature °F (°C)
o SubcoolingValue °F (°C)

Model

oF

(°C)*

NOTE - For best results, use the same electronic thermometer to

check both outdoor-ambient and liquid-line temperatures.
*F: +/-1 .O°; C: +/-0.5 °

-018 -024 -030 -036 -042 -048
6 11 8 6 6 4

(3.3) (6) (4.4) (3.3) (3.3) (2.2)

-060

9

(5)

Page 13

HP13 SERIES

CHARGE USING THE APPROACH METHOD -
OUTDOOR TEMPERATURE > 65_F (18<_C)

The following procedure is intended as a general guide and
is for use on expansion valve systems only. For best

results, indoor temperature should be 70°F (21°C) to 80°F
(26°C). Monitor system pressures while charging.

1. Record outdoor ambient temperature using a digital
thermometer,

2. Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize,

3. Compare stabilized pressures with those provided in
table 7, "Normal Operating Pressures," Minor
variations in these pressures may be expected due to
differences in installations, Significant differences
could mean that the system is not properly charged or
that a problem exists with some component in the

system. Pressures higher than those listed indicate
that the system is overcharged, Pressures lower than
those listed indicate that the system is undercharged.
Verify adjusted charge using the approach method,

4. Use the same digital thermometer used to check
outdoor ambient temperature to check liquid line

temperature, Verify the unit charge using the approach
method,

5. The difference between the ambient and liquid
temperatures should match the approach values

given in table 6. If the values do not agree with the
those in table 6, add refrigerant to lower the approach
temperature or recover refrigerant from the system to
increase the approach temperature.

Table 6. HP13 Approach Values

o Liquid Line Temperature °F (°C)
o Outdoor Temperature °F (°C)
o Approach Temperature °F (°C)

Model
oF

(°C)*

NOTE - For best results, use the same electronic thermometer to
check both outdoor-ambient and liquid-line temperatures.

*F: +/-1.0°; C: +/-0.5 °

-018 -024 -030 -036 -042 -048 -060

7 8 9 13 7 9 6

(3.9) (4.4) (5) (7.2) (3.9) (5) (3.3)

A IMPORTANT

Table 7. HP13 Normal Operating Pressures - Liquid +10 & Vapor +5 PSIG*

HP13-018 HP13-024 HP13-030 HP13-036 HP13-042 HP13-048 HP13-060

°F(°C)** Liquid /Vapor Liquid/Vapor Liquid/ Vapor Liquid/ Vapor Liquid/ Vapor Liquid/ Vapor Liquid / Vapor

Cooling

65 (18) 141 / 81 148 / 80 146 / 78 154 / 78 139 / 67 146 / 75 139 / 74

75 (24) 1631 82 1761 82 171 I 79 180 180 163 174 171 I 77 164 177

85 (29) 191 184 206 / 83 201 / 80 216 / 81 191 181 198 178 193 178
95 (35) 222 / 85 240 / 84 233 / 81 246 / 81 220 / 84 229 / 79 230 / 79

105(41) 256 / 87 277 / 86 271 /81 284 / 82 256 / 85 268 / 81 262 / 82
115(45) 296/89 322/87 313/83 328 / 85 294 / 87 308 / 81 300 / 84

Heating

50(10) 192 / 64 185 / 60 198 / 58 196 / 58 204 / 59 197 / 39 213 / 58

40 (4) 180 / 53 176 / 50 188 / 47 185 / 47 195 / 49 189 / 31 200 / 46

30 (-1) 172 / 43 165 / 49 175 / 35 176 / 37 184 / 39 181 / 25 189 / 37

20 (-7) 164 / 34 162 / 31 163 / 26 170 / 30 178 / 32 175 / 18 177 / 32

*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.

505076M 0_07

Page 14

Theoutdoorunitandindoorblowercycleondemandfrom
theroomthermostat.Whenthethermostatblowerswitch

is in the ON position,the indoorbloweroperates
continuously.

FILTERDRIER
Theunitisequippedwithabi-fiowfilterdrier.Seefigure18.

Ifreplacementisnecessary,orderanotheroflikedesign.
CRANKCASEHEATER

A IMPORTANT

EMERGENCY HEAT FUNCTION (ROOM
THERMOSTAT)

An emergency heat function is designed into some room

thermostats. This feature is applicable when isolation of
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
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.

The HP13 defrost system includes two components: a
defrost thermostat and a defrost control.

DEFROST THERMOSTAT

The defrost thermostat is located on the liquid line between
the check expansion valve and the distributor. When

defrost thermostat senses 42°F (5.5°C) or cooler, the
thermostat contacts close and send a signal to the defrost

control board to start the defrost timing. It also terminates
defrost when the liquid line warms up to 70°F (21°C).

DEFROST CONTROL
The defrost control board includes the combined functions

of a time/temperature defrost control, defrost relay,
diagnostic LEDs and terminal strip for field wiring

connections. See figure 22.
The control provides automatic switching from normal

heating operation to defrost mode and back. During
compressor cycle (call for defrost), the control

accumulates compressor run times at 30-, 60-, or

g0-minute field-adjustable intervals. If the defrost
thermostat is closed when the selected compressor run

time interval ends, the defrost relay is energized and
defrost begins.

FIELD SELECT

TIMING PINS

TEST

PINS

COMPRESSOR

DELAY PINS
REVERSING

VALVE

LOW PRESSURE

SWITCH

(OPTIONAL) _

DEFROST

THERMOSTAT

HIGH PRESSURE

SWITCH

(OPTIONAL)

PI (_ FAN

::, @ (_

OBSI

O_S2

- 0-0UT

/L @ _0

fl-OIJT

P2

L W_

-- ¢

DIAGNOSTIC
LEDS

24V TERMINAL
STRIP
CONNECTIONS

SERVICE LIGHT
CONNECTIONS

Figure 22. HP13 Outdoor Unit Defrost

Control Board

DEFROST CONTROL TIMING PINS
Each timing pin selection provides a different

accumulated compressor run time period for one defrost
cycle. This time period must occur before a defrost cycle

is initiated. The defrost interval can be adjusted to 30
(T1), 60 (T2), or 90 (T3) minutes (see figure 22). The

defrost timing jumper is factory-installed to provide a
90-minute defrost interval. If the timing selector jumper

is not in place, the control defaults to a 90-minute defrost
interval. The maximum defrost period is 14minutes and

cannot be adjusted.

A TEST option is provided for troubleshooting. The TEST

mode may be started any time the unit is in the heating
mode and the defrost thermostat is closed or

jumpered. If the jumper is in the TEST position at

power-up, the control will ignore the test pins. When the

jumper is placed across the TEST pins for two seconds,

the control will enter the defrost mode. If the jumper is
removed before an additional 5-second period has
elapsed (7 seconds total), the unit will remain in defrost

mode until the defrost thermostat opens or 14 minutes
have passed. If the jumper is not removed until after the

additional 5-second period has elapsed, the defrost will
terminate and the test option will not function again until the

jumper is removed and re-applied.

COMPRESSOR DELAY

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. The compressor will be
cycled off for 30 seconds going in and out of the defrost

mode when the compressor delay jumper is removed.

Page 15

HP13 SERIES

NOTE - The 30-second "off" cycle is not functional when

jumpering the TEST pins.

TIME DELAY

The timed-off delay is five minutes long. The delay helps to
protect the compressor from short-cycling in case the

power to the unit is interrupted or a pressure switch opens,
The delay is bypassed by placing the timer select jumper

across the TEST pins for 0,5 seconds.

_WARNING

Pressure Switch Circuit
The defrost control incorporates two pressure switch

circuits, The optional high pressure switch (S4) connects
to the board's HI PS terminals. The board also includes

connections for an optional low pressure, or
loss-of-charge-pressure, switch (S87), Switches are

shown in figure 22,
During a single demand cycle, the defrost control will lock

out the unit after the fifth time that the circuit is interrupted
by any pressure switch wired to the control board. In

addition, the diagnostic LEDs will indicate a locked-out
pressure switch after the fifth occurrence of an open

pressure switch (see Table 8). The unit will remain locked
out until power to the board is interrupted, then

re-established or until the jumper is applied to the TEST
pins for 0,5 seconds,

NOTE - The defrost control board ignores input from the
low-pressure switch terminals as follows:

• during the TEST mode,

• during the defrost cycle,

• during the 90-second start-up period,

• and for the first 90 seconds each time the reversing
valve switches heat/cool modes.

Diagnostic LEDs

The defrost board uses two LEDs for diagnostics. The
LEDs flash a specific sequence according to the condition.

Table 8

Defrost Control Board Diagnostic LED

Mode Green LED (DS2) Red LED (DS1)

No powerto control OFF OFF
Normal operation / Simultaneous Slow FLASH

powerto control

Anti-short cycle lock-
out Alternating Slow FLASH

Low pressure switch OFF Slow FLASH

fault (Optional)

Low pressure switch OFF ON
lockout(Optional)

High pressure switch Slow FLASH OFF

fault (Optional)

High pressure switch ON OFF
lockout(Optional)

Before the start of each heating and cooling season, the

following service checks should be performed by a
qualified service technician. First, turn off electrical power

to the unit prior to performing unit maintenance.

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

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

are corrosive or which block airflow across the coil

(e.g., pet urine, cottonwood seeds, etc.)

• Visually inspect the refrigerant lines and coils for leaks.

• Check wiring for loose connections.

• Check voltage at the indoor and outdoor units (with

units operating).

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

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

• Check the refrigerant charge and gauge the system

pressures.

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

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

Refer to the unit information service manual for pressure

drop tables and procedure.

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

instruction.

Refer to the Engineering Handbook for optional

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

• Loss of Charge Kit

• High Pressure Switch Kit

• Mild Weather Kit

• Compressor Monitor

• Compressor Crankcase Heater

• Mounting Bases

• Sound Cover

• Low Ambient Kit

• Monitor Kit

• Dave Lennox Signature Stat'" Room Thermostat

505076M 0_07

Page 16

Inordertoensurepeakperformance,yoursystemmustbe
properlymaintained.Cloggedfiltersandblockedairflow
preventyourunitfromoperatingatitsmostefficientlevel,

1,Air Filter--AskyourLennoxdealertoshowyouwhere

yourindoorunit'sfilterislocated.Itwillbeeitheratthe

indoorunit(installedinternalorexternaltothecabinet)
orbehindareturnairgrilleinthewallorceiling.Check
thefiltermonthlyandcleanorreplaceitasneeded,

2, Disposable Filter--Disposablefilters should be

replacedwithafilterofthesametypeandsize.

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

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.)

IMPORTANT

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,
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 15minutes 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...

If the outdoor temperature is below 50°F (10°C) and power
to your outdoor unit has been interrupted for 6 hours or

longer, observe the following when restoring power to your
heat pump system.

• Set the room thermostat selector to the "Emergency

Heat" setting to obtain temporary heat for a minimum

of 6 hours. This will allow system refrigerant pressures

and temperatures enough time to return to a stabilized

condition.

• In Emergency Heat mode, all heating demand is

satisfied by auxiliary heat; heat pump operation is

locked out. After a six-hour "warm-up" period, the

thermostat can then be switched to the "Heat" setting

and normal heat pump operation may resume.

6. 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.

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.

Page 17

HP13 SERIES

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,

PRESERVlCE CHECK
If your system fails to operate, check the following before

calling for service:

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

• 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,

• Locate unit model number and have it handy before
calling,

Job Name
Job Location
Installer
Unit Model No,

Serial No,

Job no. Date

City State
City State

Nameplate Voltage
Rated Load Ampacity

Compressor Amperage:

Maximum Fuse or Circuit Breaker
Electrical Connections Tight? _1

Indoor Blower RPM

S,P, Drop Over Indoor (Dry)

Indoor Filter clean?

COOLING
Liquid Line Pressure;

Vapor Pressure;

HEATING
Liquid Line Pressure;

Vapor Pressure;

Refrigerant Lines: - Leak Checked? _1 Properly Insulated? _1
Service Valves: --- Fully Opened? _ Caps Tight?

SEQUENCE OF OPERATION

Heating Correct? _ Cooling Correct?

Service Technician

Outdoor Fan

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

Refrigerant Charge Checked?

Refrigerant Charge Checked?
Outdoor Fan Checked?

Voltage With Compressor Operating

THERMOSTAT

Calibrated? _ Properly Set? _ Level?

505076M 0_07

Page 18