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

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INSTALLATION

2010 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.

Installation and service must be performed by a qualified installer or service agency.

CAUTION

Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Be aware of, and use caution when working near these areas during installation or while servicing this equipment.

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HFCs, and HCFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.

IMPORTANT

This unit must be matched with an indoor coil as specified in Lennox’ Engineering Handbook. Coils previously charged with HCFC−22 must be flushed.

INSTRUCTIONS

XP14 Elite® Series Units

HEAT PUMP UNITS

505,244M 03/10 Supersedes 10/09

Table of Contents

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 11. . . . . . . . . . . . . . . . . . . .

Manifold Gauge Set 12. . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Valves 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Leak Testing 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Evacuation 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start−Up 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Refrigerant Charge 14. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Indoor Airflow before Charging 14. . . . . . . . . . . .

Setup for Checking and Adding Charge 15. . . . . . . . . .

Weigh in Charge 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Subcooling Charge 15. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Defrost System 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

User Information 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start-up and Performance Checklist 26. . . . . . . . . . . . . .

XP14 Outdoor Unit

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 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.

Shipping and Packing List

1 − Assembled XP14 outdoor unit

Check the unit components for shipping damage. If you find any damage, immediately contact the last carrier.

Litho U.S.A.

03/10 505,244M

*2P0310* *P505244M*

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Page 2

Unit Dimensions − Inches (mm) and Parts Arrangement

RUN

CAPACITOR

DEFROST

BOARD

CONTACTOR

REVERSING

VALV E

FILTER DRIER/

LIQUID LINE

CONNECTIONS

TOP VIEW

DISCHARGE AIR

SUCTION LINE CONNECTION

LIQUID LINE CONNECTION

ELECTRICAL INLETS

VAPOR LINE CONNECTION

108)

4−3/4 (121)

4−1/4(

PARTS ARRANGEMENT

2 (51)

OUTDOOR FAN

COMPRESSOR

HIGH PRESSURE SWITCH

VAPOR LINE

VAPOR VALVE AND GAUGE PORT/SUCTION LINE CONNECTIONS

SIDE VIEW

UNIT SUPPORT FEET

8−1/2 (216)

8−3/4 (222)

5−1/2 (140)

13−1/2

(343)

XP14−018 TO −030 BASE SECTION

9−1/2 (241)

8−1/4 (210)

UNIT SUPPORT FEET

16−7/8

(429)

8−3/4 (222)

3−1/8

(79)

1 (25)

XP14−036 TO −060 BASE WITH

ELONGATED LEGS

Model No. A B C

XP14−018 31 (787) 27 (686) 28 (711)

XP14−024 31 (787) 27 (686) 28 (711)

XP14−030 35 (889) 27 (686) 28 (711)

XP14−036 31 (787) 35 1/2 (902) 39 1/2 (1003)

XP14−042 39 (991) 35 1/2 (902) 39 1/2 (1003)

XP14−048 39 (991) 35 1/2 (902) 39 1/2 (1003)

XP14−060 45 (1143) 35 1/2 (902) 39 1/2 (1003)

SIDE VIEW

30−3/4

(781)

26−7/8

(683)

3−3/4

(95)

4−5/8 (117)

505244M 10/09

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WARNING

Product contains fiberglass wool.

Disturbing the insulation of this product during installation, maintenance, or repair will expose you to fiberglass wool. Breathing this may cause lung cancer. (Fiberglass wool is know to the State of California to cause cancer.) Fiberglass wool may also cause respiratory, skin and eye irritation.

To reduce exposure to this substance or for further information, consult material safety data sheets available from address show below, or contact your supervisor.

Lennox Industries Inc., PO Box 79011, Dallas, TX 75379−9011

General Information

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.

See NOTES

See

NOTES

See NOTES

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.

See

NOTES

Control

Box

Setting the Unit

CAUTION

In order to avoid injury, take proper precaution when lifting heavy objects.

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

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.

BUILDING STRUCTURE

MOUNTING SLAB

GROUND LEVEL

Figure 2. Slab Mounting Options

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XP14 SERIES

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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

2" (50.8mm)

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 be threaded into the female threaded adaptors to make additional adjustments to the level of the unit.

TYPICAL INSTALLATION WITH 3 TO 4 IN. EXTENDERS INSTALLED

IMPORTANT!

ALWAYS USE STABILIZER BRACKET ON ELEVATED INSTALLATIONS

STABILIZER BRACKETS

GROUND LEVEL

BUILDING STRUCTURE

MOUNTING SLAB

Figure 5. Elevated Slab Mounting using Feet

Extenders

IMPORTANT

Unit Stabilizer Bracket Use (field−provided):

Always use stabilizers when unit is raised above the factory height. (Elevated units could become unstable in gusty wind conditions).

Stabilizers may be used on factory height units when mounted on unstable or uneven surface.

505244M 10/09

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With unit positioned at installation site, remove two side louvered 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.

#10 1/2" LONG SELF−DRILLING SHEET METAL SCREWS

STABILIZING BRACKET (18 GAUGE METAL − 2" WIDTH; HEIGHT AS REQ’D)

#10 1−1/4" LONG HEX HD SCREW & FLATWASHER

PLASTIC ANCHOR − USE IF CONCRETE (HOLE DRILL 1/4"); NOT IF PLASTIC SLAB (HOLE DRILL 1/8").

Deck Top Mounting

STABILIZING BRACKET (18 GAUGE METAL − 2" WIDTH; HEIGHT AS REQ’D); BEND TO FORM RIGHT ANGLE

MINIMUM 1 PER SIDE

FOR EXTRA STABILITY

COIL

BASE PAN

CORNER POST

Removing Panels

Remove the louvered 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

wind barrier

24"

inlet air

(610 mm)

inlet air

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 HOLES

LIP

Detail

ROTATE IN THIS DIRECTION; THEN DOWN TO REMOVE PANEL

inlet air

Figure 7. Rooftop Application with Wind Barrier

Detail C

Figure 8. Removing/Installing Louvered Panels

(Details A, B and C)

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XP14 SERIES

Page 6

MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT AS POSSIBLE) WHILE INSTALLING PANEL.

ANGLE MAY BE TOO EXTREME

PREFERRED ANGLE FOR INSTALLATION

HOLD DOOR FIRMLY TO THE HINGED

SIDE TO MAINTAIN

FULLY−ENGAGED TABS

Detail D

Figure 9. Removing/Installing Louvered Panels

(Detail D)

4. Units are approved for use only with copper conductors. (A complete unit wiring diagram is located inside the unit control box cover.)

WARNING! − ELECTRIC SHOCK HAZARD. Can cause INJURY or DEATH. Unit must be grounded in accordance with national and local codes.

NOTE − For use with copper conductors only. Refer to unit rating plate for minimum circuit ampacity and maximum overcurrent protection size.

CAUTION

To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:

While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).

While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause panels to be blown around and battered.

Electrical

In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC).

Refer to the furnace or blower coil installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size.

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

2. Ground the unit at the unit disconnect switch or to earth ground.

3. To facilitate conduit, a hole is provided in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting.

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

color−coded, temperature rating 35ºC minimum

5. Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area and 5 feet (1.5 m) from the floor. It should not be installed on an outside wall or where it can be affected by sunlight, drafts or vibrations.

6. Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit. See figures 11 and 12 on page 7.

NOTE − 24V, Class II circuit connections are made in the low voltage junction box.)

WARNING

Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes.

Line voltage is present at all components when unit is not in operation on units with single-pole contactors. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies.

505244M 10/09

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Thermostat Indoor Unit Outdoor Unit

24V power

common

1st-stage

auxiliary heat

indoor blower

reversing valve

compressor

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

24V power

common

1st-stage auxiliary heat

Thermostat Indoor Unit Outdoor Unit

24V power 24V power

common

emergency heat

1st-stage

auxiliary heat

indoor blower

reversing valve

compressor

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

common

1st-stage auxiliary heat

EMERGENCY

HEAT RELAY

OUTDOOR THERMOSTAT

Figure 11. Outdoor Unit and Blower Unit Thermostat

Designations

Figure 12. Outdoor Unit and Blower Unit Thermostat

Designations (with Emergency Heat Relay)

Figure 13. Typical XP14 Wiring

Page 7

XP14 SERIES

Page 8

Refrigerant Piping

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC’s, HFC’s, and HCFC’s) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.

If the XP14 unit is being installed with a new indoor coil and line set, the plumbing connections should be made as outlined in this section. If an existing line set and/or indoor coil is going to be used to complete the XP14 system, refer to the following section that includes flushing procedures.

Field refrigerant piping consists of liquid and vapor lines from the outdoor unit (sweat connections) to the indoor coil (flare or sweat connections). Use Lennox L15 (sweat, non-flare) series line sets as shown in table 3 or use field-fabricated refrigerant lines. Refer to Refrigerant Piping Guide (Corp. 9351−L9) for proper size, type, and application of field−fabricated lines. Valve sizes are also listed in table 3.

REFRIGERANT LINE CONNECTIONS − XP14 OUTDOOR UNIT MATCHED WITH NEW INDOOR COIL AND LINE SET

If replacing an existing coil equipped with a liquid line functioning as a metering orifice, replace the liquid line prior to installing the XP14 unit. Line sets are described in table 3.

Table 3. Refrigerant Line Sets

Valve Field

Model

−018

−024

−030

−036

−042

−048

−060

Connections

Liquid Line

3/8 in. (10 mm)

Vapor Line

3/4 in (19 mm)

7/8 in (22 mm)

1−1/8 in. (29 mm)

NOTE − When installing refrigerant lines, refer to Lennox Refrigerant Piping Guide (Corp. 9351−L9) or Lennox Technical Support Department Product Applications Group for assistance. In addition, be sure to consider the following points:

Recommended Line Set

Liquid Line

3/8 in. (10 mm)

Vapor Line

3/4 in (19 mm)

7/8 in (22 mm)

1−1/8 in. (29 mm)

L15 Line Sets

L15−41 15 ft. − 50 ft. (4.6 m − 15 m)

L15−65 15 ft. − 50 ft. (4.6 m − 15 m)

Field Fabricated

 Select line set diameters from table 3 to ensure that oil

returns to the compressor.

 Units are designed for line sets of up to 50 feet (15 m);

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

Two 90° elbows installed in line set 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 9 shows how to make a

transition from horizontal to vertical

505244M 10/09

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Page 9

TO HANG LINE SET FROM JOIST OR RAFTER, USE EITHER METAL STRAPPING MATERIAL OR ANCHORED HEAVY NYLON WIRE TIES.

STRAPPING MATERIAL

(AROUND SUCTION

LINE ONLY)

FLOOR JOIST OR

ROOF RAFTER

TAPE OR WIRE TIE

8 FEET

FLOOR JOIST OR

ROOF RAFTER

METAL

SLEEVE

STRAP THE SUCTION LINE TO THE JOIST OR RAFTER AT 8 FEET INTERVALS THEN STRAP THE LIQUID LINE TO THE SUCTION LINE.

8 FEET

Figure 15. Refrigerant Line Sets: Installing

Horizontal Runs

IMPORTANT - REFRIGERANT LINES MUST NOT CONTACT WALL.

OUTSIDE WALL

WOOD BLOCK

BETWEEN STUDS

SUCTION LINE

WIRE TIE (AROUND SUCTION LINE ONLY)

TAPE OR WIRE TIE

LIQUID LINE

WIRE TIE

INSIDE WALL

ANCHORED HEAVY

NYLON WIRE TIE

WALL STUD

METAL SLEEVE

AUTOMOTIVE

MUFFLER-TYPE HANGER

WALL

STUD

METAL SLEEVE

STRAP LIQUID LINE TO SUCTION LINE

LIQUID LINE

SUCTION LINE − WRAPPED IN ARMAFLEX

STRAP LIQUID LINE TO SUCTION LINE

LIQUID LINE

SUCTION LINE − WRAPPED IN ARMAFLEX

STRAP

NOTE − SIMILAR INSTALLATION PRACTICES SHOULD BE USED IF LINE SET IS TO BE INSTALLED ON EXTERIOR OF OUTSIDE WALL.

SUCTION LINE WRAPPED

WITH ARMAFLEX

OUTSIDE

WALL

PVC

PIPE

FIBERGLASS

INSULATION

LIQUID LINE

CAULK

SLEEVE

IMPORTANT! REFRIGERANT LINES MUST NOT CONTACT STRUCTURE.

SLEEVE

WIRE TIE

WOOD BLOCK

WIRE TIE

STRAP

Figure 16. Refrigerant Line Sets: Installing Vertical

Runs (New Construction Shown)

Figure 17. Refrigerant Line Sets: Transition from

Vertical to Horizontal

BRAZING CONNECTION PROCEDURE

WARNING

Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections.

1. Cut ends of the refrigerant lines square (free from nicks or dents). Debur the ends. The pipe must remain round; do not pinch end of the line.

2. Flow dry nitrogen through the refrigerant piping while making line set connections; this prevents carbon deposits (oxidation) buildup on the inside of the joints being brazed. Such buildup may restrict refrigerant flow through screens and metering devices. To do this:

 Flow regulated nitrogen (at 1 to 2 psig) through the

refrigeration gauge set into the Schrader port connection on the vapor service valve and out of the Schrader port connection on the liquid service valve. (Metering device (CTXV and RFC) will allow low pressure nitrogen to flow through the system.)

Page 9

XP14 SERIES

Page 10

 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.

NOTE − The tube end must stay bottomed in the fitting during final assembly to ensure proper seating, sealing and rigidity.

5. Install a field−provided check expansion valve (approved for use with HFC−410A refrigerant) in the liquid line at the indoor coil.

Flushing Existing Line Set and Indoor Coil

IMPORTANT

If this unit is being matched with an approved line set or indoor coil which was previously charged with HCFC−22 refrigerant, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps.

Polyol ester (POE) oils are used in Lennox units charged with HFC−410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the check expansion valve, reducing system performance and capacity.

Failure to properly flush the system per the instructions below will void the warranty.

WARNING

Danger of fire. Bleeding the refrigerant charge from only the high side may result in the low side shell and suction tubing being pressurized. Application of a brazing torch while pressurized may result in ignition of the refrigerant and oil mixture − check the high and low pressures before unbrazing.

CAUTION

This procedure should not be performed on systems which contain contaminants (Example: compressor burn out).

IMPORTANT

The line set and indoor coil must be flushed with at least the same amount of clean refrigerant that previously charged the system. Check the charge in the flushing cylinder before proceeding.

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 12).

FLUSHING PROCEDURE

1. Remove existing HCFC−22 refrigerant using the following, applicable procedure as illustrated in figure 18:

If the existing outdoor unit is not equipped with shut−off valves, or if the unit is not operational AND you plan to use the existing HCFC−22 refrigerant to flush the system −

 Disconnect all power to the existing outdoor unit.  Connect to the existing unit, a clean recovery

cylinder and the recovery machine according to the instructions provided with the recovery machine.

 Remove all HCFC−22 refrigerant from the existing

system. Check gauges after shutdown to confirm that the entire system is completely void of refrigerant.

 Disconnect the liquid and vapor lines from the

existing outdoor unit.

If the existing outdoor unit is equipped with manual shut−off valves AND you plan to use NEW HCFC−22 refrigerant to flush the system −

 Start the existing HCFC−22 system in the cooling

mode and close the liquid line valve.

 Pump all of the existing HCFC−22 refrigerant back

into the outdoor unit. (It may be necessary to bypass the low pressure switches to ensure complete refrigerant evacuation.)

 When the low side system pressures reach 0 psig,

close the vapor line valve.

 Disconnect all power to the existing outdoor unit.

Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.

 Disconnect the liquid and vapor lines from the

existing outdoor unit.

2. Remove the existing outdoor unit. Set the new HFC−410A unit and follow the Brazing Connection Procedure provided on page 9 to make line set connections. DO NOT install HFC−410A

check/expansion valve at this time.

3. 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.

505244M 10/09

Page 10

Page 11

INVERTED HCFC−22 CYLINDER CONTAINS CLEAN HCFC−22 TO BE USED FOR FLUSHING.

SUCTION LINE

SERVICE VALVE

EXISTING

INDOOR

UNIT

LIQUID LINE SERVICE VALVE

RECOVERY

CYLINDER

SUCTION

LIQUID

NEW

OUTDOOR

UNIT

LOW

OPENED

RECOVERY MACHINE

GAUGE

MANIFOLD

TANK RETURN

INLET

DISCHARGE

HIGH

CLOSED

A Inverted HCFC−22 cylinder with clean refrigerant to the

suction service valve.

B HCFC−22 gauge set (low side) to the liquid line valve. C HCFC−22 gauge set center port to inlet on the recovery

machine. with an empty recovery tank to the gauge set.

D Connect recovery tank to recovery machines per machine

instructions.

NOTE − The inverted HCFC−22 cylinder must contain at least the same amount of refrigerant as was recovered from the existing system.

Figure 18. Flushing Connections

4. 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.

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.

Refrigerant Metering Device

XP14 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.

(Uncased Coil Shown)

TWO PIECE PATCH PLATE (uncased coil only)

DISTRIBUTOR TUBES

ACCESS FITTING (no valve core)

On smaller lines, bulb may be mounted on top

Do not mount bulb on bottom of line

Figure 19. Metering Device Installation

Suction Line

ORIFICE HOUSING

EQUALIZER LINE

SENSING BULB (insulation required)

1/2" & smaller suction line

Bulb

5/8" & larger suction line

EXPANSION VALVE

(see note)

O−RING

STRAINER

Remove and discard SEAL ASSEMBLY (if applicable)

SUCTION LINE

NOTE − If necessary, remove HCFC−22 flow control device (fixed orifice/check expansion valve) from existing line set before installing HFC−410A approved expansion valve and o−ring.

SENSING LINE

LIQUID LINE

Page 11

XP14 SERIES

Page 12

CHECK

EXPANSION VALVE

LOW

PRESSURE

HUGH

BIFLOW FILTER / DRIER

MUFFLER

DISTRIBUTOR

OUTDOOR

COIL

OUTDOOR UNIT

REVERSING VALVE

NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW

INDOOR UNIT

GAUGE MANIFOLD

TO HFC−410 A DRUM

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.

LIQUID

LINE

SERVICE

PORT

COMPRESSOR

Figure 20. XP14 Cooling Cycle (Showing Gauge Manifold Connections)

2. Use a service wrench with a hex−head extension

IMPORTANT

Failure to remove a fixed orifice when installing an expansion valve on the indoor coil will result in improper operation and damage to the system.

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.

Manifold Gauge Set

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.

Service Valves

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.

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

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. Replace the stem cap. Tighten finger tight, then torque

Vapor Line Ball Valve

Ball-type service valves as illustrated in figure 22 function the same way as the other valves but cannot be rebuilt; if one fails, replace with a new valve. The ball valve is equipped with a service port with a factory−installed Schrader valve. A service port cap protects the Schrader valve from contamination and assures a leak−free seal.

VAPOR

VAPOR SERVICE PORT

VAPOR LINE VALV E

CHECK EXPANSION VALVE

SERVICE

PORT

INDOOR

COIL

(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.

per table 1 on page 3.

(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.

per table 1 on page 3.

STEM SCHRADER VALVE [OPEN TO LINE SET WHEN VALVE IS CLOSED (FRONT SEATED)]

TO OUTDOOR COIL

SERVICE PORT CAP

CAP

(VALVE FRONT-SEATED)

Valve in closed position Valve in open position

INSERT HEX WRENCH HERE

TO INDOOR COIL

Figure 21. Front-Seated Liquid Line Valve

505244M 10/09

Page 12

Page 13

STEM

USE ADJUSTABLE WRENCH

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

TO INDOO R COIL

CAP

STEM

SERVICE PORT

SCHRADER VALVE

TO OUTDOOR COIL

BALL (SHOWN CLOSED)

SERVICE PORT CAP

Figure 22. Ball−Type Vapor Valve (Valve Closed)

Leak Testing

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

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.

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

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 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.

WARNING

Fire, Explosion and Personal Safety Hazard.

Failure to follow this warning could result in damage, personal injury or death.

Never use oxygen to pressurize or purge refrigeration lines. Oxygen, when exposed to a spark or open flame, can cause damage by fire and/ or an explosion, that could result in personal injury or death.

WARNING

Danger of explosion!

When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to

13.8 kPa).

USING AN ELECTRONIC LEAK DETECTOR

IMPORTANT

Leak detector must be capable of sensing HFC refrigerant.

1. Connect a cylinder of HFC−410A to the center port of the manifold gauge set.

Evacuation

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

Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns. Use an instrument that reads from 50 microns to at least 23,000 microns.

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 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.

Page 13

XP14 SERIES

Page 14

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.

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.

IMPORTANT

WARNING

Danger of Equipment Damage! Avoid deep vacuum operation. Do not use compressors to evacuate a system. Extremely low vacuums can cause internal arcing and compressor failure. Damage caused by deep vacuum operation will void warranty.

7. Shut off the 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.

Start−Up

Mineral oils are not compatible with HFC−410A. If oil must be added, it must be a polyol ester oil.

Refrigerant Charge

This system is charged with HFC−410A refrigerant which operates at much higher pressures than HCFC−22. The recommended check expansion valve is approved for use with HFC−410A. Do not replace it with a valve that is designed to be used with HCFC−22. This unit is NOT approved for use with coils that include metering orifices or capillary tubes.

Units are factory-charged with the amount of HFC−410A refrigerant indicated on the unit rating plate. This charge is based on a matching indoor coil and outdoor coil with 15 ft. (4.6 m) line set. For varying lengths of line set, refer to table 3 for refrigerant charge adjustment. A blank space is provided on the unit rating plate to list the actual field charge.

Check Indoor Airflow before Charging

IMPORTANT

Check airflow before charging!

NOTE − Be sure that filters and indoor and outdoor coils are clean before testing.

IMPORTANT

If unit is equipped with crankcase heater, it should be energized 24 hours before unit start−up to prevent compressor damage as a result of slugging.

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 15 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.

505244M 10/09

Page 14

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 Volts x 3.41

1.08 x Temperature rise (F)

Page 15

Temp. of air entering indoor coil ºF

Wet−bulb ºF

53º

DRY

BULB

80 24 24 24 23 23 22 22 22 20 19 18 17 16 15 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12

Dry−bulb

72 20 20 19 18 17 17 16 15 15 14 13 12 11 10

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

57 58 59 60 61 62 63 64 65 66 67 68 69 70

Drop

19º

All temperatures are expressed in ºF

Figure 23. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart

air flowair flow

INDOOR COIL

Step 1. Determine the desired DTMeasure entering air tempera- ture using dry bulb (A) and wet bulb (B). DT is the intersecting value of

A and B in the table (see triangle).

Step 2. Find temperature drop across coilMeasure the coil’s dry

bulb entering and leaving air temperatures (A and C). Temperature Drop Formula: (T

Step 3. Determine if fan needs adjustmentIf the difference between the measured T

72º

64º

WET

BULB

DRY

BULB

+3º, no adjustment is needed. See examples: Assume DT = 15 and A temp. = 72º, these C temperatures would necessitate stated actions:

Cº T

Drop

53º 19 – 15 = 4 Increase the airflow 58º 14 – 15 = −1 (within +3º range) no change 62º 10 – 15 = −5 Decrease the airflow

Step 4. Adjust the fan 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 +3º.

) = A minus C.

Drop

and the desired DT (T

Drop

– DT = ºF ACTION

–DT) is within

Drop

Setup for Checking and Adding Charge

SETUP FOR CHARGING

Connect the manifold gauge set to the unit’s service ports (see figure 20):

 low pressure gauge to vapor service port

 high pressure gauge to liquid service port

Close manifold gauge set valves. Connect the center manifold hose to an upright cylinder of HFC−410A.

CALCULATING CHARGE

If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit. To calculate the total refrigerant charge:

Amount specified on nameplate

Adjust amt. for variation in line set length (table 4)

Additional charge specified per indoor unit match−up (table 5)

+ + =

Total charge

Weigh in Charge

1. Recover the refrigerant from the unit.

2. Conduct leak check; evacuate as previously outlined.

3. Weigh in the unit nameplate charge plus any charge required for line set differences from 15 feet and any extra indoor unit match−up amount per table 5. (If

weighing facilities are not available, use the subcooling method.)

Table 4. Charge per Line Set Lengths

Liquid Line Set Diameter

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.

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

Subcooling Charge

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 5 lists all the Lennox recommended indoor unit matches along with the charge levels for the various sizes of outdoor units.

Page 15

XP14 SERIES

Page 16

SATº LIQº – SCº =

Table 5. Adding Charge per Indoor Unit Match using Subcooling Method

Use cooling mode

60ºF (15ºC) Use heating mode

1 Check the airflow as illustrated in figure 23 on page 15 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

7, (Table 7 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 68ºF (20ºC). 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 77ºF (25ºC). When pressures have stabilized, continue with step 6.

6 Read the liquid line temperature; record in the LIQº space. 7 Read the liquid line pressure; then find its corresponding temperature in the temperature/ pressure

chart listed on page 18 and record it in the SATº space. 8 Subtract LIQº temp. from SATº temp. to determine subcooling; record it in SCº space.

9 Compare SCº results with table below, being sure to note any additional charge for line set and/or

match−up. 10 If subcooling value is greater than shown in table, remove refrigerant; if less than shown, add

refrigerant. 11 If refrigerant is added or removed, repeat steps 5 through 10 to verify charge.

505244M 10/09

Page 16

Page 17

Table 6. Air Handler/Coil Matchups and Target Subcooling

INDOOR MATCHUPS

Target

Subcooling

HeatingCooling

(+5ºF)(+1ºF)

*Add

charge

INDOOR MATCHUPS

XP14−018 lb oz XP14−030 (Continued) lb oz XP14−042 (Continued) lb oz

CBX27UH−018/024 13 7 0 8 CH33−42B 6 6 1 12 CR33−50/60C,−60D 26 6 0 4

CBX32MV−018/024 15 7 0 0 CR33−30/36A/B/C 30 8 0 8 CX34−62C, −62D 12 6 0 9

CBX40UHV−024 15 7 0 0 CX34−31A/B 11 6 1 6 CX34−49C 12 6 0 7

XP14−024 lb oz

CBX26UH−024 25 7 0 0

CX34−38A/B S/N# 6007 and

after

CX34−38A/B Before S/N#

6007

CBX27UH−018/024 15 8 1 2 CX34−43B/C 15 11 2 14 CBX26UH−048 8 7 1 9

CBX32M−018/024 16 8 0 14 XP14−036 lb oz CBX27UH−048 11 8 1 2

CBX32M−030 15 8 1 3 C33−44C 13 6 0 0 CBX32M−048, −060 11 8 1 2

CBX32MV−018/024 16 8 0 14 CBX26UH−036 26 5 0 0 CBX32MV−048 25 8 0 0

CBX32MV−024/030 15 8 1 2 CBX26UH−037 25 4 1 9 CBX32MV−060 11 8 1 2

CBX40UHV−024 16 8 0 14 CBX27UH−036 13 6 0 3 CBX40UHV−048 25 8 0 0

CBX40UHV−030 15 8 1 2 CBX32M−036 13 6 0 2 CBX40UHV−060 11 8 1 2

CH23−41 16 8 0 2 CBX32M−042 13 6 0 3 CBX32MV−068 10 7 1 12

CH33−25A 16 6 0 7 CBX32MV−036 13 6 0 3 CH23−68 20 9 2 9

CH33−42B 14 11 1 10 CBX32MV−048 11 8 2 5 CH33−50/60C 11 8 1 1

CH33−36A 16 8 1 0 CBX40UHV−036 13 6 0 3 CH33−62D 10 7 1 14

CH33−36C 16 8 0 4 CBX40UHV−042, −048 11 8 2 5 CH33−60D 11 8 0 0

CR33−30/36A/B/C 25 7 0 2 CH33−50/60C 11 8 2 5 CR33−50/60C 35 5 0 0

CX34−25A/B 16 8 0 14 CH33−44B 13 6 1 7 CR33−60D 37 6 0 0

CX34−31A/B 15 8 1 3 CH33−48B 13 6 1 8 CX34−62C, −62D 10 7 1 7

CX34−36A/B/C 16 8 1 8 CR33−50/60C 25 4 1 15 CX34−49D 11 8 0 14

CX34−38A/B S/N# 6007 and

after

CX34−38A/B before S/N#

6007

11 11 2 2 CR33−48B/C 25 5 0 9 CX34−60D 11 8 0 0

14 11 2 2 CX34−49C 13 6 2 4 XP14−060 lb oz

XP14−030 lb oz CX34−43B/C, −50/60C 13 6 1 8 CBX26UH−048 12 7 1 0

CH23−41 11 6 0 8

CH23−51 6 6 1 12

CX34−38A/B S/N# 6007 and

after

CX34−38A/B before S/N#

6007

CBX26UH−024 30 8 0 6 XP14−042 lb oz CBX32M−048, −060 12 5 0 0

CBX26UH−030 29 8 2 3 CH23−68 20 9 0 13 CBX32MV−048, −060 12 5 0 0

CBX27UH−030 11 6 2 4 CBX26UH−042 27 6 0 0 CBX40UHV−048, −060 12 5 0 0

CBX32M−030 11 6 1 6 CBX27UH−042 12 6 0 8 CBX32MV−068 12 7 1 0

CBX32M−036 11 6 2 4 CBX32M−048 12 6 0 7 CH23−68 12 5 0 0

CBX32MV−024/030 11 6 1 6 CBX32MV−048 12 6 0 8 CH33−50/60C 12 5 0 0

CBX32MV−036 15 7 3 0 CBX40UHV−042, −048 12 6 0 8 CH33−62D 12 5 0 0

CBX40UHV−024, −030 11 6 1 6 CH33−43 12 6 0 7 CX34−62C, −62D 12 7 1 0

CBX40UHV−036 15 7 3 0 CH33−62D 12 6 0 10

C33−44C 11 6 2 3 CH33−50/60C 12 6 0 7

CH33−36C 11 3 0 0 CH33−60D 12 6 0 4

Target

Subcooling

HeatingCooling

(+5ºF)(+1ºF)

*Add

charge

INDOOR MATCHUPS

Target

Subcooling

HeatingCooling

(+5ºF)(+1ºF)

*Add

charge

6 6 2 3 CX34−60D 12 6 0 4

11 6 2 3 XP14−048 lb oz

6 6 0 0 CBX26UH−060 14 4 0 0

13 6 0 0 CBX27UH−060 12 5 0 0

*Add charge = Extra matchup amount required in addition to charge indicated on Heat Pump nameplate (remember to also add any charge required for line set differences from 15 feet). SN indicates serial number.

Page 17

XP14 SERIES

Page 18

Table 7. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG* (Cooling)

XP14−018 XP14−024 XP14−030 XP14−036 XP14−042 XP14−048 XP14−060

5F (5C)**

Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid/ Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor

Heating

60 (15) 346 / 139 352 / 138 338 / 137 350 / 134 373 / 139 355 / 130 351 / 117

50 (10) 323 / 117 331 / 114 334 / 112 331 / 117 363 / 117 336 / 113 333 / 105

40 (4) 306 / 98 304 / 99 312 / 93 313 / 97 348 / 97 315 / 88 316 / 88

30 (−1) 278 / 84 299 / 80 302 / 74 298 / 83 336 / 74 296 / 72 308 / 70

20 (−7) 273 / 66 283 / 66 280 / 53 284 / 66 322 / 64 286 / 64 300 / 61

Cooling

65 (18) 226 / 140 233 / 137 238 / 138 220 / 138 223 / 125 231 / 136 243 / 136

70 (21) 244 / 141 252 / 138 263 / 139 236 / 140 241 / 130 248 / 139 263 / 137

75 (24) 263 / 142 271 / 140 279 / 139 256 / 141 261 / 134 271 / 140 282 / 138

80 (27) 283 / 143 292 / 141 299 / 140 276 / 142 282 / 138 291 / 142 306 / 139

85 (29) 302 / 144 314 / 142 324 / 141 298 / 143 302 / 139 312 / 143 327 / 140

90 (32) 328 / 145 338 / 143 340 / 142 321 / 144 326 / 140 335 / 144 351 / 141

95 (35) 351 / 146 361 / 145 375 / 145 344 / 144 349 / 141 359 / 145 376 / 142

100 (38) 376 / 147 387 / 146 397 / 145 369 / 146 374 / 142 384 / 146 401 / 143

105 (41) 402 / 148 412 / 147 424 / 147 394 / 147 399 / 143 411 / 148 426 / 145

110 (38) 430 / 149 441 / 148 454 / 150 421 / 148 428 / 145 439 / 149 452 / 146

115 (45) 465 / 150 471 / 151 485 / 150 449 / 149 455 / 146 468 / 150 484 / 148

*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.

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

505244M 10/09

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Page 19

Defrost System

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.

Note − Component Locations Vary by Board Manufacturer.

TEST PINS

DEFROST

TERMINATION

PIN SETTINGS

SENSOR PLUG IN

(COIL, AMBIENT,

& DISCHARGE

SENSORS)

DELAY

PINS

LOW AMBIENT THERMOSTAT PINS

DIAGNOSTIC LEDS

The control monitors ambient temperature, outdoor coil temperature, and total run time to determine when a defrost cycle is required. The coil temperature probe is designed with a spring clip to allow mounting to the outside coil tubing. The location of the coil sensor is important for proper defrost operation.

NOTE − The demand defrost board accurately measures the performance of the system as frost accumulates on the outdoor coil. This typically will translate into longer running time between defrost cycles as more frost accumulates on the outdoor coil before the board initiates defrost cycles.

SERVICE LIGHT OPERATION

The thermostat is not included with the unit and must be purchased separately. Some outdoor thermostats incorporate isolating contacts and an emergency heat function (which includes an amber indicating light). The service light thermostat will enable the emergency heat light function on the room thermostat.

EMERGENCY HEAT (AMBER LIGHT)

An emergency heat function is designed into some room thermostats. This feature is applicable when isolation of the outdoor unit is required, or when auxiliary electric heat is staged by outdoor thermostats. When the room thermostat is placed in the emergency heat position, the outdoor unit control circuit is isolated from power and field-provided relays bypass the outdoor thermostats. An amber indicating light simultaneously comes on to remind the homeowner that he is operating in the emergency heat mode.

Emergency heat is usually used during an outdoor unit shutdown, but it should also be used following a power outage if power has been off for over an hour and the outdoor temperature is below 50°F (10°C). System should be left in the emergency heat mode at least six hours to allow the crankcase heater sufficient time to prevent compressor slugging.

FILTER DRIER

The unit is equipped with a large−capacity biflow filter drier which keeps the system clean and dry. If replacement is necessary, order another of the same design and capacity. The replacement filter drier must be suitable for use with HFC−410A refrigerant.

DEFROST CONTROL BOARD

Figure 24 provides a basic illustration of the layout of the defrost control board. Table 9 provides information concerning pin−out and jumper configurations.

REVERSING

VALV E

PRESSURE

SWITCH CIRCUIT

CONNECTIONS

24V TERMINAL STRIP CONNECTIONS

Figure 24. Defrost Control Board

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 90°F (32°C).

Note: The Y1 input must be active (ON) and the O" 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 (LO PS − S87 and HI PS − S4) are factory−wired into the defrost board on the LO−PS and HI−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

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XP14 SERIES

Page 20

Table 9. Defrost Control Board Description

ID Description

O Out 24 VAC output connection for reversing valve

LO−PS Connection for low−pressure switch

Y2 24 VAC output for second stage compressor solenoid

Y1 24 VAC common output, switched for enabling compressor

contactor

HI−PS Connection for high−pressure switch

P1 Seven position square pin header. P1 provides selection of

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

P2 The following connections are provided in the seven posi-

tion P2 screw terminal block:

W1 24 VAC thermostat output for auxiliary heat op-

eration

C 24 VAC system common

L Service light thermostat connection

R 24 VAC system power input

Y2 24 VAC thermostat input for second stage com-

pressor operation

O 24 VAC thermostat input for reversing valve op-

eration

Y1 24 VAC thermostat input for first stage compres-

sor operation

P3 Five position square pin header. P3 provides selection of

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

plicable for two stage compressor operations only.

P4 Six position square pin header. P4 provides connections for

the temperature sensors:

COIL (P4−5) Ground connection for outdoor coil tem-

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

AMB (P4−3) Ground connection for outdoor ambient

temperature sensor. (P4−4) Connection for outdoor ambient temperature sensor.

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

ature sensor. (P4−2) Connection for discharge temperature sensor. Note: This is applicable for two stage

compressor operations only.

P5 Two position square pin header. P5 provides selection of

the 30−second compressor delay option.

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

tory test connections.

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 40

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.

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 30 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 45 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 sensor fault is detected, the board will not execute the TEST mode.

TerminationThe defrost cycle ends when the coil temperature exceeds the termination temperature or after 14 minutes of defrost operation. If the defrost is terminated by the 14−minute timer, another defrost cycle will be initiated after 30 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.

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Page 21

JUMPER

TEST

Placing the jumper on the field test pins (E33) allows the technician to:

 Clear short cycle lockout  Clear five−strike fault lockout  Cycle the unit in and out of defrost mode  Place the unit in defrost mode to clear the coil

When Y1 is energized and 24V power is being applied to the Control, a test cycle can be initiated by placing a jumper on the Control’s TEST pins for 2 to 5 seconds. If the jumper remains on the TEST pins for longer than five seconds, the Control will ignore the jumpered TEST pins and revert to normal operation.

The Control will initiate one test event each time a jumper is placed on the TEST pins. For each TEST the jumper must be removed for at least one second and then reapplied.

Y1 Active

DEMAND DEFROST CONTROL (UPPER LEFT−HAND CORNER)

Place a jumper on TEST pins for

longer than one second but less than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable. No other functions will be executed and unit will continue in the mode it was operating.

If in COOLING Mode

No further test mode operation will be executed until the jumper is removed from the TEST pins and reapplied.

Place a jumper on TEST pins for

more than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable.

ACTIVE

O Line Status

If in DEFROST Mode

The unit will terminate defrost and enter HEAT MODE uncalibrated with defrost timer set for 34 minute test.

INACTIVE

If in HEATING Mode

If no ambient or coil sensor exist, unit will go into DEFROST MODE.

If ambient or coil faults exist (open or shorted), unit will remain in HEAT MODE.

NOTE  Placing a jumper on the TEST pins will not bring the unit out of inactive mode. The only way manually activate the heat pump from an inactive mode is to cycle the 24VAC power to the Control.

If jumper on TEST pins remains in place for more than five seconds.

The unit will return to HEAT MODE un−calibrated with defrost timer set for 34 minutes.

Figure 25. Test Mode

Page 21

If jumper on TEST pins is removed before a maximum of five seconds.

The unit will remain in DEFROST MODE until termination on time or temperature.

XP14 SERIES

Page 22

DEFROST BOARD

DEFROST SENSOR HARNESS

AMBIENT SENSOR

Figure 26. Sensor Locations

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Page 23

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 Green

OFF OFF Power problem

Simultaneous SLOW Flash

Alternating SLOW Flash

Simultaneous FAST Flash

Alternating FAST Flash

ON ON Circuit Board Failure

DS1 Red

Condition/Code Possible Cause(s) Solution

Check control transformer power (24V).

If power is available to board and LED(s) do not light, replace board.

None required.

None required (Jumper TEST pins to override)

Normal operation

5−minute anti−short cycle delay

Ambient Sensor Problem

Coil Sensor Problem

No power (24V) to board terminals R and C or board failure.

Unit operating normally or in standby mode.

Initial power up, safety trip, end of room thermostat demand.

Sensor being detected open or shorted or out of temperature range. Board will revert to time/ temperature defrost operation. (System will still heat or cool).

Sensor being detected open or shorted or out of temperature range. Board will not perform demand or time/temperature defrost operation. (System will still heat or cool).

Indicates that board has internal component failure. Cycle 24 volt power to board. If code does not clear, replace board.

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

OFF

SLOW Flash

OFF ON

SLOW Flash

OFF High Pressure Fault

ON OFF

SLOW Flash

FAST Flash

Low Pressure Fault

Low Pressure LOCKOUT

High Pressure LOCKOUT

Discharge Line Temperature Fault

Discharge Line Temperature

LOCKOUT

Restricted air flow over indoor or outdoor coil.

Improper refrigerant charge in system.

Improper metering device installed or incorrect operation of metering device.

Incorrect or improper sensor location or connection to system.

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

Remove any blockages or restrictions from coils and/or fans. Check indoor and outdoor fan motor for proper current draws.

Check system charge using approach and subcooling temperatures.

Check system operating pressures and compare to unit charging charts.

Make sure all pressure switches and sensors have secure connections to system to prevent refrigerant leaks or errors in pressure and temperature measurements.

OFF

Fast Flash

OFF

Discharge Sensor Fault

Discharge Sensor

LOCKOUT

The XP14 series units does not use a defrost line sensor. However, a resistor is installed across pins P4−1 and P4−2. If the resistor is missing or damage then this fault code will be displayed.

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

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 27).

100

TEMPERATURE (ºF)

5750

7450

9275

11775

15425

19975

26200

34375

46275

62700

10000 30000 50000 70000 90000

RESISTANCE (OHMS)

85300

Figure 27. Ambient and Coil Sensors

Page 23

XP14 SERIES

Page 24

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.

Ambient SensorThe ambient sensor (shown in figure

26) 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 26) 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.

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

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

Maintenance

WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.

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.

User Information

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)

505244M 10/09

Page 24

Page 25

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

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.

IMPORTANT

Turn off electrical power to the unit at the disconnect switch before performing any maintenance. The unit may have multiple power supplies.

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

Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water. Prolonged exposure of the unit to treated water (i.e., sprinkler systems, soakers, waste water, etc.) will corrode the surface of steel and aluminum parts and diminish performance and longevity of the unit.

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.

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 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.

In 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.

Page 25

XP14 SERIES

Page 26

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

Start−Up and Performance Checklist

Job Name Job no. Date

Job Location City State

Installer City State

Unit Model No. Serial No. Service Technician

Nameplate Voltage

Rated Load Ampacity Compressor Amperage:

Maximum Fuse or Circuit Breaker

Electrical Connections Tight?  Indoor Filter clean?  Supply Voltage (Unit Off)

Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.

Vapor Pressure;

Refrigerant Lines: Leak Checked?  Properly Insulated?  Outdoor Fan Checked? 

Service Valves: Fully Opened?  Caps Tight?  Voltage With Compressor Operating

SEQUENCE OF OPERATION

Heating Correct?  Cooling Correct? 

Calibrated? 

THERMOSTAT

Properly Set?  Level? 

505244M 10/09

Page 26

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

Specifications and Main Features

Frequently Asked Questions

User Manual