Lennox XC17-030-230-01, XC17-024-230-01, XC17-024-230-02, XC17-024-230-03, XC17-030-230-02 Unit Information

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Page 1

2010 Lennox Industries Inc.

Revised August 2, 2010

XC17

Service Literature

Corp. 1022−L3

XC17 (HFC−410A) SERIES UNITS

NOTICE

A thermostat is not included and must be ordered separately.

D The Lennox icomfort Toucht thermostat must be used

in communicating applications.

D In non−communicating applications, the Lennox

ComfortSense

7000 thermostat may be used, as well

as other non−communicating thermostats.

In all cases, setup is critical to ensure proper system operation.

Field wiring examples for non−communicating applications begin on page 22.

See the icomfort Toucht thermostat Quick Start Guide for communicating and partial communicating field wiring connections.

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 licensed professional installer (or equivalent) or a service agency.

Accessories

For update−to−date information, see any of the following publications:

S Lennox XC17 Engineering Handbook S Lennox Product Catalog S Lennox Price Book

TABLE OF CONTENTS

Model Number Identification 2. . . . . . . . . . . . . . . . . . . .

Typical Serial Number Identification 2. . . . . . . . . . . . . .

Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Data 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unit Dimensions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Typical Unit Parts Arrangement 5. . . . . . . . . . . . . . . . .

Operating Gauge Set and Service Valves 6. . . . . . . . .

Unit Placement 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing and Installing Panels 11. . . . . . . . . . . . . . . . .

New or Replacement Line Set 12. . . . . . . . . . . . . . . . . .

Flushing the System 15. . . . . . . . . . . . . . . . . . . . . . . . . . .

Leak Testing the System 17. . . . . . . . . . . . . . . . . . . . . . .

Evacuating the System 19. . . . . . . . . . . . . . . . . . . . . . . . .

Electrical 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Field Control Wiring 22. . . . . . . . . . . . . . . . . . . . . . . . . . .

Air Conditioner Control (A175)

Jumpers

and Terminals 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unit Start−Up 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Refrigerant 27. . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating and Temperature Pressures 31. . . . . . . . . .

System Operations 32. . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Status, Fault and Lockout LED Codes 36. . . .

Component Field Configuration and

Troubleshooting 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Routine Maintenance 48. . . . . . . . . . . . . . . . . . . . . . . . . .

SunSource

Home Energy System 49. . . . . . . . . . . . . .

Start−Up and Performance Checklist 50. . . . . . . . . . . . .

Unit Wiring Diagrams 51. . . . . . . . . . . . . . . . . . . . . . . . . .

Unit Sequence of Operations 56. . . . . . . . . . . . . . . . . . .

The XC17 is a high efficiency residential split−system air conditioner unit, which features a one−stage scroll compressor, icomfortt control and HFC−410A refrigerant. Units are available in 2, 3, 4 and 5−ton sizes. This model series is designed for use with an expansion valve metering device only. Refer to the XC17 Engineering Handbook for ordering the correct indoor coil expansion valve.

This model is also SunSourcet ready beginning with XC17−XXX−230−02 build.

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XC17

Model Number Identification

C 17 036− −

Unit Type

C = Air Conditioner

Series

Nominal Cooling Capacity

024 = 2 tons 030 = 2.5 tons 036 = 3 tons 042 = 3.5 tons 048 = 4 tons 060 = 5 tons

Minor Revision Number

230

Voltage

230 = 208/230V−1ph−60hz

Refrigerant Type

X = R−410A

−3

Typical Serial Number Identification

8 09 C

Year Code

08 = 2008 09 = 2009 10 = 2010

Month Code

A = January B = February C = March

05716

5 (or 6) Digit Unique Number

Location Code

19 = Saltillo, Mexico

58 = Marshalltown, IA

Specifications

Model Number

Unit Outdoor Fan

Sound Rating Number

(dB)

Factory Refrigerant

Charge

Number of Blades Diameter − inches.

XC17−024−230−01 62 7 lbs. 14 oz. 5 26.2

XC17−024−230−02 62 7 lbs. 14 oz. 5 26.2

XC17−024−230−03 62 7 lbs. 14 oz. 5 26.2

Model Number

Unit Outdoor Fan

Sound Rating Number

(dB)

Factory Refrigerant

Charge

Number of Blades Diameter − inches.

XC17−030−230−01 63 8 lbs. 0 oz. 5 26.2

XC17−030−230−02 63 8 lbs. 0 oz. 5 26.2

XC17−030−230−03 63 8 lbs. 0 oz. 5 26.2

Model Number

Unit Outdoor Fan

Sound Rating Number

(dB)

Factory Refrigerant

Charge

Number of Blades Diameter − inches.

XC17−036−230−01 70 7 lbs. 12 oz. 5 26.2

XC17−036−230−02 70 7 lbs. 12 oz. 5 26.2

XC17−036−230−03 70 7 lbs. 12 oz. 5 26.2

Model Number

Unit Outdoor Fan

Sound Rating Number

(dB)

Factory Refrigerant

Charge

Number of Blades Diameter − inches.

XC17−042−230−01 70 7 lbs. 14 oz. 5 26.2

XC17−042−230−02 70 7 lbs. 14 oz. 5 26.2

XC17−042−230−03 70 7 lbs. 14 oz. 5 26.2

Model Number

Unit Outdoor Fan

Sound Rating Number

(dB)

Factory Refrigerant

Charge

Number of Blades Diameter − inches.

XC17−048−230−01 73 12 lbs. 12 oz. 5 26.2

XC17−048−230−02 73 12 lbs. 12 oz. 5 26.2

XC17−048−230−03 73 12 lbs. 12 oz. 5 26.2

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XC17

Model Number

Unit Outdoor Fan

Sound Rating Number

(dB)

Factory Refrigerant

Charge

Number of Blades Diameter − inches.

XC17−060−230−01 73 13 lbs. 4 oz. 5 26.2

XC17−060−230−02 73 13 lbs. 4 oz. 5 26.2

XC17−060−230−03 73 12 lbs. 14 oz. 5 26.2

Tested according to AHRI Standard 270−2008 test conditions.

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Electrical Data

208/230V−60 Hz−1 Ph

Model Number

Unit Compressor Condenser Fan

Maximum Over−

current Protection

(amps)

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

XC17−024−230−01 30 18.9 13.5 58.3 1/4 400 2.0

XC17−024−230−02 30 18.9 13.5 58.3 1/4 400 2.0

XC17−024−230−03 30 18.9 13.5 58.3 1/4 400 2.0

208/230V−60 Hz−1 Ph

Model Number

Unit Compressor Condenser Fan

Maximum Over−

current Protection

(amps)

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

XC17−030−230−01 30 18.0 12.8 64.0 1/4 450 2.0

XC17−030−230−02 30 18.0 12.8 64.0 1/4 450 2.0

XC17−030−230−03 30 18.0 12.8 64.0 1/4 450 2.0

208/230V−60 Hz−1 Ph

Model Number

Unit Compressor Condenser Fan

Maximum Over−

current Protection

(amps)

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

XC17−036−230−01 30 19.6 14.1 77.0 1/4 600 2.0

XC17−036−230−02 30 19.6 14.1 77.0 1/4 600 2.0

XC17−036−230−03 30 19.6 14.1 77.0 1/4 600 2.0

208/230V−60 Hz−1 Ph

Model Number

Unit Compressor Condenser Fan

Maximum Over−

current Protection

(amps)

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

XC17−042−230−01 40 24.4 17.9 107.0 1/4 600 2.0

XC17−042−230−02 40 24.4 17.9 107.0 1/4 600 2.0

XC17−042−230−03 40 24.4 17.9 107.0 1/4 600 2.0

208/230V−60 Hz−1 Ph

Model Number

Unit Compressor Condenser Fan

Maximum Over−

current Protection

(amps)

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

XC17−048−230−01 50 29.3 21.8 117.0 1/4 675 2.0

XC17−048−230−02 50 29.3 21.8 117.0 1/4 675 2.0

XC17−048−230−03 50 29.3 21.8 117.0 1/4 675 2.0

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XC17

208/230V−60 Hz−1 Ph

Model Number

Unit Compressor Condenser Fan

Maximum Over−

current Protection

(amps)

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

XC17−060−230−01 60 35.0 26.4 134.0 1/4 675 2.0

XC17−060−230−02 60 35.0 26.4 134.0 1/4 675 2.0

XC17−060−230−03 50 33.3 25.0 134.0 1/4 675 2.0

HACR type circuit breaker or fuse.

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Unit Dimensions − Inches (mm) and Parts Arrangement

4−5/8 (117)

39.40" (1003)

35.50" (902)

18.60" (470)

8.00" (203)

1 (25)

LIQUID LINE INLET

SUCTION LINE INLET

ELECTRICAL INLETS

BASE WITH ELONGATED LEGS

SIDE VIEW

ACCESS VIEW

DISCHARGE AIR

[−024] 41" (1040)

[−030 THROUGH

−060] 47" (1194)

16−7/8

(429)

8−3/4 (222)

26−7/8

(683)

3−3/4 (95)

30−3/4

(781)

3−1/8

(79)

UNIT SUPPORT

FEET

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XC17

Typical Unit Parts Arrangement

LIQUID LINE FILTER

DRIER (SINGLE FLOW)

FIELD CONNECTION

FOR LIQUID LINE

SET

LIQUID LINE SER-

VICE VALVE

LIQUID LINE SER-

VICE VALVE PORT

SUCTION LINE SERVICE

VALVE PORT

SUCTION LINE SERVICE

VALV E

FIELD CONNECTION

FOR SUCTION LINE

MUFFLER

HIGH DISCHARGE LINE TEMPERATURE

SENSOR (RT28)

LOW PRESSURE

SWITCH (S87)

HIGH PRESSURE SWITCH (S4)

CRANKCASE THERMOSTAT (S40)

COMPRESSOR

HARNESS

SR1 SOUND DOME

VIBRATION ISOLATOR SLEEVE LOCATIONS (DO NOT REMOVE)

GROUND LUG

HIGH VOLTAGE FIELD

CONNECTIONS

CONTACTOR−1POLE (K1−1)

AIR CONDITIONER

CONTROL (A175)

CAPACITOR (C12)

CONTROL BOX

SLEEVE

WIRE TIE

OUTDOOR AMBIENT

TEMPERATURE SENSOR (RT13)

FAN MOTOR CONTROL (A177)

SECOND GROUND LUG FOR SOURCESOURCEt

EXTERNAL SURGE

PROTECTION USED ON

XC17−XXX−230−01 AND −02

ONLY). LATER VERSIONS INCORPORATE FEATURE

INTO FAN MOTOR.

Figure 1. Typical Parts Arrangement

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XC17

WARNING

This product and/or the indoor unit it is matched with may contain fiberglass wool.

Disturbing the insulation during installation, maintenance, or repair will expose you to fiberglass wool dust. Breathing this may cause lung cancer. (Fiberglass wool is known 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 shown below, or contact your supervisor.

Lennox Industries Inc. P.O. Box 799900 Dallas, TX 75379−9900

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.

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 nearby these areas during installation or while servicing this equipment.

IMPORTANT

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

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.

Operating Gauge Set and Service Valves

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation.

TORQUE REQUIREMENTS

When servicing or repairing heating, ventilating, and air conditioning components, ensure the fasteners are appropriately tightened. Table 1 shows torque values for fasteners.

IMPORTANT

Only use Allen wrenches of sufficient hardness (50Rc − Rockwell Harness Scale minimum). Fully insert the wrench into the valve stem recess.

Service valve stems are factory−torqued (from 9 ft−lbs for small valves, to 25 ft−lbs for large valves) to prevent refrigerant loss during shipping and handling. Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench, or stripping the valve stem recess.

See the Lennox Service and Application Notes #C−08−1 for further details and information.

IMPORTANT

To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted snugly over the cap before tightening.

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

USING MANIFOLD GAUGE SET

When checking the system charge, only use a manifold gauge set that features low loss anti−blow back fittings.

Manifold gauge set used with HFC−410A refrigerant systems must be capable of handling the higher system operating pressures. The gauges should be rated for use with pressures of 0 − 800 psig on the high side and a low side of 30" vacuum to 250 psig with dampened speed to 500 psi. Gauge hoses must be rated for use at up to 800 psig of pressure with a 4000 psig burst rating.

OPERATING SERVICE VALVES

The liquid and vapor line service valves are used for removing refrigerant, flushing, leak testing, evacuating, checking charge and charging.

Each valve is equipped with a service port which has a factory−installed valve stem.

Figure 2 provides information

on how to access and operating both angle and ball service valves.

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XC17

(VALVE STEM SHOWN CLOSED) INSERT HEX WRENCH HERE

SERVICE PORT CORE

SERVICE PORT CAP

ANGLE−TYPE SERVICE

VALVE (FRONT−SEATED

CLOSED)

SERVICE PORT

CORE

TO OUTDOOR UNIT

STEM CAP

(VALVE STEM SHOWN OPEN) INSERT HEX WRENCH HERE

TO INDOOR

UNIT

ANGLE−TYPE SERVICE VALVE

(BACK−SEATED OPENED)

BALL (SHOWN CLOSED)

SERVICE PORT

CORE

TO INDOOR UNIT

TO OUTDOOR

UNIT

TO OPEN ROTATE STEM COUNTERCLOCKWISE 90°.

TO CLOSE ROTATE STEM CLOCKWISE 90°.

SERVICE PORT

CAP

STEM CAP

VALV E STEM

SERVICE VALVES

ANGLE AND BALL

Operating Angle Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use a service wrench with a hex−head extension (3/16" for liquid line valve sizes and 5/16" for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.

Operating Ball Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use an appropriately sized wrenched to open. To open valve, roate stem counterclockwise 90°. To close rotate stem clockwise 90°.

1/12 TURN

To Access Service Port:

A service port cap protects the service port core from contamination and serves as the primary leak seal.

1. Remove service port cap with an appropriately sized wrench.

2. Connect gauge set to service port.

3. When testing is completed, replace service port cap and tighten as follows:

S With torque wrench: Finger tighten and torque

cap per table 1.

S Without torque wrench: Finger tighten and

use an appropriately sized wrench to turn an additional 1/6 turn clockwise.

1/6 TURN

WHEN SERVICE VALV E IS CLOSED, THE SERVICE PORT IS OPEN

TO THE LINE SET AND INDOOR UNIT.

When service valve is OPEN, the service port is open to linE set, indoor and outdoor unit.

Reinstall Stem Cap:

Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows:

S With Torque Wrench: Finger tighten and

then torque cap per table 1.

S Without Torque Wrench: Finger tighten

and use an appropriately sized wrench to turn an additional 1/12 turn clockwise.

NOTE  A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.

Figure 2. Angle and Ball Service Valves

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XC17

CONTROL PANEL

ACCESS

LOCATION

6 (152)

36 (914)

12 (305)

30 (762)

LINE SET CONNECTIONS

24 (610)

LINE SET

CONNECTIONS

ACCESS PANEL

REAR VIEW OF UNIT

48 (1219)

MINIMUM CLEARANCE BETWEEN

TWO UNITS

CLEARANCE ON ALL SIDES  INCHES (MILLIMETERS)

ACCESS PANEL

MINIMUM CLEARANCE

ABOVE UNIT

NOTES:

1. CLEARANCE TO ONE OF THE OTHER THREE SIDES MUST BE 36 INCHES (914MM).

2. CLEARANCE TO ONE OF THE REMAINING TWO SIDES MAY BE 12 INCHES (305MM) AND THE FINAL SIDE MAY BE 6 INCHES (152MM).

Figure 3. Installation Clearances

Unit Placement

CAUTION

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

See Unit Dimensions on page 3 for sizing mounting slab, platforms or supports. Refer to figure 3 for mandatory installation clearance requirements.

POSITIONING CONSIDERATIONS

Consider the following when positioning the unit:

S Some localities are adopting sound ordinances based on

the unit’s sound level registered from the adjacent property, not from the installation property. Install the unit as far as possible from the property line.

S When possible, do not install the unit directly outside a

window. Glass has a very high level of sound transmission. For proper placement of unit in relation to a window see the provided illustration in figure 4, detail A.

PLACING UNIT ON SLAB

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 as described in figure 4, detail B.

NOTE  If necessary for stability, anchor unit to slab as described in figure 5, detail D.

ELEVATING THE UNIT

Units are outfitted with elongated support feet as illustrated in figure 5, detail C.

If additional elevation is necessary, raise the unit by extending the height of the unit support feet. This may be achieved by using a 2 inch (50.8mm) Schedule 40 female threaded adapter.

The specified coupling will fit snuggly into the recessed portion of the feet. Use additional 2 inch (50.8mm) Schedule 40 male threaded adaptors which can be threaded into the female threaded adaptors to make additional adjustments to the level of the unit.

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

Page 9

XC17

STABILIZING UNIT ON UNEVEN SURFACES

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 an uneven surface.

With unit positioned at installation site, perform the following

1. Remove two side louvered panels to expose the unit base.

2. Install the brackets as illustrated in figure 5, detail D using conventional practices.

3. Replace the panels after installation is complete.

ROOF MOUNTING

Install the unit a minimum of 6 inches (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.

NOTICE

Roof Damage!

This system contains both refrigerant and oil. Some rubber roofing material may absorbed oil and cause the rubber to swell when it comes into contact with oil. The rubber will then bubble and could cause leaks. Protect the roof surface to avoid exposure to refrigerant and oil during service and installation. Failure to follow this notice could result in damage to roof surface.

TWO 90° ELBOWS INSTALLED IN LINE SET WILL

REDUCE LINE SET VIBRATION.

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.

MOUNTING SLAB

BUILDING

STRUCTURE

GROUND LEVEL

Outside Unit Placement

Slab Mounting at Ground Level

INSTALL UNIT AWAY FROM WINDOWS

DETAIL A

DETAIL B

Figure 4. Placement, Slab Mounting and Stabilizing Unit

Page 10

XC17

LEG DETAIL

BASE

2" (50.8MM) SCH 40

FEMALE THREADED

ADAPTER

ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY, TWO BRACKETS PER SIDE, 2" (50.8MM) FROM EACH CORNER.

CONCRETE SLAB  USE TWO PLASTIC ANCHORS (HOLE DRILL 1/4")

COIL

BASE PAN

CORNER POST

STABILIZING BRACKET (18 GAUGE

METAL  2" WIDTH; HEIGHT AS

REQUIRED)

Slab Side Mounting

#10 1/2" LONG SELF−DRILLING

SHEET METAL SCREWS

#10 1−1/4" LONG HEX HD SCREW

AND FLAT WASHER

MINIMUM ONE

PER SIDE

FOR EXTRA

STABILITY

Elevated Slab Mounting using Feet

Extenders

Stabilizing Unit on Uneven Surfaces

WOOD OR PLASTIC SLAB  NO PLASTIC ANCHOR

(HOLE DRILL 1/8")

SAME FASTENERS AS SLAB SIDE MOUNTING.

IMPORTANT  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.

DETAIL C

DETAIL D

2" (50.8MM) SCH 40

MALE THREADED

ADAPTER

Use additional 2" SCH 40 male threaded adapters which can be threaded into the female threaded adapters to make additional adjustments to the level of the unit.

STABILIZING BRACKET (18 GAUGE METAL  2" (50.8MM) WIDTH; HEIGHT AS REQUIRED); BEND TO FORM RIGHT ANGLE

Deck Top Mounting

Figure 5. Placement, Slab Mounting and Stabilizing Unit

Page 11

XC17

Removing and Installing Panels

REMOVE 4 SCREWS TO REMOVE PANEL FOR ACCESSING COMPRESSOR AND CONTROLS.

POSITION PANEL WITH HOLES ALIGNED; INSTALL SCREWS AND TIGHTEN.

ACCESS PANEL REMOVAL

Removal and reinstallation of the access panel is as illustrated.

Detail A

Detail C

Detail B

ROTATE IN THIS DIRECTION; THEN

DOWN TO REMOVE PANEL

SCREW

HOLES

LIP

PANEL SHOWN SLIGHTLY ROTATED TO ALLOW TOP TAB TO EXIT (OR ENTER) TOP SLOT FOR REMOVING (OR INSTALLING) PANEL.

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

PREFERRED ANGLE FOR INSTALLATION

Detail D

ANGLE MAY BE TOO EXTREME

HOLD DOOR FIRMLY

ALONG THE HINGED SIDE

TO MAINTAIN FULLY−EN-

GAGED TABS

LOUVERED PANEL REMOVAL

Remove the louvered panels as follows:

1. Remove two screws, allowing the panel to swing open slightly.

2. Hold the panel firmly throughout this procedure. Rotate bottom corner of panel

away from hinged corner post until lower three tabs clear the slots as illustrated in detail B.

3. Move panel down until lip of upper tab clears the top slot in corner post as illus-

trated in detail A.

LOUVERED PANEL INSTALLATION

Position the panel almost parallel with the unit as illustrated in detail D with the screw side as close to the unit as possible. Then, in a continuous motion:

1. Slightly rotate and guide the lip of top tab inward as illustrated in detail A and C;

then upward into the top slot of the hinge corner post.

2. Rotate panel to vertical to fully engage all tabs.

3. Holding the panel’s hinged side firmly in place, close the right−hand side of the panel, aligning the screw holes.

4. When panel is correctly positioned and aligned, insert the screws and tighten.

PANELS

ACCESS AND LOUVERED

IMPORTANT  Do not allow panels to hang on unit by top tab. Tab is for align-

ment and not designed to support weight of panel.

IMPORTANT  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.

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.

WARNING

Page 12

XC17

New or Replacement Line Set

REFRIGERANT LINE SET

This section provides information on installation or replacement of existing line set. If new or replacement line set is not being installed then proceed to Brazing Connections on page 14.

IMPORTANT

Lennox highly recommends changing line set when converting the existing system from HCFC−22 to HFC−410A. If that is not possible and the line set is the proper size as reference in table 2, use the procedure outlined under Flushing the System on page 13.

If refrigerant lines are routed through a wall, then seal and isolate the opening so vibration is not transmitted to the building. Pay close attention to line set isolation during installation of any HVAC system. When properly isolated from building structures (walls, ceilings. floors), the refrigerant lines will not create unnecessary vibration and subsequent sounds. See figure 6 for recommended installation practices. Also, consider the following when placing and installing a high−efficiency outdoor unit.

Liquid lines that meter the refrigerant, such as RFC1 liquid lines, must not be used in this application. Existing line set of proper size as listed in table 2 may be reused. If system was previously charged with HCFC−22 refrigerant, then existing line set must be flushed (see Flushing the System on page 15).

Field refrigerant piping consists of liquid and vapor lines from the outdoor unit to the indoor unit coil (braze connections).

Table 2. Refrigerant Line Set Requirements

Model

Size

Field

Connections

Recommended Line Set

Liquid

Line

Vapor

Line

Liquid

Line

Vapor

Line

L15

Line Sets

Feet (Meters)

−024

3/8 (10)

3/4 (19)

3/8 (10)

3/4 (19)

L15−41

15 − 50’ (5 − 15)

−030

−036

3/8 (10)

7/8 (22)

3/8 (10)

7/8 (22)

L15−65

15 − 50’ (5 − 15)

−042

3/8 (10)

7/8 (22)

3/8 (10)

7/8 (22)

−048

−060

3/8 (10)

1−1/8.

(29)

3/8 (10)

1−1/8

(29)

Field Fabricated

NOTE  Some applications may required a field provided 7/8" to 1−1/8" adapter

NOTE  When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, CORP. 9351−L9, or contact Lennox Technical Support Product Applications for assistance.

To obtain the correct information from Lennox, be sure to communicate the following information:

S Model (XC17) and size of unit (e.g. −036).

S Line set diameters for the unit being installed as listed in

table 2 and total length of installation.

S Number of elbows vertical rise or drop in the piping.

IMPORTANT

Mineral oils are not compatible with HFC−410A. If oil must

be added, it must be a Polyol ester oil.

The compressor is charged with sufficient Polyol ester oil for line set lengths up to 50 feet. Recommend adding oil to system based on the amount of refrigerant charge in the system. No need to add oil in system with 20 pounds of refrigerant or less. For systems over 20 pounds − add one ounce of every five pounds of refrigerant.

Recommended topping−off POE oils are Mobil EAL ARCTIC 22 CC or ICI EMKARATEt RL32CF.

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.

WARNING

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).

CAUTION

Brazing alloys and flux contain materials which are hazardous to your health.

Avoid breathing vapors or fumes from brazing operations. Perform operations only in well ventilated areas.

Wear gloves and protective goggles or face shield to protect against burns.

Wash hands with soap and water after handling brazing alloys and flux.

Page 13

XC17

ANCHORED HEAVY NYLON WIRE TIE OR AUTOMOTIVE

MUFFLER-TYPE HANGER

STRAP LIQUID LINE TO VAPOR LINE

WALL STUD

LIQUID LINE

NON−CORROSIVE

METAL SLEEVE

VAPOR LINE − WRAPPED IN ARMAFLEX

AUTOMOTIVE

MUFFLER-TYPE HANGER

REFRIGERANT LINE SET  TRANSITION

FROM VERTICAL TO HORIZONTAL

Line Set Isolation  The following illustrations are

examples of proper refrigerant line set isolation:

STRAPPING

MATERIAL (AROUND

VAPOR LINE ONLY)

TAPE OR WIRE TIE

WIRE TIE (AROUND VAPOR LINE ONLY)

FLOOR JOIST OR

ROOF RAFTER

TAPE OR WIRE TIE

To hang line set from joist or rafter, use either metal strapping material or anchored heavy nylon wire ties.

8 FEET (2.43 METERS)

STRAP THE VAPOR LINE TO THE JOIST OR RAFTER AT 8 FEET (2.43 METERS) INTERVALS THEN STRAP THE LIQUID LINE TO THE VAPOR LINE.

FLOOR JOIST OR

ROOF RAFTER

REFRIGERANT LINE SET  INSTALLING

HORIZONTAL RUNS

NOTE  Similar installation practices should be used if line set is to be installed on exterior of outside wall.

PVC

PIPE

FIBERGLASS

INSULATION

CAULK

OUTSIDE

WALL

VAPOR LINE WRAPPED

WITH ARMAFLEX

LIQUID LINE

OUTSIDE WALL

LIQUID LINE

VAPOR LINE

WOOD BLOCK

BETWEEN STUDS

STRAP

WOOD BLOCK

STRAP

SLEEVE

WIRE TIE

INSIDE WALL

REFRIGERANT LINE SET  INSTALLING

VERTICAL RUNS (NEW CONSTRUCTION SHOWN)

INSTALLATION

LINE SET

NOTE  Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature of the liquid line or when pressure drop is equal to or greater than 20 psig.

NON−CORROSIVE METAL SLEEVE

IMPORTANT  Refrigerant lines must not contact structure.

NON−CORROSIVE METAL SLEEVE

8 FEET (2.43 METERS)

IMPORTANT  Refrigerant lines must not contact wall

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.

Figure 6. Line Set Installation

Page 14

XC17

CUT AND DEBUR

CAP AND CORE REMOVAL

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

Remove service cap and core from both the vapor and liquid line service ports.

ATTACHED GAUGES

OUTDOOR

UNIT

LIQUID LINE

VAPOR LINE

LIQUID LINE SERVICE

VALV E

VAPOR LINE

SERVICE

VALV E

ATTACH

GAUGES

INDOOR

UNIT

SERVICE PORT MUST BE OPEN TO ALLOW EXIT

POINT FOR NITROGEN

A Connect gauge set low pressure side to liquid line service

valve.

B Connect gauge set center port to bottle of nitrogen with

regulator.

NITROGEN

HIGHLOW

USE REGULATOR TO

FLOW NITROGEN AT 1

TO 2 PSIG.

WRAP SERVICE VALVE

FLOW NITROGEN

To protect components during brazing, wrap a wet cloth around the liquid line service valve body and copper tube stub and use another wet cloth underneath the valve body to protect the base paint.

Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid line service valve and out of the valve stem port connection on the vapor service valve.

NOTE  The fixed orifice or check expansion valve metering device at the indoor unit will allow low pressure nitrogen to flow through the system.

NITROGEN

HIGH

LOW

USE REGULATOR TO

FLOW NITROGEN AT 1

TO 2 PSIG.

BRAZE LINE SET

INSTALL SERVICE PORT CAPS ONLY

Braze the liquid line to the liquid line service valve. Turn off nitrogen flow.

After all connections have been brazed, disconnect manifold gauge set from service ports, cool down piping with wet rag and remove all wrappings. Do not reinstall cores until after evacuation procedure. Reinstall service port caps if desired to close off refrigerant ports.

IMPORTANT  Connect gauge set low pressure side to vapor line service valve and repeat procedure starting at paragraph 4 for brazing the liquid line to service port valve.

SERVICE PORT CORE

SERVICE PORT CAP

SERVICE PORT

WARNING  Allow braze joint to cool before removing the wet rag from the service valve. (TEMPERATURES ABOVE 250ºF CAN DAMAGE VALVE SEALS

CONNECTIONS

BRAZING

POINT FLAME AWAY FROM

SERVICE VALVE

NOTE − Use silver alloy brazing rods with five or six percent minimum silver alloy for copper−to−copper brazing, 45 percent alloy for copper−to−brass and copper−to−steel brazing.

Page 15

XC17

Flushing the System

SENSING

LINE

TEFLON RING

FIXED ORIFICE

(Uncased Coil Shown)

BRASS NUT

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

LIQUID LINE ORIFICE HOUSING

DISTRIBUTOR TUBES

DISTRIBUTOR

ASSEMBLY

REMOVE AND DISCARD

WHITE TEFLON SEAL (IF

PRESENT)

A On fully cased coils, remove the coil access and plumbing panels. B Remove any shipping clamps holding the liquid line and distributor

assembly.

C Using two wrenches, disconnect liquid line from liquid line orifice

housing. Take care not to twist or damage distributor tubes during this process.

D Remove and discard fixed orifice, valve stem assembly if present

and Teflon washer as illustrated above.

E Use a field−provided fitting to temporary reconnect the liquid line to

the indoor unit’s liquid line orifice housing.

TYPICAL FIXED ORIFICE REMOVAL PROCE-

DURE

TYPICAL CHECK EXPANSION

VALVE REMOVAL PROCEDURE

TWO PIECE PATCH PLATE

(UNCASED COIL ONLY)

VAPOR

LINE

DISTRIBUTOR

ASSEMBLY

DISTRIBUTOR

TUBES

LIQUID

LINE

MALE EQUALIZER

LINE FITTING

EQUALIZER LINE

CHECK

EXPANSION

VALV E

TEFLON RING

(Uncased Coil Shown)

STUB END

TEFLON

RING

SENSING BULB

LIQUID LINE

ORIFICE

HOUSING

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

A On fully cased coils, remove the coil access and plumbing panels. B Remove any shipping clamps holding the liquid line and distributor

assembly.

C Disconnect the equalizer line from the check expansion valve

equalizer line fitting on the vapor line.

D Remove the vapor line sensing bulb. E Disconnect the liquid line from the check expansion valve at the liquid

line assembly.

F Disconnect the check expansion valve from the liquid line orifice

housing. Take care not to twist or damage distributor tubes during this process.

G Remove and discard check expansion valve and the two Teflon rings. H Use a field−provided fitting to temporary reconnect the liquid line to

the indoor unit’s liquid line orifice housing.

LOW

HIGH

EXISTING

INDOOR

UNIT

GAUGE

MANIFOLD

INV ERTED HCFC−22 CYLINDER CONTAINS CLE AN HCFC−22 TO BE USED FOR FLUSHING.

LIQUID LINE SERVICE

VALV E

INLET

DISCHARGE

TANK RETURN

CLOSED

OPENED

RECOVERY

CYLINDER

RECOVERY MACHINE

NEW

OUTDOOR

UNIT

VAPOR LINE

SERVICE VALVE

VAPOR

LIQUID

A Inverted HCFC−22 cylinder with clean refrigerant to the vapor

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.

CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE

FLUSHING LINE SET

A 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 unit coil.

B 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 unit coil before it enters the recovery machine.

C 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 down to 0 the system.

D 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.

The line set and indoor unit 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.

LINE SET AND INDOOR COIL (1 OF 2)

FLUSHING

CAUTION This procedure should not be performed on sys-

tems which contain contaminants (Example compressor burn out.

Page 16

XC17

A Attach the vapor line sensing bulb in the proper orientation

as illustrated to the right using the clamp and screws provided.

NOTE  Confirm proper thermal contact between vapor line and check expansion bulb before insulating the sensing bulb once installed.

B Connect the equalizer line from the

check expansion valve to the equalizer vapor port on the vapor line. Finger tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated below.

The check expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed in a field−provided plenum, install the check expansion valve in a manner that will provide access for field servicing of the check expansion valve. Refer to below illustration for reference during installation of check expansion valve unit.

TYPICAL CHECK EXPANSION VALVE INSTALLATION PROCEDURE

TWO PIECE

PATCH PLATE

(UNCASED

COIL ONLY)

VAPOR

LINE

LIQUID LINE

ORIFICE

HOUSING

DISTRIBUTOR

TUBES

LIQUID LINE

MALE EQUALIZER LINE

FITTING (SEE

EQUALIZER LINE

INSTALLATION FOR

FURTHER DETAILS)

SENSING

LINE

EQUALIZER LINE

CHECK

EXPANSION

VALV E

TEFLON RING

(Uncased Coil Shown)

SENSING BULB INSULATION IS REQUIRED IF MOUNTED EXTERNAL TO THE COIL CASING. SENSING BULB INSTALLATION FOR BULB POSITIONING.

STUB

END

TEFLON

RING

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

DISTRIBUTOR

ASSEMBLY

This outdoor unit is designed for use in systems that use check expansion valve metering device. See the Lennox XC17 Engineering Hand- book for approved check expansion valve kit match−ups and application information.

A Remove the field−provided fitting that temporary reconnected the liq-

uid line to the indoor unit’s distributor assembly.

B Install one of the provided Teflon rings around the stubbed end of the

check expansion valve and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil.

C Attach the stubbed end of the check expansion valve to the liquid line

orifice housing. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above, or 20 ft−lb.

D Place the remaining Teflon washer around the other end of the check

expansion valve. Lightly lubricate connector threads and expose surface of the Teflon ring with refrigerant oil.

E Attach the liquid line assembly to the check expansion valve. Finger

tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above or 20 ft−lb.

ON 7/8" AND LARGER LINES, MOUNT SENSING BULB AT EITHER THE 4 OR 8 O’CLOCK POSITION. NEVER MOUNT ON BOTTOM OF LINE.

ON LINES SMALLER THAN 7/8", MOUNT SENSING BULB AT EITHER THE 3 OR 9 O’CLOCK POSITION.

BULB

VAPOR LINE

NOTE  NEVER MOUNT ON BOTTOM OF LINE.

BULB

VAPOR LINE

FLARE NUT

COPPER FLARE SEAL BONNET

MALE BRASS EQUALIZER LINE FITTING

FLARE SEAL CAP

1/2 TURN

SENSING BULB INSTALLATION

EQUALIZER LINE INSTALLATION

1/8 TURN

FLUSHING LINE SET AND INDOOR COIL (2 OF 2)

A Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right.

B Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right.

Page 17

XC17

INSTALLING ISOLATION GROMMETS

Locate the isolation grommets (provided). Slide grommets onto vapor and liquid lines. Insert grommets into piping panel to isolate refrigerant lines from sheet metal edges.

TWO ISOLATION GROMMETS ARE PROVIDE FOR THE LIQUID AND SUCTION LINE PIPE PANEL PASS THROUGH.

LIQUID LINE

SUCTION LINE

REAR VIEW OF UNIT EXTERIOR

PIPING PANEL

Figure 7. Isolation Grommets

IMPORTANT

The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants during maintenance, service, repair and disposal of appliance. Approved methods of recovery, recycling or reclaiming must be followed.

IMPORTANT

If this unit is being matched with an approved line set or indoor unit coil which was previously charged with mineral oil, 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 expansion device, and reduce the system performance and capacity. Failure to properly flush the system per the instructions below will void the warranty.

Leak Testing the System

IMPORTANT

Leak detector must be capable of sensing HFC refrigerant.

WARNING

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).

WARNING

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

Failure to follow this warning may result in personal injury or death.

WARNING

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.

Page 18

XC17

TO VAPOR

SERVICE VALVE

HFC−410A

MANIFOLD GAUGE SET

OUTDOOR UNIT

HIGH

LOW

NITROGEN

NOTE  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.

A With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set.

Open the valve on the HFC−410A cylinder (vapor only).

B 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 two ounces (57 g) refrigerant or three pounds (31 kPa) pressure]. Close the valve on the HFC−410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC−410A cylinder.

C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.

D 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.

E After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable

with a leak detector.

F After leak testing disconnect gauges from service ports.

LINE SET AND INDOOR COIL

After the line set has been connected to the indoor unit and air conditioner, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks:

LEAK TEST

A Connect an HFC−410A manifold gauge set high

pressure hose to the vapor valve service port.

B With both manifold valves closed, connect the

cylinder of HFC−410A refrigerant to the center port of the manifold gauge set.

CONNECT GAUGE SET

TEST FOR LEAKS

NOTE  Later in the procedure, the HFC−410A container will be replaced by the nitrogen container.

Page 19

XC17

Evacuating the System

A Open both manifold valves and start the vacuum pump. B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).

NOTE  During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure indicates a relatively large leak. If this occurs, repeat the leak testing procedure.

NO TE  The t erm 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.

C 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.

D 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.

E 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.

F 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 valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit.

G Perform the following:

OUTDOOR

UNIT

TO VAPOR

SERVICE VALVE

TO LIQUID LINE SERVICE VALVE

MICRON

GAUGE

VACUUM PUMP

A34000 1/4 SAE TEE WITH SWIVEL COUPLER

500

MANIFOLD

GAUGE SET

HFC−410A

RECOMMEND

MINIMUM 3/8" HOSE

A Connect low side of manifold gauge set

with 1/4 SAE in−line tee to vapor line service valve

B Connect high side of manifold gauge

set to liquid line service valve

C Connect micron gauge available

connector on the 1/4 SAE in−line tee.

D Connect the vacuum pump (with

vacuum gauge) to the center port of the manifold gauge set. The center port line will be used later for both the HFC−410A and nitrogen containers.

HIGH

LOW

1/6 TURN

NITROGEN

EVACUATING

CONNECT GAUGE SET

EVACUATE THE SYSTEM

S Close manifold gauge valves. S Shut off HFC−410A cylinder. S Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core

tool while maintaining a positive system pressure.

S Replace the stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as illus-

trated.

LINE SET AND INDOOR COIL

NOTE  Remove cores from service valves (if not already done).

Page 20

XC17

IMPORTANT

Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns. Use an instrument capable of accurately measuring down to 50 microns.

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.

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 suction combine with refrigerant to produce substances that corrode copper piping and compressor parts.

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.

24VAC TRANSFORMER

Use the transformer provided with the furnace or air handler for low-voltage control power (24VAC − 40 VA minimum)

Refer to the unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker (HACR per NEC). Install power wiring and properly sized disconnect switch.

NOTE  Units are approved for use only with copper conductors. Ground unit at disconnect switch or to an earth ground.

SIZE CIRCUIT AND INSTALL DISCONNECT SWITCH

NOTE  24VAC, Class II circuit connections are made in the control box.

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

THERMOSTAT

5 FEET

(1.5M)

INSTALL THERMOSTAT

SERVICE DISCONNECT

SWITCH

Page 21

XC17

NOTE  For proper voltages, select thermostat wire (control wires) gauge per table below.

WIRE RUN LENGTH AWG# INSULATION TYPE

LESS THAN 100’ (30 METERS) 18 TEMPERATURE RATING

MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.

NOTE  Wire tie provides low voltage wire strain relief and to maintain separation of field installed low and high voltage circuits.

NOTE  Do not bundle any excess 24VAC control wires inside control box.

ROUTE CONTROL WIRES  NON−COMMUNICATING

A175 MAIN

CONTROL

CONTROL BOX

HOLE

Install low voltage control wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated. See figures 8 and 9 for typical configurations.

A Run 24VAC control wires through hole with grommet.

B Make 24VAC control wire connections to air conditioner control

(A175).

ROUTE CONTROL WIRES  COMMUNICATING

Maximum length of wiring (18 gauge) for all connections on the RSBus is limited to 1500 feet (457 meters). Color−coded, temperature rating 95ºF (35

C) minimum, solid core. (Class II Rated Wiring)

Point−to−point connections shall not exceed 500 feet (152 meters).

Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting.

ROUTE HIGH VOLTAGE AND GROUND WIRES

CONTROL BOX

PIPING PANEL

HIGH VOLTAGE

CONDUIT HOLE

HVAC

GROUND LUG

CONTACTOR

WATERTIGHT

CONDUIT

FITTING

WATERTIGHT

FLEXIBLE CONDUIT

ACCESS VIEW

ELECTRICAL INLET

(HIGH VOLTAGE)

WIRING ENTRY POINTS

ELECTRICAL INLET (CONTROL WIRING  LOW VOLTAGE). USE BUSHING PROVIDED IN BAG ASSEMBLY HERE.

TO SERVICE

DISCONNECT BOX

Page 22

XC17

Field Control Wiring

Air Handler Control

ComfortSense[ 7000 Thermostats

Catalog # Y0349 or Y2081

One−Stage

Air Conditioner Control

i−

On−board link

Low voltage thermostat wiring

Flat metal jumper

1. Thermostat T terminals are used for outdoor sensor input. Use for thermostat’s outdoor temperature display (optional).

2. R to L connection is required for this model when using the ComfortSense

7000 − catalog number Y0349 only. Resistor Kit (catalog number

47W97) required and ordered separately.

3. Air handler control ships from factory with metal jumpers installed across W1, W2 and W3. For one−stage electric heat, do not remove factory

installed metal jumpers.

4. Air handler control ships from factory with metal jumpers installed across W1, W2 and W3. For two−stage electric heat, remove factory installed metal jumper between W1 to W2. Then connect thermostat wire between the air handler control’s W2 and the thermostat’s W2 terminal.

5. Cut on−board link (clippable wire) DS−R for Humiditrol

or Harmony IIIt applications. This will slow the indoor blower motor to the lowest speed

setting. See air handler installation instruction or engineering handbook for lowest fan speed information.

Figure 8. ComfortSense® 7000 Series Thermostat 

Air Hander/One−Stage Air Conditioner

Page 23

XC17

Furnace Control

ComfortSense[ 7000 Thermostats

Catalog # Y0349 or Y2081

One−Stage

Air Conditioner Control

i−

Cut on−board link (W914) (clippable wire) from DS to R for dehumidification (Optional).

On−board link

Low voltage thermostat wiring

1. Thermostat T terminals are used for outdoor sensor input. Use for thermostat’s outdoor temperature display (optional).

2. R to L connection is required for this model when using the ComfortSense

7000 − catalog number Y0349 only. Resistor Kit (catalog number

47W97) required and ordered separately.

3. Cut on−board link (clippable wire) DS−R for Humiditrol

or Harmony IIIt applications. This will slow the indoor blower motor to the lowest speed

setting. See furnace installation instruction or engineering handbook for lowest fan speed information.

Figure 9. ComfortSense® 7000 Series Thermostat 

Furnace/One−Stage Air Conditioner

Page 24

XC17

Air Conditioner Control (A175) Jumpers and Terminals

AIR CONDITIONER CONTROL  ONE STAGE

TABLE 3 PROVIDES ADDITIONAL INFORMATION CONCERNING JUMPERS, LOOP, AND CONNECTIONS FOR THE AIR CONDITIONER CONTROL.

DS13 and DS15

DS11 and DS14

LED ALERT

CODES

LED ALERT

CODES

CUT FOR HUMIDITROL  ENHANCED DEHUMIDIFICATION ACCESSORY (EDA) APPLICATIONS.

E12

E16

E33

TEST PINS

Figure 10. Control Jumpers, Loop and Terminals (XC17−XXX−230−01)

Page 25

XC17

COMMUNICATING

STATUS INDICATOR

AIR CONDITIONER CONTROL  ONE STAGE

TABLE 3 PROVIDES ADDITIONAL INFORMATION CONCERNING JUMPERS, LOOP, AND CONNECTIONS FOR THE AIR CONDITIONER CONTROL.

DS12

DS13 and DS15

DS11 and DS14

LED ALERT

CODES

LED ALERT

CODES

E12

E16

E33

TEST PINS

CUT FOR HUMIDITROL APPLICATION (TWO−STAGE UNITS ONLY)

Figure 11. Control Jumpers, Loop and Terminals (XC17−XXX−230−02 and later)

Page 26

XC17

Table 3. Air Conditioner Control (A175) Jumpers and Terminals

Board ID Label Description

E12 PSC Fan 240 VAC output connection for outdoor fan.

E16 PSC Fan 240 VAC input connection for outdoor fan.

E18

W 24VAC output for defrost auxiliary heat output.

L Thermostat service light connection.

Y2 24VAC thermostat input/output for second stage operation of the unit.

Y1 24VAC thermostat input for first stage operation of the unit.

O 24VAC thermostat input for reversing valve operation

DS Humiditrol Input

C 24VAC system common (− Build −02 and later)

i−

Input/Output − RSBus data low. Used in communicating mode only with compatible indoor thermostat. (− Build

−02 and later)

Input/Output − RSBus data high. Used in communicating mode only with compatible indoor thermostat. (−

Build −02 and later)

R 24VAC system power input

E21 and E22 LO−PS S4 connection for low−pressure switch (2.4 milliamps @ 18VAC)

E31 and E32 Y1 OUT 24VAC common output, switched for enabling compressor contactor.

E24 and E25 HS−PS S87 connection for high−pressure switch (E25) and 24VAC (E24) to A177 R" input.

E26 FAN 1

First Stage and second stage basic and precision dehumidification ECM fan motor 24VDC output connection

E27 FAN 2 Second stage basic and precision dehumidification ECM fan motor 24VDC output connection 2.

E28 FAN C ECM common connection for ECM fan.

E30

Six position square pin header E30 provides connections for the temperature sensors.

DIS (YELLOW) Pins 5 and 6

DIS 5  Discharge line temperature sensor supply.

DIS 6  Discharge line temperature sensor return.

Range is −35ºF to 310ºF. Sensor is clipped on a 1/2" copper tube.

AMB (BLACK) Pins 3 and 4

AMB 3  Outdoor ambient temperature sensor supply. AMB 4  Outdoor ambient temperature return.

Range is −40ºF to +140ºF

COIL (BROWN) Pins 5 and 6

Not used

E33 Field Test

This jumper allows service personnel to defeat the timed off control, and field programming of unit capacity feature. Placing a jumper across both pins on E33 will terminate the anti−short delay. It will also clear lockout alarms

W1 Short DS To R Cut for Humiditrol (EDA) application. Use only in two−stage units.

* Factory default setting

Page 27

XC17

Unit Start−Up

IMPORTANT

If unit is equipped with a 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 binding.

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

3. After evacuation is complete, open both the liquid and vapor line service valves to release the refrigerant charge contained in outdoor unit into the system.

4. Replace the stem caps and tighten to the value listed in table 1.

5. Check voltage supply at the disconnect switch. The voltage must be within the range listed on the unit’s

nameplate. If not, do not start the equipment until you have consulted with the power company and the voltage condition has been corrected.

6. Set the thermostat for a cooling demand. Turn on power to the indoor indoor unit and close the outdoor unit disconnect switch to start the unit.

7. Recheck voltage while the unit is running. Power must be within range shown on the nameplate.

8. Check system for sufficient refrigerant by using the procedures listed under System Charge.

System Refrigerant

This section outlines procedures for:

1. Connecting gauge set for testing and charging;

2. Checking and adjusting indoor airflow;

TO LIQUID

LINE SERVICE

VALV E

TEMPERATURE

SENSOR

DIGITAL SCALE

REFRIGERANT TANK

TEMPERATURE SENSOR

(LIQUID LINE)

MANIFOLD GAUGE SET

A Close manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. Set for liquid phase charging.

B Connect the manifold gauge set’s low pressure side to the suction line service port.

C Connect the manifold gauge set’s high pressure side to the liquid line service port.

D Position temperature sensor on liquid line near liquid line service port.

OUTDOOR UNIT

CHARGE IN

LIQUID PHASE

CONNECTIONS FOR TESTING AND CHARGING

GAUGE SET

LOW

HIGH

SUCTION LINE SERVICE PORT CONNECTION

Figure 12. Gauge Set Setup and Connections

Page 28

XC17

ADDING OR REMOVING REFRIGERANT

This system uses HFC−410A refrigerant which operates at much higher pressures than HCFC−22. The pre−installed liquid line filter drier is approved for use with HFC−410A only. Do not replace it with components designed for use with HCFC−22. This unit is NOT approved for use with coils which use capillary tubes or fixed orifices as a refrigerant metering device.

Check airflow using the Delta−T (

DT) process using the illustration in figure 13.

Cº T

Drop

– DT = ºF ACTION

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

80 24 24 24 23 23 22 22 22 20 19 18 17 16 15 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12 72 20 20 19 18 17 17 16 15 15 14 13 12 11 10 70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

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

Temperature of air entering indoor coil ºF

INDOOR COIL

DRY BULB

DRY

BULB

WET BULB

Drop

19º

Dry−bulb

Wet−bulb ºF

72º

64º

53º

air flow

All temperatures are expressed in ºF

1. Determine the desired DT  Measure entering air temperature using dry bulb (A) and wet bulb (B). DT is the intersecting value of A and B in the table (see triangle).

2. Find temperature drop across coil  Measure the coil’s dry bulb entering and leaving air temperatures (A and C). Temperature Drop Formula: (T

Drop

) = A minus C.

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

Drop

and the desired

DT (T

Drop

–DT) is within +3º, no adjustment is needed. See example below:

4. Adjust the fan speed  See indoor unit instructions to increase/decrease fan speed.

Assume DT = 15 and A temp. = 72º, these C temperatures would necessitate stated actions:

AIRFLOW

Use the following procedure to adjust for optimal air flow across the indoor coil:

INDOOR COIL

Changing air flow affects all temperatures; recheck temperatures to confirm that the temperature drop and DT are within +

3º.

Figure 13. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart

Page 29

XC17

Use WEIGH IN to initially charge a system when the outdoor unit is void of charge. To verify charge and add or

remove refrigerant use either

APPROACH or SUBCOOLING methods.

WHEN TO CHARGE?

S Warm weather best S Can charge in colder weather

CHARGE METHOD? Determine by:

S Outdoor ambient temperature

REQUIREMENTS:

S Sufficient heat load in structure S Indoor temperature between 70-80ºF (21−26ºC) S Manifold gauge set connected to unit S Thermometers:

− to measure outdoor ambient temperature

− to measure liquid line temperature

− to measure suction line temperature

TXV

APPROACH OR

SUBCOOLING

65ºF

(18.3ºC) and

Above

START: Determine the correct charge method:

WEIGH-IN

64ºF

(17.7ºC) and

Below

Figure 14. Determining Charge Method

WEIGH IN

Liquid Line

Set Diameter

Ounces per 5 feet (g per 1.5 m)

adjust from 15 feet (4.6 m) line set*

3/8" (9.5 mm)

3 ounce per 5’ (85 g per 1.5 m)

*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.

Refrigerant Charge per Line Set Length

NOTE  The exampled nameplate is for illustration purposes only. Use data listed on actual unit nameplate for charging.

CHARGING METHOD

CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF 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 amount. for variation

in line set length listed on

line set length table below.

Total charge

64ºF (17.7ºC) and Below

Figure 15. Using HFC−410A Weigh In Method

Page 30

XC17

APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])*

If refrigerant added or removed, retest to confirm that unit is properly charged

If value is greater than shown (high approach), add refrigerant; if less than shown (liquid temp too close to ambient temp, low approach), remove refrigerant.

1. Confirm proper airflow across coil using figure 13.

2. Compare unit pressures with table 4, Normal Operating Pressures.

3. Use APPROACH to correctly charge unit or to verify the charge is correct.

4. Set thermostat to call for heat (must have a cooling load between 70-80ºF (21−26ºC).

5. Connect gauge set.

6. When heat demand is satisfied, set thermostat to call for cooling.

7. Allow temperatures and pressures to stabilize.

8. Record outdoor ambient temperature:

AMBº =_________

9. Record line temperature:

LIQº = __________

10. Subtract to determine approach (APPº):

LIQº_____ − AMBº _____ = APPº_____

11. Compare results with table to the left.

Models (XC17−XXX−230−01 and −02)

ºF (ºC)* −024 −030 −036 −042 −048 −060. . . . . .

Any 10 (5.6) 10 (5.6) 6 (3.3) 10 (5.6) 8 (4.4) 8 (4.4)

. . .

*Temperature of air entering outdoor coil

65ºF (18.3ºC) and Above

TEST AND CHARGE METHOD

APPROACH

* These approach values are also listed on the unit charging sticker 580005−01 located on the access panel.

Models (XC17−XXX−230−03)

ºF (ºC)* −024 −030 −036 −042 −048 −060. . . . . .

Any 10 (5.6) 10 (5.6) 6 (3.3) 10 (5.6) 8 (4.4) 9 (5.0)

. . .

*Temperature of air entering outdoor coil

Figure 16. Using Approach Test and Charge Method

SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°])

If refrigerant added or removed, verify charge using the approach method

If value is greater than shown, remove refrigerant; if less than shown, add refrigerant

1. Confirm proper airflow across coil using figure 13.

2. Compare unit pressures with table 4, Normal Operating Pressures.

3. Use SUBCOOLING to correctly charge unit or to verify the charge is correct.

4. Set thermostat to call for heat (must have a cooling load between 70-80ºF (21−26ºC)

5. Connect gauge set

6. Measure outdoor ambient temperature

7. When heat demand is satisfied, set thermostat to call for cooling

8. Allow temperatures and pressures to stabilize.

NOTE − If necessary, block outdoor coil to maintain 325 − 375 psig.

9. Record liquid line temperature:

LIQº = ______

10. Measure liquid line pressure and use the value to determine saturation temperature (see table 5):

SATº = ______

11. Subtract to determine subcooling (SCº):

SATº_____ − LIQº _____ = SCº _____

12. Compare results with table to the left.

Models (XC17−XXX−230−01, −02 and −03)

ºF (ºC)* −024 −030 −036 −042 −048 −060. . . . . .

Any 4 (2.2) 4 (2.2) 7 (3.9) 5 (2.8) 6 (3.3) 6 (3.3)

. . .

*Temperature of air entering outdoor coil

SUBCOOLING

TEST AND CHARGE METHOD

65ºF (18.3ºC) and Above

* These subcooling values are also listed on the unit charging sticker 580005−01 located on the access panel.

CARDBOARD OR

PLASTIC SHEET

BLOCK OUTDOOR COIL: [sometimes necessary with lower temperatures] Use cardboard or plastic sheet to restrict the airflow through the outdoor coil to achieve pressures from 325−375 psig (2240−2585 kPa). Higher pressures are needed to check charge. Block equal sections of air intake panels and move coverings sideways until the liquid pressure is in the above noted ranges.

Figure 17. Using Subcooling Test and Charge Method

Page 31

XC17

Operating and Temperature 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.

IMPORTANT

Use this table to perform maintenance checks; it is not a procedure for charging the system. Minor variations in these pressures may be due to differences in installations. Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system.

Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)*

(XC17−XXX−230−01 and −02)

Model −024 −030 −036 −042 −048 −060

F (C)** Liquid Suction Liquid Suction Liquid Suction Liquid Suction Liquid Suction Liquid Suction

65 (18.3) 234 139 236 134 226 134 232 137 232 132 236 131

70 (21.1) 249 140 251 135 245 135 249 139 249 133 254 132

75 (23.9) 268 141 271 138 266 137 270 140 268 134 273 133

80 (26.7) 289 142 291 139 287 138 291 141 288 135 294 135

85 (29.4) 310 142 312 140 310 139 314 142 311 136 317 136

90 (32.2) 334 144 335 142 333 140 338 143 333 137 340 137

95 (35.0) 358 145 358 142 358 141 363 144 357 138 364 139

100 (37.8) 383 146 383 143 383 143 389 145 380 139 389 140

105 (40.6) 408 147 409 144 410 144 419 147 406 140 416 142

110 (43.3) 436 148 436 145 437 145 447 148 433 142 444 143

115 (46.1) 465 150 467 147 464 146 480 149 462 143 475 145

(XC17−XXX−230−03)

65 (18.3) 234 139 236 134 226 134 232 137 232 132 237 136

70 (21.1) 249 140 251 135 245 135 249 139 249 133 255 137

75 (23.9) 268 141 271 138 266 137 270 140 268 134 275 138

80 (26.7) 289 142 291 139 287 138 291 141 288 135 296 139

85 (29.4) 310 142 312 140 310 139 314 142 311 136 320 141

90 (32.2) 334 144 335 142 333 140 338 143 333 137 343 142

95 (35.0) 358 145 358 142 358 141 363 144 357 138 367 143

100 (37.8) 383 146 383 143 383 143 389 145 380 139 391 144

105 (40.6) 408 147 409 144 410 144 419 147 406 140 418 146

110 (43.3) 436 148 436 145 437 145 447 148 433 142 447 147

115 (46.1) 465 150 467 147 464 146 480 149 462 143 478 149

* Typical pressures only, expressed in psig (liquid +/− 10 and vapor+/− 5 psig); indoor match up, indoor air quality, and indoor load will cause the

pressures to vary. These operating pressures are also listed on the unit charging sticker (580005−01) located on the access panel.

** Temperature of air entering outdoor coil.

Table 5. HFC−410A Temperature (°F) − Pressure (Psig)

°F °C Psig °F °C Psig

−40 −40.0 11.6 60 15.6 170

−35 −37.2 14.9 65 18.3 185

−30 −34.4 18.5 70 21.1 201

−25 −31.7 22.5 75 23.9 217

−20 −28.9 26.9 80 26.7 235

−15 −26.1 31.7 85 29.4 254

−10 −23.3 36.8 90 32.2 274

−5 −20.6 42.5 95 35.0 295 0 −17.8 48.6 100 37.8 317 5 −15.0 55.2 105 40.6 340

10 −12.2 62.3 110 43.3 365 15 −9.4 70.0 115 46.1 391 20 −6.7 78.3 120 48.9 418 25 −3.9 87.3

125 51.7 446 30 −1.1 96.8 130 54.4 476 35 1.7 107 135 57.2 507 40 4.4 118 140 60.0 539 45 7.2 130

145 62.8 573 50 10.0 142

150 65.6 608 55 12.8 155

Page 32

XC17

System Operation

IMPORTANT

Some scroll compressor have internal vacuum protector that will unload scrolls when suction pressure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. Protector will reset when low pressure in system is raised above 40 psig. DO NOT REPLACE COMPRESSOR.

The air conditioner control (A175) provides the following system functions:

S Compressor anti−short−cycle delay. S High and low pressure switches S Ambient and Discharge Line Temperatures Monitoring

and Protection.

S Five strikes lockout safety feature for High/Low Pressure

Switches and High Discharge Line Temperature. See figures 34, 33 and 35 feature function.

COMPRESSOR ANTI−SHORT CYCLE DELAY

The air conditioner control (A175) protects the compressor from:

S Short cycling (five minutes) when there is initial power up S Interruption in power to the unit S High or low pressure switch or discharge line sensor trips S Delay after Y1 demand is removed.

The anti−short timer in the air conditioner control is five (5) minutes. To override timer when active or inactive − place jumper on the field test pins between 1 and 2 seconds.

Resetting Anti−Short Cycle Delay

The FIELD TEST pins (E33) on the air conditioner control (A175) can be jumpered between 1 to 2 seconds to bypass delay.

HIGH AND LOW PRESSURE SWITCHES

The unit’s reset pressure switches LO PS (S4) and HI PS (S87) are factory−wired into the air conditioner control (A175) on the LO−PS and HI−PS terminals, there locations are illustrated on page 5. Sequence of operations for both pressure switches are provided in figures 34 and 33.

When replacing either the high or low pressure switches, tighten switch using either of the following methods:

S With Torque Wrench: Finger tighten and torque to 100

inch pounds.

S Without Torque Wrench: Finger tighten and use an

appropriately sized wrench to turn an additional 1/2 to full turn clockwise.

1/2 TURN TO

FULL TURN

HIGH DISCHARGE LINE TEMPERATURE SENSOR

(RT28)

The high discharge line temperature sensor location is illustrated on page 5. This sensor’s sequence of operations is provided in figure 35.

High Discharge Line Sensor Open/Shorted Event

Condition

Discharge sensor open / short fault is ignored during initial 90−seconds of compressor run time. After that, if discharge temperature sensor is detected open or short, the control will de−energize all the outputs and anti−short cycle timer is started. Discharge sensor faulty alert LED code will be displayed.

OUTDOOR AMBIENT TEMPERATURE (RT13)

If the outdoor ambient temperature sensor detected a open, or out of range −40ºF to +140ºF (−40ºC to 60ºC) then LED alert codes are displayed, however cooling operation will continue. See table 9 for LED alert codes for the ambient sensor. Location of outdoor ambient temperature sensor is illustrated on page 5.

COIL TEMPERATURE SENSOR

This model does not use a coil temperature sensor. The cable assembly attached to the air conditioner control (A175)’s E30 connection has a 10K resister installed between pins 5 and 6 as illustrated in figure 18. No alerts or alarms would be generated if resistor is damage.

10K resistor

High Discharge Line

Temperature Sensor

Ambient Air

Temperature

Sensor

Figure 18. 10k Resistor Location

TESTING AMBIENT AND HIGH DISCHARGE LINE TEMPERATURE SENSORS

Sensors connect through a field-replaceable harness assembly that plugs directly into the air conditioner control (A175). Through these sensors, the air conditioner control can monitor outdoor ambient and discharge line temperature fault conditions. As the detected temperature changes, the resistance across the sensor changes. figures 7 and 8 lists how the resistance varies as the temperature changes for both type of sensors. Sensor resistance values can be checked by ohming across pins shown in table 6.

When a sensor indicates a resistance value that is not within the range as listed in table 6, then the following condition may be present:

Page 33

XC17

S Sensor detects an out−of−range outdoor ambient air

temperature condition and will display LED alert code on the air conditioner control.

S The sensor is operating normally when the ambient air

temperature at the sensor is below or above the air conditioner control (A175)’s expected ohm values. The Air conditioner control (A175) will indicate the sensor as faulty, however under this scenario, the sensor is not actually faulty.

S Once the outdoor ambient air temperature has returned

to within the sensor’s normal operating range, the LED alert code will automatically stop.

Table 6. Sensor Temperature / Resistance Range

Sensor

Temperature Range °F (°C)

Resistance values range (ohms)

Pins/Wire Color

RT13 Outdoor (Ambient)

−40ºF to 140ºF (−40ºC to 60ºC)

280,000 to 3750 3 and 4

(Black)

RT28 High Discharge Line Temperature Sensor

−35ºF to 310ºF

(−37ºC to 154ºC)

41,000 to 103 1 and 2

(Yellow)

Note: Sensor resistance decreases as sensed temperature increases (see figures 7 and 8).

TEST PINS FUNCTION

Placing the JUMPER ON the field test pins (E33) (see page 24 for location of TEST pins) allows the technician to

S Clear compressor anti−short cycle delay. S Clear five−strike fault lockouts  High/low pressure switches and high discharge temperature sensor.

NOTES: 1  Placing a JUMPER ON the TEST pins will not bring the unit out of inactive mode. The only way manually

activate the outdoor unit from an inactive mode is to cycle the 24VAC power to the outdoor unit’s air conditioner control (A175).

2  If the jumper remains on the TEST pins for longer than five seconds, the air conditioner control (A175) will ignore the JUMPER ON TEST pins and revert to normal operation.

Y1 Active

Place a JUMPER ON

the TEST pins for longer than one

second

. Then remove jumper and place in JUMPER

OFF position.

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.

JUMPER

OFF

JUMPER

FACTORY DEFAULT

JUMPER SETTING

Figure 19. Clearing Anti−Short Cycle Delay and Five−Strike Fault Lockouts

Page 34

XC17

Table 7. RT13 Ambient Sensor Temperature / Resistance Range

Degrees

Fahrenheit

Resistance

Degrees

Fahrenheit

Resistance

Degrees

Fahrenheit

Resistance

Degrees

Fahrenheit

Resistance

136.3 2680 56.8 16657 21.6 44154 −11.3 123152

133.1 2859 56.0 16973 21.0 44851 −11.9 125787

130.1 3040 55.3 17293 20.5 45560 −12.6 128508

127.3 3223 54.6 17616 20.0 46281 −13.2 131320

124.7 3407 53.9 17942 19.4 47014 −13.9 134227

122.1 3592 53.2 18273 18.9 47759 −14.5 137234

119.7 3779 52.5 18607 18.4 48517 −15.2 140347

117.5 3968 51.9 18945 17.8 49289 −15.9 143571

115.3 4159 51.2 19287 17.3 50074 −16.5 146913

113.2 4351 50.5 19633 16.8 50873 −17.2 150378

111.2 4544 49.9 19982 16.3 51686 −17.9 153974

109.3 4740 49.2 20336 15.7 52514 −18.6 157708

107.4 4937 48.5 20695 15.2 53356 −19.3 161588

105.6 5136 47.9 21057 14.7 54215 −20.1 165624

103.9 5336 47.3 21424 14.1 55089 −20.8 169824

102.3 5539 46.6 21795 13.6 55979 −21.5 174200

100.6 5743 46.0 22171 13.1 56887 −22.3 178762

99.1 5949 45.4 22551 12.5 57811 −23.0 183522

97.6 6157 44.7 22936 12.0 58754 −23.8 188493

96.1 6367 44.1 23326 11.5 59715 −24.6 193691

94.7 6578 43.5 23720 11.0 60694 −25.4 199130

93.3 6792 42.9 24120 10.4 61693 −26.2 204829

92.0 7007 42.3 24525 9.9 62712 −27.0 210805

90.6 7225 41.7 24934 9.3 63752 −27.8 217080

89.4 7444 41.1 25349 8.8 64812 −28.7 223677

88.1 7666 40.5 25769 8.3 65895 −29.5 230621

86.9 7890 39.9 26195 7.7 67000 −30.4 237941

85.7 8115 39.3 26626 7.2 68128 −31.3 245667

84.5 8343 38.7 27063 6.7 69281 −32.2 253834

83.4 8573 38.1 27505 6.1 70458 −33.2 262482

82.3 8806 37.5 27954 5.6 71661 −34.1 271655

81.2 9040 37.0 28408 5.0 72890 −35.1 281400

80.1 9277 36.4 28868 4.5 74147 −36.1 291774

79.0 9516 35.8 29335 3.9 75431 −37.1 302840

78.0 9757 35.2 29808 3.4 76745 −38.2 314669

77.0 10001 34.7 30288 2.8 78090 −39.2 327343

76.0 10247 34.1 30774 2.3 79465

75.0 10496 33.5 31267 1.7 80873

74.1 10747 33.0 31766 1.2 82314

73.1 11000 32.4 32273 0.6 83790

72.2 11256 31.9 32787 0.0 85302

71.3 11515 31.3 33309 −0.5 86852

70.4 11776 30.7 33837 −1.1 88440

69.5 12040 30.2 34374 −1.7 90068

68.6 12306 29.6 34918 −2.2 91738

67.7 12575 29.1 35471 −2.8 93452

66.9 12847 28.6 36031 −3.4 95211

66.0 13122 28.0 36600 −4.0 97016

65.2 13400 27.5 37177 −4.6 98870

64.4 13681 26.9 37764 −5.2 100775

63.6 13964 26.4 38359 −5.7 102733

62.8 14251 25.8 38963 −6.3 104746

62.0 14540 25.3 39577 −6.9 106817

61.2 14833 24.8 40200 −7.5 108948

60.5 15129 24.2 40833 −8.2 1111 41

59.7 15428 23.7 41476 −8.8 113400

59.0 15730 23.2 42130 −9.4 115727

58.2 16036 22.6 42794 −10.0 118126

57.5 16345 22.1 43468 −10.6 120600

Page 35

XC17

Table 8. RT28 High Discharge Sensor Temperature / Resistance Range

Degrees

Fahrenheit

Resistance

Degrees

Fahrenheit

Resistance

Degrees

Fahrenheit

Resistance

Degrees

Fahrenheit

Resistance

303.1 183 186.1 1052 136.8 2656 94.5 6613

298.1 195 185.0 1072 136.0 2698 93.6 6739

293.4 207 183.9 1093 135.2 2740 92.8 6869

289.0 220 182.8 1114 134.5 2783 92.0 7002

284.8 232 181.8 1135 133.7 2827 91.2 7139

280.9 245 180.7 1157 132.9 2872 90.3 7281

277.1 258 179.6 1179 132.2 2917 89.5 7426

273.6 270 178.6 1201 131.4 2963 88.6 7575

270.2 283 177.6 1223 130.6 3010 87.8 7729

267.0 297 176.6 1245 129.9 3057 86.9 7888

263.9 310 175.5 1268 129.1 3105 86.0 8051

260.9 323 174.6 1291 128.4 3154 85.2 8220

258.1 336 173.6 1315 127.6 3204 84.3 8394

255.3 350 172.6 1338 126.8 3255 83.4 8574

252.7 364 171.6 1362 126.1 3307 82.5 8759

250.1 378 170.6 1386 125.3 3359 81.6 8951

247.7 391 169.7 1411 124.6 3413 80.7 9149

245.3 405 168.7 1435 123.8 3467 79.8 9354

243.0 420 167.8 1460 123.1 3523 78.8 9566

240.8 434 166.9 1486 122.3 3579 77.9 9786

238.6 448 165.9 1511 121.6 3637 76.9 10013

236.5 463 165.0 1537 120.8 3695 76.0 10250

234.4 478 164.1 1563 120.1 3755 75.0 10495

232.4 492 163.2 1590 119.3 3816 74.1 10749

230.5 507 162.3 1617 118.5 3877 73.1 11014

228.6 523 161.4 1644 117.8 3940 72.1 11289

226.7 538 160.5 1672 117.0 4005 71.1 11575

224.9 553 159.7 1699 116.3 4070 70.0 11873

223.2 569 158.8 1728 115.5 4137 69.0 12184

221.5 584 157.9 1756 114.8 4205 68.0 12509

219.8 600 157.1 1785 114.0 4274 66.9 12848

218.1 616 156.2 1815 113.2 4345 65.8 13202

216.5 632 155.3 1845 112.5 4418 64.7 13573

214.9 649 154.5 1875 111.7 4491 63.6 13961

213.4 665 153.6 1905 111.0 4567 62.5 14368

211.9 682 152.8 1936 110.2 4644 61.3 14796

210.4 698 152.0 1968 109.4 4722 60.2 15246

208.9 715 151.1 1999 108.7 4802 59.0 15719

207.5 732 150.3 2032 107.9 4884 57.8 16218

206.0 750 149.5 2064 107.1 4968 56.6 16744

204.6 767 148.7 2098 106.4 5054 55.3 17301

203.3 785 147.9 2131 105.6 5141 54.0 17891

201.9 803 147.1 2165 104.8 5231 52.7 18516

200.6 821 146.2 2200 104.0 5323 51.4 19180

199.3 839 145.4 2235 103.3 5416 50.0 19887

198.0 857 144.6 2270 102.5 5512 48.6 20641

196.8 876 143.8 2306 101.7 5610 47.2 21448

195.5 894 143.0 2343 100.9 5711 45.7 22311

194.3 913 142.3 2380 100.1 5814

193.1 932 141.5 2418 99.3 5920

191.9 952 140.7 2456 98.5 6028

190.7 971 139.9 2495 97.7 6139

189.5 991 139.1 2534 96.9 6253

188.4 1011 138.3 2574 96.1 6370

187.2 1031 137.6 2615 95.3 6489

Page 36

XC17

System Status, Fault and Lockout LED Codes

LED codes are displayed via various LEDs located on the air conditioner control (A175). See page for locations of air conditioner control LEDs.

DS11 AND DS14  SYSTEM STATUS, FAULT AND LOCKOUT LED CODES

DS11 (Green) and DS14 (Red) LEDs indicate diagnostics conditions that are listed in table 9.

These LEDs display fault conditions in unit cooling capacity, dehumidification mode, anti−short cycle lockout, high and low pressures, discharge line temperature, outdoor temperature, and discharge sensor failures.

DS15 AND DS13  COMPRESSOR FAULT AND LOCKOUT LED CODES

DS15 (Yellow) and DS13 (Red) LEDs indicate diagnostics conditions that are listed in table 9.

These LEDs display the most common compressor or compressor related fault conditions in the unit. When an abnormal condition is detected, this function communicates the specific condition through LEDs. The diagnostic function is capable of detecting both mechanical and electrical system abnormal conditions.

IMPORTANT

DS15 and DS13 compressor LED fault and lockout codes do not provide safety protection. The is a monitoring function only and cannot control or shut down other devices.

RESETTING FAULT AND LOCKOUT LED CODES

All LED fault and lockout codes can be reset manually or automatically:

1. Manual Reset

Manual reset can be achieve by one of the following methods:

S Disconnect R wire from the air conditioner

control’s R terminal.

S Turning main power OFF and then ON at the unit’s

disconnect switch.

After power up, existing code will display for 60 seconds and then clear.

2. Automatic Reset

After a fault or lockout error is detected, the air conditioner control continues to monitor the unit’s system status and compressor operations. When/if conditions return to normal, the alarm code is turned off automatically.

Table 9. System Status, Fault and Lockout LED Codes and Related icomfort

t Touch Thermostat Alert Codes

NOTE  System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then system status LEDs are routinely displayed. See notes 1 and 2 in table below for duration of fast / slow flashes and pause.

Air Conditioner

Control LEDs

icomfort

Toucht

Thermostat

Display

Condition

Possible Cause(s)

Solution

DS11

Green

DS14 Red

SYSTEM STATUS

OFF OFF Not Applicable Power problem

No power (24V) to air conditioner control terminals R and C or control failure.

Check control transformer power (24V).

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

Simultaneous SLOW

Flash

Not Applicable Normal operation

Unit operating normally or in standby mode.

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

Alternating SLOW

Flash

Not Applicable

5−minute

anti−short cycle

delay

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

None required (Jumper FIELD TEST pins to override)

Simultaneous FAST

Flash

Moderate /

Critical Alert

Code 180

Ambient Sensor

Problem

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

ON ON Not Applicable

Air Conditioner Control (A175)

Failure

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

Page 37

XC17

Air Conditioner

Control LEDs

Solution

Possible

Cause(s)

Condition

icomfort Toucht

Thermostat

Display

DS11

Green

Solution

Possible

Cause(s)

Condition

icomfort Toucht

Thermostat

Display

DS14 Red

DS11

Green

Solution

Possible

Cause(s)

Condition

icomfort Toucht

Thermostat

Display

DS14 Red

OFF

1 Fast

Flash then

Pause

Not Applicable

Heating Low

Capacity

These are codes that show status of operation whether in low stage or high stage, heating or cooling, defrost or in the EDA mode.

OFF

2 Fast

Flash then

Pause

Not Applicable

Heating High

Capacity

2 Fast

Flash then

Pause

Not Applicable Defrost

1 Fast

Flash then

Pause

OFF Not Applicable

Cooling Low

Capacity

2 Fast

Flash then

Pause

OFF Not Applicable

Cooling High

Capacity

2 Fast

Flash then

Pause

ON Not Applicable

Dehumidification

Mode

ALERT STATUS

NONE NONE

Moderate Alert

Code 105

Device

Communication

Failure

icomfort Toucht thermostat device is unable to communicate with any other device on the RSBus. Alarm only occurs if a specific device did communicate initially after power up and communication was later lost. Possible causes are lost connection, bus short or open, or other device stop responding.

NONE NONE

Moderate Alert

Code 120

Unresponsive

Device

Message could be sent by any device on RSBus if expected response message is not received from other device. If sent by indoor or air conditioner control, device did not get expected response (incorrect or no response at all) from active Subnet controller. If sent by the icomfort Touch, and did not get the expected response (incorrect or no response at all) from device. Normally this indicate device malfunction.

NONE NONE

Critical Alert

Code 124

Active subnet

controller missing

Device lost connection to icomfort Toucht thermostat. Thermostat is sending heartbeat message in one minute intervals. Device sets this alarm if no Heartbeat is received for three minutes. Normally this indicate lost connection to thermostat, or thermostat is not working. Alert will clear after valid subnet controller message is received.

NONE NONE

Critical Alert

Code 125

Hardware Failure

Entire or partial system failure. Alert will clear 300 seconds after fault has recovered.

NONE NONE

Moderate /

Critical Alert

Code 126

Internal control communication

failure

Internal communication on air conditioner control. Alert will clear 300 seconds after fault has recovered.

NONE NONE

Critical Alert

Code 131

Corrupted Control

Parameters

System stored configuration data is corrupted. System will not run. Refer to communicating thermostat for memory corrupt handling.

NONE NONE

Critical Alert

Code 132

Failed Flash CRC

check.

No operations, air conditioner control enters boot loader mode. Alarm will clears after reset.

OFF

SLOW

Flash

Moderate Alert

Code 410

Low Pressure

Fault

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.

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 ON

Critical Alert

Code 411

Low Pressure

Switch Lockout

SLOW

Flash

OFF

Moderate Alert

Code 412

High Pressure

Fault

ON OFF

Critical Alert

Code 413

High Pressure

Discharge Sensor

Lockout

Page 38

XC17

Air Conditioner

Control LEDs

Solution

Possible Cause(s)

Condition

icomfort Toucht

Thermostat

Display

DS11

Green

Solution

Possible Cause(s)

Condition

icomfort Toucht

Thermostat

Display

DS14 Red

DS11

Green

Solution

Possible Cause(s)

Condition

icomfort Toucht

Thermostat

Display

DS14 Red

SLOW

Flash

Moderate Alert

Code 414

Discharge Line

Temperature

Fault

This code detects high discharge temperatures. If the discharge line temperature exceeds a temperature of 279ºF (137ºC) during compressor operation, the air conditioner control will de−energize the compressor contactor output (and the defrost output if active). The compressor will remain off until the discharge temperature has dropped below 225ºF (107ºC). See figure 35 for further details concerning lockouts and reset procedures.

FAST

Flash

Critical Alert

Code 415

Discharge Line

Temperature

Lockout

OFF Fast Flash

Moderate /

Critical Alert

Code 417

Discharge Sensor

Fault

The air conditioner control detects open or short sensor or out of temperature sensor range. This fault is detected by allowing the unit to run for 90 seconds before checking sensor resistance. If the sensor resistance is not within range after 90 seconds, the air conditioner control will raise the alarm.

Fast simultaneous flashing of DS11,

DS13, DS14 and DS15

OEM Mode Factory Test Mode.

1. Pause duration is two (2) seconds.

2. Fast flash duration is 1/2 second. Slow flash duration is one (1) second.

Table 10. Compressor Fault and Lockout LED Codes and Related icomfort Toucht Thermostat Alert Codes

Air Conditioner

Control LEDs

icomfort

Toucht

Thermostat

Display

Condition

Possible Cause(s)

Solution

Clearing Status

DS15 Yellow

DS13

Red

OFF ON

Moderate/

Critical Alert

Code 400

Compressor

Internal

Overload Trip

Thermostat demand signal Y1 is present, but compressor not running

Compressor protector is open.

S Check for high head pressure S Check compressor supply voltage

Outdoor unit power disconnect is open.

Compressor circuit breaker or fuse(s) is open.

Broken wire or connector is not making contact.

Low or high pressure switch open if present in the system.

Compressor contactor has failed to close.

Clears the error after current is sensed in the run and start winding for two seconds, service removed or power reset.

Page 39

XC17

Air Conditioner

Control LEDs

Clearing Status

Solution

Possible Cause(s)

Condition

icomfort

Toucht

Thermostat

Display

DS15 Yellow

Clearing Status

Solution

Possible Cause(s)

Condition

icomfort

Toucht

Thermostat

Display

DS13

Red

1 Flashes then Pause

OFF

Critical Alert

Code 401

Long run time.

Compressor is running extremely long run cycles.

Low refrigerant charge.

Evaporator blower is not running.

S Check blower relay coil and contacts S Check blower motor capacitor S Check blower motor for failure or

blockage

S Check evaporator blower wiring and

connectors

S Check indoor blower control S Check thermostat wiring for open cir-

cuit

Evaporator coil is frozen.

S Check for low suction pressure S Check for excessively low thermostat

setting

S Check evaporator airflow (coil block-

ages or return air filter)

S Check ductwork or registers for block-

age.

Faulty metering device.

S Check TXV bulb installation (size,

location and contact)

S Check if TXV/fixed orifice is stuck

closed or defective

Condenser coil is dirty

Liquid line restriction (filter drier blocked if present)

Thermostat is malfunctioning

S Check thermostat sub−base or wiring

for short circuit

S Check thermostat installation (loca-

tion and level)

Clears the error after 30 consecutive normal run cycles, or after power reset.

2 Flashes then Pause

OFF

Critical Alert

Code 402

System

Pressure Trip

Indicates the compressor protector is open or missing supply power to the compressor.

High head pressure.

S Check high pressure switch if present

in system

S Check if system is overcharged with

refrigerant

S Check for non−condensable in system

Condenser coil poor air circulation (dirty, blocked, damaged).

Condenser fan is not running.

S Check fan capacitor S Check fan wiring and connectors S Check fan motor for failure or block-

age

Return air duct has substantial leakage.

Clears after four consecutive normal compressor run cycles, or after power reset.

3 Flashes then Pause

OFF

Moderate

Alert Code

403

Short Cycling

Compressor is running less than three minutes.

Thermostat demand signal is intermittent.

Time delay relay or air conditioner control (A175) is defective.

If high pressure switch is present, see Flash Code 2 information.

Clears after four consecutive normal compressor run cycles, or after power reset.

4 Flashes then Pause.

OFF

Critical Alert

Code 404

Locked Rotor

Compressor has a locked out due to run capacitor short, bearings are seized, excessive liquid refrigerant.

Run capacitor has failed.

Low line voltage (contact utility if voltage at disconnect is low).

S Check wiring connections

Excessive liquid refrigerant in the compressor.

Compressor bearings are seized.

Clears after power reset or four normal compressor cycles.

Page 40

XC17

Air Conditioner

Control LEDs

Clearing Status

Solution

Possible Cause(s)

Condition

icomfort

Toucht

Thermostat

Display

DS15 Yellow

Clearing Status

Solution

Possible Cause(s)

Condition

icomfort

Toucht

Thermostat

Display

DS13

Red

5 Flashes then Pause

OFF

Critical Alert

Code 405

Open Circuit

Compressor has an open circuit due to power disconnection, fuse is open or other similar conditions.

Outdoor unit power disconnect is open.

Unit circuit breaker or fuse(s) is open.

Unit contactor has failed to close.

S Check compressor contactor wiring

and connectors

S Check for compressor contactor fail-

ure (burned, pitted or open)

S Check wiring and connectors be-

tween supply and compressor

S Check for low pilot voltage at com-

pressor contactor coil

High pressure switch is open and requires manual reset.

Open circuit in compressor supply wiring or connections.

Unusually long compressor protector reset time due to extreme ambient temperature.

Compressor windings are damaged.

S Check compressor motor winding re-

sistance

Clears after one normal compressor run cycle or power reset.

6 Flashes then Pause

OFF

Critical Alert

Code 406

Open Start

Circuit

Current not sensed by Start transformer.

Run capacitor has failed.

Open circuit in compressor start wiring or connections.

S Check wiring and connectors be-

tween supply and the compressor S terminal

Compressor start winding is damaged.

S Check compressor motor winding re-

sistance

Clears when amperage is detected in RUN and START sensors, or after power reset.

7 Flashes then Pause

OFF

Critical Alert

Code 407

Open Run

Circuit

Current not sensed by run transformer.

Open circuit in compressor start wiring or connections.

S Check wiring and connectors be-

tween supply and the compressor R terminal

Compressor start winding is damaged.

S Check compressor motor winding re-

sistance

Clears when amperage is detected in RUN and START sensors, or after power reset.

8 Flashes then Pause

OFF

Critical Alert

Code 408

Welded

Contactor

Compressor always runs

Compressor contactor failed to open.

Thermostat demand signal not connected to module.

Clears after one normal compressor run cycle or after power reset.

9 Flashes then Pause

OFF

Moderate/

Critical Alert

Code 409

Secondary

Low Voltage

24VAC is below 18VAC.

Air conditioner control (A175) circuit transformer is overloaded.

Low line voltage (contact utility if voltage at disconnect is low).

S Check wiring connections

Clears after voltage is higher than 20VAC for two seconds, or after power reset.

Fast simultaneous flashing of

DS11, DS13, DS14 and DS15

OEM Mode Factory Test Mode.

1. Pause duration is two (2) seconds.

2. Fast flash duration is 1/2 second. Slow flash duration is one (1) second.

3. Moderate and escalated up to critical if alarm exists for more than 10 minutes.

Page 41

XC17

Component Field Configuration and Troubleshooting

FAN MOTOR (B4) TEST PROCEDURE

A simple test can be used to test the fan motor operation. A fully charged 9V battery will be required for this procedure. See figure 23 for test procedure.

FAN MOTOR CONTROL (A177)

This section provides procedures for testing the fan control.

FAN MOTOR CONTROL LED CODES AND SEQUENCE OF OPERATIONS

During start up, the LED:

1. Display error conditions (see table 13), if present

2. If no errors are detected, then the LED code indicating stage operation (see table 15) will display the applicable code and then a long pause.

3. The fan motor speed / RPM (revolutions per minute) indicator is displayed next (see table 14).

4. After the RPM indicator is displayed, there is a short pause. The sequence repeats if a thermostat demand is still present. See figure 20 for LED sequence. See table 15 for description of flash and pause durations.

FAN MOTOR CONTROL TROUBLESHOOTING

Use the following subsections to verify and test the fan motor control (A177).

Verifying Jumper Settings (J2)

The unit is shipped from the factory with the default fan motor speed setting (in RPMs) required for each specific model. Use table 14 for one−stage to verify that the jumpers are set correctly for the specific unit.

Verifying LED Status Codes

During start up, the fan motor control LED will display any error conditions. If error conditions exist then no other codes will display. If no error conditions are present, then the stage status and and RPM indicator are displayed. Fan motor speeds are not adjustable for

a single stage outdoor unit (see table 14).

Verifying Correct DC Output Voltage (J2)

The following three methods can be used to determine whether the fan motor (B4) is operating at the correct RPMs based on unit size.

1. Use the information provided in tables 14 to verify that all four jumper terminals are set correctly for the specific size unit.

2. Verify LED RPM indicator is displaying the correct flash sequence for the applicable size unit (see table 14).

3. Test DC voltage output on the fan motor control’s J2 terminals (see figure 21) while the motor is under full load. The actual voltage tested should match the voltage listed in table 14 for the specific unit.

4. If no voltage is detected at the J2 terminals, verify there is a Y1 demand at the thermostat.

If there is a demand, proceed to the next section for further testing.

Verifying Correct Input Voltage (ECM/Y1,

ECM/Y2, ECM C and EXT ECM/R)

Using a voltmeter, check voltages on the following fan motor control inputs using table 11. Voltage will only be present during a thermostat demand. See figure 22 for test example.

If correct voltages are detected at applicable inputs during a demand, and no voltage is present at the J2 terminals, then fan motor control should be replaced.

Table 11. Fan Motor Control Voltage Inputs

Input

Thermostat Demand

Voltage Present

ECM/Y1 and ECM C

YES 24VDC

NO NONE

EXT ECM/R and ECM C

YES 24VAC

NO NONE

Page 42

XC17

Table 12. Fan Motor Control Flash and Pause Durations

Flash or Pause State Duration

Flash Flash Three flashes per second

Slow Flash One flash per second

Short Pause Two seconds of OFF time.

Long Pause Five seconds of OFF time.

Table 13. Fan Motor Control (A177) Error/Fault LED Codes

Unit Status Fan Motor Control LED Possible Cause

Mismatched RPM Fast Flash with no pause Internal feedback, PWM does not match target.

CRC Failure Constant ON. Microcontroller CRC failure.

Table 14. One Stage  Fan Motor Control RPM Jumper Settings, LED RPM Indicator and P2 DC Voltage Outputs

Model

CFM Profile Pin Select ECM1/Y1

LED Code*

4 3 2 1 RPM (J2) DC Volt

XC17−024 OFF ON ON ON 400 12.7 5

XC17−030 OFF ON ON OFF 450 14.3 6

XC17−036, −042 OFF OFF ON ON 600 19.2 8

XC17−048, −060 OFF OFF OFF ON 675 21.6 9

* LED Code indicates Fan Motor Control LED flash sequence. For example, LED Code 9 indicates 9 slow flashes and pause.

Table 15. Fan Motor Control Unit LED Codes

Unit Status Unit Status Fan Motor Control LED

One Stage Operation Low Stage  ECM1/Y1 ONLY One slow flash, then short pause.

RPM Indicator

NOTE  There is a long pause between stage operation and RPM indicator. See tables 1 and 2 for LED RPM indicator.

RPM Indicator

Appropriate number of flashes (see tables

14).

Flash Flash = Three flashes per second. Slow Flash = One flash per second. Short Pause = Two seconds of OFF time. Long Pause = Five seconds of OFF time.

DEMAND

BEGINS

MISMATCHED

RPM

DEFAULT FAN

MOTOR SPEED

USED

LED CONTINUOUS FAST

FLASH

REPLACE FAN MOTOR

CONTROL BOARD

CRC FAILURE

DEFAULT FAN

MOTOR SPEED

USED

LED CONSTANT ON

REPLACE FAN MOTOR

CONTROL BOARD

SINGLE STAGE

OR EDA

OPERATION

ECM1/Y1

ONLY OR

ECM2/Y2

ONLY

STAGE LED INDICATOR: ONE SLOW FLASH AND ONE SHORT PAUSE FOR SINGLE STAGE OR EDA OPERATION

LED RPM INDICATOR: EXAMPLE: (2−TON

UNIT) – 5 SLOW FLASHES AND ONE

LONG PAUSE

DEMAND

ENDED

YES

FAN MOTOR

RPM SET PER

JUMPER

SETTINGS

Figure 20. Fan Motor Control One Stage LED Sequence of Operation

Page 43

XC17

AIR

CONDITIONER

CONTROL (A175)

CONTROL BOX

FAN MOTOR CONTROL (A177) 

PULSE−WIDTH MODULATION (PWM)

JUMPER

OFF

JUMPER

LED

CFM Profile Pin Select

VERIFY DC VOLTAGE OUTPUT USING FAN PWM OUT AND COM TERMINALS. SEE TABLE 14 FOR OPTIMAL DC VOLTAGE BASED ON CFM PROFILE USED.

COM

FAN PWM OUT

PARK

COM

GREEN

RED

BROWN

RED

BLACK

RED

GREEN

FAN MOTOR

CONTROL

YELLOW

BLACK

YELLOW

BLUE

SEE TABLE 14 FOR CFM PROFILE SELECTION OPTIONS.

YELLOW

HIGH PRESSURE SWITCH (S4)

YELLOW

B4 FAN MOTOR

AIR CONDITIONER CONTROL

Figure 21. Fan Motor Control, Wiring, Jumper Settings, Testing and LED Location

Page 44

XC17

AIR

CONDITIONER

CONTROL (A175)

CONTROL BOX

FAN MOTOR CONTROL (A177) 

PULSE−WIDTH MODULATION (PWM)

ONE YELLOW WIRE FROM PS (E24) TERMINAL ON AIR

CONDITIONER CONTROL. AND SECOND YELLOW WIRES ON

PIGGYBACK TERMINALS GOES TO S4 HIGH PRESSURE SWITCH.

GREEN

RED

BROWN

RED

BLACK

RED

GREEN

FAN MOTOR

CONTROL

YELLOW

BLACK

YELLOW

BLUE

SEE TABLE 14 FOR CFM PROFILE SELECTION OPTIONS.

BLACK WIRE

YELLOW WIRE

VAC

VDC

EXT PWR/R (24VAC INPUT

DURING DEMAND ONLY)

BLUE WIRE

YELLOW

S4 HIGH PRESSURE SWITCH

YELLOW

AIR CONDITIONER CONTROL

B4 FAN MOTOR

INPUT VOLTAGES DURING DEMAND

ECM/Y1 ONLY − 24VDC

Figure 22. Testing for External Power to Fan Motor Control

Page 45

XC17

Fan Motor (B4) Test Procedure

A simple test can be used to test the fan motor operation. A fully charged 9V battery will be required for this procedure.

FAN PWM OUT

PARK

COM

BLACK LEAD

BROWN LEAD

BLACK LEAD

REMOVE BOTH LEADS

FROM J2 TERMINALS

CONNECT FAN MOTOR BLACK

COMMON WIRE TO 9V BATTERY

NEGATIVE TERMINAL

FAN MOTOR CONTROL (A177)

BLACK LEAD

BROWN LEAD

FAN MOTOR TEST

FULLY CHARGED 9V BATTERY

THIS IS A TEST THAT WILL VERIFY THAT THE MOTOR DOES OPERATE.

1. VERIFY MAIN (240 VOLT) POWER IF OFF TO UNIT.

2. REMOVE BOTH WIRES (BROWN AND BLACK) FROM THE J2 TERMINAL ON THE FAN MOTOR CONTROL (A177).

3. ROOM THERMOSTAT SHOULD BE IN OFF POSITION (UNIT IN IDLE MODE − NO HEATING OR COOLING DEMANDS)

4. TURN MAIN POWER (240 VOLT) ON TO UNIT.

5. CONNECT 9 VOLT BATTERY TO FAN MOTOR PLUGS AS NOTED IN PICTURE BELOW.

6. FAN MOTOR SHOULD RUN AT A REDUCED FAN SPEED.

7. IF FAN MOTOR DOES NOT RUN, THEN REPLACE FAN MOTOR ASSEMBLY.

NEGATIVE TERMINAL POSITIVE TERMINAL

CONNECT FAN MOTOR WIRE TO 9V BATTERY POSITIVE TERMINAL

Figure 23. Fan Motor (B4) Test

Page 46

XC17

TOP GRILLE OR FAN MOTOR MOUNT ADJUSTMENT FOR FAN CLEARANCE

Sometimes during shipping, either the fan motor mounting or top grille may become out of alignment. This may cause the fan motor blade to not clear the orifice ring. If this situation occurs, simply adjust either or both the fan motor mount or top grille positions to allow proper clearance. The top grille four fastener insertion points to the plastic top and motor mount locations are larger than the fasteners used to secure the grille and fan motor mounts. Use the procedures provided in figure 24 to adjust for fan clearance.

GRILLE MOUNTING

POINTS

GRILLE MOUNTING POINTS

FASTENER INSERTION POINT

FAN MOTOR MOUNTING POINTS

PUSH

FORWARD

PUSH

FORWARD

THE FOUR MOUNTING POINT HOLES THAT SECURE THE TOP GRILLE TO THE PLASTIC TOP ARE LARGER THAN THE FASTENERS USED TO SECURE THE GRILLE. THIS IS ALSO TRUE FOR THE FOUR FASTENERS SECURING THE FAN MOTOR TO THE TOP GRILLE. TO PROVIDE MORE CLEARANCE, PREFORM EITHER OR BOTH OF THE FOLLOWING PROCEDURES.

TOP GRILLE ADJUSTMENT

1. LOOSEN THE FOUR GRILLE MOUNTING FASTENERS AND PUSH THE GRILLE FORWARD. TIGHTEN MOUNTING HARDWARE. IF THERE IS STILL INSUFFICIENT CLEARANCE PROCEED TO STEP 2.

FAN MOTOR POSITION ADJUSTMENT

2. LOOSEN THE FOUR FAN MOTOR GRILLE MOUNTING FASTENERS AND PUSH THE FAN MOTOR FORWARD. TIGHTEN MOUNTING HARDWARE.

ORIFICE RING

Figure 24. Fan Blade Clearance Adjustment

FAN MOTOR SURGE PROTECTION (XC17−XXX−223−01 and −02 builds only)

Surge Protector (Metal Oxide Varistor − MOV) − A part

designed to protect electrical devices from voltage spikes that are 3 to 4 times the normal circuit voltage (See figure 25 for illustration of component).

An MOV works as follows: It is essentially a batch of metallic−oxide grains separated by insulating layers. Repeated voltage surges break down the insulating layers, lowering the overall resistance and eventually causing the device to draw too much current and trip whatever over−current protection is inherent in the system)

MOV Check: They are supposed to be located beyond the line fuse (though possibly not always). In this case, where the line fuse blows or circuit breaker trips but there is no visible damage to the MOV(s), the simplest test may be to just temporarily remove the MOV(s) and see if the problem goes away.

See figure 1 for location of the surge protections device which is located in the unit control box area. Note that in

some units, the surge protection device was not used.

Figure 25. Fan Motor Surge Protection Device (−01

and 02 builds only)

Page 47

XC17

SETTING UNIT NOMINAL CAPACITY CODE

In a icomfortt enabled system, if the icomfort Toucht thermostat is displaying either of the following alert codes, then the outdoor unit normal capacity will need to be set using the procedures outlined in figure 26.

1. Alert Code 34, Must Program Unit Capacity for Outdoor Unit.

2. Alert Code 313, Indoor and Outdoor Unit Capacity

Mismatch.

When the required Unit Capacity Code is displaying on the LEDs, remove FIELD TEST jumper from pins (E33). LEDs will continue to display the selected unit capacity code for two (2) minutes before defaulting back to the idle mode {simultaneous slow flash}, or until the 24 volt

power is cycled to the air conditioner control.

START

Set room thermostat

to OFF

Go to air conditioner control terminal strip

Remove R wire

from air conditioner

control (24 volt AC

power)

icomfort® enabled 

Remove control wires

from i+ and i− terminals

Non − icomfort

enabled  Remove

control wire from Y1

terminal

Place jumper on

FIELD TEST

(E33 pins)

Connect R wire to air

conditioner control (24

volt AC power)

DS14 (Red)

DS11 (Green)

TERMINAL STRIP

Status LED lights DS11

and DS14 will blink and

then on continuously.

The lights must be on

continuously to proceed

to the next step.

Place jumper on FIELD

TEST (E33 pins) within 2 to

10 seconds after removal

Remove jumper

from FIELD

TEST (E33 pins)

between 2 to 10

seconds.

The air conditioner control´s DS11 and DS14 LEDs will start blinking the Unit Nominal Code at three (3) second intervals starting at 1−ton through to 6−ton. If a code is not selected, the air conditioner control will cycle one more time through the codes before defaulting back to the idle mode (simultaneous slow flash).

Long blink ON red LED (DS14) to indicate tonnage and solid ON green LED (DS11) to indicate ½ tonnage.

Model

DS11 Green LED

Size

DS14 Red LED

−012

−018

−024

−030

−036

−042

−048

−054

−060

−066

−072

1−ton

1.5−ton

2−ton

2.5−ton

3−ton

3.5−ton

4−ton

4.5−ton

5−ton

5.5−ton

6.0−ton

OFF

1 long flash

2 long flashes

3 long flashes

4 long flashes

5 long flashes

6 long flashes

FINISH

Field Test

(E33)

DS12 Communicating Status Indicator

Sensor harness must be attached to air conditioner control.

Remove R wire from

air conditioner control

(24 volt AC power)

Connect R wire to air

conditioner control (24

volt AC power)

Reconnect any control

wiring previously

removed.

Figure 26. Air Conditioner Control (A175) Unit Nominal Capacity Code Configuration

Page 48

XC17

Routine Maintenance

DEALER

Outdoor Unit

Maintenance and service must be performed by a qualified installer or service agency. At the beginning of each cooling season, the system should be checked as follows:

1. Clean and inspect outdoor coil (may be flushed with a water hose). Ensure power is off before cleaning.

2. Outdoor unit fan motor is pre−lubricated and sealed. No further lubrication is needed.

3. Visually inspect all connecting lines, joints and coils for evidence of oil leaks.

4. Check all wiring for loose connections.

5. Check for correct voltage at unit (unit operating).

6. Check amp draw on outdoor fan motor.

Motor Nameplate:_________ Actual:__________.

7. Inspect drain holes in coil compartment base and clean if necessary.

NOTE - If insufficient heating or cooling occurs, the unit should be gauged and refrigerant charge should be checked.

Outdoor Coil

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, fertilizers, fluids that may contain high levels of corrosive chemicals such as salts)

S Outdoor Coil  The outdoor coil may be flushed with a

water hose.

S Outdoor Coil (sea coast)  Moist air in ocean locations

can carry salt, which is corrosive to most metal. Units that are located near the ocean require frequent inspections and maintenance. These inspections will determine the necessary need to wash the unit including the outdoor coil. Consult your installing contractor for proper intervals/procedures for your geographic area or service contract.

Indoor Unit

1. Clean or change filters.

2. Lennox blower motors are prelubricated and permanently sealed. No more lubrication is needed.

3. 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.

4. Belt Drive Blowers − Check belt for wear and proper tension.

5. Check all wiring for loose connections.

6. Check for correct voltage at unit. (blower operating)

7. Check amp draw on blower motor.

Motor Nameplate:_________ Actual:__________.

Indoor Coil

1. Clean coil if necessary.

2. Check connecting lines, joints and coil for evidence of oil leaks.

3. Check condensate line and clean if necessary.

WARNING

This product and/or the indoor unit it is matched with may contain fiberglass wool.

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 shown below, or contact your supervisor.

Lennox Industries Inc. P.O. Box 799900 Dallas, TX 75379−9900

Accessories

For update−to−date information, see any of the following publications:

S Lennox XC17 Engineering Handbook S Lennox Product Catalog S Lennox Price Book

Page 49

XC17

SunSource® Home Energy System

This Dave Lennox Signature® Collection heat pump is factory−equipped with components that make it SunSource

solar−ready. These units can be matched with

solar modules and other optional equipment so that they can become part of a SunSource

Home Energy System.

Units can be upgraded for use with solar equipment at the time of installation or in the future.

Solar energy is first used to meet cooling/heating demands. When the outdoor unit is not operating, the system powers lighting, appliances and other electronic devices in the home. Any surplus power is sent back to the utility company for a possible credit (check with your local utility company for availability).

The SolarSynct package consists of the following components:

S Lennox

Solar Subpanel installed in a Dave Lennox

Signature

Collection air conditioner or heat pump

unit.

S Solar modules (1 to 15 may be used to vary the amount

of electricity generated).

S Envoy Communications Gateway monitors solar power

performance.

All components must be ordered separately. See the Lennox XC17 Engineering Handbook for SunSource

Home Energy System component ordering.

Wiring runs from the roof−mounted solar modules to the outdoor unit. From there, power travels to the home electrical service panel using the existing outdoor unit power wiring.

Page 50

XC17

Start−Up and Performance Checklist

Customer Address

Indoor Unit Model Serial

Outdoor Unit Model Serial

Notes:

START UP CHECKS

Refrigerant Type _________

Rated Load Amps __________ Actual Amps Rated Volts Actual Volts

Condenser Fan Full Load Amps Actual Amps:

COOLING MODE

Suction Pressure: Liquid Pressure:

Supply Air Temperature: Ambient Temperature: Return Air: Temperature:

System Refrigerant Charge (Refer to manufacturer’s information on unit or installation instructions for required subcooling and approach temperatures.)

Subcooling:

A  B = SUBCOOLING

Saturated Condensing Temperature (A)

minus Liquid Line Temperature (B)

Approach:

A  B = APPROACH

Liquid Line Temperature (A)

minus Outdoor Air Temperature (B)

Indoor Coil Temperature Drop (18 to 22°F)

A  B = COIL TEMP DROP

Return Air Temperature (A)

minus Supply Air Temperature (B)

Page 51

XC17

Unit Wiring Diagrams

Service technician will need to visually inspect the unit being service to determine which wiring diagram is applicable. Quick verification can usually be made by comparing the wiring diagram located on the unit access panel to the following diagrams.

Figure 27. Typical XC17 Wiring (Non−communicating − Original) (XC17−XXX−230−01)

Page 52

XC17

Figure 28. Typical XC17 Wiring (Non−Communicating with Fan Motor Surge Protection) (XC17−XXX−230−01)

Page 53

XC17

Figure 29. Typical XC17 Wiring (Non−Communicating, No Surge Protection and A177 Fan Motor Control Wiring

Change) (XC17−XXX−230−01)

Page 54

XC17

Figure 30. Typical XC17 Wiring (Communicating, Surge Protection and A177 Fan Motor Control Wiring Change)

(XC17−XXX−230−02)

Page 55

XC17

Figure 31. Typical XC21 Wiring − No External Surge Protection (XC17−XXX−230−03)

Page 56

XC17

Unit Sequence of Operations

The following figures illustrated the overall unit sequence of operations along with various pressure switches and temperature sensor operations. The figures also illustration the use of the compressor anti−short cycle function in relations to unit Status, Fault and Lockout LED Codes system operations interaction.

On 24VAC power−up or air conditioner control (A175) reset, the air conditioner control shall perform the following tasks:

1. Start the anti−short cycle delay.

2. Check temperature sensor and pressure switches at the start of cooling demand.

3. Air Conditioner control responds to the thermostat input after the anti−short cycle timer expires. If there is no thermostat input, control goes to standby mode.

Air conditioner control receives cooling input.

The air conditioner control (A175) will apply:

1. 24VAC to compressor contactor output Y1 OUT..

2. Output between 24 and 32 VDC on air conditioner control’s ECM fan terminals ECM Y1 FAN and ECM C.

NOTE − If low pressure switch is closed, system will ignore for 90 seconds.

The outdoor fan control (A177) will:

Receive the DC voltage signal from the outdoor control (A175) and converted the signal to a pulse width modulation (PWM) signal. Jumper settings will determine fan PWM OUT fan speed.

NOTE  Refer to table 14 for jumper settings.

For low pressure (S87) and high (S4) switches sequence of operations, see figures 33 and 34.

For temperature switch RT28 sequence of operations, see figure

35.

Figure 32. One−Stage Cooling Unit Sequence of Operation

Page 57

XC17

Y1 DEMAND

LOW

PRESSURE

SWITCH (S87)

COMPRESSOR

CONTACTOR

ENERGIZED

INITIAL TRIP

SWITCH IS

IGNORED FOR

90 SECONDS

LOW

PRESSURE

SWITCH (S87)

COMPRESSOR

CONTACTOR

DE−ENERGIZED

COMPRESSOR

ANTI−SHORT

CYCLE TIMER

BEGINS

INCREMENT

5−STRIKE

COUNTER

LED ALERT

CODE / OR

MODERATE

ALERT 410

DISPLAYED

ANTI−SHORT

CYCLE TIMER

ENDS

COMPRESSOR

CONTACTOR

ENERGIZED

LOW

PRESSURE

SWITCH (S87)

WAITING FOR

PRESSURE

SWITCH TO

SWITCH IS CLOSED OR OUTDOOR

AMBIENT TEMPERATURE IS 15ºF

OR BELOW

5−STRIKE

COUNTER

REACHES 5

WITHIN A SINGLE

Y1 DEMAND

LOW

PRESSURE

SWITCH (S87)

LOCKOUT

LED ALERT

CODE / OR

CRITICAL

ALERT 411

DISPLAYED

SERVICE

REQUIRED

LED ALERT CODE / OR

MODERATE

ALERT 410

DISPLAYED

SERVICE

REQUIRED

NORMAL

OPERATION

CLOSED

OPEN

If 5−strike counter has four or less strikes when Y1 demand is terminated or satisfied, the strike counter will reset to zero. In a icomfort Toucht enabled setup, the thermostat will terminate demand when the compressor contactor is de−energized. If demand is satisfied when alarm is not active, the 5−strike counter will reset.

Lockouts can be reset by either cycling power off to the air conditioner control’s (A175) R terminal, or placing a jumper on the field test pins (E33) between 1 to 2 seconds.

OPEN

CLOSED

Figure 33. Low Pressure Switch (S87) Sequence of Operation

Page 58

XC17

Y1 DEMAND

HIGH

PRESSURE

SWITCH (S4)

COMPRESSOR

CONTACTOR

ENERGIZED

HIGH

PRESSURE

SWITCH (S4)

COMPRESSOR

CONTACTOR

DE−ENERGIZED

COMPRESSOR

ANTI−SHORT

CYCLE TIMER

BEGINS

INCREMENT

5−STRIKE

COUNTER

LED ALERT

CODE / OR

MODERATE

ALERT 412

DISPLAYED

ANTI−SHORT

CYCLE TIMER

ENDS

COMPRESSOR

CONTACTOR

ENERGIZED

HIGH

PRESSURE

SWITCH (S4)

WAITING FOR

PRESSURE SWITCH TO

5−STRIKE

COUNTER

REACHES 5

WITHIN A SINGLE

Y1 DEMAND

HIGH

PRESSURE

SWITCH (S4)

LOCKOUT

LED ALERT

CODE / OR

CRITICAL

ALERT 413

CLEARED

SERVICE

REQUIRED

LED ALERT

CODE / OR

MODERATE

ALERT 412

DISPLAYED

SERVICE

REQUIRED

NORMAL

OPERATION

CLOSED

OPEN

If 5−strike counter has four or less strikes when Y1 demand is terminated or satisfied, the strike counter will reset to zero. In a icomfort Toucht thermostat enabled setup, the thermostat will terminate demand when the compressor contactor is de−energized. If demand is satisfied when alarm is not active, the 5−strike counter will reset.

Lockouts can be reset by either cycling power off to the air

conditioner control’s (A175) R terminal, or placing a jumper on the field test pins (E33) between 1 to 2 seconds.

OPEN

CLOSED

Figure 34. High Pressure Switch (S4) Sequence of Operation

Page 59

XC17

Y1 DEMAND

DISCHARGE

SENSOR

(RT28)*

COMPRESSOR

CONTACTOR

ENERGIZED

HIGH

PRESSURE

SWITCH (S4)

COMPRESSOR

CONTACTOR

DE−ENERGIZED

COMPRESSOR

ANTI−SHORT

CYCLE TIMER

BEGINS

INCREMENT

5−STRIKE

COUNTER

LED ALERT

CODE / OR

MODERATE

ALERT 414

DISPLAYED

ANTI−SHORT

CYCLE TIMER

ENDS

COMPRESSOR

CONTACTOR

ENERGIZED

DISCHARGE

SENSOR (RT28)

IS AT OR

BELOW 225ºF

WAITING FOR

TEMPERATURE

DROP TO OR

BELOW 225ºF

5−STRIKE

COUNTER

REACHES 5

WITHIN A SINGLE

Y1 DEMAND

DISCHARGE

SENSOR (RT28)

LOCKOUT

LED ALERT

CODE / OR

CRITICAL

ALERT 415

CLEARED

SERVICE

REQUIRED

LED ALERT

CODE / OR

MODERATE

ALERT 414

CLEARED

NORMAL

OPERATION

CLOSED

OPEN

Lockouts can be reset by either cycling power off to the air conditioner control’s (A175) R terminal, or placing a jumper on the field test pins (E33) between 1 to 2 seconds.

If temperature is at or above 279ºF.

YES

Figure 35. High Discharge Temperature Sensor (RT28) Sequence of Operation

Lennox XC17-030-230-01, XC17-024-230-01, XC17-024-230-02, XC17-024-230-03, XC17-030-230-02 Unit Information

Specifications and Main Features

Frequently Asked Questions

User Manual