Lennox GHR32Q Unit Information
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Lennox GHR32Q Unit Information

Lennox GHR32Q Unit Information

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Service Literature
This manual contains information pertaining to
GHR32−1 through −6 model units. GHR32 series units
are high−efficiency horizontal or down flow gas furnaces
manufactured with Lennox DuralokPlust aluminized and
stainless steel clamshell-type heat exchangers. GHR32Q
units are available in heating input capacities of 50,000 to
120,000 Btuh (14.7 to 35.2 kW) and cooling applications
from 2 through 5 tons (7.0 through 17.6 kW). GHR32V units
are available in heating capacities of 75,000 and 100,000 Btuh
(22.0 and 29.3 kW) and 3 and 5 tons (10.5 and 17.5) for cool-
ing. Refer to Engineering Handbook for proper sizing.
Units are factory equipped for use with natural gas. A kit is
available for conversion to LPG operation. GHR32−1
through −4 units are equipped with the Lennox SureLight
silicon nitride ignition system. GHR32−5 units are
equipped with the two stage (V models will have the vari-
able speed control) integrated control board. Each
GHR32 unit meets the California Nitrogen Oxides (NO
Standards and California Seasonal Efficiency require-
ments. The gas valve is redundant to assure safety
shut−off as required by A.G.A. and C.G.A.
The heat exchanger, burners and manifold assembly can be
removed for inspection and service. The maintenance section
gives a detailed description on how this is done.
Information contained in this manual is intended for
use by qualified service technicians only. All specifica-
tions are subject to change. Procedures outlined in this
manual are presented as a recommendation only and do
not supersede or replace local or state codes.
General
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Blower performance V Models
Parts Arrangement
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GHR32Q/V SERIES UNITS

TABLE OF CONTENTS

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DOWN FLOW
POSITION
GHR32Q MODEL SHOWN
VII Wiring Diagram and Sequence of Operation
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VIII Operating Flow Charts
X Blower Control Board Jumper Summary
Page 1
GHR32Q/V
Corp. 0001−L2
Revised 08−2004
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© 2000 Lennox Industries Inc.
Litho U.S.A.
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Summary of Contents for Lennox GHR32Q

  • Page 1: Table Of Contents

    Units are factory equipped for use with natural gas. A kit is available for conversion to LPG operation. GHR32−1 through −4 units are equipped with the Lennox SureLight silicon nitride ignition system. GHR32−5 units are equipped with the two stage (V models will have the vari- able speed control) integrated control board.

  • Page 2: Specifications Q Models

    SPECIFICATIONS GHR32Q MODELS Model No. GHR32Q2/3-50 GHR32Q3-75 GHR32Q4/5-100 GHR32Q4/5-120 High Fire 50,000 (14.7) 72,000 (21.1) 100,000 (29.3) 118,000 (34.6) Input Input Btuh (kW) Btuh (kW) Low Fire 34,000 (10.0) 51,000 (14.9) 68,000 (19.9) 81,600 (23.9) High Fire 47,000 (13.8) 67,000 (19.6) 93,000 (27.2)

  • Page 3: Blower Performance Q Models

    BLOWER PERFORMANCE DATA Q MODELS GHR32Q2/3-50 BLOWER PERFORMANCE Air Volume and Motor Watts at Specific Blower Taps External Static External Static Pressure High Medium-High Medium-Low in. w.g. Watts Watts Watts Watts 1480 1330 1070 1430 1290 1050 1380 1240 1040 1320 1200 1010...

  • Page 4: Specifications V Models

    SPECIFICATIONS GHR32V MODELS Model No. GHR32V3-75 GHR32V5-100 High Fire 72,000 (21.1) 100,000 (29.3) Inp t Input Bt h (kW) Btuh (kW) Low Fire 51,000 (14.9) 68,000 (19.9) High Fire 67,000 (19.6) 93,000 (27.2) O tp t Output Bt h (kW) Btuh (kW) Low Fire 47,000 (13.8)
  • Page 5 NOTE − Continuous Fan only speed is approximately 825 cfm (390 L/s) − non adjustable. NOTE − Lennox Harmony IIt zone control applications − MAX CFM is determined by COOL jumper placement with a minimum of approximately 875 cfm (415 L/s) for all positions.
  • Page 6 NOTE − Continuous Fan only speed is approximately 825 cfm (390 L/s) − non adjustable. NOTE − Lennox Harmony IIt zone control applications − MAX CFM is determined by COOL switch setting with a minimum of approximately 875 cfm (415 L/s) for all positions.
  • Page 7 SECONDARY LIMIT GHR32Q−5 PARTS IDENTIFICATION AUTO−RESET (Downflow Application Shown) (Located on Backside BACK FILTER of Blower Wrapper) CLIP SURELIGHT TWO−STAGE SUPPLY AIR INTEGRATED CONTROL BLOWER TOP CAP CONTROL VOLTAGE CIRCUIT BREAKER CONTROL CABINET CONTROL TRANSFORMER CONTROL BOX COVER DOOR INTERLOCK SWITCH...

  • Page 8: I Unit Components

    I−UNIT COMPONENTS INTERIOR MAKE−UP BOX INSTALLATION GHR32 unit components are shown in figure 1. The com- MAKE−UP bustion air blower, gas valve and burners can be accessed by removing the burner access panel. The blower and con- trol box can be accessed by removing the blower access door.
  • Page 9 B−Control Box (Figure 6) CIRCUIT BREAKER CB8 ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures CAUTION PRESS TO RESET Electrostatic discharge can affect electronic components. Take precautions during furnace installation and service to protect the furnace’s FIGURE 7 electronic controls. Precautions will help to avoid 3.Door Interlock Switch (S51) control exposure to electrostatic discharge by A door interlock switch rated 14 amps at 125VAC is located...
  • Page 10 TABLE 1 SURELIGHT IGNITOR SureLight BOARD J156 (J2) TERMINAL DESIGNATIONS MEASUREMENT IS TO I.D. 5/8" OF RETENTION RING PIN # FUNCTION Ignitor 13/32’ Not Used Ignitor Neutral Combustion Air Blower Line Voltage Not Used FRONT VIEW Combustion Air Blower Neutral TABLE 2 SureLight BOARD J58 (J1) TERMINAL DESIGNATIONS...

  • Page 11: Diagnostic Codes

    TABLE 4 DIAGNOSTIC CODES MAKE SURE TO ID LED’S CORRECTLY: REFER TO INSTALLATION INSTRUCTIONS FOR CONTROL BOARD LAYOUT. LED #1 LED #2 DESCRIPTION Power − Normal operation SIMULTANEOUS SIMULTANEOUS SLOW FLASH SLOW FLASH Also signaled during cooling and continuous fan. SIMULTANEOUS FAST SIMULTANEOUS FAST Normal operation −...
  • Page 12 c−Flame Sensor 5. Two−Stage Control (A86) A flame sensor is located on the left side of the burner sup- All GHR32−1 through −4 units are equipped with a two− stage control board. Two different boards have been used. port. See figure 11. The sensor is mounted on a bracket in Boards 43K9001 and 29M9201 (figure 14) are identical, the burner support and the tip protrudes into the flame en- except the 9 pin connector on 43K9001 is replaced by two...
  • Page 13 6.VSP2−1 Blower Control Board (A24) TWO−STAGE CONTROL BOARD −1 through −3 V Models only G32(V) −1 through −4 units GHR32V−1 through −3 units are equipped with a variable speed motor that is capable of maintaining a specified CFM throughout the external static range. The unit uses the VSP2−1 variable speed control board, located in the blow- W2 TIMED er compartment, which controls the blower speed and...
  • Page 14 VSP2−1 BLOWER CONTROL BOARD (A24) IMPORTANT 24 VAC half wave rectified (DC pulse), when mea- sured with a meter, may appear as a lower or higher voltage depending on the make of the meter. Rather HIGH ADJUST HEAT than attempting to measure the output voltage of the TEST VSP2 board, see GHR32 BLOWER &...
  • Page 15 NOTE−On Harmony II zoning applications in the heating not operable. Notice in the GHR32V5−100 table, that the mode, the highest speed obtainable is the same as the highest normal adjustment setting for heat speed position #3 is 2150 CFM (1015L/s). After the adjustment setting has been cooling speed selection.
  • Page 16 NOTE If fan OFF" time is too low, residual heat in heat FAN-OFF TIME ADJUSTMENT exchanger may cause primary limit S10 to trip resulting TIMING in frequent cycling of blower. If this occurs, adjust blow- To adjust fan−off timings: JUMPER Remove jumper from VSP2−1 and select er to longer time setting.
  • Page 17 The VSP3−1 also senses limit trip condition and turns on the 7.VSP3−1 Blower Control Board (A24) GHR32V−4 Units blower. The GHR32V limit switch is located in the middle of the vestibule wall. When excess heat is sensed in the heat ex- GHR32V−4 units are equipped with a variable speed motor changer, the limit switch will open and interrupt the current that is capable of maintaining a specified CFM throughout...
  • Page 18 IMPORTANT VSP3−1 BLOWER CONTROL BOARD (A24) 24 VAC half wave rectified (DC pulse), when measured with a meter, may appear as a lower DELAY COOL ADJUST HEAT or higher voltage depending on the make of the TEST meter. Rather than attempting to measure the −...
  • Page 19 HTG. BLOWER Jumper Settings For GHR32V−4 units only, place the HTG. BLOWER jump- SEE BLOWER PERFORMANCE TABLES AT FRONT er across the second and third pins (position #2). OF MANUAL FOR ANY REFERENCE TO CFM. NOTE − In Harmony II zoning applications, HTG. BLOWER jumper must be in position #2.
  • Page 20 #4 PIN JUMPERED COOL A − Motor runs at 50% for 1/2 minute. The cool jumper is used to set the blower speed to obtain B − Motor then runs at 82% for approximately 7−1/2 min- the required CFM as outlined in the blower performance utes.
  • Page 21 TABLE 9 GHR32V−4 UNITS WITH CCB1 & TWO−SPEED OUTDOOR UNIT OPERATING SEQUENCE Operating Sequence System Demand System Response System Thermostat *Relative Humidity ***Compressor Blower CFM Step Comments Condition Demand (EfficiencyPlus Lights) Speed (COOL) 55% of Acceptable (None) Compressor demand and indoor HIGH COOL Normal operation Normal operation...
  • Page 22 The combustion air inducer will operate on low speed and in- All GHR32Q units are equipped with the Lennox two− door blower will operate on low heat speed. After a field se- stage integrated SureLight control board.
  • Page 23 it will provide a 15−minute delay before second−stage heat TWO−STAGE INTEGRATED CONTROL BOARD is initiated. This switch is only activated when the thermo- stat selector jumper is positioned for SINGLE−stage ther- mostat use. Switch 4 − Cooling Fan off Delay − The fan on delay time LEDs of 2 seconds is not adjustable.
  • Page 24 TABLE 13 TABLE 14 Integrated Control Board 5 Pin Terminal Integrated Control Board 12Pin Terminal PIN # Function PIN # Function Ignitor Gas Valve 2nd Stage (High Fire) Combustion Air Inducer High Speed Second Stage Prove Switch Combustion Air Inducer Low Speed Not Used Combustion Air Inducer Neutral Ground...
  • Page 25 9.Two Stage Variable Speed Integrated Control (A92) GHR32V−5 Units The control can be utilized in two modes: SINGLE−STAGE All GHR32V−5 units are equipped with the Lennox two− thermostat or TWO−STAGE thermostat. The thermostat selection jumper E20, located just below dip switches 1 stage, variable speed integrated SureLight control board.
  • Page 26 TABLE 18 TW0−STAGE, VARIABLE SPEED INTEGRATED SureLight Board 12Pin Terminal Designation CONTROL BOARD PIN # Function Gas Valve 2nd. Stage (High Fire) Second Stage Pressure Switch DIAGNOSTIC SWITCHES LEDs 1 − 3 Not Used Ground JUMPER 24V Hot Primary Limit In Gas Valve 1st.

  • Page 27: Status Codes

    (2) second pauses. One blink equals roughly 100 CFM. DS7−ON indicaties the DS to R" jumper has not been cut. When the jumper is cut the system will be operating with LENNOX HARMONY IIt (See Harmony Installation Instructions) or YELLOW with the CCB1 Efficiency Plus control.
  • Page 28 Dip Switch Settings TABLE 23 Cooling Mode Blower Speeds Switches 1 and 2 − Blower Off Delay The blower−on delay of 45 seconds is not adjustable. The blower−off delay (time Speed Switch 5 Switch 6 that the blower operates after the heating demand has 1 −...
  • Page 29 GHR32V units manufactured before April 2003 GHR32V units manufactured April 2003 and later Ramping Option A (Factory Selection) Ramping Option A (Factory Selection) D Motor runs at 50% for 1/2 minute. S Motor runs at 50% for 30 seconds. D Motor then runs at 82% for approximately 7−1/2 min- S Motor then runs at 82% for approximately 7−1/2 min- utes.
  • Page 30 Switches 11 and 12 − Heating Mode Blower Speed On−Board Jumper W951 Switches 11 and 12 are used to select heating mode blower On−board jumper W951, which connects terminals R and O motor speed. The unit is shipped from the factory with the on the integrated control board, must be cut when the fur- dip switches positioned for medium low (2) speed indoor nace is installed in applications which include a heat pump...
  • Page 31 Table 28 Operating Sequence GHR32V−5, CCB1 and Two−Speed Outdoor Unit OPERATING MODE SYSTEM DEMAND SYSTEM RESPONSE System Thermostat *Relative Humidity ****Compressor Blower CFM Comments Condition Demand (EfficiencyPlus Lights) Speed (COOL) 55% of Compressor demand and indoor No demand. Acceptable HIGH COOL Normal operation Normal operation blower speed controlled by...
  • Page 32 COMBUSTION AIR BLOWER COMBUSTION AIR BLOWER MOTOR COLD HEADER (COLLECTOR) HOT END HEADER (COLLECTOR) BOX PRIMARY LIMIT GAS VALVE CONTROL (S10) MANIFOLD LENNOX DURALOKPlust HEAT EXCHANGER (Assembly) CLAMSHELL (Each Segment) CORBEL ORIFICE CUPS BURNER FLAME SENSOR ASSEMBLY BURNERS FLAME SIGHT...
  • Page 33 The burner is supported by the orifice and will easily INSULATING COVER (s) slide off for service. Each orifice and burner are sized specif- ically to the unit. Refer to Lennox Repair Parts Listing for cor- FIGURE 23 rect sizing information. A flame retention ring in the end of...

  • Page 34: Gas Valve

    5.Clamshell Heat Exchanger 7.Gas Valve GHR32 units use an aluminized steel primary and stain- The GHR32 uses a gas valve manufactured by White less steel secondary heat exchanger assembly. Table 30 Rodgers or Honeywell. The valve is two-stage internally redundant to assure safety shut−off. If the gas valve must shows how many heat exchanger clamshells are used be replaced, the same type valve must be used.
  • Page 35 Figures 29 and 30 show how gas valve manifold pressure NORMAL OPERATION (Natural Gas Units) changes as burner box pressure changes. The GHR32 is a self adjusting unit to maintain a constant output. 8.Combustion Air Prove Switch (S18) GHR32−1/−4 Units & (S102) GHR32−5 Units GHR32 series units are equipped with a differential pressure switch S18 or S102 located on either side of...
  • Page 36 TRIDELTA / HONEYWELL NEGATIVE (Metal/Plastic Construction) PRESSURE (Marked With "V") POSITIVE PRESSURE (Marked With "P") NEGATIVE PRESSURE (Marked With "−") POSITIVE PRESSURE (Marked With "+") TRIDELTA / HONEYWELL (All Metal Construction) TRIDELTA / HONEYWELL IS2 POSITIVE PRESSURE (NO NEGATIVE NEGATIVE PRESSURE Markings Electrical Terminal PRESSURE (gray side marked −")
  • Page 37 To troubleshoot the pressure switch, temporarily jumper the D−Blower Compartment (Figures 33 and 34) switch. The unit will not fire with pressure switch jumpered. Blower motor (B3), capacitor (C4), and secondary limit con- Therefore, the pressure switch must be bypassed after the trol (S21) are located in the blower compartment shown in combustion air blower is activated.
  • Page 38 1.Blower Motor (B3) and Capacitor (C4) GHR32V BLOWER MOTOR B3 GHR32Q Models SHAFT All GHR32Q model units use single phase direct drive blow- er motors. All motors are 120V permanent split capacitor motors to ensure maximum efficiency. See motor name- MOTOR plate or SPECIFICATIONS section for motor ratings.
  • Page 39 The motor controller is driven by the VSP2−1, VSP3−1 or Motor Start-Up two stage integrated SureLight control The VSP re- When B3 begins start-up, the motor gently vibrates back and ceives its demand (PWM signal or fixed 24 VAC or VDC forth for a moment.
  • Page 40 MOTOR SPEED CONTROL WITH D.C. PULSE-WIDTH MODULATION Motor speed is determined by the size of the electrical pulse sent to the motor windings. The longer the pulse, the faster the motor. OUTPUT FROM CONTROLLER TO MOTOR WINDINGS WINDINGS TURNED OFF WINDINGS TURNED ON Ç...
  • Page 41 External Operation (Speed Tap Priority) 4.Choke Coil (L13) Figure 39 shows the two quick-connect jacks (J48 and J49) A choke coil is used on all GHR32V units. The choke is which connect the motor to the GHR32V. Jack J48 is the located on the blower housing and is used to block radio fre- power plug and jack J49 connects the unit controls to the quency interference.

  • Page 42: Placement And Installation

    II−PLACEMENT AND INSTALLATION B−Venting Considerations All GHR32 furnaces must be vented independently as Make sure unit is installed in accordance with installation in- structions and applicable codes. shown in figure 42 and must not be connected to a com- mon venting system. If a GHR32 furnace replaces a less efficient furnace which was vented with other gas ap- A−PVC Joint Cementing Procedure pliances into a common vent, the size of the common vent...
  • Page 43 GHR32 Intake and Exhaust Piping Considerations 5 − Exhaust piping must terminate straight out or up as shown. On roof terminations, the intake piping should terminate straight down using two 90_ elbows If the GHR32 venting system must be altered or repaired, use (See figure 42).
  • Page 44 60G77 For 2 inch (51 mm) Venting METAL OR PLASTIC STRAPPING 33K97 For 3 inch (76 mm) Venting 2 x 1-1/2 in. (51 x 38 mm) 60G77 3 x 2 in. (76 x 51 mm) 33K97 REDUCER BUSHING (Furnished) (940) FIGURE 41 INTAKE AIR 3 (76)
  • Page 45 WALL TERMINATION KIT (RING KIT) NOTE 12 in. (305 mm) minimum height above average snow accumulation. 15F74 For 2 inch (51 mm) Venting NOTE Not for use with 3 inch (76 mm) Venting 12 in. (305 mm) maximum NOTE EXHAUST PIPE SHOWN 6 in.
  • Page 46 TABLE 31 VENTING REQUIREMENTS GHR32−120 Model No. GHR32−50 GHR32−75 GHR32−100 Vent Pipe Minimum Equivalent Length with Accelerator − Exhaust pipe should 20 ft. (6.1 m) 20 ft. (6.1 m) 15 ft. (4.6 m) 15 ft. (4.6 m) terminate with an accelerator. See Termination Kits, below. feet (m) Minimum Vent Pipe Diameter Required 15 (4.6)

  • Page 47: Start Up

    Condensate Piping Requirements 5 − Install a tee and vent pipe in the drain line near the trap. The GHR32 unit is designed for either left or right con- Top of vent pipe should be 7" (178mm) above drain densate plumbing in the down-flow configuration. In the level on trap.

  • Page 48: Heating System Service Checks

    Gas Leak Detector is strongly recommended. It is all gas valves (both internal and external to unit) to guaran- available through Lennox under part number 31B2001. tee no gas leak into combustion chamber. Turn off power to unit. All access panels, covers and vent caps must be in Do not use matches, candles, flame or any other source of place and secured.
  • Page 49 gas to the unit. Normal manifold operating pressure for natural gas units is 2.5 to 3.5" W.C. (621 to 870 Pa). See MANUAL MAIN SIDE figure 29. For LP/propane gas the correct manifold operat- SHUT−OFF PIPING ing pressure is 9.0 to 10.0" W.C. (2.24 to 2.49 Pa). See fig- VALVE ure 30.

  • Page 50: Typical Operating Characteristics

    Temperature rise for GHR32 units depends on unit input, blow- er speed, blower horsepower and static pressure as marked number 78H5401) available from Lennox to measure the on the unit rating plate. The blower speed must be set for unit flame signal, if meter used will not read microamp signal.
  • Page 51 C−External Static Pressure D−Blower Speed Taps GHR32Q Motors Blower speed tap changes are made on the SureLight con- 1 − Measure tap locations as shown in figure 49. trol board. See figure 9. Unused taps must be secured on 2 − Punch a 1/4" diameter hole in...

  • Page 52: Maintenance

    418 and is available as Lennox part no. P-8-5069. 14− Remove combustion air blower bracket by removing two 3 − If replacement is necessary, order Lennox part no. 31J81 screws from collector box and two screws from ves- tibule panel.
  • Page 53 19− Remove two (2) screws from the front cabinet flange at 30− Connect combustion air pressure and condensate the blower deck. Remove front screws from cabinet at sensing hoses from pressure switch to cold end blower deck on left and right sides. Cabinet sides must header collector box.
  • Page 54 Cleaning the Burner Assembly 18− Re−install gas valve/manifold assembly. Re−install burner box cover. Reconnect gas valve sensing hose 1 − Turn off electrical and gas power supplies to furnace. to side of burner box. Re−install gas supply line to gas 2 −...

  • Page 55: Ghr32Q−1

    VII−WIRING DIAGRAM AND SEQUENCE OF OPERATION GHR32Q −1 UNIT DIAGRAM Page 55...

  • Page 56: Ghr32Q−3

    GHR32Q −3 UNIT DIAGRAM Page 56...
  • Page 57 Two−stage Mode, Single−stage Thermostat Sequence of Operation GHR32Q −1, −3 Units 1 − SureLight control energizes combustion air inducer Ignitor operation will vary between SureLight boards. B6 on low speed. Combustion air inducer runs until Board 56L83 will energize ignitor for the first second of the combustion air proving switch S18 closes (switch will 4 second ignition trial.

  • Page 58: Ghr32Q−5

    GHR32Q −5 & −6 UNIT DIAGRAM Page 58...
  • Page 59 Single−Stage Thermostat, Two Stage Heat. Jumper Sequence of Operation. GHR32Q with E20 set at SINGLE" SureLight Two Stage Control 1− SureLight control energizes combustion air inducer B6 Sequence depends on type thermostat used. Units are on low heat speed. Combustion air inducer runs until applicable for single stage or two stage thermostats.

  • Page 60: Ghr32V−1

    GHR32V −1 UNIT DIAGRAM Page 60...

  • Page 61: Ghr32V−3

    GHR32V −3 UNIT DIAGRAM Page 61...

  • Page 62: Ghr32V−4

    GHR32V −4 UNIT DIAGRAM Page 62...
  • Page 63 Two−stage Mode, Single−stage Thermostat Sequence of Operation GHR32V −1 / −4 Units 1 − SureLight control energizes combustion air inducer Ignitor operation will vary between SureLight boards. B6 on low speed. Combustion air inducer runs until Board 56L83 will energize ignitor for the first second of the combustion air proving switch S18 closes (switch will 4 second ignition trial.

  • Page 64: Ghr32V−5

    GHR32V −5 & −6 UNIT DIAGRAM Page 64...
  • Page 65 Single−Stage Thermostat, Two Stage Heat. Jumper Sequence of Operation GHR32V with E20 set at SINGLE" SureLight Two Stage Variable Speed Control 1− SureLight control energizes combustion air inducer B6 Sequence depends on type thermostat used. Units are on low heat speed. Combustion air inducer runs until applicable for single stage or two stage thermostats.

  • Page 66: Heating Sequence Of Operation

    VIII−Sequence of Operation Flow Charts GHR32Q −1 & −3 GHR32V−1 / −4 HEATING SEQUENCE OF OPERATION NOTE: LED REFERS TO SURELIGHT CONTROL . LED−DS REFERS TO VSP CONTROL. NORMAL HEATING MODE ABNORMAL HEATING MODE GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
  • Page 67 HEATING SEQUENCE CONTINUED NORMAL HEATING MODE ABNORMAL HEATING MODE PREPURGE 15 SECONDS WATCHGUARD 60-MINUTE DELAY (SIGNAL LIMIT OR IGNITION FAILURE) GAS VALVE OFF. COMBUSTION AIR AND INDOOR BLOWER OFF. LED #1 AND LED #2 ALTERNATING SLOW FLASHES IGNITION SEQUENCE BEGINS (Ignition trial counter initiated.) WATCHGUARD −−...
  • Page 68 HEATING SEQUENCE CONTINUED NORMAL HEATING MODE ABNORMAL HEATING MODE PREPURGE (See top of previous page.) PRESSURE SWITCH CLOSED? GAS VALVE DE−ENERGIZED. INDOOR BLOWER DE−ENERGIZED. TWO−STAGE MODE W2 TIMED MODE COMBUSTION AIR INDUCER ON FOR 2.5 MINUTES. CALL FOR 1st STAGE HEAT SINGLE STAGE T’STAT 2nd STAGE ON DELAY PRESSURE SWITCH...
  • Page 69 COOLING SEQUENCE OF OPERATION NORMAL COOLING MODE ABNORMAL COOLING MODE POWER ON IGNITION CONTROL MAIN POWER ON. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF WITH NORMAL DELAY. CONTROL SELF DIAGNOSTIC CHECK. SIGNAL CIRCUIT BOARD FAILURE AT LED. IS CONTROL OPERATING NORMALLY? INTERRUPT MAIN POWER TO RESET CONTROL.
  • Page 70 CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION LED: SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT SEQUENCE. MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G)ENERGIZING ACC TERMINAL. Q" MODELS: ACB LOW SPEED ENERGIZED. V" MODELS: ON/OFF" LED−DS3 LIT. INDOOR BLOWER ENERGIZED ON LOW SPEED. HTG ACC TERMINAL ENERGIZES THERMOSTAT CALLS FOR HEAT (W).
  • Page 71 GHR32Q with Two Stage Control and GHR32V with Two Stage Variable Speed Control HEATING SEQUENCE OF OPERATION NORMAL AND ABNORMAL HEATING MODE GAS VALVE OFF. COMBUSTION AIR INDUCER POWER ON OFF. INDOOR BLOWER OFF. CHECK FOR BROKEN IGNITOR OR OPEN IGNITER CIRCUIT.
  • Page 72 HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT DS1 AND DS2 SIMULTANEOUS FAST FLASH (Refer to box A on previous page) PRESSURE SWITCH CLOSED WITHIN GAS VALVE OFF. COMBUSTION AIR INDUCER 2.5 MINUTES? OFF. INDOOR BLOWER OFF. UNIT WILL RETRY AFTER 5−MINUTE WAIT PERIOD.
  • Page 73 HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT. DS1 AND DS2 SIMULTANEOUS FAST FLASH. SEE BOX A. FLAME SIGNAL ABOVE (u0.23 microamps) LOW FLAME SIGNAL (Does not affect control operation) DS1 SLOW FLASH, DS2 FAST FLASH. SINGLE−STAGE THERMOSTAT MODE TWO STAGE THERMOSTAT MODE (E20 SET AT SINGLE") (E20 SET AT TWO")
  • Page 74 HEATING SEQUENCE OF OPERATION CONTINUED SEE BOX A NORMAL OPERATION DS1 AND DS2 SIMULTANEOUS SLOW FLASH. SEE BOX B THERMOSTAT CALLS FOR HEAT DS 1 AND DS 2 SIMULTANEOUS FAST FLASH. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER ON. ARE PRIMARY LIMIT AND ROLLOUT DS1 SLOW FLASH, DS2 ON, SWITCH CLOSED?
  • Page 75 COOLING SEQUENCE OF OPERATION POWER ON IS POLARITY REVERSED? SIGNAL POLARITY REVERSED. DS1 FAST FLASH, DS2 SLOW FLASH. SIGNAL IMPROPER GROUND AT DS. SIGNAL HOLDS IS THERE IS VOLTAGE LOW VOLTAGE SIGNAL AT DS HOLDS UNTIL UNIT IS PROPER GROUND? ABOVE 75 VOLTS? UNTIL VOLTAGE RISES ABOVE 75 VOLTS.
  • Page 76 INDOOR BLOWER RAMPS DOWN TO LOW COOL SPEED. HEAT SPEED. GHR32Q−5 UNITS NOTE − Continuous low speed fan and cooling low speed are equal to the low heat fan speed. MANUAL FAN SELECTION MADE AT THERMOSTAT. AFTER 2 SECOND DELAY, INDOOR BLOWER IS ENERGIZED ON CONTINUOUS FAN SPEED (LOW HEAT / LOW COOL).

  • Page 77: Troubleshooting

    IX− Troubleshooting SureLight Control UPON INITIAL POWER UP, REMOVE ALL THERMOSTAT DEMANDS TO THE UNIT Unless otherwise noted, condition applies to all GHR32Q/V units. PROBLEM: 1 UNIT FAILS TO OPERATE IN THE COOLING, HEATING, OR CONTINUOUS FAN MODE Condition Possible Cause Corrective Action / Comments 1.1.1...
  • Page 78 PROBLEM 2: UNIT FAILS TO OPERATE IN THE COOLING OR HEATING MODE, BUT COMBUSTION AIR BLOWER OPERATES CONTINUOUS. GHR32Q/V−1 through −4 UNITS WITH CONTROL BOARDS DATE CODED AFTER NOV.1 1997, WILL OPERATE IN COOLING WITH COMBUSTION AIR BLOWER CYCLING 5 SECONDS ON 55 SECONDS OFF, BUT NOT IN THE HEATING MODE.
  • Page 79 PROBLEM 3: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR BLOWER DOES NOT ENERGIZE (CONT.). Condition Possible Cause Corrective Action/Comments − Unit operates with a cooling and con- 3.3.1 ACTION 1 − Check for correct wiring and loose tinuous fan demand.
  • Page 80 PROBLEM 5: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR BLOWER ENERGIZES, IGNITOR IS ENERGIZED. (CONT.) Condition Possible Cause Corrective Action/Comments ACTION 1 − Check line pressure at the gas valve. 5.1.1 Pressure should not exceed 13" WC for both nat- −...
  • Page 81 6.3.2 NOTE: Be careful not to strip orifice threads. ACTION 2 − Check for gas leakage at the Gas orifices leak at the manifold con- GHR32Q/V−1 through −4 Units Only threaded orifice connection. Use approved meth- nection. LED#1−On od for leak detection (see unit instructions).
  • Page 82 PROBLEM 6: BURNERS LIGHT WITH HEATING DEMAND BUT UNIT SHUTS DOWN PREMATURELY (CONT.) − Combustion air blower energizes with a heating demand. − Burners light. − Diagnostic lights flash watch guard ACTION 1 − Check that the sensor is properly lo- 6.5.1 flame failure.

  • Page 83: Cooling Mode

    VSP2−1 Blower Control Board GHR32V−1 / −3 Units DOES UNIT OPERATE? CHECK: 1−UNIT POWER IS 24VAC ACROSS 2−INTERLOCK SWITCH R AND C? 3−TRANSFORMER COOLING MODE 4−LIMIT SWITCH PLACE JUMPER ACROSS R AND G. IS BLOWER ON LOW SPEED AND IS ON/OFF"...
  • Page 84 VSP3−1 Blower Control Board GHR32V−4 Units DOES UNIT OPERATE? CHECK: 1−UNIT POWER IS 24VAC ACROSS 2−INTERLOCK SWITCH R AND C? 3−TRANSFORMER COOLING MODE 4−LIMIT SWITCH PLACE JUMPER ACROSS R, G, AND Y1. IS BLOWER ON LOW SPEED AND IS ON/ OFF LED−DS3 AND HI/LOW LED−DS1 LIT? CHECK UNIT WIRING AND IF CFM LED−DS4 LIGHT SHOULD BLINK ONCE...
  • Page 85 A kit is available from the Lennox parts center to use in testing the variable speed motor. The kit 70J11 includes a test plug harness to facilitate ICM−2 check−out. Follow testing procedures outlined in the instructions provided with the kit.
  • Page 86 ICM−2 WITH VSP3 120V to the motor must not be interupted. All connections for check out will be from the voltage source below (battery or 24V) to plug J46, after disconnectiong from blower control board. CHECK−OUT PROCEDURE USING 24V SOURCE CHECK−OUT PROCEDURE USING BATTERY An ordinary 9 volt battery with maximum DC Unit transformer T1 with a maximum AC 30 volts...
  • Page 87 ICM−2 WITH TWO STAGE VARIABLE SPEED CONTROL BOARD 120V to the motor must not be interrupted. All connections for check out will be from the volt- age source below (battery or 24V) to plug J46, after disconnecting from blower control board. REMOVE PLUG FROM BOARD CHECK−OUT PROCEDURE USING 24V SOURCE CHECK−OUT PROCEDURE USING BATTERY...
  • Page 88 TABLE 35 GHR32V−1 / −3 UNITS OPERATION SEQUENCE AND JUMPERS SUMMARY WITH VSP2−1 (HEATING) MATCH UP T−Strip Mode of COMMENTS OR SEQUENCE Jumper Operation Jumper FOR COOLING JUMPERS SEE COOLING SECTION BELOW Single-Stage Heating One−Stage Blower operates on the high with Single−Stage Jumpers speed heat tap during the...
  • Page 89 (continued from previous page) GHR32V−1 / −3 UNITS OPERATION SEQUENCE AND JUMPERS SUMMARY WITH VSP2−1 (HEATING CONTINUED) MATCH UP T−Strip Mode of COMMENTS OR SEQUENCE Jumper Operation Jumper Two−Stage Heating Two−Stage Blower operates on the low With Two−Stage Jumpers speed heat/cool tap during first Thermostat stage heating.
  • Page 90 (continued from previous page) GHR32V−1 / −3UNITS OPERATION SEQUENCE AND JUMPERS SUMMARY WITH VSP2−1 (COOLING CONTINUED) T−STRIP JUMPER MATCH UP COMMENTS OR SEQUENCE FOR HEATING JUMPERS SEE HEATING SECTION ABOVE Blower speed is controlled by the DC signal from CCB1. No Jumpers Blower operates on low speed CCB1 with Single-Speed...
  • Page 91 (continued from previous page) GHR32V−1 / −3 UNITS OPERATION SEQUENCE AND JUMPERS SUMMARY WITH VSP2−1 (COOLING CONTINUED) T−STRIP JUMPER MATCH UP COMMENTS OR SEQUENCE WIRING CONNECTIONS FOR HEATING JUMPERS SEE SEE HEATING SECTION ABOVE Remove pin #3 of the J73 terminal on the VSP con- No Jumpers trol.
  • Page 92 TABLE 36 GHR32V−4 OPERATION SEQUENCE AND JUMPERS SUMMARY WITH VSP3−1 (HEATING) T−Strip Mode of COMMENTS OR SEQUENCE MATCH UP WIRING CONNECTIONS Jumper Operation Jumper FOR COOLING JUMPERS SEE COOLING SECTION Blower operates on BELOW One−Stage high speed during the Jumpers Single-Stage Heating heating mode.
  • Page 93 (continued from previous page) GHR32V−4 OPERATION SEQUENCE AND JUMPERS SUMMARY WITH VSP3−1 (HEATING CONTINUED) MATCH UP T−Strip Mode of WIRING CONNECTIONS COMMENTS OR SEQUENCE Jumper Operation Jumper Blower operates on low Two−Stage Heating Two−Stage speed during first stage With Two−Stage Jumpers heating.
  • Page 94 (continued from previous page) GHR32V−4 OPERATION SEQUENCE AND JUMPERS SUMMARY WITH VSP3−1 (COOLING CONTINUED) MATCH UP T−STRIP JUMPER COMMENTS OR SEQUENCE WIRING CONNECTIONS Blower speed is controlled Y1 to Y2 FOR HEATING JUMPERS by the DC signal from SEE HEATING SECTION ABOVE O to R CCB1.
  • Page 95 (continued from previous page) GHR32V−4 OPERATION SEQUENCE AND JUMPERS SUMMARY WITH VSP3−1 (COOLING CONTINUED) T−STRIP JUMPER MATCH UP COMMENTS OR SEQUENCE WIRING CONNECTIONS Remove the wire from Pin #2 and Pin #13 of the J49 harness connec- tor at the motor and the wire from Y1 to Y2 FOR HEATING JUMPERS Pin #3 of the J73 harness connec-...
  • Page 96 Table 37 GHR32V−5 Units Field Wiring Applications Jumper Settings (See figure 21) Thermostat Wiring Connections Term. Strip W914 W951 Y1 to Y2 1 Heat / 1 Cool SINGLE Intact Intact CONTROL OUTDOOR T’STAT TERM. STRIP UNIT NOTE − Use dip switch 3 to set second−stage heat ON delay.
  • Page 97 Table 37 GHR32V−5 Units Field Wiring Applications (Continued) Jumper Settings (See figure 21) Thermostat Wiring Connections Term. Strip W914 W951 Y1 to Y2 1 Heat / 2 Cool SINGLE Intact Intact CONTROL OUTDOOR T’STAT TERM. STRIP UNIT NOTE − Use dip switch 3 to set second−stage heat ON delay.
  • Page 98 Table 37 GHR32V−5 Units Field Wiring Applications (Continued) Jumper Settings (See figure 21) Thermostat Wiring Connections Term. Strip W914 W951 Y1 to Y2 2 Heat / 1 Cool Intact Intact CONTROL OUTDOOR T’STAT TERM. STRIP UNIT FM21 Heat SINGLE Intact CONTROL FM21 TERM.
  • Page 99 SERVICE NOTES Page 99...

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