Lennox G25MV Series Скачать руководство пользователя

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FIGURE 1

G25MV

PARTS IDENTIFICATION

VENT ADAPTER

CABINET TOP

G25MV

CABINET

CABINET
BOTTOM

HEAT EXCHANGER

ASSEMBLY

BURNER

ASSEMBLY

BLOWER

ASSEMBLY

COMBUSTION AIR

BLOWER

FLUE BOX

SECONDARY

LIMITS

FRONT LOUVERED

PANEL

DOOR INTERLOCK SWITCH

BURNER

CONTROL

BOARD

TRANSFORMER

PRESSURE
SWITCHES

NOx

TURBULATOR

VSP2

BOARD

FLUE THERMOSTAT

VARIABLE SPEED
BLOWER MOTOR

PRIMARY

LIMIT

G25MV BLOWER DOOR COMPONENTS – BLOWER ACCESS

FIGURE 2

BRN

BLK

BURNER

CONTROL (A3)

VSP2

CONTROL (A24)

TRANSFORMER

(T1)

DOOR INTERLOCK

SWITCH (S51)

TRANSFORMER

CIRCUIT BREAKER (CB8)

G25MV SHOWN

IN UPFLOW

POSITION

Содержание G25MV Series

Страница 1: ...equipped with an electronic vari able speed VSM fan motor The VSM motor maintains a specified air volume throughout the entire external static range Units may be installed in upflow downflow or horizo...

Страница 2: ...er is furnished with kit 2 in x 3 in 51 mm x 76 mm flue adaptor furnished with 60 input furnaces for connection to furnace induced draft blower 2 in x 4 in 51 mm x102 mm flue adaptor furnished with 75...

Страница 3: ...LIMITS FRONT LOUVERED PANEL DOOR INTERLOCK SWITCH BURNER CONTROL BOARD TRANSFORMER PRESSURE SWITCHES NOx TURBULATOR VSP2 BOARD FLUE THERMOSTAT VARIABLE SPEED BLOWER MOTOR PRIMARY LIMIT G25MV BLOWER D...

Страница 4: ...erating If the combustion air prove switch closes the combustion air blower continues to operate for 30 seconds pre purge before allowing ignition Pre purge allows the heat exchanger to be cleared of...

Страница 5: ...Switch Open Failed to Prove Combustion Blower Operation or Blocked Vent Repair or Replace as Necessary Four Flashes Open Limit Check Primary Limit Rollout Switches and Secondary Limits Find source of...

Страница 6: ...range The unit uses the VSP2 1 variable speed control board located on the blower access door which controls the blower speed and provides diagnostic LEDs The control has both a non adjustable factor...

Страница 7: ...Ref V ICM2 reference voltage PIN 11 Heat Tap Heating blower speed programming PIN 12 C 24 VAC common PIN 13 cfm Motor speed diagnostic signal Diagnostic LED Lights ON OFF DS3 indicates there is a dem...

Страница 8: ...mony II zoning applications HEATING BLOWER jumper must be in position 2 The HEAT jumper is used to set the blower speed to obtain the required CFM as outlined in HEAT SPEED section of the tables on pa...

Страница 9: ...indicate the blower is operating NOTE In Harmony II zoning ap plications HTG BLOWER jumper must be in position 2 HARMONY ZONED APPLICATIONS The blower speed is controlled by the PWM pulse width modula...

Страница 10: ...This allows for precise control of motor speed and allows the motor to compensate for varying load conditions as sensed by the controller In this case the controller monitors the static workload on th...

Страница 11: ...s down Then the motor will immediately attempt a restart The shutdown feature provides protection in case of a frozen bearing or blocked blower wheel The motor may attempt to start eight times If the...

Страница 12: ...oke Coil L13 A choke coil is used on all G25MV units The choke is located on the blower housing and is used to block radio frequency interference Precautions If the G25MV or its electronically control...

Страница 13: ...auto reset switches which actuate on a temperature rise The switches are factory set and cannot be adjusted The 1 S21 limit shown on the top opens at 140 F 5 F 60 0 C 2 8 C on a temperature rise and...

Страница 14: ...mit located on top of combustion air blower collector box see figure 15 The limit is a N C SPST auto reset limit which opens at 200 F 5 F 93 3 C 2 8 C on a temperature rise and closes at 160 F 8 F 71...

Страница 15: ...same type valve must be used 24VAC terminals and gas control knob are located on top of the valve All terminals on the gas valve are connected to wires from the electronic burner control 24V applied t...

Страница 16: ...to atmospheric pres sure If the flue becomes obstructed during operation and either switch senses a loss of negative pressure pressure becomes more equal with atmospheric pressure the switch opens th...

Страница 17: ...anual shut off valve before pressure testing to isolate furnace from gas supply FIGURE 22 MANUAL MAIN SHUT OFF VALVE GAS VALVE WILL NOT HOLD TEST PRESSURE IN EXCESS OF 0 5 PSIG 14 W C GAS VALVE CAP GA...

Страница 18: ...ered panel and disconnect the sensor wire from the flame sensor 2 Place meter in series between flame sensor and sensor wire Connect the positive lead of meter to the sensor wire and the negative lead...

Страница 19: ...the return duct as above For systems with non ducted returns leave the other end of the manometer open to the atmosphere 3 With only the blower motor running and the evaporator coil dry observe the ma...

Страница 20: ...lly clean piping thor oughly after leak detection has been completed Can cause damage to piping resulting in gas leaks fire or explosion C Supply Air Blower Check and clean blower wheel Motors are pre...

Страница 21: ...5 The combustion air blower B6 is energized by A3 If the gas valve is energized on high fire then B6 is energized on high speed if the gas valve is energized on low fire then B6 is energized on low s...

Страница 22: ...ANGED THROUGHOUT SEQUENCE THERMOSTAT CALLS FOR COOLING SYSTEM FAN SWITCHES TO HEATING SPEED AFTER SELECTED DELAY ACCA ACCH TERMINALS REMAIN ENERGIZED SYSTEM FAN SWITCHES TO CONTINUOUS SPEED AND ENERGI...

Страница 23: ...OCKOUT MAIN VALVE OFF COMBUSTION AND SYSTEM FANS ON RESET OR REPLACE ROLLOUT SWITCH BURNER CONTROL LED 4 flashes MAIN VALVE OFF COMBUSTION SYSTEM FANS ON SEQUENCE HOLDS UNTIL SWITCH CLOSES BURNER CONT...

Страница 24: ...NO NO YES YES DOES UNIT OPERATE CHECK 1 UNIT POWER 2 INTERLOCK SWITCH 3 TRANSFORMER 4 LIMIT SWITCH END OF TEST REPLACE THE VSP2 1 HEATING MODE NO YES YES YES AFTER THE SELECTED TIME DOES BLOWER TURN...

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