Exhaust Pipe Venting Information . Manual reset switches are factory installed on burner box. after unit lockout, eliminating nuisance calls for service. Repair Parts List. 69 Refer to Engineering Handbook for additional information. **Consider . G61MPV units are CSA International certified to ANSI. Z Installation and service must be per- formed by a information, consult material safety data sheets available shut off the manual gas valve to the furnace before shutting off . G61MPV units are equipped with a SureLight® ignition sys- tem.

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It closes a circuit to the furnace control when pressure inside the cold end header box decreases to literatue certain set point. The box has pressure taps for the CAI prove switch hoses. Don’t have an account? When excess heat is sensed in the blower compartment, the limit will open. In attic or closet installations, vertical termination through the roof is preferred.

To avoid this complication in downflow bustion air, corrections must be made as outlined in the applications which do not include a downflow previous section. Remove upper and lower furnace access panels. Gas Valve GV1 8. Readings will change as heat exchanger warms. Correctly route prove switch line. It may be necessary to cut the exiting exhaust pipe for removal of the fittings.

To Measure Temperature Rise: When servicing controls, label all wires prior to disconnecting. Thermostat jumper E20 dictates which mode unit will operate in.

Service Literature

After 5 tries the control diagnostics flash the watchguard burners failed to ignite code. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination. The blower will maintain the desired cfm as long as external static pressure does not exceed g61mpg.


Humidity level above setpoint.

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or death. Reconnect exhaust piping and exhaust drain tubing. The gas valve senses the pressure in the burner box and changes gas valve outlet manifold pressure based on changes in the burner box pressure. The air intake G61MPV, as well as to other gas-fired appliances which opening with the protective screen should always be are separately vented.


Burners light roughly and the unit fails to stay lit. During this time the electronic controller is determining the exact position of the rotor. I Unit Components 3. The intent is to compensate for different vent configurations which can greatly affect the rate of the unit. On the opposite side of the cabinet, glue the provided 2″ vent plug into the unused flue collar. Main power polarity reversed.

G61MPV Service Literature G61MPV SERIES UNITS |

The termination pipe must be sized as listed in table The air flow is determine by counting blinks between two 2 second pauses. Call for dehumidification incormation by CCB1 control. It is recommended that the exhaust outlet not be located within 6 feet 1. Both type thermostats are described below.

The purpose of the switch is to prevent burner operation if the combustion air inducer is not operating or if the flue becomes obstructed. The board and ignitor work in combination to ensure furnace ignition and ignitor durability. The literathre assigns priority to J49 pin 2 so that if a call for cooling and a call for heating are concurrent, heating call overrides and the blower operates on high speed heating tap.


Ignitor is energized but unit fails ingormation light. No further lubrication is needed. Blower Check the blower wheel for debris and clean if necessary.

If temperature is too high, first check the firing rate. Locate supply air thermometer in the first horizontal run of the plenum where it will not pick up radiant heat from the heat exchanger. Force or attempted repair may result in a fire or explosion. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect eervice es. Hammer blows should not be used when inserting pipe.

When exhaust piping must be run up an outside wall, any reduction in exhaust pipe size must be done after the final elbow. Condensate should flow freely during operation of furnace. Motors operate the same and are only different in physical appearance.

Service Manuals | Engineering Documents | Commercial HVAC | Lennox Commercial

Combustion air inducer runs until stage thermostats. Board 49M59 finds the lowest ignitor temperature which will successfully light the burner, thus increasing the life of the ignitor. PLUG Must be glued in place 2″ 18 in. Ignitor longevity is enhanced by controlling voltage to the ignitor. Reconnect the gas supply line to the gas valve. The minimum ex- Vent or a Direct Vent gas central furnace. CAUTION The exhaust vent pipe operates under positive pressure and must be completely sealed to prevent leakage of combustion products into the living space.

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