Thermo Products CMC1-50D36N, CMC1-50DV3N, CMC1-75D36N, CMA3-50D36N F.Furnace Checkout Procedure

Models: CMC1-75DV3N CMA3-75D36N CMA3-50D36N CMC1-75D36N CMC1-50D36N CMC1-50DV3N

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All installations and services must be performed by qualified service personnel.

F.FURNACE CHECKOUT PROCEDURE

Before any system of gas piping is finally put into service, it shall be carefully tested to assure that it is gas tight as indicated in the Fuel Piping Section of this Furnace Manual.

NOTICE: All controls on the unit should be checked for proper functioning prior to the qualified service personnel leaving the job site. Specifically the following should be checked:

With furnace in normal heating operation, check to make certain blower will start and stop automatically under control of integrated fan control.

1.Check safety limit control as follows:

a.Shut off incoming power.

b.Block return air opening or disconnect blower motor leads.

c.Restore power to furnace.

d.Set thermostat above room temperature calling for heat.

e.When temperatures are reached in furnace at limit control setting with blower out of operation, burner should shut off.

f.Shut off electrical power.

IMPORTANT: Remove blockage or reconnect blower motor and restore power.

2.Make certain thermostat will automatically start and stop furnace.

3.Block the flue pipe outlet gradually with a flat piece of metal, until the pressure switch functions shutting off the main burners. IMPORTANT: Remove flue outlet blockage when done.

4.Block the PVC pipe inlet gradually with a flat piece of metal until pressure switch functions shutting off the main burners. IMPORTANT: Remove air inlet blockage when done.

5.Remove the blower compartment access door with the furnace operating. The door interrupt switch is in the 120 volt circuit and will shut down the entire system. Replace the blower door and the furnace start-up cycle will begin.

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Thermo Products CMC1-50D36N, CMC1-50DV3N, CMC1-75D36N, CMA3-50D36N, CMA3-75D36N, CMC1-75DV3N F.Furnace Checkout Procedure

FAQ

What should be checked before putting gas piping into service?

Before any system of gas piping is finally put into service, it shall be carefully tested to assure that it is gas tight as indicated in the Fuel Piping Section of this Furnace Manual.

How can I test the safety limit control?

To test the safety limit control, shut off incoming power, block the return air opening or disconnect blower motor leads, restore power to the furnace, set thermostat above room temperature calling for heat, and observe the burner shutting off when temperatures are reached.

What should I do if the blower compartment access door is removed?

If the blower compartment access door is removed with the furnace operating, the door interrupt switch will shut down the entire system. Replace the blower door and the furnace start-up cycle will begin.