All installations and services must be performed by qualified service personnel.
occurs. Wait at least 24 hours for the circuit to fully dry before energizing the system.
: The furnace and its gas valve must be disconnected from the gas supply during pressure testing of the gas supply system at pressures in excess of 1/2 PSIG or 14 inches w.c
F.GENERAL VENTING REQUIREMENTS
The CMA/CMC furnace venting system must be installed by a qualified service person in accordance with local codes, the National Fuel Gas Code NFPA
The following items and local code requirements must be followed:
1.The vent/air intake terminations outlined by Thermo Products in this manual must be used.
2.The entire vent/air intake system must be made of PVC Schedule 40 pipe except for the concentric vent kit. NOTE: All CMA/CMC furnaces must be installed with outside combustion air.
3.The flue vent pipe and combustion air pipe must be at least as large as the exhaust vent/air intake pipe specified by Thermo Products. No reduction in size is permissible. The CMA/CMC requires 2” Schedule 40 PVC pipe.
4.This furnace shall not be common vented with any other appliance including those burning solid fuels.
5.The maximum permissible vent length of straight pipe and number of elbows permitted for the exhaust vent and combustion air inlet is shown in Table 2. The elbows shown are in addition to the length of straight pipe permitted. When counting elbows, all elbows used in the exhaust vent or combustion air intake must be counted. This includes elbows used inside the furnace jacket and termination elbows.
Care should be taken to plan out the vent system to be as short as possible (but not shorter than 8 ft.) and to contain as few elbows as possible to insure the best possible operation of the furnace.
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