Figure 11
AUTOMATIC HEAT STAGING JUMPER
When installing optional accessories to this appliance, follow the manufacturer's installation instructions included with the accessory.
The unit cabinet must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical fault should occur. This may consist of electrical wire or approved conduit when installed in accordance with existing electrical codes. Do not use gas piping as an electrical ground. Failure to follow this warning can result in an electrical shock, fire, bodily harm, or loss of life.
GAS CONNECTIONS
Gas piping shall be of such size and so installed as to provide a supply of gas sufficient to meet maximum demands without undue loss of pressure between the gas meter and the furnace. It is recommended that the gas line to the furnace shall be a separate line direct from the meter, unless the existing gas line is of ample capacity. Refer to gas pipe capacity table in the National Fuel Gas Code ANSI Z223.1/NFPA54, and/or CSA B149.1 Natural Gas and Propane Installation Codes.
If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do no use a connector which has previously serviced another gas appliance.
Use a joint compound (pipe dope) that is resistant to the action of liquefied petroleum gases or any other chemical constituents of the gases to be conducted through the piping.
For proper furnace operation the maximum gas supply pressure is 14" w.c. and the minimum gas supply pressure is 4.5" w.c. - Natural (11" w.c. - LP) as shown on rating label.
Before any system of gas piping is finally put into service, it should be carefully tested to determine if it is gas tight. Check all piping for leaks using soapy water and a brush. The piping must stand a pressure of six (6) inches of mercury (3 PSIG) for a period of ten (10) minutes or as required by local authority.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.
The furnace and its individual shutoff valve must be disconnected from the supply piping system during any pressure testing of that system at test pressures in excess of 1/2 PSIG (3.5kPa or 14"w.c.).
The furnace must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at pressures equal to or less than 1/2 PSIG (3.5kPa or 14"w.c.). Failure to follow the above procedures could lead to a hazardous condition and bodily harm.
Figure 12-A
GAS CONTROL PIPING
Figure
TYPICAL GAS SERVICE CONNECTION
20571201 | Issue 0527 | Page 16 of 28 |
