the outlet of the trap is at least 1 in. (25 mm) lower than the drain-pan condensate connection to prevent the pan from overflowing. Prime the trap with water. When using a gravel apron, make sure it slopes away from the unit.
If the installation requires draining the condensate water away from the unit, install a field-supplied 2-in. (51 mm) trap at the condensate connection to ensure proper drainage. Condensate trap is available as an accessory or is field-supplied. Make sure that the outlet of the trap is at least 1 in. (25 mm) lower than the unit drain-pan condensate connection to prevent the pan from overflowing. Connect a drain tube using a minimum of field-supplied 3/4 -in. PVC or field-supplied 3/4 -in. copper pipe at outlet end of the 2 -in. (51 mm) trap (See Fig. 9). Do not undersize the tube. Pitch the drain tube downward at a slope of at least 1 in. for every 10 ft. (3 m) of horizontal run. Be sure to check the drain trough for leaks. Prime the trap at the beginning of the cooling season start-up.
Install Flue Hood
!WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
The venting system is designed to ensure proper venting. The flue hood assembly must be installed as indicated in this section of the unit installation instructions.
Install the flue hood as follows:
1.This installation must conform with local building codes and with the National Fuel Gas Code (NFGC), NFPA 54/ANSI Z223.1 (in Canada, CAN/CSA B149.1, and B149.2) or latest revision. Refer to provincial and local plumbing or wastewater codes and other applicable local codes.
2.Remove flue hood from shipping location (inside the return section of the blower compartment-See Fig. 8). Remove the return duct cover to locate the flue hood. Remove two screws on flue panel. Place flue hood assembly over flue panel. Orient screw holes in flue hood with holes in the flue panel.
3.Secure flue hood to flue panel by inserting a single screw on the top and the bottom of the hood.
TRAP
OUTLET
1-in. (25 mm) min.
2-in. (51 mm) min.
A09052
Fig. 9 - Condensate Trap
Install Gas Piping
The gas supply pipe enters the unit through the access hole provided. The gas connection to the unit is made to the 1/2-in. FPT gas inlet on the gas valve.
Install a gas supply line that runs to the heating section. Refer to Table 2 and the current edition of NFGC in the U.S. and the current
NSCNGPIC in Canada. Do not use cast-iron pipe. It is recommended that a black iron pipe is used. Check the local utility for recommendations concerning existing lines. Size gas supply piping for 0.5 IN. W.C. maximum pressure drop. Never use pipe smaller than the 1/2-in. FPT gas inlet on the unit gas valve.
For natural gas applications, the gas pressure at unit gas connection must not be less than 4.0 IN. W.C. or greater than 13 IN. W.C. while the unit is operating. For propane applications, refer to propane conversion kit instructions.
A1/8-in. (3.2 mm) NPT plugged tapping, accessible for test gauge connection, must be installed immediately upstream of the gas supply connection to the gas valve and downstream of manual equipment shutoff valve.
When installing the gas supply line, observe local codes pertaining to gas pipe installations. Refer to the NFPA 54/ANSI Z223.1-2009 (in Canada, CAN/CSA B149.1).
NOTE: In the state of Massachusetts:
1.Gas supply connections MUST be performed by a licensed plumber or gas fitter.
2.When flexible connectors are used, the maximum length shall not exceed 36 in. (915 mm).
3.When lever handle type manual equipment shutoff valves are used, they shall be T-handle valves.
4.The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.
In the absence of local building codes, adhere to the following pertinent recommendations:
1.Avoid low spots in long runs of pipe. Grade all pipe 1/4 in. (6.35 mm) for every 15 ft (4.6 m) of length to prevent traps. Grade all horizontal runs downward to risers. Use risers to connect to heating section and to meter.
2.Protect all segments of piping system against physical and thermal damage. Support all piping with appropriate straps, hangers, etc. Use a minimum of one hanger every 6 ft. (1.8 m). For pipe sizes larger than 1/2 in., follow recommendations of national codes.
3.Apply joint compound (pipe dope) sparingly and only to male threads of joint when making pipe connections. Use only pipe dope that is resistant to action of liquefied petroleum gases as specified by local and/or national codes. Never use Teflon tape.
4.Install sediment trap in riser leading to heating section (See Fig. 10). This drip leg functions as a trap for dirt and condensate.
5.Install an accessible, external, manual main shutoff valve in gas supply pipe within 6 ft (1.8 m) of heating section.
6.Install ground-joint union close to heating section between unit manual shutoff and external manual main shut off valve.
7.Pressure test all gas piping in accordance with local and national plumbing and gas codes before connecting piping to unit.
NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply piping must be disconnected from the gas valve during the testing of the piping systems when test pressure is in excess of 0.5 psig. Pressure test the gas supply piping system at pressures equal to or less than 0.5 psig. The unit heating section must be isolated from the gas piping system by closing the external main manual shutoff valve and slightly opening the ground-joint union.
