Lennox International Inc GWB9-100IH-2 Condensate Drain Piping, Filling Condensate Trap With Water

Condensate Drain Piping

Boiler is factory equipped with a condensate trap. An additional trap is not required and should NOT be used.

1.Provide ½” PVC condensate drain and fittings. Condensate drain to be pitched down to floor drain at a minimum of ¼” per foot.

2.Install ½” PVC tee to overflow fitting as shown in Figure 11.

3.The ½” diameter schedule 40 PVC or CPVC condensate drain and pipe fittings must conform to ANSI standards and ASTM D 1785 or D2846.

4.Schedule 40 PVC or CPVC cement and primer must conform to ASTM D2564 or F493.

5.In Canada, use CSA or ULC certified schedule 40 PVC or CPVC drain pipe cement.

6.Condensate pump with reservoir (not furnished) may be used to remove condensate to a drain line (sanitary line) above boiler if floor drain is not available or is not accessible.

Filling Condensate Trap With Water

On initial start up condensate trap must be manually filled with water.

Following are the steps required to initially fill condensate trap for start up. Steps are only required at initial start up or if maintenance requires draining of condensate trap.

1.Disconnect vent condensate drain line from vent pipe connector on outlet of induced draft blower.

2.Pour about 1 cup of cold tap water into vent drain line with funnel.

3.Excess water should go through overflow and out through condensate drain line. Verify proper operation of drain line (or external condensate pump if used).

4.Reinstall vent drain line.

Chilled Water Piping

Install boiler, when used in connection with refrigeration system, so chilled medium is piped in parallel with boiler with appropriate valves to prevent chilled medium from entering boiler.

Boiler piping system of hot water boiler connected to heating coils located in air handling units where they may be exposed to refrigerated air circulation must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during cooling cycle.

Figure 11 - Condensate Drain Piping

FROM BLOWER

PITCH DRAIN PIPE DOWN TO FLOOR DRAIN AT MINIMUM 1/4” PER FOOT

OPEN TO DRAIN

1/2” PVC
PVC TEE 1/2”SLIP X	CONDENSATE
1/2” SLIP X 1/2” SLIP
	DRAIN