Dunkirk GWB9-050IH-2 Installation Instructions Manual page 21

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 fi ttings.
Condensate drain to be pitched down to fl oor drain at a
minimum of ¼" per foot.
2. Install ½" PVC tee to overfl ow fi tting as shown in
Figure 11 .
3.
The ½" diameter schedule 40 PVC or CPVC condensate
drain and pipe fi ttings 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 certifi ed 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 fl oor drain is not available or is not
accessible.
Figure 11 - Condensate Drain Piping
NEAR BOILER PIPING
Filling Condensate Trap With Water
On initial start up condensate trap must be manually fi lled
with water.
Following are the steps required to initially fi ll condensate
trap for start up. Steps are only required at initial start up
or if maintenance requires draining of condensate trap.
1.
2.
3.
4.
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 fl ow control valves or other automatic means to
prevent gravity circulation of the boiler water during cooling
cycle.
1/2" PVC
PVC TEE 1/2"SLIP X
1/2" SLIP X 1/2" SLIP
21
Disconnect vent condensate drain line from vent pipe
connector on outlet of induced draft blower.
Pour about 1 cup of cold tap water into vent drain line
with funnel.
Excess water should go through overfl ow and out
through condensate drain line. Verify proper operation
of drain line (or external condensate pump if used).
Reinstall vent drain line.
FROM BLOWER
PITCH DRAIN PIPE
DOWN TO FLOOR
DRAIN AT MINIMUM
1/4" PER FOOT
OPEN
TO DRAIN
CONDENSATE
DRAIN