Dunkirk Q90-200 Installation, Operation & Maintenance Manual page 12

Condensate Drain Requirements
Condensate drain line to be pitched down to fl oor
drain at minimum of ¼" per foot (21mm/m). External
condensate pump (not furnished) may be used if
fl oor drain is not available. Condensate pump must be
designed for fl ue gas condensate application.
NOTES:
Condensate trap is to be built in the fi eld per Figure
1.
#10
Wood frame or blocks may be used to raise boiler
2.
to maintain drain pitch or to be above external
condensate pump reservoir.
There is 115 volt AC receptacle provided on service
3.
switch junction box which is located at boiler right
side, to provide power for external condensate pump
(if needed).
Figure 10 - Condensate Drain Piping
NEAR BOILER PIPING
Condensate Drain Piping
Condensate trap is to be fi eld installed as previously
shown in Figure #10. Provided are ½" PVC fi ttings for
condensate drain trap (assembled in fi eld). Condensate
drain is to be pitched down to fl oor drain at minimum of ¼"
per foot (21mm/m).
The ½" diameter schedule 40 PVC condensate drain piping
and pipe fi ttings must conform to ANSI standards and
ASTM D1785 or D2846. Schedule 40 PVC cement and
primer must conform to ASTM D2564 or F493. In Canada,
use CSA or ULC certifi ed schedule 40 PVC drain pipe and
cement.
Condensate pump with reservoir (not furnished) may be
used to remove condensate to drain line (sanitary line)
above boiler if fl oor drain is not available or is inaccessible.
Filling Condensate Trap With Water
On initial start up the condensate trap must
be manually fi lled with water.
Following are steps required to initially fi ll condensate trap
for start up, these steps are only required at initial start up
or if maintenance requires draining of condensate trap:
Pour about 1 cup of cold tap water into condensate trap
1.
vent.
Excess water should go through condensate drain line.
2.
Verify proper operation of drain line (and external
condensate pump if used).
Chilled Water Piping
Boiler, when used in connection with refrigeration system,
must be installed so chiller 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 boiler water during cooling
cycle.
12
NOTICE