Dunkirk 90-50 Installation, Operation & Maintenance Manual page 18

figure 8 - Condensate drain piping
Condensate drain piping
The condensate trap is built into the boiler, an external trap is not
required and should NOT be used.
Provide ½" PVC condensate drain and fittings. Condensate drain to
be pitched down to floor drain at a minimum of ¼" per foot.
Install furnished ½" PVC tee to overflow fitting as shown in Figure
8.
The ½" diameter schedule 40 PVC or CPVC condensate drain and
pipe fittings must conform to ANSI standards and ASTM D 1785
or D2846. Schedule 40 PVC or CPVC cement and primer must
conform to ASTM D2564 or F493. In Canada, use CSA or ULC
certified schedule 40 PVC or CPVC drain pipe cement.
A condensate pump with a reservoir (not furnished) may be used
to remove condensate to a drain line (sanitary line) above boiler if a
floor drain is not available or its in accessible.
near boiler piping
filling Condensate Trap With Water
On The Initial Start Up The Condensate Trap Must Be Manually
Filled With Water.
The following are the steps required to initially fill the condensate
trap for start up, these steps are only required at the initial start up or
if maintenance requires draining of the condensate trap:
Disconnect the vent condensate drain line from the bottom of
1.
the vent tee on the boiler.
Pour about 1 cup of cold tap water into the vent drain line with
2.
a proper funnel.
Excess water should go through the overflow and out through
3.
the condensate drain line. Verify proper operation of the drain
line (or external condensate pump if used).
Reinstall the vent drain line.
4.
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