13
vII - NEAR bOILER PIPING
Pressure Relief valve / Temperature Pressure Gauge
The boiler is furnished with a relief valve in the boiler parts
bag. Provide ¾” piping from the supplied relief valve to
a local floor drain, but leave an air gap between piping
and drain. No shutoff of any description shall be placed
between safety relief valve and the boiler, or on the dis-
charge pipes between such safety valve and the atmo-
sphere. Installation of the safety relief valve shall conform
to ANSI/ASME Boiler and Pressure Vessel Code, Sec-
tion IV. The manufacturer is not responsible for any water
damage. Check local codes for maximum height from dis-
charge piping to floor.
Supply & Return Lines
The packaged boiler unit is set up to receive 1¼” NPT
return piping from the rear of the unit with an option for left
or right return connections. 1¼” NPT supply piping exits
the boiler jacket at the top of the unit.
NOTE:
On some boilers the circulator pump
and isolation valves are furnished in a carton
inside the boiler cabinet and can be installed
at the installer preferred location.
Condensate Drain Piping
The condensate trap is integral to the boiler. Use the sup-
plied 1/2” PVC tee, then transition to ½” pipe and fittings
for PVC condensate drain line. Condensate drain line to
be pitched down to floor drain at a minimum of ¼” per
foot.
The ½” diameter schedule 40 PVC condensate drain pip-
ing and pipe fittings must conform to ANSI standards and
ASTM D1785. Schedule 40 PVC cement and primer must
conform to ASTM D2564. In Canada, use CSA or ULC
certified schedule 40 PVC drain pipe and 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 avail-
able or is inaccessible.
filling the Condensate Trap with water
ImPORTANT: On initial start up the conden-
sate trap must be manually filled with water.
The following are the steps required to initially fill the con-
densate trap for start up, these steps are only required at
the initial start up or if maintenance requires draining of
the condensate trap:
Pour about 1 cup of cold tap water into the vent drain
1.
line using the 1/2” PVC vent tee provided with the
boiler.
Excess water should go through the overflow and out
2.
through the condensate drain line. Verify proper op-
eration of the drain line (or external condensate pump
if used).
Reinstall the vent drain line.
3.
Chilled water Piping
The boiler, when used in connection with a refrigeration
system, must be installed so the chiller medium is piped in
parallel with the boiler with appropriate valves to prevent
the chilled medium from entering the boiler.
The boiler piping system of a hot water boiler connect-
ed 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.
