Thermal Solutions APEX APX425C Installation, Operating And Service Instructions page 44

6
Water Piping and Trim
Figure 6-6: Factory Supplied Piping and Trim Installation - APX525C, APX625C, APX725C and APX825C
C. Standard Installation Requirements
Observe the following guidelines when making the
actual installation of the boiler piping:
1. Safety Relief Valve (Required) – The safety
relief valve is packaged loose with boiler and
must be installed in the location shown in
Figure 6-1 or 6-6 "Factory Supplied Piping and
Trim Installation". The safety relief valve must
be installed with spindle in vertical position.
Installation of the safety relief valve must
comply with ASME Boiler and Pressure Vessel
Code, Section IV. The standard factory shipped
safety relief valve is set at 50 psi (340 kPa)
on APX425C and APX525C and 60 psi (410
kPa) on APX625C, APX725C and APX825C.
Optional 80 psi (550 kPa) and 100 psi (689
kPa) safety relief valve kits are available. If
the safety relief valve is to be replaced, the
replacement valve must have a relief capacity
equal or exceeding the minimum relief valve
capacity shown on the heat exchanger ASME
plate. Also, when replacing the safety relief
valve, verify the temperature and pressure
gage meets ASME requirements for the
replacement safety relief valve. Pipe the safety
relief valve discharge to a location where
hot water or steam will not create hazard or
property damage if the valve opens.
44
(continued)
APEX Installation, Operating, & Service Instructions
The end of the discharge pipe must terminate
in an unthreaded pipe. If the safety relief valve
is not piped to a drain, it must terminate at
least 6 in. (150 mm) above the floor. Do not run
safety relief valve discharge piping through
an area prone to freezing. The termination of
discharge piping must be in an area where it
will not become plugged by debris.
!
WARNING
Burn Hazard.
Safety relief valve discharge piping must be
piped such that the potential of severe burns
is eliminated. DO NOT pipe in any area where
freezing could occur. DO NOT install any shut-off
valves, plugs or caps. Consult local codes for
proper discharge piping arrangement.
106308-05 - 3/23