Water Piping - Crown Boiler BWF Series Installation Instructions Manual

7

Water Piping

!
WARNING
• Failure to properly pipe boiler may result in
improper operation and damage to boiler or
building.
• Install boiler so that the gas ignition system
components are protected from water (dripping,
spraying, rain, etc.) During appliance operation
and service (circulator replacement, etc.).
• Operation of this boiler with continuous return
temperatures below 120°F can cause severe
heat exchanger corrosion damage.
• Operation of this boiler in a system having
significant amounts of dissolved oxygen can
cause severe heat exchanger corrosion
damage.
• Do not use toxic additives, such as automotive
antifreeze, in a hydronic system.
• Pipe relief valve discharge to a safe location.
The safety relief valve may discharge scalding
hot water.
• Do not install a valve in the safety relief valve
discharge line.
• Do not move relief valve from factory specified
location.
• Do not plug relief valve discharge. Blocking the
safety relief valve may result in boiler explosion.
Figure 7.1: Standard Safety Relief Valve Position
22
A. Standard Piping
Figure 7.3 shows typical boiler system
connections on a single zone system. Additional
information on hydronic system design may be
found in the I=B=R Guide RHH published by
the Air-Conditioning, Heating and Refrigeration
Institute (AHRI). The components in this system
and their purposes are as follows:
1. Safety Relief Valve (Required) - Mount the
relief valve on the left side of the boiler as
shown in Figure 7.1 using the 1-1/4 x 4 nipple,
1-1/4 x 3/4 reducing elbow and 3/4 x close
nipple provided. The relief valve shipped with
the boiler is set to open at 30 psi. This valve
may be replaced with one having a pressure
up to the "Maximum Allowable Working
Pressure" shown on the rating plate. If the
valve is replaced, the replacement must have
a relief capacity in excess of the DOE heating
capacity for the boiler.
Pipe the discharge of the relief valve to a
location where water or steam will not create a
hazard or cause property damage if the valve
opens. The end of the discharge pipe must
terminate in an unthreaded pipe. If the relief
valve discharge is not piped to a drain it must
terminate at least 6 inches above the floor. Do
Figure 7.2: Alternate Safety Relief Valve Position
109836-01 - 04/20