CAC / BDP BW4BAH-105, Installation, Operation & Maintenance Manual

Page: 9 / 32

9
1.
Installation of boiler for new heating system,
Install all of radiation units (panels, radiators,
baseboard, or tubing) and supply and return mains
fi rst. After all heating system piping and components
have been installed, make fi nal connection of system
piping to boiler. It is recommended to mount circulating
pump on supply side piping, such that it pumps away
from expansion tank. Refer to fi gures on next pages.
2.
Equip hot water boiler installed above radiation
level with low water cut off device. Periodic inspection
is necessary, as is fl ushing of fl oat type devices, per
low water cut off manufacturer’s speci fi c instructions.
3.
Packaged boiler is set up with 1¼” NPT supply
and return piping from front of boiler. Boiler supply
and return piping can be moved to rear of boiler. Boiler
should not be piped return line to front, supply line
to rear, or vice versa, will cause boiler water to short
circuit heat exchanger. Piping connections may require
additional fi ttings and parts.
4.
Install drain valve provided with boiler in return tee. .
5.
Install Safety Relief Valve in rear section using ¾”
nipple and street elbow provided with boiler. See fi gure
6a.
A. Install safety relief valve with spindle in vertical
position.
B. Do not install shutoff valve between boiler and
safety relief valve.
C. Install discharge piping from safety relief valve.
• Use ¾” or larger pipe. See fi gure 6b.
• Use pipe suitable for temperatures of 375°F
(191°C) or greater.
• Individual boiler discharge piping shall be
independent of other discharge piping.
• Size and arrange discharge piping to avoid
reducing safety relief valve relieving capacity
below minimum relief valve capacity stated on
rating plate.
• Run pipe as short and straight as possible to
location protecting user from scalding and properly
drain piping.
• Install union, if used, close to safety relief valve
outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
• Terminate pipe with plain end (not threaded).
6.
Verify clean cold water supply is available when
connecting to pressure reducing valve. When water
supply is from well or pump, a sand strainer should be
installed at the pump.
SYSTEM PIPING
Figure 6a - Safety Relief Valve Installation
Follow Instructions
to install discharge
piping from safety
relief valve to drain.
Check local
codes for
maximum
distance
from fl oor
or allowable
safe point of
discharge
.
SAFETY RELIEF VALVE
DISCHARGE
LINE
Figure 6b - Discharge Piping From Safety Relief
Valve