Water Piping - Weil-McLain CGa 2 Series Manual

CGa Series 2 Gas-Fired Water Boiler — Boiler Manual
3a
Water piping — general information
General piping information
ditional
between boiler and isolation valve. Set second control to minimum 20°F
page 36, for wiring.
A
recommended. Purchase and install in tee in supply piping above boiler.
in cold water supply as required by local codes.
Pressure/temperature gauge
Install pressure/temperature gauge in tee on supply piping (as shown in
drawing on page 3).
Isolation valves
sensor. Install as shown in appropriate piping diagram.
Relief valve
instructions.
To avoid water damage or scalding due to relief valve
operation:
possibility of severe burns should the valve discharge.
visible.
rial serviceable for temperatures of 375°F or greater.
shall be installed between the relief valve and boiler,
or in the discharge line. Do not plug or place any obstruction in the
discharge line.
with the above guidelines could result in failure of
the relief valve to operate, resulting in possibility of severe personal
injury, death or substantial property damage.
fails to operate correctly, replace it with a new relief valve.
16
is needed. Install control in supply piping
is required when boiler is installed above ra-
. Terminate the discharge line to eliminate
throughout its entire length.
from the valve and terminate
after filling and pressurizing system
Circulator
- The circulator is shipped loose (wiring pre-attached to
boiler) to allow you to locate it either in the return or
supply piping, as desired. See page 3 for a typical instal-
lation. Pipe the expansion tank to the suction side of the
circulator whenever possible. Install an air separator in
the supply piping. Connect the expansion tank to the air
separator only if the separator is on the suction side of
the circulator. Always install the system fill connection
at the same point as the expansion tank connection to
the system.
piping connections.
System water piping
See
sion tank) or
and
systems designed for return water at least 130°F.
See pages 18-19 to complete multiple-zone piping or
pages 20-25 to complete piping for radiant heating
systems or converted gravity systems (large-volume
systems originally designed for circulation by natural
convection rather than a pump). See page 25 for boilers
used with refrigeration systems.
Table 3 Water pipe size (based on 20°F rise)
Note: The boiler supply and return connections, the return/
drain tee and the supply/gauge tee supplied with
the boiler are 1¼" NPT. One of the circulator flanges
supplied with the boiler is 1¼". The other circulator
flange is the size of the recommended system piping
shown above.
, with a mate-
chilled medium from entering boiler. Consult
air handling units where they can be exposed to
refrigerated air, use flow control valves or other
automatic means to prevent gravity circulation
during cooling cycle. Circulation of cold water
through the boiler could result in damage to the heat
exchanger, causing possible severe personal injury,
death or substantial property damage.
and show typical near-boiler
(diaphragm-type or bladder-type expan-
(closed-type expansion tank),
below, for near-boiler and single-zone
To
¾"
1"
1¼"
1½"
Install boiler such that —
Part Number 550-142-900/1016
¾"
1"
1¼"
1½"
: