GOLD CGa Gas-Fired Water Boiler
16 Part Number 550-110-593/1099
Water piping — general information3aBoiler model To
system
From
system
CGa-25 ¾" ¾"
CGa-3 1" 1"
CGa-4 1" 1"
CGa-5 1" 1"
CGa-6 1¼" 1¼"
CGa-7 1¼" 1¼"
CGa-8 1½" 1½"
Note:Circulator flange supplied with boiler is same size as
recommended piping above.
General piping information
If installation is to comply with ASME or Canadian requirements, an
additional high temperature limit is needed. Install control in supply piping
between boiler and isolation valve. Set second control to minimum 20 °F
above setpoint of first control. Maximum allowable setpoint is 240 °F. See
page 34 or 38, for wiring.
Alow water cutoff device is required when boiler is installed above
radiation level or by certain state or local codes or insurance companies.
Use low water cutoff designed for water installations. Electrode probe-type
is recommended. Purchase and install in tee in supply piping above boiler.
Use backflow check valve in cold water supply as required by local codes.
Relief valve
Install relief valve vertically in ¾" tapping on side of boiler. See Figure 9 or
10 and the tag attached to the relief valve for manufacturer’s instructions.
To avoid water damage or scalding due to relief valve
operation:
• Discharge line must be connected to relief valve outlet and run to a
safe place of disposal. Terminate the discharge line to eliminate
possibility of severe burns should the valve discharge.
• Discharge line must be as short as possible and be the same size as
the valve discharge connectionthroughout its entire length.
• Discharge line must pitch downward from the valve and terminate
at least 6" above the floor drain where any discharge will be clearly
visible.
• The discharge line shall terminate plain, not threaded, with a
material serviceable for temperatures of 375 °F or greater.
•Do not pipe the discharge to any place where freezing could occur.
•No shutoff valve 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.
•Failure to comply 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.
•Test the operation of the valve after filling and pressurizing system
by lifting the lever. Make sure the valve discharges freely. If the valve
fails to operate correctly, replace it with a new relief valve.
System water piping
See Figure 9 (diaphragm-type or bladder-type
expansion tank) or Figure 10(closed-type expansion
tank) on page 21,and Table 3below, for near-boiler and
single-zone 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.
Refer to page 25 for boilers used with refrigeration systems.
Install boiler such that —
• Chilled medium, if used, is piped in parallel with
heating boiler. Use appropriate valves to prevent
chilled medium from entering boiler. Consult
I=B=R Installation and Piping Guides.
• If boiler is connected to heating coils located in 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.
Pressure/temperature gauge
Install pressure/temperature gauge in tee on supply piping (as shown in
drawing on page 3). The gauge well is a self-closing valve, allowing removal
of the gauge without draining the system.