GOLD CGi
4a Water piping — general information
General piping information
If installation is to comply with ASME or Canadian requirements, an ad- ditional 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 Section 9b for wiring.
A low water cutoff device is required when boiler is installed above ra- diation level or by certain state or local codes or insurance companies. Use low water cutoff designed for water installations. Electrode
Use backflow check valve in cold water supply as required by local codes.
Circulator
The circulator is shipped loose (wiring
Pressure/temperature gauge
Install pressure/temperature gauge in tee on supply piping (as shown in drawing on page 3).
Relief valve
Install relief valve vertically in ¾” tapping on side of boiler. See Figure 16 or 17, page 21, 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 connection throughout 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 mate- rial 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 16
See pages
Table 6 Water pipe size (based on 20°F rise)
Boiler | To | From |
model number | system | system |
¾" | ¾" | |
|
|
|
1" | 1" | |
1¼" | 1¼" | |
|
|
|
1½" | 1½" | |
|
|
|
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 sup- plied with the boiler is 1¼”. The other circulator flange is the size of the recommended system piping shown above.
Chillers or air handling units:
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 au- tomatic 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.
20 | Part Number |
|
