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GOLD CGi Gas-Fired Water Boiler — Boiler Manual

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Part Number 550-110-710/0107

General piping information

If installation is to comply with ASME or Canadian requirements, an ad-

ditional

is needed. Install control in supply piping

between boiler and isolation valve. Set second control to minimum 0°F

above setpoint of first control. Maximum allowable setpoint is 40°F. See

Section

for wiring.

A

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 probe-type is

recommended. Purchase and install in tee in supply piping above boiler.
Use

 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).

Relief valve

Install relief valve vertically in ¾” tapping on side of boiler. See

or

, page 1, and the tag attached to the relief valve for manufacturer’s

instructions.

Table 6  Water pipe size (based on 20°F rise)

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.

and

show typical near-boiler

piping connections.

System water piping

See

 (diaphragm-type or bladder-type expan-

sion tank) or 

 (closed-type expansion tank)

and

, for  near-boiler  and  single-zone  systems

designed for return water at least 130°F.
See pages -3 to complete multiple-zone piping or
pages  4-9  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 9 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 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.

To avoid water damage or scalding due to relief valve

operation:

•  Discharge line must be connected to relief valve outlet and

. 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

 throughout its entire length.

•  Discharge line must

from the valve and terminate

at least 6” above the floor drain where any discharge will be clearly

visible.

•  The discharge line shall

, with a mate-

rial serviceable for temperatures of 35°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.

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.

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.