Справочник Пользователя для Weil-McLain GOLD CGI-4E

20

Part Number 550-110-711/1108

Water piping — general 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 20°F

above setpoint of first control. Maximum allowable setpoint is 240°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.

Install pressure/temperature gauge in tee on supply piping (as shown in 
drawing on page 3).

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

or

, page 21, and the tag attached to the relief valve for manufacturer’s 

instructions.

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

1”

1”

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.

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.

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 22-23 to complete multiple-zone piping or
pages  24-29  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 29 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 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.

 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.