Weil-McLain CGA25SPDN manual 3a Water piping general information

GOLD CGa Gas-Fired Water Boiler — Boiler Manual

3a Water piping — general information

General piping information

)F INSTALLATION IS TO COMPLY WITH !3-% OR #ANADIAN REQUIREMENTSAN AD- ditional HIGH TEMPERATURERLIMIT 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.

A LOWWWATERTCUTOFF 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 probe-type is recommended. Purchase and install in tee in supply piping above boiler.

Use BACKmOW CHECKK VALVE in cold water supply as required by local codes.

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

THEHSUPPLY PIPINGI#ONNECTNTHEHEXPANSIONNTANK TO THEHAIR 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. &IGURESU and  show typical near-boiler piping connections.

Pressure/temperature gauge

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

Relief valve

)NSTALLTRELIEF VALVELVERTICALLY IN Ðv TAPPINGPON SIDE OF BOILER3EEE&IGURE  OR , page 17, and the tag attached to the relief valve for manufacturer’s

instructions.

System water piping

See &IGURE  (diaphragm-type or bladder-type expan- sion tank) or &IGURE  (closed-type expansion tank), and 4ABLE  below, for near-boiler and single-zone systems designed for return water at least 130°F.

3EEEPAGESGTO COMPLETE MULTIPLEZONELPIPING 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.

To avoid water damage or scalding due to relief valve operation:

ss$ISCHARGEHLINE MUST BE CONNECTEDETO RELIEF VALVELOUTLET ANDNRUNUTO AA SAFEEPLACEAOF DISPOSAL. Terminate the discharge line to eliminate possibility of severe burns should the valve discharge.

ss$ISCHARGEHLINE MUST BE AS SHORTOAS POSSIBLE ANDNBE THEHSAME SIZEEAS THEHVALVE DISCHARGEECONNECTION throughout its entire length.

ss$ISCHARGEHLINE MUST PITCHHDOWNWARD from the valve and terminate

AT LEASTAv ABOVEOTHEHmOOR DRAINAWHEREEANYNDISCHARGEHWILL BE CLEARLYR visible.

ss4HEHDISCHARGEHLINE SHALLATERMINATEIPLAIN NOTOTHREADED, with a mate- rial serviceable for temperatures of 375°F or greater.

ss$O NOTOPIPE THEHDISCHARGE TO ANYYPLACEAWHEREEFREEZING COULDU OCCUR

ss.O SHUTOFFTVALVE shall be installed between the relief valve and boiler,

OR IN THEHDISCHARGEHLINEN$O NOTOPLUG OR PLACEAANYNOBSTRUCTIONUIN THEH discharge line.

ss&AILURE 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.

ss4ESTSTHEHOPERATIONAOF THEHVALVE 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.

Table 3 Water pipe size (based on 20°F rise)

Boiler model	To	From
	system	system
CGa-25	¾"	¾"
CGa-3, 4, 5	1"	1"
CGa-6, 7	1 ¼"	1 ¼"
CGa-8	1 ½"	1 ½"

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.

#HILLERSSOR AIR HANDLING UNITS:

Install boiler such that —

ss#HILLEDLMEDIUMIIF USEDEIS PIPEDPIN PARALLEL WITH heating boiler. Use appropriate valves to prevent

CHILLEDL MEDIUM FROM ENTERING BOILERL #ONSULT )"2")NSTALLATION AND 0IPINGT'UIDES

s)F BOILER IS CONNECTEDETO HEATINGTCOILSILOCATEDAIN 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

COOLINGLCYCLE #IRCULATIONLOF COLD WATERTTHROUGHOTHEH boiler could result in damage to the heat exchanger, causing possible severe personal injury, death or substantial property damage.

16 Part Number 550-101-009/0107