Weil-McLain Gold CGs-4E Instructions d'exploitation télécharger pdf (Page 14)

Part number 550-110-282/1108

GOLD

CGs-4E Gas-Fired Water Boiler — Boiler Manual

Water piping —

general information

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

Boiler

model

number

system

From

system

CGs-4E

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.

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rstcontrol.Maximumallowablesetpointis240°F.See

Section9b, page 34 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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.

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 4 or 5,

page 15, and the tag attached to the relief valve for manufacturer’s instructions.

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llconnection

at the same point as the expansion tank connection to

the system. Figures 4 and 5, page 15, show typical near-

boiler piping connections.

System water piping

SeeFigure 4 (diaphragm-type or bladder-type expan-

sion tank) or Figure 5 (closed-type expansion tank) on

page 15, and Table 3 below, for near-boiler and single-

zonesystemsdesignedforreturnwateratleast130°F.

Seepages16-17tocompletemultiple-zonepipingor

pages 18-23 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).

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.

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oor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.

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Weil-McLain Gold CGs-4E Instructions d'exploitation Page 14

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