Weil-McLain Gold CGs-4E Instructions d'exploitation télécharger pdf (Page 18)

Part number 550-110-282/1108

GOLD

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

Piping — low temp systems3d

Failure to prevent low return water temperature to the boiler could cause corrosion of

the boiler sections or burners, resulting in severe personal injury, death or substantial

property damage.

Radiant heating system piping should include a means of regulating the boiler return

water temperature

and the system supply temperature (such as provided by an injec-

tion pumping control

 Boilerreturnwatertemperaturewillbeadequatelycontrolledusingthemethodsshown

in this manual provided the system supply temperature is relatively constant.

DO NOT apply the methods of this manual if the system is equipped with an outdoor

reset control.

Instead, provide controls and piping which can regulate the boiler re-

turn water temperature

at no less than 130°F regardless of system supply temperature.

ContactyourWeil-McLainrepresentativeforsuggestedpipingandcontrolmethods.

Failure to prevent cold return water temperature to the boiler could cause corrosion

damage to the sections or burners, resulting in possible severe personal injury, death or

substantial property damage.

Primary/secondary (preferred)

bypass piping method

Primary/secondary bypass piping is preferred because

the flow rate and temperature drop in the heating

circuit(s) is determined only by the heating circuit

circulator(s).Soadjustment of the bypass valves in

the boiler circuit will not cause a change in the heating

circuit rate and temperature distribution.

Figures 8 and 9, page 19, show suggested bypass ar-

rangements using primary/secondary bypass piping

(preferred) for low temperature systems such as radiant

heating systems

or converted gravity systems. For

alternatives, see pages 20 through 23.

The bypass valves in

Figures 8 and 9 (items 7a and 7b)

provide mixing of hot boiler outlet water with cooler

system return water — set to assure a minimum return

watertemperature(atleast130°F)totheboiler.Setthe

valves as explained below.

Temperature gauges

Gauge4a is suggested, but optional on any system.

Gauge

4b is optional on converted gravity systems,

but required on radiant heating systems — to display

the water temperature being supplied to the radiant

tubing.

Gauge

8 is required on all systems to assure the return

water temperature is accurately set for a minimum of

130°F.Ifthisgaugeisnotavailablehowever,adjustthe

valves such that the boiler-mounted temperature/pres-

suregaugereadsatleast150°Fwhenthesystemreturn

wateriscold(approximately60°Fwatertemperature).

Valve adjustment

(Figures 8 and 9 only)

1. Setthevalveswhilethesystemiscool,settingforthe

coldestexpectedwatertemperature(usually60°F

since the system will often drop to room tempera-

ture between cycles).

2. Startwithvalve

7a fully closed and 7b fully open.

3. Graduallyopenvalve

7a while closing valve 7b until

the temperature at gauge 8reads130°Fwhengauge

4areads60°F.

4. Notethatvalve

7a regulates the amount of hot wa-

ter from the boiler supply which mixes with return

water.Valve7b regulates the amount of system water

ﬂowing through the boiler secondary loop.

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Weil-McLain Gold CGs-4E Instructions d'exploitation Page 18

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