Lennox International Inc GWB8-299E-2 Temperature Pressure Gauge, For USE with Cooling Units

!WARNING

Burn and scald hazard. Safety relief valve could discharge steam or hot water during operation. In- stall discharge piping per these instructions.

1.Boiler is shipped assembled. Install discharge piping from safety relief valve. See Warning, Page 7.

2.Install temperature pressure gauge.

•Apply pipe sealant to threads on shaft of gauge.

•Thread gauge into supply water tee. See Figure 3.

NOTICE

DO NOT TIGHTEN GAUGE BY HAND!! Gauge should be tightened using crescent wrench or 9/16” open end wrench. See Figure 3.

3.Connect supply and return lines to boiler. Connections may require additional fittings and parts, as shown on diagrams.

Figure 3 - Temperature Pressure Gauge

Verify clean water supply is available to water inlet valve. Install sand strainer when water supply is from a well or pump.

Install hot water boiler above radiation level or as required by Authority having jurisdiction install low water cutoff device at time of installation. Periodic inspection is necessary, as is flushing of float type devices, per manufacturers specific instruction.

FOR USE WITH COOLING UNITS

A. Boiler used in connection with refrigeration system, must be installed so that chilled medium is piped in parallel with heating boiler. Appropriate valves must be used to prevent chilled medium from entering heating boiler. See Figure 5 page 9.

B. Boiler connected to heating coils located in air handling units where they may be exposed to refrigerated air circulation, piping system shall be equipped with flow control valves or other automatic means to prevent gravity circulation of boiler water during cooling cycle.

LOW WATER TEMPERATURE AND LARGE WATER CONTENT SYSTEM (See Figures 6 and 7, Page 10.)

Significant condensation may form in boiler and/or venting system if boiler is operated for long period of time with return temperatures of less than 120° F.

Condensate is corrosive and can cause severe damage to boiler and venting system. Minimum design return water temperature to prevent condensation in boiler and venting is 120°F. Minimum high limit setting is 140°F.

1.Boiler used in heating system where design water temperatures below 140°F are desired (e.g. radiant floor heating), 4-way mixing valve or suitable alternative is required to prevent low temperature return water from entering boiler. Follow mixing valve manufacturer’s instructions.

2.Boiler connected to system having large water content (such as former gravity system), install system bypass. See Figures 6 and 7, page 10.

3.If boiler water reset control is used to operate boiler, minimum reset supply water temperature setpoint must be at least 140°F, unless mixing valve is used as in (1) above.

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