PB Heat EC Series, ECT Series manual Controls, Use only the Hydrolevel CG450 as

PIPING AND CONTROLS

F.CONTROLS

Pipe the discharge of the safety CAUTION valve or relief valve to prevent injury

in the event of pressure relief. Pipe the discharge to a drain. Provide piping that is the same size as the relief valve.

1.Water Boiler Controls:

Install the limit / operating control, pressure- temperature gauge and safety relief valve. See Figure 7.1 (Section 7) for proper location. For installations subject to UL726, a second operating control that senses water temperature is also required (not provided). Use an L4080B or equivalent. Install in the supply piping near the boiler.

2.Steam Boiler with Float Low Water Cut-Off:

Install pressure limit control, pressure gauge, gauge glass trim and safety valve. See Figure 3.8, Figure 3.9, and Figure 7.1 (Section 7). See also control manufacturer's instruction sheet shipped with the control.

3.Steam boilers with Probe Low Water Cut-Off:

Use these components along with the gauge glass handles and other components from the Steam Trim Carton and install fittings and controls per Figure 3.10.

The shorter gauge glass located in the Steam Trim Carton is not necessary for the probe application.

4.Steam boilers subject to UL726:

For installations subject to UL726, a second operating control that senses steam pressure is required (not provided). Use a PA404A or equivalent. On probe boilers, install the additional pressure control opposite the standard PA404A using a cross instead of a tee along with a second brass siphon (not provided). On float boilers, install the additional pressure control in the location normally used for the standard PA404A on steam-probe boilers (fittings not provided).

5.For complete information on servicing and adjustment of controls, refer to the attached control specification sheets.

Use only the Hydrolevel CG450 as

CAUTION a primary probe low water. The CG450 includes a cycle timer to sense water level under foaming or surging conditions. Failure to use this model could result in a failed heat exchanger.

Probe models use a longer gauge glass than float models. The following components are packed in the Probe Carton (90759):

·Hydrolevel CG450 LWCO

·Gauge glass 22-162-10

·3/4"x 3" nipple

·3/4" x 3/4" x 1/4" tee

·(2) 1/2" couplings

Figure 3.8: Steam Boiler with Float Low Water Cut-Off

Figure 3.9: Assembling Float Low Water Cut-Off

Figure 3.10: Steam Boiler with Probe Low Water Cut-Off

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