PB Heat 211A manual Install Controls and Trim, Install Safety Valves Install LOW Water CUT-OFFS

INSTALL CONTROLS AND TRIM

8. INSTALL CONTROLS AND TRIM

A. INSTALL SAFETY VALVE(S) C. INSTALL LOW WATER CUT-OFF(S)

1.Pipe the pop safety valve(s) in the 3" tappings located on the right or left end sections. Make sure the relief valve sizing meets local code requirements.

CAUTION

Pipe the discharge of the Safety Relief Valve(s) away from any traffic area, preferably to a floor drain. This is necessary to prevent injury should the valve discharge.

Pipe the discharge full size of valve outlet.

B.INSTALL BLOWDOWN VALVES

1.Install a 1-1/2" full port ball valve in each of the tappings provided at the lower back of the end sections. See Figure 8.1.

2.Pipe the valve discharge to a floor drain if available or apply a nipple and cap to close off when not in use.

Figure 8.1: Blowdown Valve Piping

1.Mount the float type low water cut-off and gauge glass in the tappings provided in the front of either end section.

2.Do not apply piping which would raise or lower the location of the cut-off relative to the tappings in the boiler. Raising the water level over the design height will cause water carryover to the system.

3.For correct location of typical low water cut-off/feeder or low water cut-off/pump control, see Figures 8.3 through 8.6.

4.Mount the probe type low water cut-off supplied with the boiler. The end sections have 3/4" tappings in the front for mounting the probe low water cut-off auxiliary control. See Figure 3.3.

a.The standard probe control is Hydrolevel Model 650P. This control is automatic reset type.

b.When a manual reset control is required, the boiler can be supplied with Hydrolevel Model 550P.

5.Provide each float low water cut-off with a blowdown valve. Pipe the blowdown away from traffic to a floor drain if available. The blowdown valve is required for proper maintenance of the control.

6.Maintain a height of 40-1/2" (1029 mm) from boiler foundation to the normal water level.

7.When using multiple float type Controls: Always pipe the controls off of the same tappings to the boiler. Do not mount on different ends of the boiler or in different tappings. This can cause erratic operation and nuisance problems with the controls.

D.INSTALL PRESSURE CONTROLS

1.Pipe the Steam Pressure Gauge and Boiler Limit and Operating Pressure Controls as shown in Figure 8.2. Connect the control assembly to the 1/2" tapping on the right end of the boiler.

CAUTION

Make sure that the gas ignition system components, electrical controls, junction boxes and electrical panels are protected from water (dripping, spraying, rain, etc.) during boiler operation and service (circulator or pump servicing, control replacements or other).

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