PB Heat DE User Manual download pdf (Page 10)

6. Install this boiler so that the gas ignition system

components are protected from water (dripping,

spraying, etc.) during appliance operation and

service (circulator replacement, condensate trap,

control replacements, etc.).

7. If this boiler and distribution system is used in

conjunction with a refrigeration system, pipe the

chilled medium in parallel with the boiler and install

the proper valve to prevent the chilled medium from

entering the boiler. A drawing illustrating this hook-

up is provided in Figure 3.2.

8. When the boiler is connected to heating coils located

in air handling units where they may be exposed to

refrigerated air circulation, install flow control valves

or other automatic means to prevent gravity

circulation of the boiler water during the cooling

cycle.

9. If this boiler is installed above radiation level,

provide a low water cutoff device, either as a part of

the boiler or at the time of boiler installation.

B. SAFETY RELIEF VALVE

1. Locate safety relief valve and fittings in bag

assembly.

2. If air elimination is not required at the safety relief

valve tapping, install valve and piping as shown in

Figure 3.3.

3. For air elimination at the safety relief valve tapping,

install valve and piping as shown in Figure 3.4.

Pipe the discharge of safety 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 safety relief valve outlet.

CAUTION

Figure 3.4: Safety Relief Valve Hook-Up with

Air Elimination

Figure 3.3: Safety Relief Valve Hook-Up

Installation with Air Elimination in

System Piping

Figure 3.2: Parallel Hook-up with Water Chiller

WATER PIPING AND CONTROLS

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PB Heat DE User Manual Page 10