PB Heat MI/MIH series - Manual (Page 10)

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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