PB Heat Peerless Boilers GM Series, Инструкция по установке, эксплуатации и обслуживанию

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b. When system return water temperature will
be below 130°F (54°C), pipe the boiler with a
bypass arrangement to blend the system return
and hot supply to obtain at least 130°F (54°C)
entering the boiler. For more information on
bypass piping, consult the PB Heat Water
Installation Survey.
c. 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. See Figure 3.4.
d. 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.
B. SAFETY RELIEF VALVE
1. Locate safety relief valve and nipple in trim carton.
2. Install safety relief valve in 3/4 NPT tapping behind
supply tapping. Safety relief valve must be installed
with spindle in vertical position. See Figure 3.5.
C. LOW WATER CUT-OFF
Low water cut-off feature is incorporated in the
Hydrolevel 3200 Control with standard Electro-Well.
The low water cut-off featrue is recommended on all
installations, and is required if boiler is installed above
radiation level or where required by local code. See
Hydrolevel manual for details.
Figure 3.4: Parallel Hook-up with Water Chiller
WATER PIPING & CONTROLS
Figure 3.5: Safety Relief Valve Installation
Figure 3.3: Drain Valve Installation
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
Low water temperatures can deteriorate the vent
system, which can result in flue gas spillage and
carbon monoxide emissions.
WARNING