9
5. 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.).
6. 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.
7. 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 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.
C. LOW WATER CUT-OFF
Low water cut-off feature is incorporated in the
Hydrolevel Control with standard Electo-Well. The low
water cut-off feature 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.
WATER
CHILLER
BOILER
SUPPLY LINE
CHECK VALVE
THREE WAY
VALVE
RETURN
LINE
Figure 3.2: Parallel Hook-Up with Water Chiller
WATER PIPING & CONTROLS
Figure 3.3: Safety Relief Valve Hook-Up
Installation with Air Elimination in
System Piping
TO DRAIN
SAFETY
RELIEF
VALVE
3/4" X 6"
NIPPLE
SUPPLY
Figure 3.4: Safety Relief Valve Hook-Up with
Air Elimination
TO DRAIN
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