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IMPORTANT: Circulators in the following illustrations are mounted on the system supply side, but
mounting on the system return side is also acceptable practice.
SUPPLY PIPING
TO HEATING
AND COOLING
ELEMENT
CIRCULATOR
RETURN PIPING
FROM HEATING
AND COOLING
ELEMENT
1.
Connect supply and return piping as suggested in Figure
#5 when the boiler is used in connection with refrigerated
systems.
A.
The chilled medium MUST BE PIPED IN PARALLEL
with the boiler.
B.
Use appropriate valves to prevent the chilled medium
from entering the heating boiler.
- During heating cycle open valves A and B, close
valves C and D.
- During cooling cycle, open valves C and D, close
valves A and B.
C.
Maintain a minimum clearance of one inch to hot water
pipes.
When the boiler is connected to heating coils located in air
2.
CONNECTING SUPPLy & RETURN PIPING
C
WATER
CHILLER
D
CHECK
VALVE
Figure #5
GATE
VALVE
PROPER
BACKFLOW
PROTECTION
FEED
DEVICE
WATER
B
handling units where they may be exposed to refrigerated
air circulation, the boiler piping system MUST BE sup-
plied with flow control valves or other automatic means
to prevent gravity circulation of the boiler water during the
cooling cycle.
Hot water boilers installed above radiation level must be
3.
provided with a low water cut-off device.
When a boiler is connected to a heating system that
4.
utilizes multiple zoned circulators, each circulator must
be supplied with a flow control valve to prevent gravity
circulation.
Hot water boilers and system must be filled with water
5.
and maintained to a minimum pressure of 12 pounds per
square inch.
7
PRESSURE
REDUCING
VALVE
A
EXPANSION
TANK
PURGE
VALVE
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