Operation and Installation Manual
9
1.
Connect supply and return piping as suggested in
Figure #5, below. When boiler is used in connection
with refrigerated systems:
A. Chilled medium MUST BE IN PARALLEL with boiler.
B. Use appropriate valves to prevent chilled medium
from entering heating boiler.
2.
During heating cycle open valves A and B, close valves
C and D.
3.
During heating cooling cycle open valves C and D, close
valves A and B.
A. Maintain minimum clearance of one inch to hot
water pipes.
In air handling units where they may be exposed to
refrigerated air circulation, boiler piping system MUST be
supplied with ow control valves or other automatic means
to prevent gravity circulation of boiler water during cooling
cycle.
4.
Hot water boilers installed above radiation level must
be provided with low water device either as part of
boiler or at time of boiler installation.
5.
When boiler is connected to heating system utilizing
multiple zoned circulators, each circulator must be
supplied with ow control valve to prevent gravity
circulation.
* Reduced pressure back ow preventer must be used
under provisions required by the Environmental
Protection Agency, (EPA).
6.
Bypass piping is an option which gives ability to
adjust supply boiler water temperature to t system
or condition of installation. Although, this method of
piping is not typically required for baseboard heating
systems.
CONNECTING SUPPLY AND RETURN PIPING
Figure #5 Typical Piping Conguration