9
1. Connect supply and return piping as suggested in
figure #5
, below. When the boiler is used in connection
with refrigerated systems:
A. The chilled medium MUST BE IN PARALLEL with
the boiler.
B. Use appropriate valves to prevent the chilled medium
from entering the heating boiler.
2. During the 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 a minimum clearance of one inch to hot
water pipes.
In air handling units where they may be exposed to
refrigerated air circulation, the boiler piping system MUST
be supplied with flow control valves or other automatic
means to prevent gravity circulation of the boiler water
during the cooling cycle.
4. Hot water boilers installed above radiation level must be
provided with a low water device either as part of the
boiler or at the time of boiler installation.
5. When a boiler is connected to a heating system that
utilizes multiple zoned circulators, each circulator
must be supplied with a flow control valve to prevent
gravity circulation.
* reduced pressure back flow preventer must be used under
provisions required by the Environmental Protection
Agency, (EPA).
6. Bypass piping is an option which gives the ability to
CONNECTiNG SUPPLy ANd RETURN PiPiNG
Figure #5