Installation / Operation Instruction Manual

19
Water Connections continued-
INSTRUCTIONS FOR BOILER CONNECTIONS
The indirect-fired heater connection labeled “To Boiler Return”
should be piped to the boiler return piping as close to the boiler as
possible and especially after any flow control or check valves in
the space heating return piping. The use of a union and a shut-off
valve is recommended. The use of a flow control or check valve is
required to prevent back flow through the water heater during
operation of the space heating system. Pipe and fittings between
the boiler and indirect-fired water heater should be ¾” diameter or
larger.
CONNECT WATER BOILER SUPPLY PIPING
1. For a space heating system that utilizes ZONE VALVES, refer
to Figure 2. The indirect-fired water heater connection labeled
“FROM BOILER SUPPLY” should be piped to the boiler supply
piping. Mount the circulator making sure the flow arrow points
toward the water heater. The use of shut-off valves and unions
are recommended for future service convenience. The use of
an air separator and vent is recommended to eliminate air in
the system. Pipe and fittings between the boiler and indirect-
fired water heater must be ¾” diameter or larger.
CAUTION
Maximum boiler water supply temperature to the indirect
heat exchanger must not exceed 240°F (116°C).
Figure 2 - Water Boiler Piping with Zone Valves