Winter / Summer Optional Kit
6
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.
SYSTEM LAYOUT FOR WINTER/SUMMER WATER HEATING SYSTEM (See Figure 4)
1) Install a properly sized expansion tank. An air separator and vent is recommended to eliminate air in the
system.
2) A pressure reducing valve is recommended for installation to maintain appropriate pressure in the closed
loop system.
3) The circulator should be installed to “pump away” from the expansion tank as shown.
4) Purge all air from the filled, closed system.
Figure 4 – Piping for Boiler Application (Winter/Summer)
CONNECT WATER BOILER SUPPLY PIPING
1. For boiler system connections, refer to Figure 4. 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.
FILL BOILER SYSTEM
1. On new boiler installations, do not purge the boiler or space heating system through the water heater.
During any boiler or space heating system flushing, cleaning, or purging, the water heater should be
isolated to avoid possible attack on the carbon steel coil by chemical additives.
2. Purge air from boiler/water heater piping.
3. Check system for leaks. Repair as necessary.
Refer to the Installation and Operating manual that came with the water heater for instructions on the water
heater standard operations.