Instructions / Assembly

331552-002 – 23 –
5. The air handler (fan coil) and/or the circulating pump
in a baseboard hydronic loop will require a dedicated
120V circuit. This must be provided and identified for
this purpose.
6. All piping between the water heater and the air handler or
hydronic baseboard loop must be adequately insulated
to reduce heat loss.
7. If the local jurisdiction requires a back-flow preventer in
the cold water line, an expansion tank of adequate size
must be installed.
8. “Combo” Heating Systems require higher water
temperatures than other applications. When the system
is used to supply water for Combo Heating applications, a
means, such as mixing valve, must be installed to temper
the water in order to reduce scald hazard potential (see
Figure 17 through Figure 19).
Installation
The heating mode may be one of the following options:
1. A fan coil/air handler (Figure 17).
2. A hydronic baseboard (finned tube) loop (Figure 18).
3. A hydronic in-floor heating loop (Figure 19).
The following is a list of requirements for the installation of
the heating loop to the water heater.
1. Install shut-off valves and unions so that the water heater
can be isolated from the heating module should servicing
of the water heater become necessary.
2. Install a drain valve at the lowest point of the heating loop
so that water can be drained from the heating module
without affecting the water heater.
3. If the air handler does not have a venting means at the
highest point of the piping arrangement, install an air
bleed at the highest point of the plumbing arrangement.
4. If solenoid valves are used for zone heating applications,
they must include electrical proof of valve full open
position and must be connected to the water pump.
WATER
HEATER
200mm TO
300mm (8 in.
TO 12 in.)
HOT
OUTLET
EXPANSION TANK
(OPTIONAL)
MIXING
VALVE
COLD
INLET
CHECK VALVE (IF
USED REQUIRES
EXPANSION TANK)
COLD
SUPPLY
HOSE BIB
(OPTIONAL)
FLOW
CONTROL
SUPPLY
RETURN
CHECK
VALVE
EXTERNAL
CIRCULATOR
AIR HANDLER
HOT WATER
TO HOUSE
FIXTURE
C
H
M
INTERNAL
CIRCULATOR
DRAIN/PURGE
VALVE
Figure 17. Combo Heating - Air Handler
WATER
HEATER
200mm TO
300mm (8 in.
TO 12 in.)
HOT
OUTLET
EXPANSION TANK
(OPTIONAL)
MIXING
VALVE
COLD
INLET
CHECK VALVE (IF
USED REQUIRES
EXPANSION TANK)
COLD SUPPLY
HOSE BIB
(OPTIONAL)
FLOW
CONTROL
SUPPLY
RETURN
CHECK
VALVE
EXTERNAL
CIRCULATOR
HYDRONIC
BASEBOARDS
(SERIES
CONNECTED
SHOWN)
HOT WATER
TO HOUSE
FIXTURE
C
H
M
Figure 18. Combo Heating - Baseboard
WATER
HEATER
200mm TO
300mm (8 in.
TO 12 in.)
HOT
OUTLET
EXPANSION TANK
(OPTIONAL)
MIXING
VALVE
COLD
INLET
CHECK VALVE (IF
USED REQUIRES
EXPANSION TANK)
COLD SUPPLY
HOSE BIB
(OPTIONAL)
FLOW
CONTROL
SUPPLY
RETURN
CHECK
VALVE
EXTERNAL
CIRCULATOR
HYDRONIC
IN-FLOOR
LOOP
HOT WATER
TO HOUSE
FIXTURE
C
H
M
Figure 19. Combo Heating - In-Floor Loop