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VI) COMBO HEATING
WARNING:
Keep the area around the heater clear and
unobstructed.
This section serves as a guide for the installation and use
of "Combo" heating systems utilizing a domestic water
heater that has been specifically approved for such use. It is
written for those knowledgeable in the required trades and
professionals involved in the design and installation of Combo
Heating Systems.
It is the responsibility of the installer/designer to follow all
applicable codes to ensure the effectiveness and safety of
the installation.
This appliance has been design certifi ed as complying with
American National Standard/CSA Standard for water heaters
and are considered suitable for Water (Potable) Heating and
Space Heating. Note: This water heater may be used in
combination potable water/space heating system. Do not use
in a space heating only application.
WARNING
Toxic Chemical Hazard
• Do not connect to non-potable water system.
Read Before Proceeding
CAUTION:
Keep safety your first priority. Take all pre-
cautions to avoid creating a fire, health or
safety hazard.
The following requirements must be met for the installation
of Combo Heating Systems:
1. All components used for the distribution of water in the
heating loop must be suitable for potable water. These
include all piping, fittings, solder and fluxes, pumps for
circulation of water, valves, etc.
2. The water heater must not be connected to a hydronic
heating system that has been used previously with
nonpotable water.
3. No boiler treatment chemicals of any kind shall be
introduced into the system.
4. The Combo System components must be selected and
sized to meet and maintain the total calculated demands
for both domestic service hot water and space heating
requirement. The sizing and installation must be performed
in accordance with good engineering practice such as
"ASHRAE Handbooks", HRAI, "Hydronics Institute
Manuals", B139, NFPA 31, ANSI Z223.1, CSA F280,
National/Provincial Building Codes, CSA C22.1, ANSI/
NFPA 70, CSA B51 and/or codes having jurisdiction.
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 15 through Figure 17).
Installation
The heating mode may be one of the following options:
1. A fan coil/air handler (Figure 15).
2. A hydronic baseboard (finned tube) loop (Figure 16).
3. A hydronic in-floor heating loop (Figure 17).
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.
HOT WATER
TO HOUSE
FIXTURE
MIXING
VALVE
C
M
H
200mm TO
300mm (8 in.
TO 12 in.)
HOT
OUTLET
WATER
HEATER
Figure 15 Combo Heating - Air Handler
– 23 –
COLD
SUPPLY
CHECK VALVE (IF
USED REQUIRES
EXPANSION TANK)
EXPANSION TANK
(OPTIONAL)
CHECK
FLOW
VALVE
CONTROL
COLD
INLET
SUPPLY
AIR HANDLER
EXTERNAL
CIRCULATOR
HOSE BIB
(OPTIONAL)
RETURN
DRAIN/PURGE
VALVE
INTERNAL
CIRCULATOR
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