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Expansion Tanks
Expansion tanks are only required for “Closed
Systems”. The expansion tank has an air
bladder, which will contract to relieve pressure in
the system. Pressure is created in the closed
system when water is heated in the water heater.
Expansion tanks should always be connected to
the cold water piping between the water heater
shut off valve and the cold water inlet to the
water heater. Follow manufacturers instructions
for sizing and installation.
Anti-Scald Valve
An anti-scald valve is required when the water
heater thermostat is set above 140˚F (60˚C).
Also, an anti-scald valve may be required for all
installations by the “authority
having jurisdiction”.
The valve is placed in the hot water supply
piping from the water heater downstream of the
heating loop connection and upstream of any
domestic hot water connection.
The purpose of the valve is to limit the maximum
temperature available for domestic hot water by
mixing hot water from the water heater with cold
water from the municipal supply.
The Anti-Scald valve must be thermostatically
controlled and approved to the ASSE standard No.
1016 and 1017 for use as an anti-scald device.
Note: There are a number of pressure balancing
valves and mixing valves on the market which are
not certified as a anti-scalding device.
Off Season Circulation Controls
(Models with a ‘T’ in the model number)
Although the UCG (Unified Canadian Guideline)
does not require these controls, a few building
codes and municipal by-laws do. They are used
to provide periodic circulation of water through
the space heating loop during the summer and
other periods of infrequent use. The concern is
that water which remains stationary in the
heating loop during the summer may be less
than desirable as domestic hot water when it is
returned to the water heater at system startup
in the fall.
Thermostats
There are two thermostats controlling every
combo system, the water heater thermostat
controlling the hot water temperature and the room
thermostat controlling the room air temperature.
9
cold
water
air cushion
hot
EXPANSION TANKS
Time to Scald
(1st degree burns)
Temperature Time
120˚F 8 min.
130˚F 20 sec.
140˚F 3 sec.
160˚F <1 sec.