7
8.3) Special note concerning low
temperature systems
For proper operation and to prevent condensation on
the external surfaces of the heat exchanger, the return
temperature of your HGC unit must always exceed
100°F
. A transition period below that temperature is
acceptable, but a permanent return temperature below
100°F voids your warranty.
8.4) Use of glycol as thermal fluid
It is permissible to use a mixture of water and glycol as
thermal fluid in the heat exchanger of the boiler. The
proportion of glycol in the mixture must not exceed 50%.
9) DRAFT HOOD
The draft hood shipped with your HGC unit must be
installed without any modifications and fastened to the
collar of the appliance with the help of metal screws.
10) VENTING
10.1) Chimney
WARNING
An inadequate chimney can result in an
improper unit operation.
The chimney must have sufficient draft to ensure
normal, safe operation of the appliance. Consult the
installation code CAN/CGA B149. Also, the installation
must conform to regulations of authorities having
jurisdiction.
PART 2
OPERATION
1) FUEL
Use only natural gas or propane gas. Never use any
other type of gas.
2) STARTING UP YOUR SYSTEM
2.1) Filling your system with water
All existing piping must be drained and cleaned with
fresh water before filling the new HGC unit.
1. Close all manual air vents and open the cold water
feed valve to fill the system slowly.
2. Purge the air from the system by letting the
circulating pump run. Check for proper operation of
the automatic air vents and manually actuate the
manual air vents.
3. Check the water level in the expansion tank. It
should be one quarter full.
4. Check the system pressure and adjust the pressure
regulator as needed.
5. Check the system for leaks after the unit has
reached normal operation temperature.
2.2) Lighting the pilot
WARNING
On all types of ignition, wait a minimum of 5
minutes before attempting to relight the pilot.
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