Heatmaster
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G Series Furnace Operating Manual
12
G
SERIES
Boiler Safety
•
Operate the boiler periodically to ensure that it will operate
satisfactorily when needed.
•
Do not relocate or bypass any of the safety controls in the
original boiler installation.
•
The operation of the boiler must be verified for acceptable
operation before and after installation of the add-on
appliance by a gas fitter who is recognized by the
regulatory authority.
•
Do not connect to any chimney or vent serving a gas
appliance.
Installation should comply with requirements of CAN/
CSA-B365, and changes to the installation should comply
with CSA-B139 (for oil-fired boilers), C22.1 (for electric
boilers), or CAN/CSA B149.2 (for gas-fired boilers).
DOMESTIC HOT WATER
Flat plate exchanger systems used to pre-heat domestic
water tanks are generally more reactive to hot water
demands then tube and shell systems. However, tube and
shell exchangers hold up better when hard water is present.
Forced Air Furnace (Water-To-Air Exchanger)
The water-to-air heat exchanger must be mounted so that
air blows through the fins (coils). The exchanger should
be mounted below the A/C coil if possible. The exchanger
should be sized to fit existing duct-work and should
produce about as many BTU’s as the existing heat source.
An exchanger that produces too many BTU’s will result in
uneven heat and the fan stopping too quickly while a heat
exchanger that is undersized will not produce the necessary
BTU’s. The heat exchanger can also be placed into the cold
air portion of the duct-work but it is not recommended
because some furnaces have an overheat shut off if the fan
overheats as a result of blowing hot air instead of cold air.
It is important that the warm-air supply-duct system is
constructed of metal in accordance with NFPA 90B-1993,
2-1.1. If the outlet-air temperature of a central furnace
exceeds 250 degrees F (121 degrees C) when it is tested in
accordance with the requirements for simultaneous firing in
56.4.1 and 56.4.2 of the standard. It is also important that
the plenums installed to the furnaces are constructed of
metal in accordance with NFPA 90B-1993, 2-1.3.
Overhead fan coil installation example
Example of hookup for a forced air furnace and hot water.