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08/30/2007 11
EI203
6.
SPECIAL STANDBY FURNACE AND CERTAIN PLENUM WIDTH CONDITIONS - As we continue
gathering installation experience, we are seeing several over temperature situations reoccurring. The intent
of this paragraph is to provide additional help for four specific plenum conditions:
a.
Large burner pot oil furnace with the HeatChoice installed less than about 6" from the top of the
heat exchanger/fire pot.
-
Install from either the back or front (inline with the flue or burner)
b.
HeatChoice installed from either side of an oil furnace.
-
Locate as high as possible above the oil furnace, but realizing elements need to be inline
or below take off ducts
c.
Plenums width between 19" and 2ؽ"" without the use of side deflectors.
-
Add deflectors per drawing EH101, C-1
d.
HeatChoice installed above an A-coil where the HeatChoice sits directly on top of the A-coil
without side deflectors.
-
Add deflectors per drawing EH101, C-1
ADDITIONAL APPLICATIONS
Oil furnace
– isolation contacts are
required at oil burner control “T and
T” and terminals. If you do not have a
fan center with proper isolated contact
closure for “T and T”, you must add a
relay as shown.
Furnace variable speed blower –
a
fifth wire connection may be needed to
speed up the gas furnace blower for air
conditioning and HeatChoice electric
heating operation. Add jumper and the
fifth wire to the gas furnace “Y”
terminal as shown on the diagram.
Note:
Connection wires shown are in
addition to 4-wire thermostat and 4
wires to furnace.
Load Control, other Electro products – on HeatChoice control board, bottom right, connect blues to COM and
EL.