W415-1013 / C / 11.19.13
60
EN
○
Control of the secondary heat source (either electric or oil) is done by a combination of a selector switch
on the main furnace control panel and a second thermostat located beside and at the same height as the
wood furnace thermostat. The selector toggle switch needs to be switched to the appropriate back up
furnace installed (can be switched to either oil or electric depending on energy rates if both backups are
installed). The thermostat for the back up heat source should be set 4°F to 5°F (2°C to 3°C) below the
setting for the wood thermostat. Thus once the heat from the wood section starts to decline, the corre-
sponding decline in room temperature will cause the second thermostat to call heat from the secondary
heat source. Note that interlocks in the control system will force the secondary heat source to shut down if
the temperature in the supply plenum of the wood furnace exceeds the set value of the "High Limit" switch
(250°F) (121°C).
NOTE
The control of the "Add On" style installation is the same as the fore mentioned paragraph except for the
position of the selector toggle switch being redundant.
○
A summer fan switch has been added to the main electric control box. This will provide low speed air
circulation during the summer time when the furnace is not being used. Depress rocker switch to “Summer
Fan” position, the switch will light and the fan will run.
○
There is also an override switch located on the wood/oil fan/limit switch. This should always remain pulled
out in the “AUTO” position (pushing the button in will cause the fan to operate on high speed).
○
As an alternative, when the wood furnace is connected in a “Add On” con
fi
guration with a back up furnace,
the continuous fan call on the back up thermostat, can be used to circulate air in the non-heating season.
○
Under no circumstances should any method (Summer Switch, Override Switch on Fan/Limits, Continuous
Fan Mode on Back Up Furnace Thermostat) be used to provide continually circulating air when the wood
furnace is being operated.
○
An HRV (Heat Recovery Ventilation System), can be connected to the HVAC system but must
NOT
be
connected in such a way that it controls the operation of the circulation blower. The control logic shall be
such when the wood furnace (or back up furnace in an “Add On” con
fi
guration) turns on the circulation
blower, this should signal the HRV to operate.
8.2 CONTROL SYSTEM - SECONDARY FURNACE "ADD ON", "WOOD/OIL",
"WOOD/ELECTRIC", "WOOD/OIL/ELECTRIC" CONFIGURATIONS
8.3 CONTROL SYSTEM - SUMMER FAN/CONTINUOUS FAN/HRV’S
H3.64
BOTH OIL AND ELECTRIC FURNACES HAVE RESET CONTROLS AND PROCEDURES REQUIRED TO
RESTART THE UNITS IF A FAULT HAS BEEN DETECTED AND UNITS LOCKED OUT. ONLY A QUALI-
FIED INSTALLER/SERVICE PERSON SHALL PERFORM THESE RESET PROCEDURES AS A CAUSE
AND REPAIR MUST BE DETERMINED BEFORE THE UNIT CAN BE RESTARTED. FAILURE TO FOL-
LOW THIS STEP COULD RESULT IN PROPERTY DAMAGE, INJURY OR DEATH.
SERVICE PERSONS CAN FIND TROUBLESHOOTING AND RESET PROCEDURE IN THE MANUALS
ACCOMPANYING BOTH THE ELECTRIC FURNACE AND OIL BURNER MODULES.
