Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 20 Date printed: February 15, 2008
ADD-ON TO GAS FURNACE
The VC120 may be connected to a gas furnace having a rated input of up to 140,000 BTU.
Minimum blower capacity must be at least 900 cfm. A counter flow gas furnace may be used
with an interconnect duct as indicated in Fig 1. A regular up flow gas furnace may be used and
connected as per Fig 1. The VC120 can be located on either side of the gas furnace. Minimum
interconnect duct size is 10" x 18" with minimum 6" inside radius elbows. Do not, under any
circumstances, connect the VC120 flue to a chimney that also vents the gas furnace. The wood
furnace requires a chimney approved for solid fuel use. Maintain clearances to all combustibles.
Refer to general instructions portions of this manual also.
THE OPERATION OF THE GAS FURNACE MUST BE VERIFIED FOR ACCEPTABLE
OPERATION, BEFORE AND AFTER INSTALLATION OF THE ADD ON, BY A GAS FITTER
WHO IS RECOGNIZED BY THE REGULATORY AUTHORITY. DO NOT CONNECT TO ANY
FURNACE THAT HAS NOT BEEN CERTIFIED INITIALLY AS COMPLYING WITH CGA
STANDARD CAN1-2.3 OR ITS PRECEDENTS. DO NOT CONNECT TO ANY FURNACE THAT
IS NOT EQUIPPED WITH AN AIR CIRCULATION BLOWER.
DO NOT CONNECT, UNDER ANY CIRCUMSTANCES, TO A CHIMNEY SERVING A GAS
FURNACE OR OTHER GAS APPLIANCE.
AN INTERLOCK LIMIT SWITCH MUST BE INCLUDED IN THE CONTROL CIRCUITRY PRE-
VENTING THE GAS FURNACE FROM OPERATING WHEN THE SYSTEM OUTPUT
PLENUM TEMPERATURE IS ABOVE 150°F. TYPICAL WIRING DIAGRAM FOLLOWS: FIG 5
.
ADD-ON TO OIL FURNACE
The VC120 may be connected to an oil furnace having a rated input of up to 1.25 USGPH. Mini-
mum blower capacity must be at least 900 cfm.. A regular up flow oil furnace may be used and
connected as per fig. 1. The VC120 can be located on either side of the oil furnace. Minimum
interconnect duct size is 10" X 18" with minimum 6" inside radius elbows. The wood furnace re-
quires a chimney approved for solid fuel use. Maintain clearances to all combustibles. Refer to
general instructions portions of this manual also.
If changes are made to the installation of the oil furnace these changes must comply with CSA
Standard B139.
An interlock limit switch must be included in the control circuitry preventing the oil furnace from
operating when the system output plenum temperature is above 150°F. Typical wiring diagram
follows: