Version 1.04
March 2011
APEX cbt
Page 24
www.blazeking.com
ADD-ON TO GAS FURNACE
The APEX CBT may be connected to a gas furnace having a max. rated input of 120,000 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 3. A regular up flow gas furnace may be used and connected as per
Fig 3. The APEX CBT can be located on either side of the gas furnace. Minimum interconnect duct size is
12" x 17" with minimum 6" inside radius elbows. Do not, under any circumstances, connect the APEX
CBT 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 PREVENTING
THE GAS FURNACE FROM OPERATING WHEN THE SYSTEM OUTPUT PLENUM TEMPERATURE IS
ABOVE 150°F. TYPICAL WIRING DIAGRAM FOLLOWS: FIG 22.
ADD-ON TO OIL FURNACE
The APEX CBT may be connected to an oil furnace having a rated input of up to 1.2 USGPH. Minimum
blower capacity must be at least 900 cfm. A regular up flow oil furnace may be used and connected as
per fig. 3. The APEX CBT can be located on either side of the oil furnace. Minimum interconnect duct size
is 12" x 17" with minimum 6" inside radius elbows. 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.
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 GAS FURNACE FROM OPERATING WHEN THE SYSTEM OUTPUT PLENUM TEMPERATURE IS
ABOVE 150°F. TYPICAL WIRING DIAGRAM FOLLOWS: FIG 22.
INSTALLATION INSTRUCTIONS - COMBINATON APEX-GAS/OIL
