OM-MP80 E V1.15
January 29, 2015
Page 18
MP80
ADD-ON TO GAS FURNACE
Th
e MP80 may be connected to a gas furnace having a maximum rated input of 120,000 BTU. Minimum
blower capacity must be at least 900 cfm. A counter fl ow gas furnace may be used with an interconnect duct as
indicated in Fig.3 (see “INSTALLATION INSTRUCTIONS cont.” on page 11. A regular up fl ow gas furnace
may be used and connected as per Fig.3 (see “INSTALLATION INSTRUCTIONS cont.” on page 11). Th
e
MP80 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 MP80 fl ue to a chimney
that also vents the gas furnace. Th
e 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. THE INSTALLATION OF THE GAS FURNACE SHALL
COMPLY WITH THE APPLICABLE REQUIREMENTS OF CSA B365, AND IF CHANGES ARE
MADE TO THE INSTALLATION OF THE GAS FURNACE, INCLUDING CLEARANCES FOR
SERVICING, THESE SHALL COMPLY WITH CSA B149.1.
ADD-ON TO OIL FURNACE
Th
e MP80 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 fl ow oil furnace may be used and connected as per Fig.3 (see
“INSTALLATION INSTRUCTIONS cont.” on page 11). Th
e MP80 can be located on either side of the oil
furnace. Minimum interconnect duct size is 12” x 17”. Th
e wood furnace requires a chimney approved for solid
fuel use. Maintain clearances to all combustibles. Refer to general instructions portions of this manual also.
NOTE: Careful attention must be used when adding an MP-80 add-on furnace to an existing
oil furnace if the existing oil furnace is using an AHST 1700 deg stainless steel chimney as
it can not be used by the wood furnace, you must either upgrade the existing chimney to a
S-629 compliant 2100 deg chimney or add a separate chimney for the wood furnace.
If changes are made to the installation of the oil furnace these changes must comply with CSA Standard B139.
WHEN INSTALLING AN MP80 TO AN EXISTING GAS, OIL, OR ELECTRIC FURNACE
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:
(See Fig. 22 on next page.)
INSTALLATION INSTRUCTIONS cont.
