12
Flex Fuel Owner’s Manual
March 2011
5: Installation
Furnace and Buffer in
separate buildings
running with a plate
pump.
Furnace and Buffer in
separate buildings
running without a
plate pump.
Pump
Plate
Pump
Diverting Valve
10 Gal
Expansion
Tank
20 Gal
Expansion
Tank
Temp
Probe
Temp
Probe
Furnace
Plate
This document contains information that is property of
Northwest Mfg. No reproductions or duplications of this
Document in whole or part shall be made without written
Authorization from Northwest Mfg.
This is a SUGGESTED layout only. User must determine if
system layout will work for their particular application.
User should check and follow all state and local codes.
Heat Zone Supply
Heat Zone Return
Vent Cap
Vent Cap
Furnace Supply
Pump
Temp Head
1” Copper Line
Diverting
Valve Temp
Probe
Furnace
Drain
Return to
Furnace
Return
from
Storage
Tank
Supply to
Storage Tank
Storage
Tank
The Furnace must be antifreezed to prevent
the outside lines from freezing. Temperature
probe wires should run from the furnace to
the tank so that the tank temperatures can
be read at the furnace. Doing so aides in
determining load size.
Plate zone pump must run continuously or
wired to run simultaneously with the
furnace pump to take heat off the furnace
plate when furnace is heating.
Pump
Diverting Valve
10 Gal
Expansion
Tank
20 Gal
Expansion
Tank
Temp
Probe
Temp
Probe
Furnace
Plate
This document contains information that is property of
Northwest Mfg. No reproductions or duplications of this
Document in whole or part shall be made without written
Authorization from Northwest Mfg.
This is a SUGGESTED layout only. User must determine if
system layout will work for their particular application.
User should check and follow all state and local codes.
Heat Zone Supply
Heat Zone Return
Vent Cap
Vent Cap
Furnace Supply
Pump
Temp Head
1” Copper Line
Diverting
Valve Temp
Probe
Furnace
Drain
Return to
Furnace
Return
from
Storage
Tank
Supply to
Storage Tank
Storage
Tank
The Furnace must be antifreezed to prevent
the outside lines from freezing. Temperature
probe wires should run from the furnace to
the tank so that the tank temperatures can
be read at the furnace. Doing so aides in
determining load size.
Heat zone pump must run continuously to
take heat off the furnace plate when
furnace is heating.