13
March 2011
Flex Fuel Owner’s Manual
5: Installation
Plumbing the Rear of the Furnace
The images below show how to connect the pump to the back of your Flex fuel furnace using the
installation kit. Please note that the circulation pump and copper lines are not included in the kit.
All plumbing should be done by a qualified plumber. This kit is a 1” kit, a 1.25” kit (020-0010) is available.
To Expansion Tank
Furnace Supply
Pump
Diverting Valve
Diverting
Valve
Temp
Probe
Return to
Furnace
Return from
Storage Tank
Supply to
Storage Tank
Side View
To Expansion Tank
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
Back View
1” Furnace Plumbing Kit (020-0006)
Part No.
Description
0030-195
3/4” F Hose x 1/2”
0020-198
1/2” Ball Valve
0020-224
1” Sw St 90 (3)
0020-227
1” MPT x 1” F Sw (2)
0020-230
1” Sw T
0020-233
1” M Sw x 1” FPT (2)
0020-250
1”x 2” Nipple
0020-258
1 1/2 “ x 1” Reducer (3)
0020-270
1 1/2” Street 90
0020-271
1 1/2” Tee (2)
0020-272
1 1/2” x 1/2” Reducer
0020-366
ISO Pump Flanges
0109-003
1/2” Thermowell
63025
Diverting Valve
57094
Thermostatic Head
Copper P
ipe
Copper Pipe
Copper P
ipe
0020-258
1 1/2 “ x 1” Reducer
0020-258
1 1/2 “ x 1” Reducer
0020-258
1 1/2 “ x 1” Reducer
0020-250
1”x 2” Nipple
0020-366
ISO Pump Flanges
0020-227
1” MPT x 1” F Sw
0020-227
1” MPT x 1” F Sw
63025
Diverting Valve
57094
Thermostatic Head
0020-224
1” Sw St 90
0020-224
1” Sw St 90
0020-224
1” Sw St 90
0020-233
1” M Sw x 1” FPT
0020-233
1” M Sw x 1” FPT
0020-230
1” Sw T
0109-003
1/2” Thermowell
0020-198
1/2” Ball Valve
0020-195
3/4” F Hose x 1/2”
0020-270
1 1/2” Street 90
0020-271
1 1/2” Tee
0020-271
1 1/2” Tee
0020-272
1 1/2” x 1/2”
Reducer
Circulation
Pump
(Not Included)
To furnace hot
water supply
Return from
buffer tank
Supply to
buffer tank
To expansion tank
To furnace cold
water return
To furnace drain
Water
Flow