Product Overview

31
103859-12 - 8/19
MPO-IQ
Installation & Service Manual
Boiler Model No.
Boiler Flue Outlet
Collar OD (Inch)
Vent Hood
Inner Pipe
Diameter (Inch)
Flex Oil Vent Pipe
Inner Pipe Diameter
(Inch)
* Flue Outlet Collar to
Vent Pipe Adapter (Inch)
MPO-IQ147B
6 5 6 to 5
MPO-IQ189B
MPO-IQ231B 7 6 7 to 6
NOTE: * The model specific Direct Vent (FDVS) Kit Cartons contain adapters (reducers) (see Table 6) to connect boiler flue outlet
collar to vent pipe.
Table 6: Flex Vent / Vent Termination Pipe Diameters
FLUE OUTLET COLLAR
(See Figure 21)
1. Apply a bead of supplied high temperature
sealant to boiler flue outlet collar
approximately 1" from collar end.
2. Remove any oil and grease from inside
of supplied Appliance (Boiler Flue
Outlet) Adapter, and, apply a bead of
high temperature sealant to inside of the
adapter, ½" from end.
3. With twisting motion, assemble the
appliance adapter onto boiler flue outlet
collar.
4. Using a mallet and a block of wood,
carefully tap the adapter onto the outlet
collar. Insure no damage is done to the
adapter and the flue outlet collar.
5. Assemble supplied adapter clamp halves
with 5/16-18 bolts and square nuts; install
the adapter clamp onto the appliance
adapter and tighten securely.
6. If required, install anchoring screws
(installer provided) thru four holes in the
clamp into the flue outlet collar.
7. Apply sealant around the adapter end
Figure 21: Appliance Adapter Installation
mated to the flue outlet collar.
8. Install supplied 3/8” sampling port plug screw hand
tight into the adapter sampling port.
9. After initial boiler start-up and burner testing/
adjustment are completed, apply high temperature
sealant under the head of sampling port plug screw,
and, install the screw in the sampling port tightening
securely.
F. CONNECTING FLEX OIL VENT PIPE TO APPLIANCE
Figure 22: Vent Pipe Assembly to Vent Termination
Inner Pipe and Appliance Adapter
5 Direct Venting / Air Intake Piping (continued)