506325-01
Issue 1734
Page 5 of 15
Figure 3. Positioning Divider Panel
4. Use the two installation brackets to secure the unit to
the wall sleeve (see Figure 4). The units are shipped
with the brackets placed in the return air compartment.
Hook each bracket into the front edge of the wall sleeve
side. Position the bracket so it can be bent around the
front corner of the unit. Remove one of the two screws
in that position on the unit. Line up one of the holes in
the installation bracket with the screw hole and attach
the bracket to the unit with that screw. Make sure to
fasten tight enough that the seal is maintained. Trim
off excess bracket if applicable.
5.
Inspect the fit up of the unit to the wall sleeve. Verify
that the gaskets of the wall sleeve make a complete
seal to the unit paying particular attention to top and
bottom corners of unit to sleeve seal. Caulk if needed.
Ductwork
Ductwork should be designed and sized according to the
methods in Manual Q of the Air Conditioning Contractors
of America (ACCA).
Check unit air supply outlet for debris before making
ductwork connections.
It is recommended that supply and return duct connections
at the unit be made with flexible joints. If flexible ducts are
used, a 6” sheet metal starter collar is required.
The supply and return air duct systems should be designed
for the CFM and static requirements of the job (see Table
2).
They should not be sized to match the dimensions
of the duct connections on the unit.
The return duct
should be sealed to the unit casing (including the casing
slots for aiding filter access) and terminate outside the
space containing the unit.
Table 2. Blower Performance
Model
Blower
Speed
External Static Pressure (in. w.c. w/filter)
0.1
0.2
0.3
0.4
0.5
MHP4-09-12
MHP4-09-18
MHP4-09-24
Low
450
440
425
400
370
Medium/Low
700
690
680
650
600
Medium/High
810
800
790
770
730
High
940
920
875
850
810
MHP4-9-30
Low
620
600
580
560
535
Medium/Low
840
820
785
750
700
Medium/High
975
940
870
825
760
High
1075
1000
930
880
800
MHP4-9-36
Low
750
720
680
650
620
Medium/Low
1000
980
950
920
880
Medium/High
1100
1080
1050
1020
980
High
1270
1230
1200
1170
1130
MHP4-10-18
MHP-10-24
Low
450
440
425
400
370
Medium/Low
700
690
680
650
600
Medium/High
810
800
790
770
730
High
940
920
875
850
810
MHP4-10-30
Low
630
620
610
580
550
Medium/Low
900
890
850
800
750
Medium/High
1070
1030
1000
920
840
High
1220
1150
1100
1030
920
