IM 354 / Page 3
b. Conditioner with Subbase — Where the optional
subbase is used, the rectangular knockout in the right
front bottom of the wall sleeve is removed to allow the
subbase junction box to be mounted directly beneath
the wall sleeve (see Figure 3).
2. 265 Volt Models — Permanently wired to the subbase
junction box receptacle. A short interconnecting cord is
furnished from the chassis to reach this receptacle to
preserve the ease of quick chassis changeout. The condi-
tioner is marked with the minimum circuit ampacity and
maximum fuse size. The subbase and receptacle are
standard factory supplied equipment on these models.
Incremental air conditioners can be installed in various ways.
This instruction is based on the use of an optional subbase,
an optional louver frame and an optional condensate drain.
The following is a recommended installation procedure:
Optional Condensate Drain
If it is used, provisions should be made in the stub-up area for
the condensate connection (see Figure 4). Since the MQT
Heat Pump has a reverse cycle heating feature, it generates
condensate during the heating season which may not be
completely removed by the normal condensate disposal
system. A condensate drain opening is therefore provided at
the left bottom front of the heating/cooling chassis; it is
shipped from the factory with a rubber plug inserted. An
optional condensate drain kit is available, and it is recom-
mended that it be used to connect the chassis to condensate
drain (by others). A knockout is provided in the basepan of
the wall sleeve for this purpose.
Optional Subbase
Whenever a subbase is used, it must be installed prior to the
room/cabinet wall sleeve.
The subbase, provided in four pieces, is adjustable from
4
3
⁄
8
" to 15
5
⁄
8
" (111 to 397mm) in depth to accommodate
various projections of the conditioner into the room. The
standard subbase height is 4" (102mm) with adjustable
leveling bolts to 4
1
⁄
2
" (114mm). In all cases, the subbase
provides a 5
1
⁄
2
" (140mm) toe space inset from the front edge
of the conditioner. Thus, for applications where the minimum
9
3
⁄
4
" (248mm) conditioner projection into the room is utilized,
only the 4
3
⁄
8
" (111mm) deep front section of the subbase is
required. The adjustable side extension pieces should be
discarded. The adjustable “L” shaped extension pieces are
used when the conditioner projection into the room is greater
that 9
3
⁄
4
" (248mm). The scoring at two-inch intervals on the
extension pieces can be broken at the desired depth. The
extensions are secured with two screws on each side to the
front section on the subbase. In all cases the back of the
subbase remains open and is butted against the wall (see
Figures 4 and 5).
Optional Subbase & Codensate Drain Installation
Figure 4.
Figure 3. Conditioner — with subbase
*Note: These are actual unit dimensions. The rough
opening through the wall should be at least
1
⁄
4
" (6mm)
larger without louver frame, or at least
5
⁄
8
" (16mm)
larger when louver frame is used.
Unit Outside
Dimensions
Optional Subbase
Optional Subbase Front
Access Cover
Opening for
Condensate Drain
Receptacle
Leveling Bolt
Screw
Receptacle
Cover
Centerline of Wall
Opening/Subbase
Screw
16
3
⁄
8
"
(416mm)*
Equipment
Ground Wire
Wall O
pening
Electrical
Stub-up Area
44
7
⁄
8
" (1140mm)*