Filters; Dimensions (Upflow Configuration Shown); Side Return Cutout Markings; Cabinet And Duct Dimensions - Johnson Controls MG9S*MP Installation Manual

LEFT SIDE
Combustion Air Inlet
Condensate Drain
(Downflow)
Vent Outlet
28.5"
29.5"
(For Cladded door add appoximately an additional .75")
.56"
23.8"
Combustion
B
Air Inlet
.56"
.56"
20"
SUPPLY END
FIGURE 12: Dimensions (Upflow configuration shown)
Table 3: Cabinet and Duct Dimensions
Nominal
BTUH (kW)
3
Input
CFM (m
60 (17.6) 1200 (34.0)
80 (23.4) 1200 (34.0)
80 (23.4) 1600 (45.3)
100 (29.3) 1600 (45.3)
100 (29.3) 2000 (56.6)
120 (35.1) 2000 (56.6)
SECTION III: FILTERS
FILTER INSTALLATION
All applications require the use of a field installed filter. All filters and
mounting provision must be field supplied.
Filters must be installed external to the furnace cabinet. DO NOT
attempt to install filters inside the furnace.
NOTICE
Single side return above 1800 CFM is approved as long as the filter
velocity does not exceed filter manufacturer's recommendation and
a transition is used to allow use on a 20x25 filter.
Table 4: Recommended Filter Sizes (High Velocity 600 FPM)
CFM Cabinet
(m³/min) Size
1200 (34.0) B
1600 (45.3) B
1600 (45.3) C
2000 (56.6) C
2200 (62.3) C
2000 (56.6) D
1. Air velocity through throwaway type filters may not exceed 300 feet per min-
ute (91.4 m/min). All velocities over this require the use of high velocity fil-
ters.
2. Do not exceed 1800 CFM using a single side return and a 16x25 filter. For
CFM greater than 1800, you may use two side returns or one side and the
bottom or one side return with a transition to allow use of a 20x25 filter.
Johnson Controls Unitary Products
Gas Pipe
Entry
Electrical
Entry
Condensate
Drain
Thermostat
Wiring
3"
Vent
Outlet
C
Cabinet
Size
/min)
A
B 17 1/2
B 17 1/2
C 21
C 21
C 21
D 24 1/2
Side Bottom
(in) (in)
16 x 25 16 x 25
16 x 25 16 x 25
16 x 25 20 x 25
(2) 16 x 25 20 x 25
(2) 16 x 25 20 x 25
(2) 16 x 25 22 x 25
FRONT
Gas Pipe
Entry
Electrical
Entry
33 Condensate
Drain
Thermostat
Wiring
A
Cabinet Dimensions (Inches)
A (cm) B B (cm)
44.4 16 3/8 41.6
44.4 16 3/8 41.6
53.3 19 7/8 50.5
53.3 19 7/8 50.5
53.3 19 7/8 50.5
62.2 23 3/8 59.4
SIDE RETURN - UPFLOW ONLY
Locate the "L" shaped corner locators. These indicate the size of the cut-
out to be made in the furnace side panel. Refer to Figure 13.
FIGURE 13: Side Return Cutout Markings
Install the side filter rack following the instructions provided with that
accessory. If a filter(s) is provided at another location in the return air
system, the ductwork may be directly attached to the furnace side
panel.
Some accessories such as electronic air cleaners and pleated
media may require a larger side opening. Follow the instructions
supplied with that accessory for side opening requirements. Do not
cut the opening larger than the dimensions shown in Figure 12.
420705-UIM-C-0310
RIGHT SIDE
Combustion Air Inlet
Condensate Drain
(Downflow)
Vent Outlet
23"
Optional Return Air
14"
Cutout (Either side)
1.5"
B
24.25"
RETURN END
Approximate
Operating Weights
C C (cm) Lbs
13 1/4 33.7 122
14 3/4 37.5 126
16 1/2 41.9 136
18 1/4 46.4 142
18 1/4 46.4 145
21 3/4 55.2 156
Front of
Furnace
Side of
Furnace
Corner
Markings
1"
9