Nordyne M1GB 056, Installation Instructions And Owner'S Manuals

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Figure 37. Coil Cavity
Damper
19. OPTIONAL ACCESSORIES
Necessary when the Furnace is Used with Some
Central Air Conditioners
If an air conditioner is installed that does not use the furnace
blower for air distribution and that operates independently of
the furnace, the thermostat system must have an interlock to
prevent the furnace and air conditioner from operating at the
same time. This interlock system usually contains either a
“Heat-Cool” switch which must be turned to the “Heat” or
“Cool” position to activate either heating or cooling operation,
or a positive “OFF” switch on the cooling thermostat.
The furnace must also be equipped with an automatic damper
(See Figures 37 or 38, NORDYNE p/n 901996 for furnaces
without coil cavity, or p/n 901083 with coil cavity) to prevent
cold air from being discharged up around the heat exchanger.
Cold air may cause condensation inside the heat exchanger
which can lead to rust and early failure.
OPTIONAL ADD-ON AIR CONDITIONING
Ask your dealer or contractor about NORDYNE add-on
central air conditioning systems. There is a split-system or
package air conditioner designed for your total comfort needs.
Whether split system or single package, an energy-saving
NORDYNE unit is available that has been designed specifically
for manufactured housing applications and can best handle
your home comfort needs.
Listed and ARI Certified, all models are protected by the
NORDYNE Air Conditioner Limited Warranty.
Single package unit includes cooling coils, compressor, and
vertical discharge fan. This type of unit connects with the
existing home air duct system (an optional close-off damper
is required with the furnace).
Split system unit with vertical discharge for quiet operation
connects with NORDYNE cooling coil furnace (optional coil
cavity required with “A” model furnaces).
Table 10. A/C Blower Selection
Figure 38. Damper without
Coil Cavity
Rc
R
H
W
G
Y
Red
White
Green
Yellow
Red
White
Green
Grey
**
To Cooling Unit
Thermostat
M1G A/C
Ready Furnace
Figure 39. Thermostat Wiring A/C Ready Models
Blower Speed Selection Chart
For use with Blower Kit No. 903412 1/3 Hp 2 Speed
Heating Cooling Speed/ Evap Coil
Furnace Input Speed 024 036
Setting
077, 086, 090 H L H
056, 066, 070 L L H
Blower Speed Selection Chart
For use with Blower Kit No. 903413 1/2 Hp 4 Speed
Heating Cooling Speed/ Evap Coil
Furnace Input Speed 030 &
Setting 036
077, 086, 090 ML L ML MH H
056, 066, 070 L L ML MH H
Blower Speed Selection Chart
For use with Blower Kit No. 903414 3/4 Hp 4 Speed
Heating Cooling Speed/ Evap Coil
Furnace Input Speed 030 & 042 &
Setting 036 048
077, 086, 090 ML L ML MH H
056, 066, 070 L L ML MH H
024 048
024 054
042