33
Table 11. A/C Blower Selection
a. Replace the oil nozzle with the type nozzle
specifi ed for your furnace.
b. Clean, adjust and replace if necessary the
spark electrodes.
c. Reset the nozzle/drawer assembly to factory
specifi cations.
d. Clean the inside of the furnace heat
exchanger and replace the combustion liner
if necessary.
e. Clean or replace the oil filter element at the oil tank.
f. Adjust the burner for top effi ciency and check
to make sure all fi ttings are leak-tight.
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 ther-
mostat system must have an interlock to prevent
the furnace and air conditioner from operating at
the same time. This interlock system usually con-
tains 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 condensa-
tion 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 de-
signed specifi cally for manufactured housing
applications and can best handle your home
comfort needs.
Listed and ARI Certifi ed, all models are pro-
tected by the NORDYNE Air Conditioner Limited
Warranty.
Platinum series units are self contained package
units with compressor and cooling coils. They
are designed as a drop in system when used
with the AC ready M1.
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).
Blower Speed Selection Chart for M1*B Models and for use with Blower Kit No. 903773 1/4 Hp
3 Speed
Furance Input
Heating
Speed
Setting
Cooling Speed/ Evap Coil
2 Ton
2-1/2 Ton
3 Ton
086, 090
H
L
M
H
066, 070, 077
M
L
M
H
56
L
L
M
H
Blower Speed Selection Chart for M1*C Models and for use with Blower Kit No. 903413 1/2 Hp
4 Speed
Furance Input
Heating
Speed
Setting
Cooling Speed/ Evap Coil
2 Ton
2-1/2 Ton & 3
Ton
3-1/2 Ton
4 Ton
077, 086, 090
ML
L
ML
MH
H
056, 066, 070
L
L
ML
MH
H
Blower Speed Selection Chart for M1*D Models and for use with Blower Kit No. 903414 &
903890 3/4 Hp 4 Speed
Furance Input
Heating
Speed
Setting
Cooling Speed/ Evap Coil
2 Ton
2-1/2 Ton &
3 Ton
3-1/2 Ton &
4 Ton
5 Ton
077, 086, 090
ML
L
ML
MH
H
056, 066, 070
L
L
ML
MH
H
