Electrical Panel & Components - Northwind MAC1211 Engineering, Installation And Service Manual

ELECTRICAL PANELS
Control
Transformer
Condensate
Pump
Transformer
Phase
Monitor
Ground Lug
Power
Terminal
MAC6034/9034 panel
Block
COMPRESSOR CONTACTOR
The compressor contactor supplies power to the compressor and the condenser blower when the thermostat calls for cooling.
It has a 24 volt coil, with the amp rating and number of poles required for the specific model.
TERMINAL BLOCK
The terminal block has 3 terminals that provide a convenient wiring point for the power supply cord internal wiring and pri-
mary grounding.
AUTOMATIC CONDENSER FAN CYCLE SWITCH
Every NorthWind unit is equipped with an automatic condenser fan cycle switch. At 260 PSIG
the condenser blower switches on, automatically. When the load decreases and the pressure in
the liquid line drops to 160 PSIG, the condenser blower turns off, automatically. The switch is
mounted on a schrader access valve, and it can be replaced without recovering the refrigerant.
EVAPORATOR FAN CYCLE SWITCH
All of NorthWind's units are equipped with an evaporator fan cycle switch. Located in the cord storage box (models
MAC1211/1811) and behind the front access door (model MAC60/MAC90, when switched to "cycle" function, the
evaporator blower turns on and off with the compressor. When switched to the "constant" function, the evaporator
blower runs continuously. The constant function may help prevent air stratification as well as clean the air with the
electrostatic filters.
EVAPORATOR FAN SPEED SWITCH
Each NorthWind unit is supplied with a 2-speed evaporator fan switch. Located on the unit's control
panel, the "High" speed selection runs the blower at maximum speed. The "Low" speed selection runs
the blower at 20% less than high speed. The fan switch operates on 24 volts.
ON-OFF SWITCH
The " ON-OFF" switch provides a way to stop all electrical functions on the unit except the
"Power Ready" light. If the unit is plugged in and there is power at the receptacle, the green
light will be lit even if the power switch is in the "OFF" position. This lets the user know
when the receptacle is live.
AIR FILTERS
All NorthWind units include an electrostatic air filter in the evaporator and condenser air handling systems. An electro-
static filter imparts a small static charge to dirt particles passing through it. The media then captures this dirt much
more efficiently than standard foam or aluminum mesh filters. Made of polymer coated polypropylene, the filters can
be washed with mild detergent or backwashed with a garden hose.
Panel
Ground
Cond Fan
Power
Contactor
Terminal
Block
Evap Lo-Speed
Contactor
Evap Hi-Speed
Compressor
Contactor
Contactor
24 volt
transformer
Compressor
Contactor
8
Compressor
Time Delay
Evaporator
Fan Relay
MAC1211/1811 panel
Relay