AUXILIARY LIMIT SWITCH
C. Start-Up Cooling Section and Make Adjustments
CAUTION: Complete the required procedures given in the
Do not jumper any safety devices when operating the unit.
Do not operate the compressor when the outdoor tem- perature is below 40° F (unless accessory
Do not
CHECKING COOLING CONTROL
1.Place room thermostat SYSTEM switch in OFF position. Observe that blower motor starts when FAN switch is placed in ON position and shuts down when FAN switch is placed in AUTO position.
2.Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set cooling control below room tem- perature. Observe that compressor, condenser fan, and evaporator blower motors start. Observe that cooling cycle shuts down when control setting is satisfied. The evaporator fan will continue to run for 30 seconds.
3.When using an
IMPORTANT:
CHECKING AND ADJUSTING REFRIGERANT
NOTE: Adjustment of the refrigerant charge is not required unless the unit is suspected of not having the proper
A refrigerant charging chart label is attached to the outside of the compressor access door. The chart includes the required suction line temperature at given suction line pressures and outdoor ambients..
An accurate superheat, thermocouple- or
IMPORTANT: When evaluating the refrigerant charge, an indi- cated adjustment to the specified factory charge must always be very minimal. If a substantial adjustment is indicated, an abnormal condition exists somewhere in the cooling system, such as insuf- ficient airflow across either coil or both coils.
REFRIGERANT
Unit panels must be in place when unit is operating during charging procedures.
NO CHARGE: Use standard evacuating techniques. After evacu- ating system, weigh in the specified amount of refrigerant (refer to system data plate).
LOW CHARGE COOLING: Measure outdoor ambient using Cooling Charging Charts (Figs.
TO USE COOLING CHARGING CHARTS: Take the outdoor ambient temperature and read the suction pressure gauge. Refer to the chart to determine what the suction temperature should be.
NOTE: If the problem causing the inaccurate readings is a refrigerant leak, refer to Check for Refrigerant Leaks section in this document.
D. Indoor Airflow and Airflow Adjustments
CAUTION: For cooling operation, the recommended airflow is 350 to 450 cfm for each 12,000 Btuh of rated cooling capacity. For heating operation, the airflow must produce a temperature rise that falls within the range stamped on the unit rating plate.
Table 7 shows the temperature rise at various
NOTE: Be sure that all supply- and
WARNING: Shut off gas supply then disconnect elec- trical power to the unit before changing blower speed. Electrical shock or explosion could cause serious injury or death.
Airflow can be changed by changing the lead connections of the blower motor.
All 583B units are factory wired for low speed and may need to be wired for medium or high speed in the field.
For
black = high speed | black = high speed |
blue = medium speed | |
red = low speed | red = low speed |
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To change the speed of the blower motor (BM), remove the fan motor speed leg lead from the blower relay (BR). This wire is attached to terminal BM for