![7.3 Refrigerant Charging](/images/new-backgrounds/49627/4962717x1.webp)
7.3 Refrigerant Charging
If the refrigerant charge is lost due to service or a leak, a new charge must be accurately weighed in. If any of the old charge is left in the system, it must be recovered before weighing in the new charge. Refer to the unit nameplate for the correct charge weight and refrigerant type.
7.4 Impeller Fan Replacement
The motorized impeller fan is a unitary assembly consisting of the motor and impeller fan. If defective, the complete assembly must be replaced.
1.Unplug the power cord
2.Remove the cabinet access panel
3.Disconnect the impeller's blue, black, brown leads, which are attached to the capacitors as well as the green/yellow ground lead.
4.Remove the impeller access plate, which is the
5.Remove the two cable clamps securing the impeller cord to the access plate.
6.Remove the defective impeller from the access plate
7.Reassemble the new impeller fan by reversing the above procedure. Note: Make sure that the new impeller cord is secured tightly to the impeller access plate utilizing the two cable clamps given with the unit. Make sure to reconnect all leads in their correct posi- tions.
7.5 Compressor/Capacitor Replacement
This compressor is equipped with a two terminal external overload and a run capacitor, but no start capacitor or relay.
CAUTION
7.6Replacing a Compressor, Nonburn Out
Remove the refrigerant from the system. Replace the compressor and liquid line filter/drier. Charge the system to 50 PSIG and check for leaks. Remove the charge and weigh in the refrigerant quantity listed on the nameplate. Operate the system to verify performance.
7.7Electric Ventilation Damper
The electric ventilation damper is controlled by the ventilation timer. The damper will open when the ventilation timer is activated to allow fresh air into the structure through the 6” diameter fresh air inlet duct. The electric ventilation damper will remain closed when the ventilation timer is not activated to prevent
The electric ventilation timer operates on 24 Vac from the control circuit. DO NOT connect high voltage to the damper motor or damage to the motor may result. DO NOT force the blade of the damper by hand or damage to the damper motor may result.
The damper opens in one direction only. The damper rotates very slowly, allow sufficient time for the damper to cycle. The damper will take approximately 1 minute to cycle from closed to open or from open to closed.
If the electric ventilation damper fails to operate:
1.Check that the wiring is correct and that voltage is present at the damper motor.
2.Check for any obstruction inside the damper. If the electric ventilation damper fails to operate after performing these checks, it must be replaced.
7.8Condensate Pump Kit
An optional condensate pump kit is available from the factory for use with the
Figure 2: Condensate pump.
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