Therma-Stor Products Group FOCUS 135H - Manual (Page 9)

Ultra-Aire 135H Air Purifying Dehumidifier Owners Manual 9
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
D-shaped plate mounted to the supply/exhaust panel
of the UA-135H. The impeller should be attached to
this D-shaped plate. Pull the leads through the black
plastic scroll housing inside, as you remove the
impeller access plate.
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-ELECTRICAL SHOCK HAZARD: Electrical power
must be present to perform some tests. These tests should
be performed by a qualified service person.
7.6 Replacing 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.
7.7 Electric 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 over-ventilating the structure when the unit is
dehumidifying or recirculating the indoor air.
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.
7.8 Condensate Pump Kit
An optional condensate pump kit is available from the factory
for use with the UA-135H. Condensate is automatically
pumped to a remote location when the water level in the
pump's reservoir rises to close the float switch. The pump
also contains a safety float switch. The white leads from this
switch extend from beneath the pump cover. This switch
should be installed in series with the field wire that connects
the blue (#5) lead from the UA-135H to the blue (#5) lead on
the control panel. If the pump fails, this switch opens the
compressor control circuit and stops water production before
the reservoir overflows. The UA-135H will continue to venti-
late or circulate air as normal, but will not dehumidify until
this switch closes.
Figure 2: Condensate pump.
CAUTION