12
STEP 13
—
Check Charge
UNIT CHARGE
Factory charge and charging method are shown on unit
information plate. Charge Puron refrigerant units with cylinder in
inverted position and a commercial--type metering device in
manifold hose. Charge refrigerant into suction line.
NOTE
: If subcooling charging conditions are not favorable,
charge must be weighed in accordance with unit rating plate,
±
0.6
oz/ft. of 3/8--in. liquid line above or below 15 ft., respectively.
Favorable conditions fall within the ranges given on the charging
chart on the outdoor unit plate.
EXAMPLE
:
To calculate additional charge required for a 25--ft. line set:
25 ft. -- 15 ft. = 10 ft. X 0.6 oz/ft. = 6 oz. of additional charge.
COOLING ONLY PROCEDURE
This system requires charging by the subcooling method.
1. Operate unit a minimum of 10 minutes
in high stage
before checking charge. On 24ANA7 models, charging in
low stage may cause compressor chattering and possible
damage to the compressor.
2. Measure liquid service valve pressure by attaching an
accurate gage to service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type or electronic thermometer to liquid line
near outdoor coil.
4. Refer to unit rating plate for required subcooling
temperature.
Subcooling amount is for high stage
operation.
5. Refer to Table 4. Find the point where required subcooling
temperature intersects measured liquid service valve
pressure.
6. To obtain required subcooling temperature at a specific
liquid line pressure, add refrigerant if liquid line
temperature is higher than indicated or reclaim refrigerant
if temperature is lower. Allow a tolerance of
±
3
_
F.
TROUBLESHOOTING
SYSTEMS COMMUNICATION FAILURE
If communication with the Infinity Control is lost with the user
interface, the control will flash the appropriate fault code. (See
Table 5) Check the wiring to the User Interface, indoor and
outdoor units.
MODEL PLUG
The control board must have a valid model plug to operate. If a
valid model plug is not detected, it will not operate and the
control will flash the appropriate fault code, shown in table 5.
PRESSURE SWITCH PROTECTION
The outdoor unit is equipped with high-- and low--pressure
switches. If the control senses the opening of a high or low
pressure switch, it will respond as follows:
1. De--energize the appropriate compressor contactor,
2. Keep the outdoor fan operating for 15 minutes,
3. Display the appropriate fault code. (See Table 5)
4. After a 15 minute delay, if there is still a call for cooling
and the LPS or HPS is reset, the appropriate compressor
contactor is energized.
5. If LPS or HPS has not closed after a 15 minute delay, the
outdoor fan is turned off. If the open switch closes anytime
after the 15--minute delay, then resume operation with a
call for cooling.
6. If LPS or HPS trips 3 consecutive cycles, the unit
operation is locked out for 4 hours.
7. In the event of a high pressure switch trip or high pressure
lockout, check the refrigerant charge outdoor fan operation
and outdoor coil for airflow restrictions.
8. In the event of a low pressure switch trip or low pressure
lockout, check the refrigerant charge and indoor airflow.
CONTROL FAULT
If the outdoor unit control board has failed, the control will flash
the appropriate fault code. (See Table 5) The control board
should be replaced.
BROWN OUT PROTECTION
If the line voltage is less than 187v for at least 4 seconds, the
appropriate compressor contactor and fan relay are de--energized.
Compressor and fan operation are not allowed until voltage is a
minimum of 190v. The control will flash the appropriate fault
code. (See Table 5)
230V LINE (POWER DISCONNECT) DETECTION
If there is no 230v at the compressor contactor(s) when the indoor
unit is powered and cooling demand exists, the appropriate error
code is displayed. (See Table 5) Verify that the disconnect is
closed and 230v wiring is connected to the unit.
COMPRESSOR VOLTAGE SENSING
The control board input terminals labeled VS, VR and L2 on
24ANA7 models and VS and L2 on 24ANA1 models (see Fig.
10) are used to detect compressor voltage status, and alert the user
of potential problems. The control continuously monitors the
high voltage on the run capacitor of the compressor motor.
Voltage should be present any time the compressor contactor is
energized, and voltage should not be present when the contactor
is de--energized.
CONTACTOR SHORTED DETECTION
If there is compressor voltage sensed when there is no demand for
compressor operation, the contactor may be stuck closed or there
is a wiring error. The control will flash the appropriate fault code.
24AN
A