HEIL H4A6 - Start-Up Procedure; Refrigerant Charge Adjustment

INSTALLATION INSTRUCTIONS R-410A, Two-Stage Split System Air Conditioner
421 01 6001 00 9
START-UP PROCEDURE
1. Set indoor thermostat selector switch to OFF.
2. Turn ON all electrical disconnect devices.
3. Unit has a crankcase heater. Energize the heater and
wait 24 hours before proceeding.
4. Set indoor thermostat at desired temperature. Be sure
setpoint is below indoor ambient temperature or
thermostat will not call for cooling.
5. Set indoor thermostat selector switch to COOL.
Operate unit for minimum 15 minutes, then check the
system refrigerant charge.
REFRIGERANT CHARGE
Outdoor units are shipped with a refrigerant charge to
match a specific indoor coil and 15 feet of refrigerant line.
If shorter or longer refrigerant lines or a different indoor
coil are used, the charge will have to be adjusted.
For different line lengths, add or remove charge based on
0.6 ounces charge per foot of difference. For example, a
25 foot line set is 10 feet longer than the specified 15 feet.
Add 0.6 ounces charge for each of the extra 10 feet:
10 x 0.6 = 6.0 ounces additional charge
This outdoor unit is designed for use only with indoor coils
that utilize a TXV refrigerant metering device. With an
indoor TXV, use the subcooling method to make final
charge adjustments:
NOTE: Only use subcooling charging method when
 outdoor ambient temperature is between 70F and 100F
 indoor temperature is between 70 and 80F
 line set is less that 80 feet.
1. Operate unit a minimum of 15 minutes in high
stage before checking charge.
NOTE: Outdoor unit has a 2-speed fan motor.
Motor will operate in low speed when outdoor
ambient temperature is below 82°F. Pull one of the
yellow low voltage wires off the fan control and the
unit will default to high speed fan for servicing.
Reconnect wire after servicing.
2. Measure liquid service valve pressure by attaching
an accurate gauge to service port.
3. Measure liquid line temperature by attaching an
accurate thermistor type sensor or electronic
thermometer to liquid line near outdoor coil.
4. Refer to unit rating plate for required subcooling
temperature.
5. Refer to Figure 10. Find the required liquid line
temperature where the rating plate subcooling
temperature intersects measured liquid service
valve pressure.
6. If the measured liquid line temperature is higher
than the chart number, add refrigerant to lower the
measured temperature.
NOTE: When adding refrigerant, charge in liquid form,
using a flow restricting device, into the suction port.
If the measured liquid line temperature is lower
than the chart number, reclaim refrigerant to raise
the measured temperature.
Tolerance is  3°F.
Figure 10
R-410A Required Liquid Line Temperature (°F)
Measured Liquid
Pressure (psig)
Rating Plate (required)
Subcooling Temperature (°F)
Measured Liquid
Pressure (psig)
Rating Plate (required)
Subcooling Temperature (°F)
6 8 10 12 14 16 6 8 10 12 14 16
251 78 76 74 72 70 68 364 104 102 100 98 96 94
259 80 78 76 74 72 70 374 106 104 102 100 98 96
266 82 80 78 76 74 72 384 108 106 104 102 100 98
274 84 82 80 78 76 74 395 110 108 106 104 102 100
283 86 84 82 80 78 76 406 112 110 108 106 104 102
291 88 86 84 82 80 78 416 114 112 110 108 106 104
299 90 88 86 84 82 80 427 116 114 112 110 108 106
308 92 90 88 86 84 82 439 118 116 114 112 110 108
317 94 92 90 88 86 84 450 120 118 116 114 112 110
326 96 94 92 90 88 86 462 122 120 118 116 114 112
335 98 96 94 92 90 88 474 124 122 120 118 116 114
345 100 98 96 94 92 90