Allied Lennox 4AC16LT Series Handleiding voor installatie-instructies - Pagina 11

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Liquid Line Set Diameter
3/8 in.
* If line length is greater than 15 ft., add this amount. If line
length is less than 15 ft., remove this amount.
Table 4. Refrigerant Charge Adjustment
IMPORTANT
Mineral oils are not compatible with R410A. If oil must
be added, it must be a polyolester oil.
If the system is void of refrigerant, clean the system using
the procedure described below.
1. Use dry nitrogen to pressurized the system and check
for leaks. Repair leaks, if possible.
2.
Evacuate the system to remove as much of the
moisture as possible.
3.
Use dry nitrogen to break the vacuum.
4.
Evacuate the system again.
5.
Weigh the appropriate amount of R410A refrigerant
(listed on unit nameplate) into the system.
6.
Monitor the system to determine the amount of
moisture remaining in the oil. Use a test kit to verify
that the moisture content is withing the kit's dry color
range. It may be necessary to replace the filter drier
several times to achieve the required dryness level. If
system dryness is not verified, the compressor will fail
in the future.
The outdoor unit should be charged during warm weather.
However, applications arise in which charging must
occur in the colder months. The method of charging is
determined by the unit's refrigerant metering device and
the outdoor ambient temperature.
Measure the liquid line temperature and the outdoor
ambient temperature as outlined below:
1. Connect the manifold gauge set to the service valve
ports as follows (Figure 9 or Figure 10):
• Low pressure gauge to suction line service valve
• High pressure gauge to liquid line service valve
2.
Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of R410A.
3.
If room temperature is below 70°F, set the room
thermostat to call for heat. This will create the
necessary load for properly charging the system in
the cooling cycle.
4.
Use a digital thermometer to record the outdoor
ambient temperature.
5.
When the heating demand has been satisfied, switch
the thermostat to cooling mode with a set point of
506467-01
Oz. per 5 ft. Adjust from 15
ft. Line Set*
3 oz. per 5 ft.
68°F. When pressures have stabilized, use a digital
thermometer to record the liquid and suction line
temperatures.
6.
The outdoor temperature will determine which
charging method to use. Proceed with the appropriate
charging method.
Charge
Using
Temperatures Below 65°F
When the outdoor ambient temperature is below 65°F,
the subcooling method can be used to charge the unit.
It may be necessary to restrict the air flow through the
outdoor coil to achieve pressures in the 200-250 psig
range. These higher pressures are necessary for checking
the charge. Block equal sections of air intake panels and
move obstructions sideways until the liquid pressure is in
the 200-250 psig range (Figure 11).
1. With the manifold gauge hose on the liquid service
port and the unit operating stably, use a digital
thermometer to record the liquid line temperature.
2.
At the same time, record the liquid line pressure
reading.
3.
Use the temperature/pressure chart (Table 7) to
determine the saturation temperature for the liquid
line pressure reading.
4.
Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine
subcooling
Figure 11. Blocking Outdoor Coil
-
=
5.
Compare the subcooling value with those shown in
Table 5. If subcooling is greater than shown, recover
some refrigerant. If subcooling is less than shown,
add some refrigerant.
Charge
Using
Temperatures 65°F or Above
The following procedure is intended as a general guide
and is for use on expansion valve systems only. For
best results, indoor temperature should be 70°F to 80°F.
Monitor system pressures while charging.
Issue 1827
Subcooling
Method
Outdoor coil should be
blocked one side at a time
with cardboard or plastic
sheet until proper testing
pressures are reached
°
Saturation Temperature °F
°
Liquid Line Temperature °F
°
Subcooling Value °F
Approach
Method
-
Outdoor
-
Outdoor
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