DuraSea Condenser Installation, Start-Up & Service Manual
Start Unit
L-3153
17
To verify the compressor is rotating in the proper direction:
1.
Connect service gauges to the suction and liquid pressure fittings.
2.
Energize the compressor.
3.
The suction pressure should drop and the liquid pressure should rise, as is normal on any start-up.
C
OMPRESSOR
O
VERLOAD
This overload interrupts power to the compressor when either the current or internal motor winding temperature becomes
excessive, and automatically resets when the internal temperature drops to a safe level. This overload may require 60 minutes
(or longer) to reset. If the internal overload is suspected of being open, disconnect the electrical power to the unit and check the
circuit through the overload with an ohmmeter or continuity tester.
F
INAL
C
HARGE
A
DJUSTMENT
DuraSea R-410A systems use TXVs (Thermal Expansion Valves) to optimize system operation and thus cannot be charged
using the superheat method. System must be charged by Subcooling method.
1.
Operate the unit for a minimum of 15 minutes. Ensure that pressure and temperature readings have stabilized.
2.
Indoor airflow must be within the unit's normal operating range.
3.
Indoor ambient temperature must be in 70°F to 80°F (21°C to 27°C) range.
4.
Mount the temperature sensing device on the liquid (small) line close to the liquid line service valve, and insulate it so
that outdoor ambient temperature does not affect the reading.
5.
Use a thermometer to measure the outdoor ambient temperature. The outdoor temperature will determine the next
step.
Outdoor Temp 65°F (18°C) or Higher
1.
Check subcooling and superheat. Subcooling = Saturated Liquid Temp - Liquid Line Temp. Subcooling should be 6 ±
2°F (3.3 ± 1°C). Superheat = Suction Line Temp - Saturated
Suction Temp. Superheat should be 12 ± 4°F (6.6 ± 2°C).
a.
If subcooling and superheat are low, adjust TXV to 10°F to 12°F (5.5°C to 6.6°C) of superheat, then check
subcooling.
b.
If subcooling is low and superheat is high, add charge to raise subcooling to 6 ± 2°F (3.3 ± 1°C)
then check
superheat.
c.
If subcooling and superheat are high, adjust TXV valve to 10°F to 12°F (5.5°C to 6.6°C) of superheat, then
check subcooling.
d.
If subcooling is high and superheat is low, adjust TVX valve to 10°F to 12°F (5.5°C to 6.6°C) of superheat and
remove charge to lower the subcooling to 6 ± 2°F (3.3 ± 1°C)
5.
Disconnect manifold set, installation is complete.
NOTE:
Do not adjust charge based on suction pressure unless there is a gross undercharge.
CAUTION
Unit Damage Hazard: Failure to follow this caution may result in equipment damage.
Never charge liquid into the low-pressure side of system. Do not overcharge. During charging or removal of
refrigerant, be sure indoor fan system is operating. Ensure outdoor fan motors are running.
Summary of Contents for DuraSea DCA120D
Page 27: ...NOTES ...
