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DuraSea Condenser Installation, Start-Up & Service Manual
E
VACUATION
If you have confirmed that the system maintains pressure, the line set and evaporator(s) are now ready for evacuation of the
nitrogen (or nitrogen/refrigerant mixture if an electronic leak detector was needed) from the system.
Release nitrogen from system.
Evacuation/Dehydration
Evacuate and dehydrate the connected refrigeration system, excluding the condensing unit, to 200 microns using a two-stage
vacuum pump attached to the service ports on the DuraSea service valves. Close the valve to the vacuum pump. Wait five
minutes, then check the pressure on the thermocouple vacuum gauge.
•
If the pressure is not more than 1000 microns, the system is leak-free and properly evacuated. Proceed to "Preliminary
Refrigerant Charge" on page 15.
•
If the pressure rises, but holds at about 2000 microns, moisture and noncondensibles are still present. Open the valve
to the vacuum pump, and continue evacuation until moisture is removed.
•
If the pressure rises above 5000 microns, a leak is present. Go back to "Pressure Test and Leak Checking" on
page 11. Close the valve to the thermocouple vacuum gauge. Close the valve to the vacuum pump. Shut off the pump.
E
C
LECTRICAL
ONNECTIONS
WARNING
Failure to follow this warning could result in personal injury or death.
Disconnect ALL power before servicing. Do not use gas piping as an electrical ground. Unit cabinet must have an
uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should
occur. Wiring must conform with NEC or CEC and all local electrical codes. Undersized wires could cause poor
equipment performance, equipment damage or fire.
WARNING
To avoid risk of fire or equipment damage, use copper conductors.
NOTE: Check all factory and field electrical connections for tightness. Field-supplied wiring shall conform with the limitations of
63°F (35°C) rise.
F
P
IELD
OWER
When installing units, provide a disconnect switch per NEC or CEC of adequate size.
Disconnect sizing data is provided on the unit informative plate. Locate on unit cabinet or within sight of the unit per national or
local codes. Do not cover unit data plate if mounting the disconnect on the unit cabinet.
All field wiring must comply with NEC and all local codes. Size wire based on MCA (Minimum Circuit Amps) on the unit data
plate. Connect wiring as per diagram located on unit.
Provide a ground-fault and short-circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local codes).
Refer to unit informative data plate for MCB (Maximum Circuit Breaker) device size. Use HACR type circuit breakers or time
delay fuses to assure sufficient time delay to permit the compressor to start.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units,
voltages between phases must be balanced within 2% and the current within 10%. Operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would
invalidate any applicable Dometic warranty.
F
C
IELD
ONTROL
DuraSea condenser uses a 24 VAC control voltage provided by air-handler. See Figure 6, page 14 for typical field control
connections and the unit's label diagram for field-supplied wiring details. Route control wires to the DuraSea unit through the
opening in unit's end panel to the connections 24VAC terminal block in the unit's control box.
Remainder of the system controls connection will vary according to the specific construction details of the indoor section (air
handler or packaged fan coil). Plan for field connections carefully and install control wiring correctly per the project plan.
L-3153
S
UPPLY
W
IRING
Evacuation
13
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