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RTAC-SVX01F-EN 49
Installation - Mechanical
Remote Evaporator Option
The RTAC 140-250 ton outdoor unit with the Remote Evaporator option is shipped as two
pieces: the outdoor unit (condensing) and the evaporator. Short suction line connections
are provided with the outdoor condensing unit. The remote evaporator is shipped com
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plete, with factory-mounted electronic expansion valves, water temperature sensors, suc-
tion pressure transducers, liquid level control sensors, all factory wired to a ribbon cable.
Solenoid valves and drain valves are wired to a relay board in the terminal box. The install
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ing contractor is required to provide and install the following:
• 2-wire, twisted shielded communication line between the remote evaporator terminal
box and the Condensing Unit’s control panel
• 115 VAC single phase power supply to the remote evaporator terminal box
• 2 liquid lines
• 2 suction lines
• Suction accumulator as specified
NOTE: A unit ordered as a remote evaporator must also be ordered with either the wide
or low ambient option. The fan inverters are necessary for proper control.
System Configuration and Interconnecting Refrigerant Piping
The system may be configured in any of the four arrangements shown in Figure 26. The
configurations and their associated elevations, along with the total distance between the
remote evaporator and the compressor/condenser section, play a critical role in determin-
ing suction and liquid line sizes. This will also affect field refrigerant and oil charges. Conse-
quently, there are physical limits which must not be violated if the system is to operate as
designed. Please note the following requirements for field installation:
1. The remote evaporator MUST be matched with its respective outdoor condensing unit.
2. The circuit number on the outdoor condensing unit must match the circuit number on
the evaporator, i.e. circuit #1 on the outdoor condensing unit must be connected with
circuit # 1 on the remote evaporator and likewise for circuit #2. RTAC Circuit Capacities
are shown in General Data Tables.
CAUTION
Equipment Damage!
If the circuits are crossed, serious equipment damage may occur.
3. Piping between the evaporator and outdoor unit can not exceed 200 actual feet and/or
an equivalent length of 300 feet.
NOTE: The latter includes the equivalent length of all associated field installed fittings,
valves, accessories and straight lengths of interconnecting piping.
4. Horizontal portions of suction lines must be downward sloping toward the compressor
at least 1/2 inch for each 10 feet run. This promotes the movement of oil in the direc
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tion of gas flow.
5. Suction lines must be insulated.
6. The line sizes defined are to be used only for 40-60 F leaving water temperature and/or
full load ice-making applications.