Trane RAUC-IOM-15, Инструкция по установке и обслуживанию

Страница: 31 / 68

31
Installation (Continued)
loads (OL’s) must be installed as part of the system’s inter-
lock circuit to disable the compressors in the event the cir-
culating pump shuts down or is turned off.
Note: Due to the location of the 5S1 switch within
the circulating pump control circuit, it can be used
as a system ON/OFF switch.
(Outside Air Thermostat 5S57)
A field provided outside air thermostat must be installed
within the interlock circuit to prevent the system from oper-
ating below it’s workable temperature range. Before install-
ing the control wiring, refer to the remote panel illustration
for the electrical access into the panel. Refer to the field
connection diagram for the specific connection points inside
the remote panel. Refer to the “EVP Chiller Controls” sec-
tion for temperature requirements.
Hot Gas Bypass
(All control options)
If hot gas bypass is required, refer to the “Refrigerant Pip-
ing” illustration for supporting equipment tubing connec-
tions. Refer to the specific control option field connection
diagram terminal connections for the hot gas bypass sole-
noid coils.
Controls using 24 VAC
Before installing any connecting wiring, refer to Figure 3-2
for the electrical access locations provided on the unit and
Table 3-6 for AC conductor sizing guidelines, and;
a. Use copper conductors unless otherwise specified.
b. Ensure that the AC control wiring between the
controls and the unit’s termination point does not
exceed three (3) ohms/conductor for the length of
the run.
Note: Resistance in excess of 3 ohms per
conductor may cause component failure due to
insufficient AC voltage supply.
c. Be sure to check all loads and conductors for
grounds, shorts, and miswiring.
d. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
Typical Low voltage components include:
constant volume thermostat (AC & DC wiring);
system control switch wiring (VAV units);
night setback relay wiring (VAV units);
economizer actuator circuit wiring (VAV units);
discharge air sensor wiring (VAV units);
chilled water temperature sensor (EVP units);
jumpers for hot gas bypass operation.
Table 3-6
AC Conductors
Distance from Unit Recommended
to Control Wire Size
000 - 460 feet 18 gauge
461 - 732 feet 16 gauge
733 - 1000 feet 14 gauge
Field Installed Control Wiring
Before installing any connecting wiring, refer to Figure 3-2
for the electrical access locations provided on the unit. In-
stall appropriately sized control wiring for the 115 volt elec-
trical components as required by the application.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote discon-
nects before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be inadvert-
ently energized. Failure to disconnect power before ser-
vicing could result in death or serious injury.
Since the unit-mounted 115V control power transformer
(1T1) is provided on all units, it is not necessary to run a
separate 115 volt control power source to the unit.
Note: 200/230 Volt units are shipped with
transformer 1T1 wired for 200 volt operation. If the
unit is to be operated on a 230 volt power supply,
rewire the transformer as shown on the unit
schematic.
Controls Using 115 VAC
Install appropriately sized 115 volt control wiring for the
electrical components as required by the application.
These components may include:
hot gas bypass solenoid wiring;
supply fan interlock and control circuit;
system control switch wiring (“No Control” units);
step controller wiring (“No Control” units);
chilled water pump interlock wiring (EVP units);
chilled water flow switch wiring (EVP units);
outside air thermostat wiring (EVP units):
liquid line solenoid valve(s).
Supply Fan Interlock
(Control options utilizing an Air Handler)
The normally open evaporator fan interlock auxiliary con-
tacts and the evaporator fan controls; system On/Off switch,
fan starter/contactor, and overloads, must be wired as illus-
trated in the appropriate interlock connection wiring diagram
for the specified application.
EVP Interlocks
(EVP Flow control 6S58)
The flow switch is a binary output device and must be wired
within the interlock circuit. Before installing the control wir-
ing, refer to the remote panel illustration for the electrical
access into the panel. Refer to the field connection diagram
for the specific connection points inside the remote panel.
Provide a proper ground for all control circuitry at the
ground connection screws provided within both the remote
panel and the unit’s control panel.
(EVP Circulating Pump Interlock)
Pump operation and sequence is the responsibility of the in-
staller. During compressor operation, the fluid flow through
the chiller must be maintained. The field provided; ON/OFF
switch, pump starter/contactor, auxiliary contacts and over-