Electrical Wiring; Unit Power Supply - Trane CGA-SVX01A-EN Installation, Operation And Maintenance Manual

CAUTION: If using an acidic commercial
flushing solution, construct a temporary
bypass around the unit to prevent
damage to the evaporator.
CAUTION: To avoid possible equipment
damage, do not use untreated or
improperly treated water.
For unit's water connection sizes and
locations, please refer to Figure 2.
CAUTION: To prevent unit damage, do
not reverse system piping connections to
the unit; water entering the unit must
enter at the designated "Water In" and
leaving water must exit the unit through
the designated "Water Out" connection.
Figure 4 illustrates typical unit piping
components. Components and layout will
vary slightly depending upon the locations
of the connections and water source.
Figure 5 gives a schematic of a typical
system application for this unit.
Provide vents at high points in the piping to
bleed air from the chilled water system.
Install pressures gage(s) to monitor entering
and leaving chilled water pressure.
CAUTION: To prevent damage to the
waterside components of unit, do not
allow evaporator pressure to exceed 100
psig (i.e. maximum working pressure).
Use an expansion tank to isolate this
pressure if water pressure exceeds this
value.
© American Standard Inc. 2001

ELECTRICAL WIRING

WARNING: To prevent injury or death,
disconnect electrical power source
before completing wiring connections to
the unit.
CAUTION: Use only copper conductors
for terminal connections to avoid
corrosion or over heating.
Figure 2 shows the location of the unit
electrical access openings. Table 2 provides
minimum circuit ampacities, recommended
fuse sizes, and motor electrical data.

UNIT POWER SUPPLY

Refer to the unit wiring schematic fixed to
the control panel cover. The installer must
provide a power supply of proper voltage
and a fused disconnect switch to the unit.
Run properly sized power wirings through the
electrical access opening on the side of the
unit, and connect it to the Voltage Terminal
Block (1TB1) in the unit control panel. Install
a fused disconnect switch as required by
local codes. Provide proper equipment
grounds for the ground connections in the
unit control panel and at the fused disconnect
switch.
Refer to wiring diagrams from Page 13 to
Page 16 for reference of a typical unit installa-
tion. For actual wiring diagram, refer to the
one fixed to the control panel cover.
8
FLOW SWITCH INTERLOCK
To avoid possible evaporator freeze-up
resulting from reduced water flow, install a
flow switch ( or other flow sensing device) in
the evaporator outlet water line. This sensing
device must be adjusted to stop compressor
operation if water flow to the evaporator
drops below 70% of the system design full-
flow rate.
The installer must provide interconnecting
wiring between the unit control panel and the
water flow sensing switch in the evaporator
water line.
CGA-SVX01A-EN