Fig. 2 — Chilled Water Flow Switch Installation
ater flow s
-
Witc
-
fi rs porn lowar
OUT nozzle. The
.2 black wiresfrom c
attached to, the chilled ;water flow
,
0
CHECK VALVES
Two in-line check valves, one for each refrigerant
circuit, are shipped loose with each 30HS unit for
field installation in discharge piping to remote
condenser(s). Mount each valve
close to the unit,
in a horizontal position, with the bonnet up.
FLOW SWITCHES
For each unit (30HR,HS070-160), a flow switch
is factory provided, but must be field installed. For
installation, attach conduit as shown in Fig. 2.
COOLER
Cooler water inlet and outlet connections are
standard 150 pound ASA flanges (see Fig. 1).
Chilled water temperature controller sensing bulb
is factory installed in the
return
water nozzle for
return
water control.
If
leaving
water control is required, cams in
controller must be reset and the sensing bulb must
be installed in the
leaving
water nozzle.
Otherwise,
do not relocate bulb.
See Carrier System Design Manual, Part 3, piping
Design for chilled water piping details.
Plan piping for minimum number of changes in
elevation. Install manual or automatic vent valve at
high points in line. Maintain system pressure by
using a pressure tank or combination relief and
reducing valve.
Install thermometers in entering and leaving
lines. Provide drain connections at all low points to
permit complete drainage of system. Connect shut-
off valve to drain line before operating unit. Install
shutoff valves near entering and leaving water con-
nections. Use flexible connections on condenser
and cooler piping to reduce vibration transmission.
Insulate piping after leak testing to prevent heat
gain and sweating. Cover insulation with moisture
seal.
ELECTRICAL
All field wiring must comply with local code
requirements. Electrical data for the complete unit
and for individual compressors is in Table 2.
Control circuit voltage is 115 volts for all 60-
Hertz units. Accessory transformer permits control
power to bt taken directly from unit power terminal
block (see Fig. 3). Transformer wiring instructions
are furnished with accessory package.
All units, for all voltages, are wired for across-
the-line start.
FIELD POWER SUPPLY
TO
CIRCUIT
BREAKERS
OPTIONAL 0.75 KVA
TRANSFORMER
—
_c
GROUND
Connection details furnished with accessory transformer
package.
Fig. 3 — Accessory Transformer Connections
START-UP AND SERVICE
INITIAL CHECK
IMPORTANT: Do not at
even momentarily, until the followin
been completed.
1. Electrical power source must agree with unit
nameplate rating.
2.
Check all auxiliary comp'onents such as circu-
lating pumps, air handling equipment, or other
equipment connected to chiller. Consult manu-
facturer's instructions.
3.
Check chilled water safety thermostat. See
Safety Thermostat for adjustment.
4. Backseat (open) compressor suction and dis-
charge shutoff valves. Close valves one turn to
allow some pressure to each test gage (if
installed).
5.
Open liquid line valves.
LI
L2
L3
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