Product data

c. A slide valve test shall energize the increase
and decrease slide valve solenoids to check
for proper operation. The controls shall re-
questmanualoperationconfirmationofproper
solenoid operation before proceeding to the
next test.
d. In addition to a comprehensive automated
Control Test, the controls shall provide a
manualoption that permits selection and test-
ing of individual control components and in-
puts. A thermistor test and transducer test
shall display the actual reading of each trans-
ducer and each thermistor installed on the
chiller on the LCD screen.
e. All sensors shall have quick disconnects to
allow replacement of the sensor without re-
placement of the entire sensor wire. Pressure
transducers shall be capable of field calibra-
tion to ensure accurate readings and to avoid
unnecessary transducer replacement. Trans-
ducers shall be serviceable without the need
for refrigerant charge removal or isolation.
4. Building Control System Interface:
The chiller control system shall have the ability to
interface and communicate directly to the build-
ing control system without the use of additional
field installed hardware and software. If different
building control and chiller suppliers are chosen,
the chiller shall be supplied with a dataport mod-
ule which shall translate the information in the
chiller microprocessor to an ASCII stream of data
which can be read by any manufacturer’s building
management control system.
G. Low Voltage Unit Mounted Starter:
An optional reduced voltage wye-delta or solid-state
startershall be supplied.The compressor motor-starter
shall be factory mounted, wired, and tested prior to
shipment by the chiller manufacturer. Customer elec-
trical connection for compressor motor power shall
be limited to main starter power connection only.
Solid-state starter shall provide stepless compressor
motor accelerating and limit motor inrush current to
100-600% of compressor motor RLA. The starter
shall include 6 silicon control rectifiers (SCR) with
integrally-mounted bypass contactors to provide SCR
bypass once the motor has achieved full voltage and
speed. The starter shall also include automatic accel-
eration kick circuitry which monitors motor current
to sense when the inrush current subsides and auto-
matically ramps voltage up at a faster rate to elimi-
natetheinstability that occurs at the breakaway torque
point.Startershall be UL and CSA approved and shall
include:
• NEMA 1 enclosure with integral fan cooling and
lockable hinged doors
• 1 KVA control/oil heater transformer with branch
circuit breaker
• 5pilot relays for control of chilled water pump, con-
denser water pump, tower fan, customer remote
alarm, shunt trip, and main power disconnect. The
shunt trip shall be energized by the SMM (Starter
Management Module) during unauthorized opera-
tion (such as loss of communication between the
SMM and PSIO [Processor Sensor Input/Output
Module]).
• Microprocessor based overload trip protection
• Phase loss/reversal/imbalance protection
• Ground fault protection
• Three-phase digital ammeter
• Main power disconnect (non-fused type) with shunt
trip.
Solid-state starters also include the following standard
features:
• Normal interrupt capacity main circuit breaker with
shunt trip
• Phase loss/reversal/imbalance protection
• Integral SCR bypass contactors
• Three-phase digital voltmeter
• Three-phase over/under voltage protection
• Digital power factor display
• Digital frequency display
• Event history file to store last 99 events (start,stop
fault)
H. Electrical Requirements:
1. Electrical contractor shall supply and install main
electrical power line, disconnect switches, circuit
breakers,electrical protectiondevices perlocalcode
requirements and as indicated necessary by the
chiller manufacturer.
2. Electricalcontractorshallwirethewaterflowswitches
to the chiller control circuit to ensure that chiller
will not operate until flows are established and
maintained.
3. Electrical contractor shall wire the chilled water
pump, condenser water pump, and tower fan con-
trol circuit to the chiller control circuit.
4. Electrical contractor shall supply and install elec-
trical wiring and devices required to interface the
chiller controls with the building control system, if
applicable.
5. Electrical power shall be supplied to the unit at the
voltage, phase, and frequency listed in the equip-
ment schedule.
I. PipingRequirements — Instrumentation and Safeties:
1. Mechanicalcontractor shall supply and install pres-
sure gages in readily accessible locations in piping
adjacent to the chiller such that they can be easily
read from a standing position on the floor. Gages
shall be Marsh Master or equal with 4
1
⁄ 2 -in. nomi-
nal diameter face. Scale range shall be such that
design values shall be indicated at approximately
mid-scale.
Gages shall be installed in the entering and leav-
ing water lines of the cooler and condenser.
2. Mechanical contractor shall supply and install flow
detection devices in chilled water and condenser
water piping. Switches shall make contact when
flow is established. Flow switches shall be installed
in horizontal runs at least 5 pipe diameters down-
stream from any bend or tee.
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