Wiring Diagrams

30HK040-060
30HL050, 060, 30HW018-040
Packaged Hermetic Reciprocating Liquid Chillers
50/60 Hz
Wiring Diagrams
DIAGRAM INDEX
UNIT 30
VOLTAGE
DIAGRAM TYPE
FIGURE NO.
LABEL DIAGRAM NO.
HK, HL
HK, HL
HK, HL
HK, HL
HW
HW
HW
HW
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
Component Arrangement
Power Schematic
Control Schematic
Field Wiring Diagram
Component Arrangement
Power Schematic
Control Schematic
Field Wiring Diagram
1
2
3
4
5
6
7
8
30HK510003
30HK510003
30HK510002
30HK510064
30HW500231
30HW500221
30HW500221
30HW500168
SERIAL NO.
EFFECTIVE
3398F
3398F
3398F
3398F
2896F
2896F
2896F
2896F
SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can be
hazardous due to system pressures, electrical components, and
equipment location.
Only trained, qualified installers and service mechanics
should install, start up, and service this equipment.
Untrained personnel can perform basic maintenance functions such as cleaning coils. All other operations should be performed by trained personnel.
When working on the equipment, observe precautions in the
literature and on tags, stickers, and labels attached to the equipment. Follow all safety codes. Wear safety glasses and work
gloves. Use care in handling, rigging, and setting bulky equipment.
ELECTRIC SHOCK HAZARD
Open all remote disconnects before servicing
this equipment.
SAFETY FEATURES
1. On resumption of power after a power failure, the unit
will recycle automatically, bringing on the compressor
after a period of 6 seconds to 5 minutes has elapsed.
2. To reset the compressor overtemperature protection,
high-pressure switch circuit, low-pressure switch circuit, and oil pressure switch (if equipped), turn the
ON-OFF switch to OFF, then back to ON position.
IMPORTANT: If a compressor shuts down because
the overtemperature protector opens, check for refrigerant leaks, proper unit voltage, and sufficient fluid
flow before resetting.
3. The specially calibrated circuit breakers are designed
and selected for hermetic refrigeration-duty compressor motors.
Book 2
Tab 5c
Use only designated overload protection.
SEQUENCE OF OPERATION
The 30H units have a multiple-step temperature controller,
factory set to maintain capacity control through leaving chilled
fluid temperature. The controller has 4 capacity steps. All
30HK, HL units have 4 capacity steps as standard. The
30HW018 and 028-040 units have 3 steps as standard, with a
fourth step available as a factory-installed option. The
30HW025 units have 2 steps of capacity as standard with a
third step available as a factory-installed option. All units have
electric solenoid unloaders.
At initial start-up, assume that all safety devices are satisfied
and there is a call for cooling.
30HK, HL Units — Close the compressor circuit breaker
and turn the ON-OFF switch to ON position.
In approximately 5 minutes, the lead compressor starts and
the unloaders are energized (compressor unloads when compressor unloader solenoid is energized). On 30HL units, the
liquid line solenoid valve will remain closed for the first 10
seconds of compressor operation. The low-pressure and oil
pressure switches are bypassed for 2 minutes. At the end of the
2-minute bypass period, the low-pressure and oil pressure
switches are active in the control circuit.
Approximately 30 seconds (high setting) or 3 minutes (low
setting) later, depending on the sample rate setting, the lag
compressor starts and the unloaders are energized (compressor
unloads when compressor unloader solenoid is energized). On
30HL units, the liquid line solenoid valve will remain closed
for the first 10 seconds of compressor operation. The lowpressure and oil-pressure switches are bypassed for 2 minutes.
At the end of the 2-minute bypass period, the low-pressure and
oil-pressure switches are active in the control circuit.
Approximately 30 seconds (high setting) or 3 minutes (low
setting later, depending on the sample rate setting, the lead
compressor is loaded (unloader solenoids deenergized).
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 903
Catalog No. 533-015
Printed in U.S.A.
Form 30H-2W
Pg 1
7-99
Replaces:30H-1W
When the load is satisfied and the leaving fluid temperature
falls below the set point, the last stage activated is dropped immediately. If the leaving fluid temperature still remains below
the set point, then the control drops an additional stage every
30 (high setting) or 180 (low setting) seconds, depending on
the sample rate setting.
Once the compressor is shut-off, the control system prevents the compressor from restarting within 5 minutes of when
it was last shut down. Once this period has elapsed and the
leaving fluid temperature rises above the set point, the compressor will start within 5 seconds.
If the unit is equipped with field-installed hot gas bypass,
the hot gas bypass valve opens only when stage 1 is active.
If the unit trips out on high pressure, low pressure, ground
current (accessory), or low oil pressure, the control module
locks the unit off and must be manually reset (turn the ONOFF switch to OFF and then back to ON position). If the unit
trips out on low fluid temperature, chilled fluid flow switch or
chilled fluid pump switch, it restarts automatically when the
condition is corrected.
30HW Units — Close the compressor circuit breaker and
move ON-OFF switch to ON position. The switch should light
up. In approximately 3 seconds, the compressor starts unloaded. For 2 minutes the low-pressure switch is bypassed and the
unloaders are energized (compressor unloads when compressor
unloader solenoid is energized). At end of 2-minute bypass period, the low-pressure switch activates in the control circuit and
the temperature controller regulates the capacity steps based on
leaving cooler fluid temperature, and set point and deadband
settings on the temperature controller.
If system load drops to the point where unit is fully unloaded and the fluid temperature is below the lower deadband limit,
the compressor shuts off and is not able to restart until the 5minute anti-short cycle has expired. If during normal operation,
the fluid temperature rises above the upper deadband limit, the
temperature controller adds a step of capacity (assuming a step
is left to be added).
On condenserless units (30HWA), or on fluid-cooled units
(30HWB, C, and S) equipped with the accessory oil safety
switch, the control module provides a 2-minute bypass of the
oil safety switch.
If the unit is equipped with the hot gas bypass option, the
hot gas bypass valve closes before unloaders are deactivated
If the unit trips out on high or low pressure, ground current
(accessory), or low oil pressure, the control module locks the
unit off and must be manually reset (by turning the ON-OFF
switch to OFF, then back to ON position). If the unit trips out
on low fluid temperature, chilled fluid flow switch, or chilled
fluid pump switch, it restarts automatically when the condition
is corrected.
LEGEND
A
C
CB
CH
CM
COM
COMP
COTP
CR
CMR
CWFS
CWP
D
DLS
EQUIP
GCS
GND
HGB
HGS
HPS
ILC
J
L
LLSV
LPS
N
— Alarm
— Contactor, Compressor
— Circuit Breaker
— Crankcase Heater
— Control Module
— Common
— Compressor
— Compressor Overtemperature Protection
— Control Relay
— Control Module Relay
— Chilled Water (Fluid) Flow Switch
— Chilled Water (Fluid) Pump Interlock
— Discharge
— Demand Limit Switch
— Equipment
— Ground Current Sensor
— Ground
— Hot Gas Bypass
— Hot Gas Solenoid
— High Pressure Switch
— Condenser Interlock
— Jumper
— Light
— Liquid Line Solenoid Valve
— Low-Pressure Switch
— Neutral
NC
— Normally Closed
NEUT — Neutral Wire Lug
NO
— Normally Open
OPS
— Oil-Pressure Switch
PL
— Plug
R
— Relay
SEC
— Seconds
SW
— Switch
T
— Thermistor
TB
— Terminal Block
TC
— Temperature Control
TDR
— Time Delay Relay
THERM — Thermistor
TOR
— Toroid
TRAN — Transformer
TSW
— Thermistor Switch
U
— Unloader
— Terminal Block
— Terminal (unmarked)
— Terminal (marked)
— Splice
— Factory Wiring
— Field Wiring
— Accessory or Option Wiring
— To indicate Common Potential Only,
Not to Represent Wiring
NOTES
6. All field interlock contacts must have a minimum
rating of 2 amps at 24 vac sealed. See field interlock
wiring.
7. Compressors are thermally protected. Three-phase
motors are protected against primary single-phasing
conditions.
8. On 30HW units, connect yellow wire to (H2) for 208,
346, and 575 v; to (H3) for 230, 380, and 400 v; to
(H4) for 460 v.
9. When installing GSC’s CWPS, CWP, DLS or remote
ON/OFF switch factory jumpers must be removed,
refer to unit label diagram for more detail.
1. Factory wiring is in accordance with the National
Electrical Code (U.S.A.). Any field modifications or
additions must be in compliance with all applicable
codes.
2. Field-installed power wires must be rated 75 C minimum.
3. All circuit breaker must-trip amps are equal to or less
than 156% rated load amps.
4. Schematic (Fig. 3 and 7 shows controller in fully
loaded position. Compressor unloads when compressor unloader solenoid is energized.
5. Oil pressure safety switch is standard on 30HL and
30HWA and 30HW brine duty units only.
2
3
Fig. 1 — Component Arrangement; 30HK,HL Units
4
Fig. 2 — Power Schematic; 30HK,HL
Fig. 3 — Control Schematic; 30HK,HL Units
5
COOLER LEAVING WATER
Fig. 3 — Control Schematic; 30HK,HL Units (cont)
6
FIELD POWER WIRING, 50 Hz UNITS
w/ACCESSORY TRANSFORMER
FIELD CONTROL WIRING, 50 Hz UNITS
FIELD ACCESSORY WIRING
Fig. 4 — Field Wiring Diagram; 30HK,HL Units
7
Fig. 5 — Component Arrangement; 30HW Units
8
Fig. 6 — Power Schematic; 30HW Units
9
Fig. 7 — Control Schematic; 30HW Units
10
11
Fig. 8 — Control Schematic; 30HW Units
Copyright 1999 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 903
Catalog No. 533-015
Printed in U.S.A.
Form 30H-2W
Pg 12
7-99
Replaces:30H-1W
Book 2
Tab 5c