Carrier 30HS User Manual

Number One AirConditbning Maker

n of Carrier Corporation

Syracuse New York

Wiring Diagrams

Reciprocating Liquid Chillers

60-Hertz

These diagrams apply to 30HR,HS070—120 Model A units starting with Serial No. FI 55985 and ending with Serial No. G448588.

INDEX

30HR,HS

070 iJ»ru tm

UNIT

30HR,HS

070 thru

120

070, 080, 090

100,

no,

120

FIGURE

NUMBER

DESCRIPTION

Wi ri rig For

Part-Winding Start Suggested Field

Wiring Interlocks

’ ~T_ocdtTons o?

Control Components

Power Schernatic Control CTrcu i t

{Simplified Schematic)

CornfroTTr i rcuit (Simplified Schematic)

Power Schematic

'Locations of

Control Components

GENERAL NOTES

1. Factory wiring is in accordance with the National Electrical Code. Any field modifica tions or additions must be in compliance with all applicable codes. Field-installed power wires must be rated 75 C minimum.

2. Control circuit is 115-1-60, with 10-amp circuit breaker.

3. Oil pressure safety switches are standard on

30HS units only. Jumpers between terminals] 1 |

and

and between and are supplied on

30HR units.

4. Manual transfer switch provides the following

starting sequences:

Three-compressor units — position 1 (terminal

A), 3-2-1; position 2 (terminal B), 1-2-3. Four-compressor units ~ position 1 (terminal

A), 1-4-3-2; position 2 (terminal B), 3-2-1-4.

Stop unit before changing transfer switch position.

VOLTS

All

208,230,

460,575

208,230,

460,575

UNIT LABEL DIAGRAM

30HR

All

080-1214 080-1224

100-1584 100-1594

Same As

Below

5. All field-supplied auxiliary contacts must have a minimum rating of 1250-va inrush and 430-va sealed plus capacity required for field-installed

equipment between terminals 111 [ and

andpT],] 5 [and and

6. With accessory .75-kva control transformer, additional controls up to 3800-va inrush and

175-va sealed may be used.

When using a transformer, ground control

circuit by connecting green wire from trans former terminal X2 to ground screw (detailed instructions with transformer package).

When using field-supplied 115-volt control

(L2) must be connected to24power, terminal

neutral or ground potential.

Across-the-line starting is standard on all units.

If it is necessary to modify to part-winding

start, refer to “Modification For Part-Winding Start.”

Form 30HR,HS-7W

SEQUENC^OF OPERATION

The 115-1-60 control power can be supplied directly from a separate source thru a codeapproved fused disconnect or thru a field-installed accessory transformer with the primary side con nected to the unit power terminal block. A double-pole circuit breaker protects the control circuit and serves as the control circuit switch. Crankcase heaters are wired in the control circuit ahead of the START switch, so they are always operative as long as the control circuit breaker is closed. Heaters are wired so they are on only when their respective compressors are cycled off.

..........

t..

After a prolonged shutdown of 8 hours or more, the crankcase heaters should be on for 24 hours before starting the unit.

When power is supplied to the control circuit and the control circuit breaker is closed, the unit is ready for operation, providing all safety devices are satisfied, interlocks are closed, and instructions on warning labels have been followed.

When the START button on the control panel is pressed, a red indicating light on the control panel comes on and the step controller and control relays 1 thru 4 are energized. After a maximum of

1.5 minutes, the recycle relay is energized and the step controller cycles back (in the load direction) to the correct cam position to begin the compres sor starting sequence. The compressors start one at a time at brief intervals until the load requirement is satisfied. After completing the starting sequence,

the controller stops and starts, unloads and loads the compressors to maintain capacity control in response to water temperature controller demand.

Factory cam settings on the step controller protect the compressors against rapid recycling.

Complete Unit Stoppage can be caused by any of

the following conditions: general power failure, blown fuse in control power feed disconnect, open control circuit breaker, STOP button depressed, open contacts in low water temperature cutout, open contacts in any auxiliary interlock between

terminals 11 and 12 .

recast.

Restart Procedure (after cause tor stoppage is

corrected).

GENERAL POWER FAILURE - Press START button on control panel.

BLOWN FUSE IN POWER FEED DISCONNECT — Replace fuse and press START button on control panel.

LOW WATER TEMPERATURE CUTOUT - Press reset button on control (inside control box). Restart is automatic.

AUXILIARY INTERLOCK — Automatic restart after condition is corrected.

OPEN CONTROL CIRCUIT BREAKER ^ Close breaker and press START button on control panel.

HIGH-PRESSURE SWITCH - Press START button on control panel.

LOW-PRESSURE SWITCH — Compressors will restart automatically when pressure comes up sufficiently.

COMPRESSOR MOTOR THERMAL PROTEC TOR — After motor has cooled down, press START button on control panel.

OIL SAFETY SWITCH — Press reset button on the

switch, and press START button on control panel.

MODIFICATION FOR PART-WINDING START

(See Fig. 1,5 and 6.)

For 208-, 230-Volt Units — In the control circuit

for each compressor, add a 1.5 second time-delay relay to actuate the second contactor coil (CA). Time-delay relay. Carrier part number HN67FK001, is available from Carrier Service Parts Center, Syracuse, N.Y. Contact your local Carrier representative. ^

Single-Circuit Stoppage can be caused by open

contacts in any motor thermal protector, open contacts in low-pressure switch, open contacts in high-pressure switch, open contacts in oil safety switch (when used), blown compressor circuit fuse.

Stoppage of one circuit by safety device action does not affect the other circuit. Besides stopping compressors, all the devices listed except the low-pressure switch will close the liquid line solenoid valve for that circuit.

AUX. — Auxiliary Contacts C — Compressor Contactor CA — Second Compressor Contactor TOR — Time-Delay Relay

Fig. 1 — Control Wiring for Part-Winding Start

---------

Field Wiring

Holding Coil Factory Wiring

REMOVE PRESENT JUMPER 11-12

[TT]----------------1 I

CHILLED WATER

CHILLED WATER L COND PUMP OR TOWER FA PUMP STARTER AUX CONTACTS

[ÎÔ]---------------

ГЧ

-----------------

--------------------------------

CHILLED WATER COND. PUMP STARTER AUX. CONTACT OR FLOW SWITCH SHOULD BE FLOW SWITCH LOCATED HERE ONLY WHEN COND PUMP STARTER IS INDEPENDENT

FC2

0~ -

FC|

41]

CONTACTOR COILS FOR COND.

FAN MOTORS WITH SEPARATE AIR COOLED COND. FOR EACH REFRIGERATION CIRCUIT.

-0

Fig. 2 — Suggested Field Wiring of Interlocks

----------------------------0^5

COND PUMP OR TOWER FAN MOTOR 0. L. CONTACTS IF AVAILABLE

OF 30HR, HS WIRING.

(SEE NOTES 5 AND 6)

LEGEND (For Fig. 3 thru 8)

-----------

cÿ5-

■-чт

----------©-----------

CONTACTOR COIL FOR COND. WATER PUMP OR FOR FAN MOTOR(S) ON SINGLE TWO CIRCUIT AIR COOLED COND.

— Balancing Relay

— Compr Contactor

— Second Contactor

— Control Circuit Breaker

— Control Relay

— Fligh Pressurestat

— Liquid Line Solenoid Valve

LLS

— Low Pressurestat

— Limit Switch

LWTC

— Low Water Temp Cutout — Oil Pressure Safety Switch

OPSS

— Recycle Relay

CIRCUIT N0.1

CONTACTORS

COMPR I COMPR 2

CIRCUIT

BREAKERS

C 0

CONTACTOR COIL POWER DISC PLUG

1 2

c 0

FIELD

POWER

SUPPLY

..... O.RS.S. I

I I J(SEE NOTE

'■ 3)

S Step Controller Switch

Starting Relay

SR -

TS -

Transfer Switch (Compr Starting Sequence)

U - Unloader (Compr)

XL - Across-the-Line

Coil

Light (Red)

Terminals on Step Controller

CIRCUIT NO. 2

FIELD

INSTALLEOl

¡accessory!

CONTROL

TRANS-

L. 2QRMERJ CON T. COIL

TERMS Ж

TERWNJl

STRIP

ТПхГораз. 2

TERMS [гЧ

CONTACTORS

CIRCUIT

BREAKER

M P

_a_

2j(SEE NOTE

COMPR 3

/\ Terminals on Temp Controller

□ Terminaison Terminal Strips

--------__

___

______

----------Factory Wired, Field Connected

EXTERNAL CONTROL POWER SOURCE (IF USED)

ITRÔLPOW^

M '

cCP

CKT I , CKT.2

♦ 2

COMP SEQUENCE

О m О

START Ш STOP

Terminals on Compr

Factory V\/iring Factory Wiring on 30FIS Units Only

Field Wiring

UNLOAOER CRANKCASE

• ON 208-, 230-VOLT UNITS ONLY

Fig. 3 — Locations of Control Components (All Voltages)

30HR, HS070, 080, 090

HEATER

COMPR. MOTOR

TERMINAL PLATE

THERMOTECTOR LEADS TO CONTROL CIRCUIT

MOTOR THERMOTECTORS INTERNALLY WIRED IN SERIES TO TERMINALS ABB THROUGH COMMON TERMINALS*

+ 5 hidden pages

Carrier 30HS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Wiring Diagrams

Reciprocating Liquid Chillers

60-Hertz

INDEX

30HR,HS

070 iJ»ru tm

100,

GENERAL NOTES

SEQUENC^OF OPERATION

Fig. 1 — Control Wiring for Part-Winding Start

LEGEND (For Fig. 3 thru 8)