Gulf+Western ACWC-SC Service Manual

MODEL

Screw Type

ACWC-SC

SERVICE

I & 0 6500A

MANUAL

PACKAGED

INSTALLATION,

MAINTENANCE

DESCRIPTION

Inspection & Handling

Location & Mounting ........

Wiring Chiller Start-Up Maintenance Slide Valve Low Control Unit Sequence

Sequence

Control

Power Wiring Diagram Power

Electrical Data Cooler

Unit Troubleshooting Causes & Prevention Start-Up Operating

..............................................................................................................

Piping

Ambient

Settings

Operating Models ACWC-160SC

Model

Wiring

Models ACWC-160SC

Wiring

Model ACWC-215SC

Across-The-Line

Wiring

Star-Delta

Pressure

Loading/Suspension

.....................................................................................................

........................................................................................................

.................

Unloading

Operation

Limitations

of

Operation

of

Operation

ACWC-215SC

Diagram

...................................................................................................

Check

Data

List

...

...........................................................................................

System

.........................................................................................

..................................................................................................

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.............

Start

..........................................................................................

Drops

..........................................................................................

Guide

.................

of

Freeze-Up

.....................................

.....

...........

AIR

COOLED

CHILLERS

OPERATION

&

INSTRUCTIONS

TABLE OF

...

......

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.....

..................................

..................................................................................

......................................................................................

Thru

200SC

Thru

200SC

....

........

Points

..............................................................................

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....

..............................

CONTENTS

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PAGE NO.

....

2 & 3

6 & 7

8 & 9

10 &

12-15

.

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...

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.. 20

2 2 2 2

3 4 5 5 5

11

16 17

18 18 18

. 19

19

20

BOHN

A Gulf+Western

Danville,

..

!

HEAT TRANSFER

Company

Illinois

61832•{217)446-371 0

I

When

unit

is received,

damage

immediately .o.nd

Models permanent are used between may be used distance

responsibility of the factory.

. If

damage

ACWC

angle beam,

provided

in the

under

. Physical damage to the unit, after acceptance,

has

clo.im

160SC

skids

rigging

it

should

occurred

filed

thru

carbon

lines

the

skids

LOCATION & MOUNTING

Model

ACWC

Air

Cooled

INSPECTION & HANDLING

outdoor Air located prevailing

Since condenser above the where required Ductwork

The to located Clearance removal

Unit On

which On

substantial footings should transmission

Vibration locations

application

flow

through

adjacent

wind

these

coil

unit

it

could

overhead

must

unit

must

the

condenser

no

closer than

of

tubes

must be set on a

roof

installations

span

ground

extended

be left between the

mounts

where noise

to

direction.

units

must that

be

not

be

installed

must

be from

load-bearing

level

base

that

of

sound

Packaged Water

and

may

the

condenser

outside

are

air

not

be impeded.

would

recirculated

air

space

be applied

coil

and

four

provided

the

solid

the

unit

walls

installations,

will

not

below

and

may

be used

might

be

it

.

215SC are

steel skids. Ei

to

allow

to

prevent

to

facilitate

be

mounted

is vertical and the

of

building

cooled,

tend

to

back

should

to

the fan

with

sufficient

for

servicing

(4) feet

from

at

either

chiller

.

and level

should

to

prevent excessive

the

settle. A

the

frost

slab

and

vibration

for

be

objectionable.

checked

should

rigging.

the

deflect

unit

line is recommended. A space

.

for

be reported

factory

Spreader bars

damage

moving

Chillers

on

or

on

flow

of

There

must

discharge

to the

be a

minimum outlets

clearance

access. The

any wall

end

foundation

be

mounted

should

one-piece

the

building

roof

mounted

visible

mounted

ght

(8) 2W'

to

roof

or

roof

without

air

inlet

.

or

other

of

the

.

on

be

concrete

or

concealed

to

the carrier

on lifting

the

unit. Rollers

the

unit a short

are

designed

at

ground

unit

regard

to

and

be

no

obstruction

air

downward

of

the unit. The

of

eight

for

air

unit

should

obstruction

unit

support vibration

mounted

to

prevent

units

two

eyes

must

Is

not the

level.

may be

from

the

(8) feet.

entrance

to

permit

beams

.

on a

slab

with

the

or

other

(2)

be

for

be

The

CHILLER

chiller

inlet

(return)

connection

(:.upply)

opposite

A

flow

chilled

Gauges measure

accordance

in the should should should should chiller

The and operation piping or

other

Upon purge points

.

accomplished compartment. inadequate flow

closest

vvdte• 1-'ifJt::

end

of

switch

must

water

piping

should

the

pressure

with

piping

on the

be

employed

be located at all high be located be

provided

and

piping

chilled

water

to

prevent

or

if

should

completion

air

in

freeze

it

be protected against freezing by

suitable means.

from

the

water

through Failure

waterflow

protection.

water

to

the

control

<..v""""'t"'u

the cooler(s).

be installed in a

.

be installed in

drop

submittal

inlet

side

on both the inlet and

to

be accessible

at all

low

system.

piping

should

condensation. If

will

not

be

of

chiller

system .

piping,

Air

circuit.

the

vent

to

purge

and may cause the

pipe

the

and to

data. A

of

the

points

be

drained

purging

Purging

pipe

air

PIPING

should

be

panel end

tv

straight

piping

insure

chiller

insulated

start

from

of

u,.,

wat.,r

horizontal

to

the

strainer

and

in the

to

servicing

to

permit

the system is

in the winter,

the

system water should of

the

located

the

water

unit

connected

the

unit

<,;urrrr.,<,;llun

and

from

proper

(GPM)

should

vibration

outlet

pipes.

piping

system . Vents

. Drain

complete

to

reduce heat

for

the

electric

be

done

chiller

barrel may be

on

the

top

circuit

to

cutout

to the water

and the

outlet

on

the

section

of

the

chiller

flow

be

connections

chilled

heating cable

from

of

will

on

rate

installed

eliminators

Air

vents

drainage

pickup

year-round

water

pump

and

the

high

the

chiller

result in

low

water

to

in

of

..

Refer

to

start, test, and

Check

all

to

electrical

unit

start-up

looseness and

Activate the 115 prior

START-UP

check

and

tighten

volt

mechanical

all screws on electrical

chiller

and crankcase heater

.

list

included

connections

with

terminals

this

manual.

for

.

circuit

shipping

24

hours

~·

A

unit

wiring

istics

and all Separate, field supply

and

should

Separate 115 power

for

control

diagram

factory

supplied,

be

volt

power

and heater

WIRING

showing

supplied

disconnects

within

the

source

circuits

the required wiring

sight

must be field

power

details is

must be installed in the

of

the unit.

.

supply

provided

supplied

character-

with

unit.

power

to

provide

Rotate each fan tension readjust

Check Check

The oil in (page 3).

2

and

pulley

belt

tension

all

control

the

compressor

oil

level

should

accordance

prior

alignment.

settings

be

with

to

start-up

to

accommodate

as

specified in Table

oil level

to

the

top

the

directions

. Fans

should

After

two

through

of

the glass. If

in the

turn

(2) weeks

for

belt stretching.

1.

the

crankcase

the

maintenance

freely.

Check

of

operation,

sight

level is low, add

glass.

instruction

belt

.

--..,_

. CAUTION:

The

discharge

sor. Liquid

All compressors are soli a mountea on 1sopads, therefore,

hold-down cause excessive refrigerant hold-down

line valve

line valves

bolts

line breakage.

bolts

must

not

vibration

for

tightness .

must

be open

also be open

be loosened.

of

the

Prior

to

before

for

sustained

Loosening

compressor

start-up

check

starting

and may result in

MAINTENANCE

CONDENSER

Units

equipped

motors

. Fan belts, fan

maintenance

1. Fan Belts

nearly should maintain checked at three (3)

2.

Fan

Bearings-

the

relubricatable

fittings,

recommended

is with

a hand

sticker

3.

Motor

Bearings-

bearings must

be

time

a bearing can run

will

depend

operating

hour

2000 clean closed grease-free Lubricant

The

air

regular

with belt drive fans have

as

-After

reached

be

good

accessible

attached to the unit.

consume

present

conditions

operating

should

inlet preventative

bearings

follows:

two

(2) weeks

their

checked

fan and

gun

upon

container from

of

permanent

again and

motor

month

Each fan shaft is

type

. Each bearing is provided

through

the bearings be greased

. The suggested greasing interval is

Each

motor

a very small

at all

time

without

the

operating

, the

motor

intervals. The

and

solid

fillers

have a safe

the

condenser

maintenance

and

motor

bearings

operation, the stretch,

proper

operation

intervals.

the

individual

is

equipped

amount

to prevent

having grease added

bearings

should

or

operating

coil

adjustments

, the belt tension

provided

of

motor

conditions. Under

lubricant

be an

anti-friction

other

temperature

should

be

program

inherently

therefore

with

motor

by

adding 4 to

with

ball bearings. Ball

lubricant, but

injury.

should

harmful

kept

.

the

compres-

operation

compressor

these

all

compressor

require

belts will have

, each belt

ball

bearings

with

access panels. It

indicated

The

or

be

lubricated

type

ingredients of

clean

bolts

will

protected

periodic

made.

To

should

grease

5 shots

on a

enough

length

replaced

normal

be

from

bearing

2000° F.

through

.

be

of

at

Locate

the UL-3 residual pressure Pump glass.

Replace the

Do not

Place jumper #4

on

valve

on TER4 to energize

the

normal

2.

RECOMMENDED

SR-30

discharge

(see

drawing

oil

into

this

discharge

allow compressor to run with discharge valve closed.

the

system

wire, make a

terminal

feeding

operat

the

ional

operation

refrigeration

Do not add any other type of oil Do not operate compressor

pressure

below)

by

pushing

flU'

t

u11til

port

"ON-OFF"

"short" for

block

TER5 and the

circuit

SOL

temperature

.

OIL-

oil.

port

; remove

u,.,

cap

switch

you

have

1 ). Reset return

The

If

adjacent

in on the pressure

setting and

unit

oil level

the

uil

level

. Re-open the discharge line valve.

in

the "ON" position. Using

five (5)

seconds

switched

just

"blown

is

factory-charged

to

this factory charge.

is

to

cap and release the

port

Is

to the

tOP

between

terminal

" (e.g.

water

thermostat

allow

unit

below one-half

solenoid

fitting

Of

the

terminal

of a solenoid

terminal

(~1)

to

return

with

BOHN

('h)

valve

itself.

sight

a

#121

to to

sight

glass.

If

the

oil

level is

below

the

type

the

hand

outlined

no

reduction

minimum

refrigeration

and will not mix

screw

Agency

SR-30 is then refill oil is not than these

It obtained SUNISO capacity

3.

COMPRESSOR REPAIRS (Internal) -

authorized suspected .

of

the

attempt

is

suggested

not

on hand , you may drain the entire factory oil charge,

with

SUN ISO 4GS

synthetic

to

operate

two

specified above.

that a gallon and kept on 4GS oil, as

loss, and

BOHN

Service

4. COMPRESSOR REPAIRS (External) -

a

.

a

unloaded valves UL-1 , may be repaired

start,

UL-2

loading

, and

and UL-3.

or

replaced in the field ,

Any

specified

compressor

or

more

at the

job

above,

in

input

if a

compressor

unloading

of

these three (3) solenoid valves

oil. The

with

of

BOHN

site. The

will

result

K.W.

Contact

Proper

is

controlled

as

required .

above, and

factory

SUN

with

substitution

in a

factory

malfunction

HIGH

BOHN

(BOHN) ISO 4GS. Do any

oil

other

SR-30

oil

be

2%

to

4%

or

an

operation

by solenoid

PRESSURE

PORT

of

is

of

1.

OIL LEVEL -

checked stopped must be added .

Oil

should

turn

the

setting

, and system " valve in the

Refrigerant approximately 35 PSIG, discharge after

the

COMPRESSOR

The

oil

periodically,

. If

the

be added

return

wait

ON-OFF" switch

discharge

pressure

80 to 90 PSI G.

but

the residual

check

compressor

oil

water

for

valve)

level is

with

only

thermostat

the

line between

inside

stops.

level in the

the

compressor

below

one-half

with

the

unit

to

pumpdown

in the "OFF"

of

the

The

discharge

will

equalize

compressor(s)

either

(

'12

) the

compressor

(T1) to a

compressor

low

pressure pressure (upstream back

higher

and

position

into

shut

shutoff.

cut-out

the

should running

sight

glass, oil

off. To

temperature

Place the

. Close

and

condenser

will

setting is

suction

do

the

now

of

be

or

so,

line

.

be

the

side

3

SLIDE

VALVE

UNLOADING

SYSTEM

1 ne

tlonn

screw modulation operator valves (UL-1,

The rotors the capacity

Upon to position. After established temperature response

The pressure, whenever

internal

slide

turn;

effective

.

compressor

act

upon

slide

to valve

compressor

consists

to

UL-2 & UL-3)

valve

forms a portion

thus,

its

rotor

the

hydraulic

30 seconds,

to

all

bearings

controller

the

supply

will

of a slide

the

position

length

start-up, UL-3

move

UL-1

capacity

compressor;

piped

with

and

piston,

during

surfaces,

is free

water

temperature

to

the

opens

Load

¢::J

valve and

plus

externally.

of

the

respect

thereby

is opened.

holding

which

UL-3

to

open

left

(loading)

to

permit

Slide Valve

control

system

hydraulic

three

chamber

to

the

This it in

is

closed. At

and close UL-1

.

flow

piston/cylinder

hydraulic

wall in

the

rotors

percent

allows

the

time

full

by

force

to

the

fully

this

oil

Unload

c::>

for

infinite

solenoid

which

determines

of

full load

oil pressure

unloaded

oil

flow

point,

or

UL-2

of

discharge

return

(low

Oil Pressure

the

is

the

in

pressure) line. whenever force

The "

pulses" to The point, will approaches overshooting

This water resulting water

UL-2

of

the

oil

temperature

the

further

the

longer

continue

until

the

method

sensing

in an

temperature

The

slide

opens

the

exceeds

controller appropriate supply

water

is

the

controller

set

point, the

the

set

point.

of

compressor minimizes exceptionally

.

Hydraulic

valve

will

oil

supply

that

of

the

sends a series

solenoid

temperature

duration

Piston

of

is satisfied. As

pulses

unloading

action/reaction

precise

move

to

(high

pressure) line,

discharge

to

adjust

is

the

pulses.

become

in

conjunction

lag

and

stable

the

gas.

of

power

from

The

the

quite

time

Vent

Suction

right

to

load

the

water

control

(unloading)

since

(energizing)

conditions

controller

series

of

temperature

brief

to

with

and

overshoot

of

to

the

set

pulses

prevent

supply

.

r

Screw

Rotor

The

following

operating

modes.

Starting

Loading Unloading

table

Oil

Pressure Lines

lists

solenoid

UL-1

Close Open Close

UL-1

Oil

Return

valve

position

UL-2 UL-3

Close Close

Open

Open Close Close

for

all

three

Oil

Supply

~

'-...../'

4

Due

to

the

wide

operate summer

below the valve control system ambients

the

conditions.

60°

F.

evaporator

operation

with control

indicated:

MEDIUM

(STANDARD

A

fan

cycling Chillers conditions

This cycled two five-fan units. sequence, in

to prov1de

is an

on

and

compressors

units;

With

one

High (Manual Pumpdown (Auto

Fan (Adjustable)

Low (Manual

LOW

range

Air

Cooled

the

pressure

is

below

. As a

the

possibility

are

control

to 30° F.

automatic

off

, as

running, three

four

compressor

response

of

applications,

Packaged

Without

available

differential

the

level

result,

FAN

proper

the

of

allowing

CYCLING

AMBIENT

EQUIPMENT

is

standard

prop

er

operating

operation

required,

fans

on

six-fan

running,

to head pressure.

it

is

Water

Chillers

control,

between

to

insure

unit

may

evaporator

the

CONTROL

-FACTORY

on

all

Air

head pressures, in

in

which

in

response

fans

are

units

; and five

all

but

sometimes

at

ambients

when

ambients

the

proper

freezing.

units

Cooled

the

cycled

the lead fan are

condenser

thermal

cycle

on

to

TO

INSTALLED)

Packaged

condenser

to

head

(in

fans

Three

operate

30°

pressure.

AMBIENT

necessary

below

expansion

low

pressure

types

at

F.

Water

ambient

fans

sequence)

on

seven-fan

cycled

drop

and

the

are

With

on

to

of

in

OPERATION

This by pressure

All the prevent

All auxiliary heater; the thermostatically

The

junction

pressure provides prevent

ACWC-SC

CONTROL

PRESSURE

Pressure

Reset)

Cycling

Pressure Freeze

Control

Reset) HP2 & HP3

Control

Pressure

Reset)

--

ACTUATED

Control

SETTINGS

LPF 2 & LPF-3

arrangement

delaying

is

provides

the

condenser

obtained.

GRAVITY

AMBIENT

LOW

(OPTIONAL

condenser

fan

discharge

convection

compressors

heater

standard

with

down

an

nuisance

LEGEND

HP-1

PD1

PD2 & PD3

2 Fan

Cell FCP 1 FCP 2 295

Cell

3 Fan

FCP 1 260 FCP 2 275 FCP 3

4 Fan

Cell FCP 1 FCP 2 275 FCP3 FCP4

LPF 1

EQUIPMENT-

fans

are

to

minimize

drafts

are

enclosed

is

included

temperature

controlled

condenser

the

discharge

to

oo F.

electrical

tnp-out

equipped

bypass

Cut-In

positive

fan

start-up

operation

control

until a predetermined

down

(Discharge) DAMPERS

CONTROL

FACTORY

with

the

effect

up

through

in

individual

to

supplement

within

the

compressor

.

fan

cycling

dampers, will

ambient. A 90-second

around

during

Cut-In

Cut-Out

Cut-In

Cut-Out

280

290 215

260 285

295

Cut-Out

the

cold

FACTORY

(PSIG)

gravity

of

prevailing

the

condenser

insulated

the

package,

maintain

low

start-up.

SETTING

TO

oo

INSTALLED)

dampers

coil

standard

compartment

operating

time

pressure

300 PISG 365 PSIG

55 PSIG 35 PSIG

Cut-Out

170 180

160 175

160 175 210 235

54 PSIG

to

+30°

F.

mounted

winds;

and

in

still

housings.

crankcase

in

suitable

delay

freezestat

F.

head

on

to

air.

An

is

conhead relay

to

(.

"'-._./

-

Chiller

Low

Chiller

Water

Chiller

Heater

(Non-Adjustable Oil

Temperature (Adjustable) Manual

Capacity

1.

Maximum

2.

Maximum

3.

Maximum

4.

Units Unit

must

5.

TEMPERATURE

Water

Cycling

Thermostat

Reset

Control

ambient allowable allowable

not

have leaving

be

allowed

Temperature

Thermostat

Safety

Control

Thermostat

air

to

condenser cooler water

temperature

to

pumpdown

ACTUATED

Thermostat

(Adj.)

water

(Adjustable)

Mode

Control

is 115° F. (60

pressure

temperatures

to

at the

is 150 PSI G.

cooler

end

UNIT

is 75°

of

each

Hertz

42°

Position

OPERATING

operation).

F.

or

lower

operating

5

LEGEND

T2 T1

Included

CBH1

LIMITATIONS

unless

cycle

With

Heater

OTS

1

OTS

2

OTS3

T3

used

(except

with a glycol

on

safety

control

FACTORY

Cut-Out

Dial Set

solution.

At

Cut

-In 40°

Cut-Out

At

shutdown).

SETTING

37° 55°

45°

240°

44°

F. F. F.

F.

The theory.

12

[12]

(RS)

~

@

&

wiring

diagrams

The

following

Line

number

Line

number Component Normally Normally Holding Note

number

and

key

on

wiring

in

text

identification

open

contact-

closed

contact-

coil -line

sequence

shows

how

diagram

symbol

line

number

KEY

instructions

the

in

number

line

number

location

TO

on

indexing

text

(Relay #5)

location

30

WIRING

the system can be used.

~

DIAGRAM

following

EXAMPLE

§]

pages have been devised

§]

INDEXING

SYSTEM

to

@@&

for

The line

#44;

the

which

~

The

contacts

lines 66, 23, and 54.

This

is

the

number

simplify

holding

(reading

the

holding

The

identifies

the

understanding

coil

for

the

from

left

coil

for

coil

shown

contact

the

line

to

on

first

right)

the

on

line

of

and

See

contact

can

second

this

line

23 is

wiring

tracing

Note

shown

be

found

contact

found

can

normally

shown

of

Number

on

line #74.

be

found

at

the

circuit

on

this

on

line

can be

closed

left.

3

on

.

SEQUENCE

MODELS

The

following

200

SC

wiring

Important Notel

The

compressor

active

PRELIMINARY

Place "OFF" temperature.

Activate 3] on

terminal

up

to

the (R19) (3]. (R20) power to

the

chiller

3) (8, (SCH1,

Close

the

indicating

will be two phase loss monitors, (PLM1) and (PLM2), models).

the

compressor(s)

the

compressors

at

the leads on run

backwards,

COMPRESSOR WARRANTEE!

Start-up the

water

#12 (58] and #13 [60]

sequence

(see Pages 10

diagram

Control Circuit

for a minimum

control

position,

the

115

control

to

the

compressor barrel

9,

1 0]

2,

3)

[3,

main

light

This

Main Incoming Power Terminal Block.

the

phase loss

the

chilled

flow

and

furnished

Identification

Line

crankcase

fa

SEQUENCE

circuit

"ON-OFF"

and set

volt

electrical

board

(TEAS) circuit [5].

and

heater

(optional),

5,

7]

(optional).

power

disconnect

on

the

phase loss

light

must

. If

the

will

not

causing

water

switch

completes

of

monitor,

OF

OPERATION

ACWC

of

operation

11

with

Number

24

hours

the

switches.

(R21) [7] are

crankcase

(CBH1)

and

be on

light

be

severe damage, and WILL VOID

pump.

terminal

160

for

typical

unit

for

Symbol

heater

must

prior

switches

staging

service

to

distribute

Crankcase

heaters.

(11].

the

low

switch.

monitor

to

indicate

is

not

on,

energized.

for

this

The

an

electrical

board (TEAS).

To

200

SC

is

typical

for

the

wiring

diagram).

specific

to

thermostat

to

the ambient

Reverse

water

information.

be

energized

unit

start-up.

(SW1

thru

(T1)

terminals

power

to

the

heater relay

closed

and are

Power

receiver heaters (RH1,

crankcase

Check

to

(PLM1) is

proper

main

DO

allow

flow

circuit

phase

control

any

NOT

the

is

Terminals

the

will

ACWC

Refer

and remain

SW4) in

to

its

highest

#2 and #4

control

contacts

supplying

is also

supplied

heaters

see

that

lit

confirmed

across

the

(NOTE: There

on

208-230 volt

rotation

circuit

two

phase legs

reverse

compressor

terminals

#14 [61]

160

to

the

[1

and

circuit

red

for

the

THE

when

to

Upon (T1) [62]. safety compressor allowing close, controls and 17). Fan

2,

the

NOTE: ALL FAN

Relay (R19) [20] crankcase energizing

to

minutes.

TIMES

to

Time in an out, [74]. solenoid solenoid

and #15 [63] either compressor

Set

the

54°

F.

return

design

the

Place

position, thus

system will compressor will start.

demand

will

closing

controls

bringing

"cut-in"

delay relay (TD1 0) [63]

unloaded

it

will

This

provide

contact

is

running.

staging

water). Set

range

of

four

be

for

close, energizing

(R1)

No.1

the

compressor

(FCP1) and (FCP2) (see

motor

setting

FAN

CYCLING

DIFFERENT HEAD PRESSURES.

heater(s). Relay (R14) (19]

(TD7) [23].

COMPRESSOR

OUT.

energize

allows

valve

(UL

valve (UL2-1) [74].

an

(R14). (R16),

thermostat

operation

(4) energizing

In

and

power

contact

condition

the

control

the "Time-In" mode for five minutes before any

STAGE 1

cooling,

contacts

switches

and

liquid

to

#1

will

of

(FCP1

MOTORS

7-1

This

relay (R4) [27].

the

capacity

1-1) [71].

interlock

(T1)

(e.g. 44°

circuit

the

relay (TD10) (63] and

7-4 [22]. 8-5 [25].

line

to

start. Fan

the

start

CONTROL

[3] opens,

will

#2

contact

for

loading unloading

for

the

water

or

(R18) [62]

to

the

design range

capacity

are closed,

).

ARE

CANNOT

30 seconds. When relay (TD10)

control

F.

supply

switches

balance

first

line

as

force

control

of

LOADING

step

solenoid

contactor

side

Power

Wiring

soon

as

CONTROLELD

AND

de-energizing

compressor

BE

C-NC

closing

thermostat

the

compressor;

the

of

the

(SOL

of

the

contact

STARTED

(26]

contacts

compressor.

pump

will

close

of

thermostat

water) .

(SW1-SW4) in

control

the

staging

and

control

1) (25] (C13) (21]

fan

cycling

Diagram-

head

pressure

BY

WILL

8-5 (24] closes , #1

holds

the

9-6 [71] and 7-4

(T3)

starter(s);

any

time

operation

9-6 (16]. If

circuit

will

THEIR OWN

CUT

compressor#1

to

UNTIL

compressor

or

(e.g.

(T3)

to

the

"ON"

circuit.

The

thermostat

relay (R1)

the

[16]

for

energize,

will

also

pressure

Pages 16

reaches

IN

AT

run

for

five

(TD7)

times

to

energize

to

energize

a

,

-~

\....__./

6

Gulf+Western ACWC-SC Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual