Carrier 30GTN015-035 User Manual

Installation Instructions

Fig. 1 — Model 30GTN (020 Shown)

CONTENTS

Page

SAFETY CONSIDERATIONS
INSTALLATION

Step 1 — Rig and Place the Unit

• RIGGING

• PL A C ING UNIT

• MOUNTING UNIT

Step 2 — Check Compressor Mounting
Step 3 — Cooler Fluid and Drain Piping

Connections

• PREPARATION FOR YEAR-ROUND
OPERATION

• PREPARATION FOR WINTER SHUTDOWN

Step 4 — Make Electrical Connections

• POWER SUPPLY

• POWER WIRING

Step 5 — Install Accessories

• ELECTRICAL

• HOT GAS BYPASS

Step 6 — Refrigerant Circuit

• LEAK TESTING

• DEHYDRATION

• REFRIGERANT CHARGE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

SAFETY CONSIDERATIONS

Installing, starting up, and servicing air-conditioning equip-

ment can be hazardous due to system pressures, electrical com­ponents, and equipment location (roofs, elevated structures,
etc).

Only trained, qualified installers and service mechanics

should install, start up, and service this equipment (Fig. 1).

Untrained personnel can perform basic maintenance func-

tions such as cleaning coils. All other operations should be per­formed by trained service 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.

• Keep quenching cloth and fire extinguisher nearby when

brazing.

• Use care in handling, rigging, and setting bulky

equipment.

• See Tables 1A and 1B for Physical Data.

. . . . . . . . . . . . . . . . . . . . . . 1

. . . . . . . . . . . . . . . . . . 1

. . . . . . . . . . 3

. . . . . . . . . . . 7

. . . . . . . . . . . . . . . . . . . . 11

. . . . . . . . . . . . . . . . . . . . . 11

30GTN015-035

Reciprocating Liquid Chillers

with ComfortLink™ Controls

50/60 Hz

INSTALLATION

Step 1 — Rig and Place the Unit

RIGGING — Preferred method is with spreader bars from
above the unit. Use 2-in. (50 mm) OD pipe or hooks in lifting
holes. Rig with 4 cables and spreader bars. All panels must be
in place when rigging. See rigging label on unit for details con­cerning shipping weights, distance between lifting holes, center
of gravity, and spreader bar dimensions. See Fig. 2.

If overhead rigging is not possible, place chiller on skid or
pad for rolling or dragging. When rolling, use a minimum of
3 rollers. When dragging, pull the pad. Do not apply force to
the unit. When in final position, raise from above to lift unit off
pad.

All panels must be in place when rigging.

PLACING UNIT — There must be at least 4 ft (1.2 m) for
service and for unrestricted airflow on all sides of unit, and a
minimum of 8 ft (2.4 m) clear air space above unit. Provide
ample room for servicing cooler. For cooler removal see clear­ance requirements in Fig. 3-5. For multiple units, allow 8 ft
(2.4 m) separation between units for airflow and service.

If unit is to be used in an area with high solar radiation,
mounted position should be such that control box is not ex­posed to direct solar radiation. Exposure to direct solar radia­tion could affect the temperature switch controlling cooler
heaters. See Table 2.

ELECTRIC SHOCK HAZARD
Open all remote disconnects before servicing

this equipment.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 2
Ta b 5 c

PC 903 Catalog No. 563-068 Printed in U.S.A. Form 30GTN-10SI Pg 1 1-00 Replaces: New

Table 1A — Physical Data — 60 Hz

UNIT 30GTN 015 020 025 030 035
COMPRESSOR Reciprocating, Semi-Hermetic

No. ...Type 1...06DG537 1...06E2250 1...06E7265 1...06E7275 1...06E7299

No. Cyls (ea)...Speed, Rpm (r/s) 6...1750 (29) 4...1750 (29) 6...1750 (29) 6...1750 (29) 6...1750 (29)
Capacity Steps 32 3 3 3
Oil Charge*, Pt (L) 8 (3.8) 17 (8.0) 21 (9.9) 21 (9.9) 19 (9.0)

REFRIGERANT CHG, R-22

Total/Over Clear Glass, lb (kg) 25.0 (11.3)/5.0 (2.3) 31.0 (14.1)/7.0 (3.2) 40.0 (18.1)/12.0 (5.4) 47.0 (21.3)/14.0 (6.4) 57.0 (25.9)/8.0 (3.6)

→

CONDENSER FANS, Type Propeller Type, Direct Drive

No. ...Diameter, in. (mm) 2...30 (762) 2...30 (762) 3...30 (762)

Total Airflow, Cfm (L/s) 10,600 (5000) 15,700 (7400) 23,700 (11 200)
Speed, Rpm (r/s) 1140 (19) 1140 (19) 1140 (19)

CONDENSER COIL, Type Horizontal Plate Fin

Rows...Fins/in. (Fin Spacing mm) 2...19 (1.34) 3...17 (1.49) 2...19 (1.34) 3...17 (1.49) 3...17 (1.49)
Total Face Area, sq ft (m

COOLER Shell and Tube, Direct Expansion

Net Water Volume, gal. (L) 6.8 (25.7) 9.9 (37.5) 12.8 (48.4)
Maximum Design Working Pressure

psig (kPa)

WATER CONNECTIONS, in.

Inlet and Outlet 2 FPT 2
Drain

*See Oil Charge section for Carrier-approved oil.

2

) 23.5 (2.18) 23.5 (2.18) 39.2 (3.64) 39.2 (3.64) 58.4 (5.43)

Refrigerant Side — 235 (1620)

Water Side — 150 (1034)

1

3

/4 MPT

/2 FPT

3

/4 MPT

Table 1B — Physical Data — 50 Hz

UNIT 30GTN 015 020 025 030
COMPRESSOR Reciprocating, Semi-Hermetic

No. ...Type 1...06E2250 1...06E7265 1...06E7275 1...06E7299

No. Cyls (ea)...Speed, Rpm (r/s) 4...1450 (24.2) 6...1450 (24.2) 6...1450 (24.2) 6...1450 (24.2)
Capacity Steps 2333
Oil Charge*, Pt (L) 17 (8.0) 21 (9.9) 21 (9.9) 19 (9.0)

REFRIGERANT CHG, R-22

Total/Over Clear Glass, lb (kg) 26.0 (11.8)/6.0 (2.7) 35.0 (15.9)/8.0 (3.6) 42.0 (19.0)/12.0 (5.4) 49.0 (22.2)/14.0 (6.4)

→

CONDENSER FANS, Type Propeller Type, Direct Drive

No. ...Diameter, in. (mm) 2...30 (762) 2...30 (762)

Total Airflow, Cfm (L/s) 10,600 (5000) 15,700 (7400)
Speed, Rpm (r/s) 950 (15.8) 950 (15.8)

CONDENSER COIL, Type Horizontal, Plate Fin

Rows...Fins/in. (Fin Spacing mm) 2...19 (1.34) 3...17 (1.49) 2...19 (1.34) 3...17 (1.49)
Total Face Area, sq ft (m

COOLER Shell and Tube, Direct Expansion

Net Water Volume, gal. (L) 6.8 (25.7) 9.9 (37.5)
Maximum Design Working Pressure

psig (kPa)

WATER CONNECTIONS, in.

Inlet and Outlet 2 FPT
Drain

*See Oil Charge section for Carrier-approved oil.

2

) 23.5 (2.18) 23.5 (2.18) 39.2 (3.64) 39.2 (3.64)

Refrigerant Side — 235 (1620)

Water Side — 150 (1034)

3

/4 MPT

1201

2

MAXIMUM

UNIT

30GTN

SHIP WT

Lb Kg in. mm in. mm in. mm in. mm
015 1876 851 94.0 2388 48.0 1219 23.0 583 49.5 1256
020 2031 921 94.0 2388 47.5 1207 23.0 583 49.5 1256
025 2415 1095 94.0 2388 51.0 1295 34.5 876 73.5 1867
030 2606 1182 94.0 2388 51.0 1295 34.5 876 73.5 1867
035 3365 1526 127.0 3225 66.5 1689 35.5 901 73.5 1867

LIFTING

HOLES

“A”

CENTER OF GRAVITY

“B” “C”

“D”

Fig. 2 — Rigging with Spreader Bars

(Field Supplied)

Table 2 — Temperature Limits for Standard Units

TEMPERATURE F C
Maximum Ambient Temperature 125 52
Minimum Ambient Temperature 0–18
Maximum Cooler EWT* 95 35
Maximum Cooler LWT 70 21
Minimum cooler LWT† 38 3.3

LEGEND

EWT — Entering Fluid (Water) Temperature
LW T — Leaving Fluid (Water) Temperature

*For sustained operation, EWT should not exceed 85 F (29.4 C).

†Unit requires modification below this temperature.

MOUNTING UNIT — When unit is in proper location, use
of mounting holes in base rails is recommended for securing
unit to supporting structure, or for mounting unit on vibration
isolators if required. See Fig. 3-5. Fasteners for mounting unit

are field supplied. Be sure unit is level to ensure proper oil
return to compressor.

Step 2 — Check Compressor Mounting —

As
shipped, compressor is held down by 4 bolts. After unit is in­stalled, loosen each bolt using nut indicated in Fig. 6 until the
flat washer (

3

/8 in.) can be moved with finger pressure.

Step 3 — Cooler Fluid and Drain Piping Con­nections —

turn water connection is on the left and the leaving water con­nection is on the right. See Fig. 3-5 and 7. Install a minimum
40-mesh strainer in the cooler fluid inlet line just ahead of and
as close as possible to the cooler. Provide a means of venting
air from the high point of the field-installed piping.

After field piping is complete, freeze-up protect ion is rec­ommended using inhibited ethylene glycol or other suitable in­hibited antifreeze solution and electric heat tapes in area where
piping is exposed to low ambient temperatures (34 F [1 C] or
below). Heat tapes should possess a rating for area ambients
and be covered with a suitable thickness of closed-cell
insulation. Route power for heating tapes from a separately­fused disconnect. Identify disconnect as heat tape power source
with a warning that power must not be turned off except when
unit is being serviced.

The cooler drain connection is at the opposite end from th e
compressor (See Fig. 3-5). Insulate the drain piping (in the
same manner as the chilled water piping) for at least one ft
(305 mm) from cooler.

PREPARATION FOR YEAR-ROUND OPERATION — If
unit is on year-round operation, add sufficient inhibited ethyl­ene glycol or other suitable inhibited antifreeze solution to
chilled water to prevent freezing under low-ambient operating
conditions. Consult local water authority on characteristics of
area water and add a recommended inhibitor to the chilled
water.

PREPARATION FOR WINTER SHUTDOWN — Do not

shut off control power disconnect during off-season shutdown.

At end of cooling season:

1. Drain water from system.

2. Replace drain plug and put 2 gall ons (8 liters) of inhib­ited ethylene glycol (or other suitable inhibited anti­freeze) in cooler to prevent freezing of residual water.
(Remove plug on top of leaving chilled water noz zle to
add liquid.)

3. At the beginning of the next cooling season, refill cooler
and add recommended inhibitor.

When facing the cooler side of the unit, the re-

3

NOTES:

1. There must be minimum 8 ft (2.4 m) clear air space above unit.

2. Dimensions in [ ] are in millimeters.

3. The approximate operating weight of the unit is:

60 Hz

UNIT Lb Kg
30GTN015 1640 744
30GTN015C 1732 786
30GTN020 1821 826
30GTN020C 1945 882

UNIT A

30GTN015

30GTN020

(1219)

4

(1207)

′′′′

3

-11

′′′′-0″″″″

1

″″″″

/

2

50 Hz

UNIT Lb Kg
30GTN015 1741 790
30GTN015C 1833 831
30GTN020 1864 846
30GTN020C 1988 902

LEGEND

C—Copper Coils
COMPR — Compressor
MTG — Mounting
NEC — National Electrical Code (U.S.A.)
VAV — Variable-Air Volume

Fig. 3 — Dimensional Drawing, 30GTN015,020

4

NOTES:

1. There must be minimum 8 ft (2.4 m) clear air space above unit.

2. Dimensions in [ ] are in millimeters.

3. The approximate operating weight of the unit is:

60 Hz

UNIT Lb Kg
30GTN025 2170 984
30GTN025C 2324 1054
30GTN030 2268 1029
30GTN030C 2474 1122

LEGEND

C—Copper Coils
COMPR — Compressor
MTG — Mounting
NEC — National Electrical Code (U.S.A.)
VAV — Variable-Air Volume

50 Hz

UNIT Lb Kg
30GTN025 2193 995
30GTN025C 2347 1065
30GTN030 2332 1058
30GTN030C 2538 1151

Fig. 4 — Dimensional Drawing, 30GTN025,030

5

NOTES:

1. There must be minimum 8 ft (2.4 m) clear air space above unit.

2. Dimensions in [ ] are in millimeters.

3. The approximate operating weight of the unit is:

60 Hz

UNIT Lb Kg
30GTN035 2965 1345
30GTN035C 3273 1485

LEGEND

C—Copper Coils
COMPR — Compressor
MTG — Mounting
NEC — National Electrical Code (U.S.A.)

Fig. 5 — Dimensional Drawing, 30GTN035

6

NOTE: All dimensions are in inches.

Fig. 6 — Compressor Mounting

WATER INLET
(RETURN WATER)

Liquid Chiller

IN

WATER OUTLET
(LEAVING WATER)

OUT

REFRIGERATING

MACHINE
U.N.2857

WATER
DRAIN

Fig. 7 — Water Connection Locations

Step 4 — Make Electrical Connections

POWER SUPPLY — Electrical characteristics of available
power supply must agree with unit nameplate rating. Supply
voltage must be within limits shown in Tables 3A and 3B.

IMPORTANT: Operating unit on improper supply volt­age or with excessive phase imbalance constitutes abuse
and may affect Carrier warranty.

POWER WIRING — All power wiring must comply with ap­plicable local and national codes. Install field-supplied branch
circuit fused disconnect(s) per NEC (N ational Electrical Code,
U.S.A.) of a type that can be locked OFF or ON. Disconnect(s)
must be within sight from and readily accessible from unit in
compliance with NEC Article 440-14.

General Wiring Notes

1. The control circuit power must be from a separate source
and must be brought through a field-supplied fused dis­connect rated at 15 amps for 230-v and 30 amps for 115-v
control power. Two terminal blocks are provided for
field-wired control devices.

2. Crankcase and cooler heaters are wired in the control cir­cuit so they are always operable as long as the control
power disconnect is on and safety de vice is open or the
Enable-Off-Remote contact switch is in t he Off position.
Heaters are wired so that they ar e energized even when

power to the Main Base Board (MBB) is off. They are
protected by a 7-amp fuse in field-supplied control power
supply disconnect.

3. The control circuit field-supplied disconnect should never

be off except when unit is being serviced or is to be down
for a prolonged period, in which case cooler should be
drained. When operation is resumed, crankcase heater
should be energized for 24 hours before start-up.

4. Power entry is at one end only.

5. Maximum field wire sizes allowed by lugs on terminal
block are:

350 kcmil for 30GTN030,035 (208/230-3-60) and
30GTN030 (230-3-50) units.

2/0 A WG for all other units.

6. Termina ls for field power supply are suitable for copper,
copper-clad aluminum, or aluminum conductors. Insula­tion must be rated 167 F (75 C) minimum.

Field Connections
Main Power — Bring wires from the fused disconnect switch

through hole in bottom rail of unit to control box (Fig. 3-5) and
connect to terminals on terminal block TB1 (See Fig. 8).

Control Power — Bring separate source power (see Fig. 8,
note 2) into unit as shown in Fig. 3-5. This supplies power for
control circuit, compressor crankcase heater, and cooler heater.

Connect incoming wires to TB4 in unit control box (L1 to
and L2 to ). Neutral side must be connec ted to the neutral

terminal block (by C-A1) for 380-3-60 and 400-3-50 V units
only. In the auxiliary power supply a field-supplied disconnect
with 15-amp circuit protection must be provided to accommo­date crankcase heater and cooler heater cable.

To co mply with NEC Article 440-14, the disconnect must

be located within sight from and readily accessible from unit.

IMPORTANT: To ensure power to the heaters, make
sure auxiliary power to unit is always on (except for
servicing or prolonged shutdown).

A toggle switch (marked Emergency On-Off on the unit
label diagram and by the switch) allows the control circuit to be
manually disconnected when necessary. This switch does not
affect the crankcase heater and cooler heater cable.

7

Table 3A — Electrical Data — Standard Unit

UNIT
SIZE

30GTN

015

020

025

030

035

See Legend and Notes on page 9.

Voltag e

V-Hz (3 Ph )

208/230-60 187 253 82.2 125 278.4 100 115-60 104 127 30

460-60 414 506 38.3 60 126.2 45 115-60 104 127 30
575-60 518 633 31.7 50 102.8 40 115-60 104 127 30

380-60 418 342 43.9 70 152.8 60 230-60 198 254 15
380/415-50 342 440 49.4 80 179.0 60 230-50 198 254 15
208/230-60 187 253 97.4 150 357.4 125 115-60 104 127 30

460-60 414 506 49.6 80 179.2 60 115-60 104 127 30

575-60 518 633 42.9 70 126.8 60 115-60 104 127 30

380-60 418 342 51.1 80 198.8 60 230-60 198 254 15
380/415-50 342 440 60.5 100 229.0 80 230-50 198 254 15
208/230-60 187 253 124.7 200 458.4 150 115-60 104 127 30

460-60 414 506 60.7 100 229.2 80 115-60 104 127 30

575-60 518 633 52.4 80 170.8 70 115-60 104 127 30

380-60 418 342 64.7 110 254.8 80 230-60 198 254 15
380/415-50 342 440 68.5 110 259.0 90 230-50 198 254 15
208/230-60 187 253 145.5 250 518.4 175 115-60 104 127 30

460-60 414 506 68.7 110 259.2 90 115-60 104 127 30

575-60 518 633 54.9 90 182.8 70 115-60 104 127 30

380-60 418 342 73.6 125 287.8 90 230-60 198 254 15
380/415-50 342 440 87.8 150 351.0 110 230-50 198 254 15
208/230-60 187 253 203.0 350 708.6 250 115-60 104 127 30

460-60 414 506 91.1 150 354.3 110 115-60 104 127 30

575-60 518 633 81.6 125 286.2 100 115-60 104 127 30

380-60 418 342 111.1 175 393.7 150 230-60 198 254 15

UNIT CONTROL CIRCUIT

Supplied*

Min Max Min Max

MCA MOCP ICF

Rec Fuse

Size

V-Hz

(Single Ph)

Supplied

MCA and

MOCP

8

Table 3B — Electrical Data — Unit with Factory-Installed Motormaster® I Control

UNIT

SIZE

30GTN

015

020

025

030

035

ICF —

MCA —

MOCP —

*Units are suitable for use on electrical systems where voltage sup-

plied to unit terminals is not below or above listed minimum and
maximum limits.

NOTE: Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to determine
the percent voltage imbalance.

Percent Voltage Imbalance

= 100 x

Example: Supply voltage is 240-3-60.

Vo lt a ge

V-Hz (3 Ph )

208/230-60 187 253 82.2 125 278.4 100 115-60 104 127 30

460-60 414 506 38.3 60 129.3 45 115-60 104 127 30
575-60 518 633 30.8 50 105.6 40 115-60 104 127 30

380-60 418 342 43.9 70 152.8 60 230-60 198 254 15
380/415-50 342 440 51.9 80 181.5 70 230-50 198 254 15
208/230-60 187 253 97.4 150 357.4 125 115-60 104 127 30

460-60 414 506 49.6 80 182.3 60 115-60 104 127 30

575-60 518 633 42.0 70 129.6 50 115-60 104 127 30

380-60 418 342 51.1 80 198.8 60 230-60 198 254 15
380/415-50 342 440 63.0 100 231.5 80 230-50 198 254 15
208/230-60 187 253 124.7 200 458.4 150 115-60 104 127 30

460-60 414 506 60.7 100 232.3 80 115-60 104 127 30

575-60 518 633 51.5 80 173.6 70 115-60 104 127 30

380-60 418 342 64.7 110 254.8 80 230-60 198 254 15
380/415-50 342 440 71.0 110 261.5 90 230-50 198 254 15
208/230-60 187 253 145.5 250 518.4 175 115-60 104 127 30

460-60 414 506 68.7 110 262.3 90 115-60 104 127 30

575-60 518 633 54.0 90 185.6 70 115-60 104 127 30

380-60 418 342 73.6 125 287.8 90 230-60 198 254 15
380/415-50 342 440 90.3 150 353.5 110 230-50 198 254 15
208/230-60 187 253 203.0 350 708.6 250 115-60 104 127 30

460-60 414 506 91.1 150 357.4 110 115-60 104 127 30

575-60 518 633 80.7 125 289.0 100 115-60 104 127 30

380-60 418 342 111.1 175 393.7 150 230-60 198 254 15

Maximum Instantaneous Current Flow during starting
(the point in the starting sequence where the sum of
the LRA for the starting compressor, plus the total
RLA for all running compressors, plus the total FLA for
all running fan motors is maximum).
Minimum Circuit Amps (complies with National Elec­trical Code [NEC, U.S.A.], Section 430-24)
Maximum Overcurrent Protection

max voltage deviation from average voltage

average voltage

Supplied*

Min Max Min Max

LEGEND

UNIT CONTROL CIRCUIT

MCA MOCP ICF

4

239

Supplied

MCA and

MOCP

Rec Fuse

Size

Determine maximum deviation from average voltage:

(AB) 243 – 239 = 4 v
(BC) 239 – 236 = 3 v
(AC) 239 – 238 = 1 v

Maximum deviation is 4 v. Determine percent voltage imbalance:

% Voltage Imbalance = 100 x

This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.

IMPORTANT: Contact your local electric utility company
immediately if the supply voltage phase imbalance is more
than 2%.

V-Hz

(Single Ph)

= 1.7%

Average voltage =

AB = 243 v
BC = 236 v
AC = 238 v

243 + 236 + 238

= 239 v

3

9

C — Compressor Contactor
CB — Circuit Breaker
CCN — Carrier Comfort Network
CWFS — Chilled Water Flow Switch
CWP — Chilled Water Pump
CWPI — Chilled Water Pump Interlock
FC — Fan Contactor
GCS — Ground Current Sensor
LEN — Local Equipment Network
MBB — Main Base Board
NEC — National Electrical Code

TB — Te rm in al Bl oc k
TDR — Time Delay Relay
TRAN — Transformer

LEGEND

(U.S.A. Standard)

Field Power Wiring

Field Control Power Wiring

Field Control Wiring

Factory-Installed Wiring

Field-Installed Device

TB4

REMOTE

ON-OFF

NOTES:

1. Factory wiring is in accordance with the National Electrical Code. Any field mod­ifications or additions must be in compliance with all applicable codes.

2. Connect separate source of control power from field supplied fused disconnect
to terminal 1 of TB4. Neutral side must be connected to terminal 2. This provides
power for the unit control circuit, cooler heater and compressor crankcase
heater.

3. All field interlock contacts must have minimum rating of 360 va pilot duty plus
capacity required for field-installed equipment.

4. For internal unit wiring reference wiring book or unit wiring label diagram.

5. For GCS accessory, remove jumper wire between terminals 5 and 8 on terminal
block TB2.

6. For part wind start accessory, remove gray jumper wire between C-A1-C1 and
C-A1A-C1. Time delay relay shown in suggested mounting position.

7. Voltage requirements:

MAIN POWER CONTROL POWER

208/230-3-60 115-1-60

460-3-60 115-1-60
575-3-60 115-1-60
380-3-60 220-1-60

380/415-3-50 230-1-50

Fig. 8 — Field Wiring Schematic

10

Step 5 — Install Accessories

ELECTRICAL — A number of electrical accessories are
available to provide the following optional features (for details,
refer to the Controls, Start-Up, Operation, Service, and
Troubleshooting book):

• Energy Management Module (used for any of the fol­lowing types of temperature reset, demand limit and ice
features):

— 4 to 20 mA leaving fluid temperature reset (requires

field-supplied 4 to 20 mA generator)

— 4 to 20 mA cooling set point reset (requires field-

supplied 4 to 20 mA generator)

— Discrete inputs for 2-step demand limit (requires field-

supplied dry contacts)

— 4 to 20 mA demand limit (requires field-supplied 4 to

20 mA generator)

— Discrete input for Ice Done switch (requires field-

supplied dry contacts)

• Chilled fluid flow switch/interlock

• Navigator display:
Provides hand-held, mobile capability using easy to read

4-line display . Keypad function is the same as the Scrolling
Marquee module. Features magnet for ‘hands free’ service
of components.

HOT GAS BYPASS — Hot gas bypass usually is not rec­ommended because it results in application of equipment out
of its normal design application range. However, if its use is
required, the appropriate hot gas bypass package may be used.
For installation details, refer to separate instructions supplied
with the accessory package.

Step 6 — Refrigerant Circuit

LEAK TESTING — Units are shipped with complete op­erating charge of R-22 (see Tables 1A-1B) and should be
under sufficient pressure to conduct a leak test. If there is no
pressure in the system, use standard refrigeration practices to
search for the leak. Repair the leak using good refrigeration
practices. After leaks a re repaired, system must be evacuated
and dehydrated prior to recharging with refrigerant.

DEHYDRATION — Refer to Carrier Standard Service Tech­niques Manual, Chapter 1, Refrigerants, Sections 6 and 7 for
details. Do not use compressor to evacuate system.

REFRIGERANT CHARGE (Refer to Table 1A or 1B) —
Immediately ahead of filter drier in each circ uit is a factory­installed liquid line service valve. Each valve has a
Schrader connection for charging liquid refrigerant.

1

/4-in.

11

Copyright 2000 Carrier Corporation

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 2
Ta b 5 c

PC 903 Catalog No. 563-068 Printed in U.S.A. Form 30GTN-10SI Pg 12 1201 1-00 Replaces: New