Carrier 12, 50LJQ008 User Manual

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50LJQ008,012 (50 Hz)

Single-Package Rooftop Heat Pump Units

Installation, Start-Up and Service

Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS .................. 1

INSTALLATION ............................ 1-16

Step 1 — Provide Unit Support .............. 1

• ROOF CURB

• SLAB MOUNT

Step 2 — Field Fabricate Ductwork ........... 1

Step 3 — Make Field Connection for

Condensate Disposal .........................3

Step 4 — Rig and Place Unit ................. 3

Step 5 — Make Electrical Connections ....... 7

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

• HEAT ANTICIPATOR SETTINGS

Step 6 — Adjust Indoor-Fan Speed ...........13

START-UP ................................17-19

SERVICE ..................................19-21

SAFETY CONSIDERATIONS

Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components. Only trainedandqualiﬁed service personnel should install, repair or service air conditioning equipment.

Untrained personnel can perform basic maintenance functions of cleaning coils and ﬁlters and replacing ﬁlters. All other operations should be performed by trained service personnel. When working on air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safetycodes. Wearsafety glasses andwork gloves. Use quenching cloth for unbrazing operations. Have ﬁre extinguisher available for all brazing operations.

Before performing service or maintenance operations on unit, turn offmain power switch to unit. Electrical shock could cause personal injury.

INSTALLATION

Unit is shipped in the vertical conﬁguration. To convert to horizontal conﬁguration, remove side duct opening covers. Using the same screws, install covers on vertical duct openings with the insulation-side down. Seals around duct openings must be tight.

IMPORTANT: An external ﬁlter kit MUST be used, or the ﬁlters MUST be ﬁeld-installed outside the unit on horizontal applications with accessory economizer or two-position damper. Otherwise, the economizer or two-position must be partially removed to access the ﬁlters. The area of the ﬁeld-installed ﬁlters should be equal to the area of the factory-installed ﬁlters.

Step 1 — Provide Unit Support

ROOF CURB — Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 1. Install insulation, cant strips, rooﬁng and counter ﬂashing as shown. Ductwork must be attached to curb, not to the unit. If electric or control power is to be routed through the curb, attach the accessory thru-the-curb service connection plates to the roof curb in accordance with the accessory installation instructions. Connection plates must be installed before unit is set in roof curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 1. Improperly applied gasket also can result in air leaks and poor unit performance.

Curb should be level. Unit leveling tolerances are shown in Fig. 2. This is necessary for unit drain to function properly. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

SLAB MOUNT (Horizontal Units Only) — Provide a level concrete slab that extends a minimum of 152 mm (6 in.) beyond unit cabinet. The slab should be 203 mm (8 in.) thick with 102 mm (4 in.) above grade. Install a gravel apron in front of outdoor coil air inlet to prevent grass and foliage from obstructing airﬂow. In areas where high snowfall occurs, increase height of slab to ensure that snow does not block coil.

NOTE: Horizontal units may be installed on a roof curb if required.

Step 2 — Field Fabricate Ductwork — On verti-

cal discharge units, secure all ducts to roof curb and building structure. Do not connect ductwork to unit. For horizontal applications, ﬁeld-supplied ﬂanges should be attached to horizontal discharge openings and all ductwork attached to the ﬂanges. Insulate and weatherproof all external ductwork, joints and roof openings with counter ﬂashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable ﬁre codes.

Aminimumclearance to combustibles is not required around ductwork on vertical discharge units. On horizontal discharge units, a minimum clearance of 25 mm (one in.) is required for the ﬁrst 305 mm (12 in.) of ductwork.

Cabinet return-air static shall not exceed −87 Pa (−.35 in. wg) with economizer or −112Pa (−.45 in. wg) without economizer.

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

Catalog No. 015-015 Printed in U.S.A. Form 50LJQ-C1SI Pg 1 1-92 Replaces: New

ROOF CURB

ACCESSORY

50DJ901371

50DJ901381

‘‘A’’ UNIT SIZE

18-29 [356]

50LJQ008,012

28-09 [610]

UNIT SIZE ‘‘F’’ POWER ‘‘G’’ CONTROL

50LJQ008,012

19 [25] NPT or

29 [51] NPT

NOTES:

1. Roof curb accessory is shipped unassembled.

2. Insulated panels: 25 mm (one in.) thick polyurethane foam, .8 Kg (1

3. Dimensions in [ ] are in millimeters.

4. Roof curb: 16-gage steel.

5. Attachductworktocurb (ﬂanges of duct rest on curb).

6. Service clearance 1219 mm (4 ft) on each side.

⁄49 [19] NPT 50DJ901311

7. Direction of airﬂow.

8. Control and power service plates are part of a separately shipped accessory package.

⁄4lb) density.

CONNECTOR

PKG. ACC.

Fig. 1 — Roof Curb Dimensions

MAXIMUM ALLOWABLE DIFFERENCE

A-B B-C A-C

mm in. mm in. mm in.

13 .5 25 1.0 25 1.0

Fig. 2 — Unit Leveling Tolerance

Step 3 — Make Field Connection for CondensateDisposal —

See Fig. 3. A3⁄4-in. FPT connection is located on the side of the unit. Use a trap at least 100 mm (4 in.) deep, and protect against freeze-up.

If drain line is run to a drain, pitch line away from unit at 25 mm (one in.) per 3 m (10 ft) of run. Do not use a pipe size smaller than the unit connection.

Units must have an external trap added.

Step4 — Rig andPlace Unit — Inspect unit for trans-

portation damage. File any claim with transportation agency. Keep unit upright and do not drop. Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Level by using unit frame as a reference. See Tables 1A and 1B and Fig. 4 for additional information. Operating weight is shown in Tables 1A and 1B and Fig. 4.

Lifting holes are provided in base rails as shown in Fig. 4 and 5. Refer to rigging instructions on unit.

All panels must be in place when rigging.

POSITIONING — Maintain clearance around and above unit to provide proper air ﬂow and service access. See Fig. 5.

Position unit on roof curb so that the following clearances

are maintained; 6 mm (

⁄4in.) clearance between roof curb and base rails on each side and front of unit: 29 mm (15⁄ in.) clearance between roof curb and rear of unit (see Fig. 1, section C-C).

Do not install unit in an indoor location. Do not locate unit air inlet near exhaust vents or other sources of contaminated air.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

After unit is in position, remove polyethylene shipping wrapper and rigging skid.

NOTE: Trap should be deep enough to offset maximum unit static difference. A 100 mm (4 in.) trap is recommended.

Fig. 3 — External Trap Condensate Drain

NOTES:

1. Dimensions in ( ) is in millimeters.

2. Hood rigging shackles through holes in base rail, as shown in detail ‘‘A’’. Holes in base rails are centered around the unit center of gravity. Use wooden top skid when rigging to prevent rigging straps from damaging unit.

3. Weightsdonotincludeeconomizer .SeeTables1A and 1B for economizer weights.

All panels must be in place when rigging.

Fig. 4 — Rigging Details

UNIT

50LJQ

008 840 381 87.38 2219 40.25 1022 41.31 1050 012 940 426 87.38 2219 40.25 1022 48.31 1253

MAX

WEIGHT

lb kg in. mm in. mm in. mm

‘‘A’’ ‘‘B’’ ‘‘C’’

DIMENSIONS

Table 1A — Physical Data (SI)

BASE UNIT 50LJQ 008 012 NOMINAL CAPACITY (kW) 23.2 28.8 OPERATING WEIGHT (kg)

Unit 381 426 With Economizer 401 446 Roof Curb 101 101

COMPRESSOR

Quantity 22 Oil (ml) (each compressor) 1627 2071

REFRIGERANT TYPE

Operating Charge (kg)

Circuit 1 3.7 4.0 Circuit 2 3.2 3.9

OUTDOOR FAN

Quantity...Diameter (mm) 1...660 1...660 Nominal L/s 2900 3260 Motor BkW...r/s .25...16.0 .25...16.0

OUTDOOR COIL

Rows...Fins/m 2...669 2...669 Total Face Area (sq m) 1.9 2.3

INDOOR FAN

Size (mm) 381 x 381 381 x 381 Type Drive Belt Belt Nominal L/s 1200 1600 Motor BkW per NEC* 1.12 1.50 Maximum Continuous BkW 1.79 2.16 Motor Frame 56 56 Fan r/s Range 10.30-14.70 11.50-15.00 Motor Bearing Type Ball Ball Maximum Fan r/s 26.7 26.7 Motor Pulley Pitch Diameter

A/B (mm)

Fan Pulley Pitch Diameter (mm) 140 178 Belt — Type...Length (mm) A...1219 A...1295 Pulley Center Line Distance (mm) 425-489 464-527 Fan Shaft Diameter at Pulley (mm) 25 25 Speed Change per Full Turn of

Movable Pulley Flange (r/s)

Movable Pulley Maximum Full

Turns from Closed Position

Factory Setting — Full Turns Open 55 Factory Speed Setting (r/s) 10.3 11.5

INDOOR COIL Enhanced Copper Tubes, Aluminum Double Wavy Fins,

Rows...Fins/m 3...590 3...590 Total Face Area (sq m) .74 .93

OUTDOOR-AIR INLET SCREENS Cleanable

Quantity...Size (mm)

RETURN-AIR FILTERS Disposable

Quantity...Size (mm)

Enhanced Copper Tubes, Aluminum Fins, Acutrol™ Feed Device

61/86 86/112

.88 .70

4...406 x 508 x 50 4...508 x 508 x 50

LEGEND

BkW — Brake Kilowatt NEC — National Electrical Code (U.S.A. Standard)

*Used to determine wire sizing per NEC.

Hermetic

R-22

Propeller

Centrifugal

Acutrol Feed Device

1...508 x 635 x 25

1...406 x 635 x 25

Table 1B — Physical Data (English)

BASE UNIT 50QJ 008 012 NOMINAL CAPACITY (tons) 6.6 8.2 OPERATING WEIGHT (lb)

Unit 840 940 With Economizer 884 984 Roof Curb 223 223

COMPRESSOR

Quantity 22 Oil (ﬂuid oz) (each compressor) 55 70

REFRIGERANT TYPE

Operating Charge (lb-oz)

Circuit 1 8-2 8-14 Circuit 2 7-0 8-10

OUTDOOR FAN

Quantity...Diameter (in.) 1...26 1...26 Nominal Cfm 6100 6900 Motor Hp...Rpm

OUTDOOR COIL

Rows...Fins/in. 2...17 2...17 Total Face Area (sq ft) 20.5 25.0

INDOOR FAN

Size (in.) 15x15 15x15 Type Drive Belt Belt Nominal Cfm 2600 3400 Horsepower per NEC* 1.5 2.0 Maximum Continuous Bhp 2.4 2.9 Motor Frame 56 56 Fan Rpm Range 622-882 692-896 Motor Bearing Type Ball Ball Maximum Fan Rpm 1600 1600 Motor Pulley Pitch Diameter

A/B (in.)

Fan Pulley Pitch Diameter (in.) 5.5 7.0 Belt — Type...Length (in.) A...48 A...51 Pulley Center Line Distance (in.) 16.75-19.25 18.25-20.75 Fan Shaft Diameter at Pulley (in.) 11 Speed Change per Full Turn of

Movable Pulley Flange (rpm)

Movable Pulley Maximum Full

Turns from Closed Position

Factory Setting — Full Turns Open 55 Factory Speed Setting (Rpm) 620 690

⁄3...960

Enhanced Copper Tubes, Aluminum Fins, Acutrol™ Feed Device

2.4/3.4 3.4/4.4

52 42

INDOOR COIL Enhanced Copper Tubes, Aluminum Double Wavy Fins,

Rows...Fins/in. 3...15 3...15 Total Face Area (sq ft) 8.0 10.0

OUTDOOR-AIR INLET SCREENS Cleanable

Quantity...Size (in.)

RETURN-AIR FILTERS

Quantity...Size (in.) 4...16 x 20 x 2 4...20 x 20 x 2

LEGEND

Bhp — Brake Horsepower NEC — National Electrical Code (U.S.A. Standard)

*Used to determine wire sizing per NEC.

Hermetic

R-22

Propeller

Centrifugal

Acutrol Feed Device

1...20 x 25 x 1

1...16 x 25 x 1 Disposable

⁄3...960

UNIT

50LJQ

STD. UNIT

WEIGHT Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft-in. mm Ft-in. mm

ECONOMIZER

WEIGHT

CORNER

WEIGHT ‘‘A’’

CORNER

WEIGHT ‘‘B’’

CORNER

WEIGHT ‘‘C’’

CORNER

WEIGHT ‘‘D’’

008 840 381 44 20 182 83 156 71 231 105 271 123 2-0 012 940 426 44 20 204 93 174 79 259 117 303 137 1-2

NOTES:

1. Dimensions in [ ] are in millimeters.

2. Center of gravity.

3. Direction of airﬂow.

4. Ductwork to be attached to accessory roof curb only.

5. Minimum clearance (local codes or jurisdiction may prevail): a. Bottom to combustible surfaces (when not using curb) 25 mm

(one in.).

b. Condenser coil, for proper airﬂow, 914 mm (36 in.) one side,

305 mm (12 in.) the other. The side getting the greater clearance is optional.

c. Overhead 1524 mm (60 in.) to assure proper outdoor fan

operation. d. Between units, control box side, 1067 mm (42 in.). e. Between unit and ungrounded surfaces, control box side, 914

mm (36 in.). f. Between unit and block or concrete walls and other grounded

surfaces, control box side 1067 mm (42 in.). g. Horizontal supply and return end, zero mm (zero in.).

6. With the exception of the clearance for the outdoor coil as stated in notes 5b and c, a removable fence or barricade requires no clearance.

‘‘H’’ ‘‘J’’ ‘‘K’’

⁄8632 3-55⁄161050 2-911⁄16856

⁄8378 4-15⁄161253 3-03⁄8924

CONNECTION SIZES

⁄89 dia [35] ﬁeld power supply hole

A 1

⁄29 dia [64] power supply knockout

B 2

⁄49 dia [44] charging-port hole

C 1

⁄89 dia [22] ﬁeld control wiring hole

⁄49-14 NPT condensate drain

E F 29 dia [51] power supply knockout

Fig. 5 — Base Unit Dimensions

Step 5 — Make Electrical Connections

Unit cabinet must have uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with U.S.A. National Electrical Code (Ref: ANSI/NFPA 70-1987) or equivalent local electrical codes. Failure to follow this warning could result in the installer being liable for personal injury of others.

FIELD POWER SUPPLY — Pigtails are provided for ﬁeld wire connections. Use factory-supplied splices or copper/ aluminum connector.

When installing units, provide a disconnect per local codes. All ﬁeld wiring must comply with local requirements.

Install conduit through side panel openings. For units without electric heat, install conduit between disconnect and control box. Install power lines to terminal connections as shown in Fig. 6. For units with electric resistance heat, refer to Table 2 to determine appropriate power wiring ﬁgure (Fig.7-13) and route lines as indicated in appropriate ﬁgure.

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate (also see Table 2). On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in Table 2, Note 3 to determine the % voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.

When electric heat is installed, remove knockouts for appropriate size conduit from unit block-off panel and single point box. Install conduit (rigid or electro-metallic tubing) through conduit drip boot as shown in Fig. 14. Drip boot eliminates the need for water tight conduit ﬁttings at the single point box. Refer to Fig. 15 for component locations.

LEGEND

C—Contactor IFC — Indoor-Fan Contactor TB — Terminal Block

Field Wiring Factory Wiring

Splice Connection (Factory Supplied)

Fig. 6 — Power Wiring Connections

LEGEND FOR FIG. 7-13

EQUIP — Equipment FU — Fuse GND — Ground HTR — Heater TB — Terminal Block

Fig. 7 — Electric Heater Power Wiring Connections — 50LJQ, 220-3-50 and 400-3-50;

Single Point Kit 50DJ902021 and 50DJ902071

Fig. 8 — Electric Heater Power Wiring Connections — 50LJQ, 400-3-50;

Single Point Kit 50DJ902041 and 50DJ902101

Fig. 9 — Electric Heater Power Wiring Connections — 50LJQ, 400-3-50;

Single Point Kit 50DJ902061 and 50DJ902121

Fig. 10 — Electric Heater Power Wiring Connections — 50LJQ, 220-3-50;

Single Point Kit 50DJ902031 and 50DJ902081

Fig. 11 — Electric Heater Wiring Connections — 50LJQ, 220-3-50;

Single Point Kit 50DJ902051 and 50DJ902111

LEGEND FOR FIG. 7-13

EQUIP — Equipment FU — Fuse GND — Ground HTR — Heater TB — Terminal Block

Fig. 12 — Electric Heater Power Wiring Connections — 50LJQ, 220-3-50;

Single Point Kit 50DJ902091

Fig. 13 — Electric Heater Power Wiring Connections — 50LJQ, 220-3-50;

Single Point Kit 50DJ902131

LEGEND FOR FIG. 7-13

EQUIP — Equipment FU — Fuse GND — Ground HTR — Heater TB — Terminal Block

Table 2 — Electrical Data

UNIT

50LJQ

008

012

VOLTAGE

NOMINAL

V-PH-HZ

220-3-50 198 242 15.3 82.0 1.5 1.5 5.8

400-3-50 360 440 7.7 41.0 1.5 1.5 2.6

220-3-50 198 242 19.6 105.0 1.5 2.0 7.5

400-3-50 360 440 10.4 55.0 1.5 2.0 3.5

RANGE

Min Max RLA LRA FLA Hp FLA

COMPR

(each)

OFM IFM ELECTRIC HEAT POWER SUPPLY

LEGEND

COMPR — Compressor FLA — Full Load Amps HACR — Heating, Air Conditioning and Refrigeration IFM — Indoor-Fan Motor LRA — Locked Rotor Amps MCA — Minimum Circuit Amps MOCP — Maximum Overcurrent Protection OFM — Outdoor-Fan Motor RLA — Rated Load Amps

*Heaters are ﬁeld-installed only. Heater capacity (kW) is based on

heater voltage of 230 v or 400 v.If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

†Fuse or HACR circuit breaker.

**Requires 2 heater packages. NOTES:

1. MCA and MOCP values are calculated in accordance with NEC

(National Electric Code) (U.S.A. Standard), Article 440.

2. Motor RLA and FLA values are established in accordance with UL

(Underwriters’ Laboratories) Standard 465 (U.S.A. Standard).

3. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%.

the % voltage imbalance. % Voltage Imbalance

= 100 x

max voltage deviation from average voltage

Use the following formula to determine

average voltage

ELECTRIC HEAT

Nominal

kW*

— — 41.7 50 — —

9.5 24.7 70.3 80 10 711

14.6 38.0 85.7 90 10 601

22.7 59.0 130.0 150 11 611

29.3 76.2 158.5 175 11 621

38.8 100.9 179.5 200 12 711, 621**

10.5 15.2 21.4 25 7 681

12.5 18.0 44.0 45 7 631

21.0 30.3 59.3 60 8 641

25.0 36.1 66.5 70 8 651

31.5 45.5 78.3 80 9 681, 641** — — 53.1 60 — —

9.5 24.7 81.6 90 10 711

14.6 38.0 97.1 100 10 601

29.3 76.2 141.3 150 11 621

43.9 114.1 190.9 200 13 601, 621**

10.5 15.2 28.4 35 7 681

12.5 18.0 51.0 60 7 631

21.0 30.3 66.3 70 8 641

25.0 36.1 73.5 80 8 651

31.5 45.5 85.2 90 9 681, 641**

37.5 54.2 96.6 100 9 631, 651**

FLA MCA MOCP†

Example: Supply voltage is 400-3-50.

AB = 393 v BC = 403 v AC = 396 v

Average Voltage =

Determine maximum deviation from average voltage. (AB) 397 − 393=4v

(BC) 403 − 397=6v (AC) 397 − 396=1v

Maximum deviation is 6 v. Determine % voltage imbalance.

% Voltage Imbalance = 100 x = 1.5% This amount of phase imbalance is satisfactory as it is below the

maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

POWER WIRING

FIG. NO.

= = 397

397

ELECTRIC HEAT

PART NO.

50DJ901—

393 + 403 + 396

1192

DISCONNECT MOUNTING LOCATION

Fig. 14 — Conduit Installation

EMT OR RIGID CONDUIT (FIELDSUPPLIED)

MAIN CONTROL BOX

BRACKET AND CONDUIT DRIP BOOT

CENTER POST

MANUAL RESET LIMIT SWITCH LOCATION (HIDDEN)

HEATER COVERS

15 to 23 m (51 to 75 ft), use no. 16 AWG insulated wire (35 C minimum). For over 23 m (75 ft), use no. 14 AWG insulated wire (35 C minimum). See Table 3 for wire conversions.

1. If unit is mounted on roof curb and accessory thru-thecurb service plate connection is used, route wire through connection plate.

2. Pass control wires through the hole provided on unit (see connection D, Connection Sizes table, Fig. 5).

3. Feed wire through the raceway built into the corner post to the 24-v barrier located on the left side of the control box. See Fig. 17. The raceway provides the UL (U.S.A. Standard) required clearance between high- and lowvoltage wiring.

4. Connect thermostat wires to screw terminals of lowvoltage connector. The connector plugs into the control board and may be removed to make connection. Plug connector back into the control board after making connection or unit will not operate.

HEAT ANTICIPATORSETTINGS — Set ﬁrst-stage heat anticipator settings at 1.0. Set second-stage heat anticipator settings at 0.6. For units with optional electric heat, set anticipator for second stage as shown in Table 4.

HEATER WIRING LABEL

HEATER MOUNTING BRACKET

SINGLE POINT BOX

SINGLE POINT BOX MOUNTING SCREWS

CONTROL WIRE TERMINAL BLOCK

HEATER MODULE (LOCATION 1)

HEATER MODULE (LOCATION 2)

Fig. 15 — Component Location

FIELD CONTROL WIRING — Install a Carrier-approved accessory thermostat assembly according to installation instructions included with the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature in accordance with thermostat installation instructions.

Route thermostat cable or equivalent single leads of colored wire from subbase terminals to low-voltage connections on unit (shown in Fig. 16) as described in Steps 1-4 below.

NOTE: For wire runs up to 15 m (50 ft), use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For

Table 3 — American/European Wire Conversions

AMERICAN EUROPEAN

Industry

Standard Size

18 AWG 0.82 1.0 16 AWG 1.30 1.5 14 AWG 2.08 2.5 12 AWG 3.30 4.0 10 AWG 5.25 6.0

8 AWG 6.36 10.0 6 AWG 13.29 16.0 4 AWG 21.14 25.0 3 AWG 26.65 — 2 AWG 33.61 35.0

1 AWG 42.39 50.0 1/0 AWG 53.49 — 2/0 AWG 67.42 70.0 3/0 AWG 85.00 95.0 4/0 AWG 107.19 120.0

250 kcmil 126.64 150.0 300 kcmil 151.97 — 350 kcmil 177.90 185.0 400 kcmil 202.63 240.0 500 kcmil 253.29 300.0 600 kcmil 303.95 —

LEGEND

AWG — American Wire Gage kcmil — Thousand Circular Mils

American

Conversion

(mm

)

Industry

Standard

Size (mm2)

Table 4 — Unit Voltage

220 400

Heater kW Anticipator Setting Part No. 50DJ901— Heater kW Anticipator Setting Part No. 50DJ901—

9.5 0.3 711 10.5 0.3 681

14.6 0.3 601 12.5 0.3 631

22.7 0.6 611 21.0 0.3 641

29.3 0.6 621 25.0 0.3 651

38.8 0.9 711, 621* 31.5 0.6 681, 641*

43.9 0.9 711, 621* 37.5 0.6 631, 651*

*Requires 2 heater packages.

UNIT CONTROL BOARD

BAT — Battery C—Contactor CB — Circuit Breaker DAT — Discharge-Air Thermistor EMC/EMFC — Energy Management Closed EMO/EMFO — Energy Management Open EQUIP — Equipment GND — Ground HR — Heater Relay IFC — Indoor-Fan Contactor

Fig. 16 — Field Wiring Connections

LEGEND

OFC — Outdoor-Fan Contactor P—Plug TB — Terminal Board TRAN — Transformer

Field Wiring Factory Wiring

Splice Connection (Factory Supplied)

Tables 5A and 5B show fan rps and rpm at motor pulley settings. Refer to Tables 6-13 to determine fan speed settings.

Fan motor pulleys are factory set for speed shown in Tables 1A and 1B.

RACEWAY

Fig. 17 — Field Control Wiring Raceway

Step 6 — Adjust Indoor-Fan Speed — Adjust in-

door fan speed to meet jobsite conditions.

For units with electric resistance heating, required minimum L/s (cfm) is 1062 (2250) for 50LJQ008 and 1416 (3000) or 50LJQ012, with the following exceptions.

UNIT

50LJQ

012

UNIT

VOLTAGE

220 50.0 400 50.0

HEATER

UNIT

CONFIG-

URATION

Horizontal or Vertical

REQUIRED

MINIMUM

L/s Cfm

1534 3250 1605 3400

To change fan speed: a. Shut off unit power supply. b. Loosen belt by loosening fan motor mounting nuts. See

Fig. 18.

c. Loosen movable pulley ﬂange setscrew (see Fig. 19). d. Screw movable ﬂange toward ﬁxed ﬂange to increase speed

and away from ﬁxed ﬂange to decrease speed. Increasing fan speed increases load on motor. Do not exceed maximum speed speciﬁed in Tables 1A and 1B.

e. Set movable ﬂange at nearest keyway of pulley hub and

tighten setscrew (see Tables 1A and 1B for speed change for each full turn of pulley ﬂange).

To align fan and motor pulleys: a. Loosen fan pulley setscrews. b. Slide fan pulley along fan shaft. c. Make angular alignment by loosening motor from mount-

ing plate.

To adjust belt tension (see Fig. 18): a. Loosen fan motor mounting bolts. b. Slide motor mounting plate away from fan scroll for proper

belt tension (13 mm [

⁄2-in.] deﬂection with one ﬁnger)

and tighten mounting bolts.

c. Adjust bolt and nut on motor mounting plate to secure

motor in ﬁxed position.

MOTOR MOUNTING NUTS AND BOLTS

Fig. 18 — Belt-Drive Motor Mounting

T able 5A — Fan R/s at Motor Pulley Settings (SI)

Fig. 19 — Indoor-Fan Pulley Adjustment

50LJQ

⁄

111⁄2221⁄2331⁄2441⁄25

MOTOR PULLEY TURNS OPEN

008 14.70 14.26 13.82 13.38 12.94 12.50 12.06 11.62 11.18 10.74 10.30 012 15.00 14.65 14.30 13.95 13.60 13.25 12.90 12.55 12.20 1 1.85 11.50

T able 5B — Fan Rpm at Motor Pulley Settings (English)

50LJQ

⁄

008 882 856 830 804 778 752 726 700 674 648 622 012 896 875 855 834 814 794 774 753 733 712 692

MOTOR PULLEY TURNS OPEN

⁄

221⁄2331⁄2441⁄25

Table 6 — Fan Performance (SI), 50LJQ008 (50 Hz) — Horizontal Discharge Units

AIRFLOW

(L/s) 1100 7.9 0.35 9.4 0.50 10.6 0.68 11.7 0.85 12.7 1.03 13.6 1.25 14.4 1.46 14.9 1.69 15.1 1.92 15.0 2.15

1200 8.3 0.42 9.8 0.59 11.0 0.78 12.0 0.95 13.0 1.15 13.9 1.36 14.8 1.58 15.5 1.82 16.0 2.06 16.4 2.31 1300 8.8 0.51 10.2 0.69 11.3 0.88 12.4 1.08 13.3 1.28 14.2 1.49 15.0 1.72 15.8 1.96 16.5 2.21 17.1 2.47 1400 9.2 0.60 10.6 0.80 11.7 0.99 12.7 1.22 13.7 1.42 14.5 1.63 15.3 1.87 16.1 2.12 16.9 2.38 — — 1500 9.7 0.71 11.0 0.91 12.1 1.12 13.0 1.35 14.0 1.59 14.8 1.81 15.6 2.04 16.4 2.30 — — — — 1600 10.1 0.82 11.3 1.04 12.5 1.28 13.4 1.49 14.3 1.75 15.2 2.00 15.9 2.24 — — — — — — 1700 10.6 0.93 11.8 1.20 12.9 1.44 13.8 1.67 14.7 1.92 15.5 2.20 — — — — — — — —

50 100 150 200 250 300 350 400 450 500

r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW

EXTERNAL STATIC PRESSURE (Pa)

Table 7 — Fan Performance (SI), 50LJQ012 (50 Hz) — Horizontal Discharge Units

AIRFLOW

(L/s) 1300 7.6 0.30 8.9 0.41 10.2 0.56 11.1 0.64 12.1 0.77 13.1 0.92 13.9 0.93 14.0 0.52 15.0 1.13 15.6 1.32

1400 8.0 0.40 9.3 0.51 10.5 0.64 11.4 0.75 12.4 0.88 13.3 1.01 14.1 1.11 14.6 0.96 15.4 1.32 16.0 1.42 1500 8.4 0.48 9.6 0.60 10.7 0.72 11.8 0.86 12.7 0.99 13.5 1.12 14.3 1.26 15.1 1.35 15.7 1.49 16.4 1.54 1600 8.8 0.58 10.0 0.69 11.1 0.82 12.1 0.96 12.9 1.10 13.8 1.24 14.5 1.38 15.3 1.54 16.0 1.64 16.7 1.72 1700 9.1 0.69 10.3 0.78 11.3 0.93 12.3 1.07 13.2 1.22 14.0 1.37 14.8 1.52 15.5 1.66 16.3 1.84 17.0 1.95 1800 9.5 0.81 10.7 0.90 11.7 1.05 12.6 1.20 13.5 1.36 14.3 1.52 15.0 1.67 15.8 1.83 16.4 1.99 17.2 2.17 1900 9.9 0.95 11.0 1.02 12.0 1.18 12.9 1.34 13.8 1.50 14.6 1.68 15.3 1.83 16.0 2.00 16.7 2.16 17.3 2.33 2000 10.3 1.11 11.4 1.17 12.3 1.32 13.2 1.48 14.1 1.66 14.9 1.83 15.6 2.01 16.3 2.18 17.0 2.36 17.6 2.53 2100 10.7 1.29 11.8 1.33 12.7 1.47 13.5 1.65 14.4 1.84 15.1 2.00 15.9 2.20 16.6 2.38 — — — — 2200 11.2 1.48 12.1 1.51 13.1 1.64 13.9 1.83 14.6 2.01 15.4 2.20 16.2 2.38 — — — — — — 2300 11.6 1.70 12.5 1.71 13.4 1.83 14.2 2.01 15.0 2.20 15.7 2.41 — — — — — — — —

50 100 150 200 250 300 350 400 450 500

r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW

EXTERNAL STATIC PRESSURE (Pa)

Table 8 — Fan Performance (SI), 50LJQ008 (50 Hz) — Vertical Discharge Units

AIRFLOW

(L/s) 1100 8.7 0.42 10.1 0.59 11.1 0.75 12.2 0.93 13.1 1.12 14.0 1.30 14.8 1.51 15.7 1.77 16.4 2.02 17.2 2.35

1200 9.3 0.52 10.5 0.69 11.6 0.87 12.6 1.05 13.5 1.26 14.3 1.46 15.1 1.66 15.9 1.88 16.7 2.14 17.4 2.44 1300 9.8 0.64 11.0 0.81 12.1 1.01 13.0 1.20 13.9 1.41 14.7 1.63 15.5 1.84 16.2 1.98 16.9 2.29 17.6 2.56 1400 10.4 0.77 11.5 0.94 12.6 1.16 13.5 1.37 14.3 1.58 15.1 1.80 15.9 2.04 16.6 2.27 17.3 2.51 — — 1500 11.0 0.92 12.0 1.10 13.0 1.33 13.9 1.56 14.7 1.78 15.5 2.00 16.3 2.25 17.0 2.50 — — — — 1600 11.6 1.08 12.6 1.28 13.5 1.50 14.4 1.76 15.2 2.00 16.0 2.23 16.7 2.47 — — — — — — 1700 12.2 1.26 13.1 1.48 14.0 1.70 14.9 1.97 15.7 2.23 16.4 2.48 — — — — — — — —

50 100 150 200 250 300 350 400 450 500

r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW

EXTERNAL STATIC PRESSURE (Pa)

Table 9 — Fan Performance (SI), 50LJQ012 (50 Hz) — Vertical Discharge Units

AIRFLOW

(L/s) 1300 8.4 0.37 9.6 0.51 10.8 0.61 11.7 0.69 12.6 0.81 13.3 0.90 14.3 1.05 15.1 1.27 15.9 1.48 16.7 1.67

1400 8.8 0.46 10.0 0.59 11.1 0.71 12.0 0.82 12.9 0.93 13.7 1.04 14.5 1.17 15.4 1.35 16.2 1.56 16.8 1.75 1500 9.2 0.55 10.4 0.68 11.5 0.81 12.4 0.94 13.2 1.06 14.0 1.19 14.8 1.26 15.6 1.44 16.4 1.62 17.1 1.83 1600 9.7 0.65 10.8 0.79 11.8 0.93 12.8 1.07 13.6 1.19 14.4 1.33 15.1 1.46 15.8 1.59 16.5 1.72 17.3 1.91 1700 10.2 0.75 11.2 0.91 12.2 1.06 13.1 1.20 13.9 1.34 14.7 1.48 15.4 1.63 16.1 1.76 16.7 1.89 17.4 2.04 1800 10.6 0.87 11.7 1.05 12.6 1.20 13.5 1.35 14.3 1.51 15.0 1.65 15.7 1.80 16.4 1.95 17.1 2.10 17.7 2.24 1900 11.1 1.01 12.1 1.19 13.0 1.35 13.9 1.52 14.7 1.68 15.4 1.84 16.1 1.99 16.8 2.14 17.4 2.31 18.0 2.46 2000 11.6 1.16 12.5 1.35 13.4 1.52 14.3 1.69 15.0 1.86 15.8 2.04 16.5 2.21 17.1 2.36 17.7 2.53 — — 2100 12.0 1.32 13.0 1.53 13.8 1.70 14.6 1.88 15.4 2.07 16.1 2.25 16.8 2.43 — — — — — — 2200 12.5 1.50 13.4 1.71 14.3 1.91 15.1 2.09 15.8 2.29 16.5 2.48 — — — — — — — — 2300 13.0 1.70 13.9 1.91 14.7 2.13 15.5 2.31 16.2 2.52 — — — — — — — — — —

r/s — Wheel Speed (Revolutions per Second) Bkw — Fan Shaft Power (kW)

NOTES:

1. Boldface indicates ﬁeld-supplied drive required.

2. indicates ﬁeld-supplied motor and drive required.

3. Maximumusableoutput power (BkW) on the 50LJQ008 unit is1.79

(2.40 Bhp) with standard 1.12 BkW (1.5 hp) motor. The maximum usable output power (BkW) increases to 2.16 (2.90 Bhp) on the 50LJQ012 unit with standard 1.5 BkW (2 hp) motor. Extensive

50 100 150 200 250 300 350 400 450 500

r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW

LEGEND

EXTERNAL STATIC PRESSURE (Pa)

motor and electrical testing on the Weathermaker I units ensures that the full power range of the motor can be utilized with conﬁdence. Using the fan motors up to the power ratings shown will not result in nuisance tripping orprematuremotor failure. Unit warranty will not be affected.

4. Use of ﬁeld-supplied motor may affect wire sizing. Contact Carrier representative to verify.

5. Values include losses for ﬁlters, unit casings and wet coils.

6. Motor drive range is 10.30 to 14.70 r/s (622 to 882 rpm) on the 50LJQ008and11.50to 15.00 r/s (692 to 896 rpm) on the 50LJQ012. All other r/s (rpms) will require a ﬁeld-supplied drive.

Table 10 — Fan Performance (English), 50LJQ008 (50 Hz) — Horizontal Discharge Units

AIRFLOW

(Cfm)

2200 459 0.42 549 0.62 625 0.83 691 1.06 753 1.31 805 1.58 842 1.87 857 2.16 851 2.45 823 2.70 2400 482 0.50 569 0.71 645 0.95 708 1.18 768 1.40 824 1.72 872 2.01 909 2.32 931 2.64 935 2.96 2600 507 0.59 592 0.82 663 1.08 727 1.32 784 1.58 839 1.87 891 2.17 936 2.49 973 2.82 999 3.16 2800 533 0.71 615 0.95 683 1.20 747 1.49 802 1.75 855 2.04 906 2.35 954 2.67 997 3.01 1034 3.36 3000 559 0.83 637 1.09 704 1.35 765 1.66 823 1.94 872 2.22 921 2.54 969 2.88 1014 3.22 — — 3200 585 0.96 660 1.24 727 1.52 785 1.83 841 2.15 892 2.45 939 2.76 984 3.10 ———— 3400 610 1.10 682 1.41 750 1.72 806 2.01 860 2.36 912 2.69 958 3.01 1002 3.34 ———— 3600 636 1.25 707 1.60 772 1.93 828 2.23 880 2.57 930 2.95 978 3.29 —————— 3800 661 1.41 733 1.82 795 2.15 852 2.48 901 2.80 949 3.20 — ———————

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp

EXTERNAL STATIC PRESSURE (in. wg)

Table 11 — Fan Performance (English), 50LJQ012 (50 Hz) — Horizontal Discharge Units

AIRFLOW

(Cfm)

3000 484 0.55 560 0.70 631 0.87 690 1.03 747 1.20 800 1.38 850 1.52 879 1.38 925 1.81 964 1.92 3200 505 0.66 579 0.81 646 0.98 708 1.16 761 1.34 812 1.51 862 1.71 908 1.85 944 2.01 984 2.09 3400 527 0.78 599 0.93 664 1.11 724 1.30 775 1.48 827 1.67 873 1.85 920 2.07 963 2.21 1001 2.31 3600 548 0.92 619 1.05 680 1.24 738 1.43 794 1.64 840 1.83 888 2.04 931 2.23 976 2.47 1017 2.62 3800 571 1.08 639 1.19 698 1.39 756 1.60 810 1.81 856 2.02 901 2.23 945 2.44 986 2.65 1029 2.89 4000 593 1.25 659 1.35 717 1.56 773 1.78 823 1.98 875 2.22 915 2.42 960 2.65 1000 2.87 1039 3.10 4200 616 1.45 680 1.53 737 1.74 789 1.95 841 2.18 889 2.41 934 2.65 972 2.87 1015 3.12 1053 3.34 4400 639 1.67 701 1.73 757 1.92 807 2.16 858 2.41 903 2.62 951 2.89 990 3.12 1028 3.36 — — 4600 662 1.91 722 1.95 777 2.13 827 2.38 874 2.62 921 2.87 965 3.11 1008 3.39 ———— 4800 686 2.17 744 2.20 797 2.36 846 2.62 891 2.85 938 3.14 980 3.37 —————— 5000 710 2.45 766 2.47 816 2.61 866 2.86 910 3.12 934 3.39 — ———————

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp

EXTERNAL STATIC PRESSURE (in. wg)

Table 12 — Fan Performance (English), 50LJQ008 (50 Hz) — Vertical Discharge Units

AIRFLOW

(Cfm)

2200 503 0.50 585 0.71 653 0.92 716 1.15 772 1.38 824 1.63 884 1.95 934 2.30 916 2.64 1019 3.09 2400 534 0.61 613 0.84 677 1.06 738 1.30 794 1.55 844 1.81 892 2.08 944 2.40 987 2.76 1039 3.20 2600 565 0.74 639 0.97 703 1.20 761 1.46 816 1.74 866 2.01 913 2.29 957 2.58 1004 2.91 1050 3.31 2800 597 0.89 665 1.12 731 1.40 786 1.66 839 1.93 889 2.23 935 2.52 978 2.62 1019 3.13 1061 3.47 3000 629 1.06 694 1.29 759 1.59 812 1.88 862 2.15 911 2.46 957 2.78 1000 3.09 1040 3.41 — — 3200 662 1.25 724 1.50 785 1.80 840 2.11 887 2.41 934 2.71 980 3.04 1022 3.38 ———— 3400 696 1.46 756 1.73 811 2.02 868 2.37 914 2.69 959 3.00 1003 3.32 —————— 3600 729 1.69 787 1.98 839 2.27 894 2.64 942 2.99 984 3.32 ———————— 3800 763 1.95 819 2.27 869 2.56 920 2.92 970 3.31 — —————————

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp

EXTERNAL STATIC PRESSURE (in. wg)

Table 13 — Fan Performance (English), 50LJQ012 (50 Hz) — Vertical Discharge Units

AIRFLOW

(Cfm)

3000 532 0.64 605 0.81 670 0.97 725 1.12 778 1.28 825 1.43 874 1.60 926 1.82 974 2.11 1012 2.36 3200 557 0.75 628 0.93 690 1.10 746 1.28 796 1.44 844 1.61 888 1.70 934 1.94 988 2.18 1025 2.47 3400 583 0.88 651 1.06 711 1.25 767 1.44 815 1.61 863 1.79 907 1.97 947 2.14 991 2.32 1038 2.57 3600 609 1.01 674 1.22 732 1.42 787 1.61 836 1.80 880 1.98 926 2.18 966 2.36 1004 2.54 1045 2.74 3800 535 1.16 698 1.39 755 1.59 808 1.80 857 2.01 901 2.20 943 2.39 985 2.60 1023 2.79 1059 2.98 4000 662 1.33 722 1.57 778 1.78 829 2.01 878 2.22 922 2.44 962 2.63 1003 2.84 1042 3.06 1078 3.26 4200 689 1.52 746 1.77 801 1.99 851 2.23 898 2.45 943 2.69 983 2.91 1021 3.11 1060 3.34 — — 4400 715 1.72 772 1.99 825 2.22 873 2.46 919 2.71 963 2.94 1004 3.19 1042 3.41 ———— 4600 742 1.94 797 2.22 848 2.48 896 2.72 940 2.98 984 3.22 1025 3.48 —————— 4800 770 2.18 823 2.46 872 2.75 919 3.00 963 3.27 — ————————— 5000 797 2.44 849 2.73 897 3.04 943 3.30 ————————————

Rpm — Wheel Speed (Revolutions per Minute) Bhp — Fan Shaft Power (Brake Horsepower)

NOTES:

1. Boldface indicates ﬁeld-supplied drive required.

2. indicates ﬁeld-supplied motor and drive required.

3. Maximumusable output power (Bhp) on the50LJQ008 unit is 2.40 (1.79 BkW) with standard 1.5hp (1.12 BkW) motor. The maximum usable output power (Bhp) increases to 2.90 Bhp (2.16 BkW) on the 50LJQ012 unit with standard 2 hp (1.5 BkW) motor.

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp

LEGEND

EXTERNAL STATIC PRESSURE (in. wg)

Extensive motor and electrical testing ontheWeathermakerI units ensures that the full power range of the motor can be utilized with conﬁdence. Using the fan motors up to the power ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

4. Use of ﬁeld-supplied motor may affect wire sizing. Contact Carrier representative to verify.

5. Values include losses for ﬁlters, unit casings, and wet coils.

6. Motor drive range is 622 to 882 rpm (10.30 to 14.70 r/s) on the 50LJQ008and692to896rpm (11.50to 15.00 r/s) on the 50LJQ012. All other rpms (r/s) will require a ﬁeld-supplied drive.

START-UP

IMPORTANT:Energizecrankcase heaters 24 hours prior to base unit start-up to remove entrapped refrigerant from the oil. Heaters are energized as long as there is power to the unit.

Unit Preparation — Make sure that unit has been in-

stalled in accordance with these installation instructions and applicable codes.

Return-Air Filters — Make sure correct ﬁlters are in-

stalled in unit (see Tables 1A and 1B). Do not operate unit without return-air ﬁlters.

Compressor Mounting — Compressors are inter-

nally spring mounted. Do not loosen or remove compressor holddown bolts.

Internal Wiring — Check all electrical connections in

unit control boxes; tighten as required.

Refrigerant Service Ports — Each refrigerant sys-

tem has 3 Schrader-type service gage ports: one on the suction line, one on the liquid line and one on the compressor discharge line. Be sure that caps on the ports are tight.

Cooling — To start unit, turn on main power supply. Set

system selector switch at COOL position and fan switch at AUTO. position. Adjust thermostat to a setting below room temperature. Compressor starts on closure of contactor.

Check unit charge. Refer to Refrigerant Charge section on

page 20.

Reset thermostat at a position above room temperature.

Compressor will shut off. TO SHUT OFF UNIT — Set system selector switch at OFF

position. Resetting thermostat at a position above room temperature shuts unit off temporarily until space temperature exceeds thermostat setting.

Heating — To start unit, turn on main power supply.

Set thermostat at HEATposition and a setting above room

temperature, fan at AUTO. position.

First stage of thermostat energizes Compressor no. 1 and Compressor no. 2; second stage energizes the electric heat (where applicable). Check heating effectsat air supply grille(s).

If unit does not energize, reset limit switch (located on indoor-fan scroll) by depressing button located between terminals on the switch.

TO SHUT OFF UNIT — Set system selector switch at OFF position. Resetting heating selector lever below room temperature will shut unit off temporarily until the space temperature falls below thermostat setting.

Safety Relief — A soft-solder joint at the suction line

ﬁtting provides pressure relief under abnormal temperature and pressure conditions.

Ventilation (Continuous Fan) — Set fan and sys-

tem selector switches at ON and OFF positions, respectively. Indoor fan operates continuously to provide constant air circulation.

Operating Sequence (See Fig. 20)

COOLING — With accessory economizer — Upon a re- quest for cooling from the space thermostat, terminals Y1 and G will be energized with 24 v.As a result, the indoor-fan contactor (IFC), indoor-fan motor (IFM), and reversing valve solenoids (RVS1 and RVS2) will be energized and the

economizer damper blade will open to minimum position. Note that if the indoor fan is on when the space thermostat calls for cooling, terminal G is already energized and the economizer damper blade is at minimum position.

If the outdoor-air temperature is below the outdoor-airthermostat (OAT) setting, then the position of the damper blade will be determined by the temperature of the discharge air as sensed by the discharge-air thermistor (DAT). The damper blade will slide open for 5 seconds, and rest for 30 seconds until the proper discharge-air temperature is obtained. The damper blade will modulate to different positions to maintain this discharge-air temperature.

If the thermostat calls for a second stage of cooling by supplying 24 v to Y2, the outdoor-fan contactor (OFC) and Compressor contactor no. 1 (C1) will be energized, which will bring on the outdoor fan and Compressor no. 1, respectively.

When the thermostat is satisﬁed, Y2 will be deenergized ﬁrst, which will deenergize the outdoor fan and Compressor no. 1. When the indoor fan is deenergized, the economizer will return to a fully closed position.

If the outdoor-air temperature is above the OAT setting, the economizer will move to the minimum position and the unit will operate as described in Cooling, Units Without Accessory Economizer section below.

Without accessory economizer — Upon a request for cooling from the space thermostat, terminals Y1 and G will be energized with 24 v. As a result, the indoor-fan contactor (IFC), outdoor-fan contactor (OFC) and Compressor contactor no. 1 (C1) will be energized, which in turn will energize the indoor fan, outdoor fan and Compressor no. 1, respectively.

If the space thermostat calls for a second stage of cooling by supplying 24 v to Y2, Compressor contactor no. 2 (C2) will be energized, thus energizing Compressor no. 2.

When the space thermostat is satisﬁed, Y2 will be deenergized ﬁrst, which will deenergize Compressor no. 2.

Upon a further drop in space temperature, Y1 will be deenergized which will deenergize Compressor no. 1, and the outdoor and indoor fans.

HEATING — Upon a request for heating from the space thermostat, terminal W1 will be energized with 24 v. On units with economizer, the economizer damper blade will move to minimum position regardless of the outdoor-air temperature, and the unit will operate as described in Cooling, Without Accessory Economizer section above. The IFC, OFC, C1 and C2 will be energized. The reversing valves switch position and the indoor fan, outdoor fan, Compressor no. 1, and Compressor no. 2 are energized.

If the space temperature continues to fall while W1 is energized, W2 will be energized with 24 v, and the heater contactor(s) (HC) willbe energized, which will energize the electric heater(s).

When the space thermostat is satisﬁed, W2 will be deenergized ﬁrst, and the electric heater(s) will be deenergized.

Upon a further rise in space temperature, W1 will be deenergized,and the reversing valve solenoids (RVS1and RVS2) will be energized. On units with economizer, the economizer damper blade will move to the fully closed position.

DEFROST — When the temperature of the outdoor coil drops below 28 F as sensed by the defrost thermostat (DFT2) and the defrost timer is at the end of a timed period (adjustable at 30, 50 or 90 minutes). RVS1 and RVS2 are energized and the OFC is deenergized. This switches the

NOTES:

1. In heating mode, economizer damper blade will move to the minimum position, and unit will operate as described for units without economizer, regardless of outdoor air temperature.

2. The temperatures given in the graph are for demonstration purposes only and may vary depending on which thermostat is used.

LEGEND

C—Contactor HC — Heater Contactor IFC — Indoor-Fan Contactor OAT — Outdoor-Air Thermostat OFC — Outdoor-Fan Contactor RVS — Reversing Valve Solenoid W—Heating Stage X—Contact Energized Y—Cooling Stage

UNITS WITH ECONOMIZER

AVERAGE OUTDOOR-AIR TEMPERATURE GREATER THAN OAT SETTING

Thermostat Demand G Y1 Y2 W1 W2 C1 C2 IFC OFC RVS1 RVS2 HC Second Stage Cooling XX X X X X X X X

First Stage Cooling XX X X X X X Deadband (Offset) First Stage Heating XXXX Second Stage Heating XXXXX X

AVERAGE OUTDOOR-AIR TEMPERATURE LESS THAN OAT SETTING, BUT GREATER THAN −2 C (28 F)

Thermostat Demand G Y1 Y2 W1 W2 C1 C2 IFC OFC RVSI RVS2 HC Second Stage Cooling XXX X X X X X

First Stage Cooling XX X X X Deadband(Offset) First Stage Heating XXXX Second Stage Heating XXXXX X

UNITS WITHOUT ECONOMIZER

AVERAGE OUTDOOR-COIL TEMPERATURE LESS THAN −2C (28 F)

Thermostat Demand G Y1 Y2 W1 W2 C1 C2 IFC OFC RVSI RVS2 HC Second Stage Cooling XX X X X X X X X

First Stage Cooling XX X X X X X Deadband (Offset) First Stage Heating XXXX Second Stage Heating XXXXX X

AVERAGE OUTDOOR-COIL TEMPERATURE GREATER THAN −2 C (28 F)

Thermostat Demand G Y1 Y2 W1 W2 C1 C2 IFC OFC RVSI RVS2 HC Second Stage Cooling XX X X X X X X X

First Stage Cooling XX X X X X X Deadband (Offset) First Stage Heating XXXX Second Stage Heating XXXXX X

Fig. 20 — Typical Operating Sequence

position of the reversing valves and shuts off the outdoor fan. The electric heaters (if installed) will be energized. On units with economizer,the economizer damperblade will move to the fully closed position.

The unit continues to defrost until the coil temperature as measured by DFT2 reaches 65 F or the duration of defrost cycle completes a 10-minute period.

During the defrost mode, if circuit 1 defrosts ﬁrst, RVS1 will oscillate between heating and cooling modes until the defrost mode is complete.

At the end of the defrost cycle, the electric heaters (if installed) will be deenergized; the reversing valves switch and the outdoor-fan motor will be energized. On units with economizer, the economizer damper blade will move to the minimum position. The unit will now operate in the heating mode.

If the space thermostat is satisﬁed during a defrost cycle, the unit will continue in the defrost mode until the time or temperature constraints are satisﬁed.

SERVICE

When servicing unit, shut off all electrical power to unit to avoid shock hazard or injury from rotating parts.

Cleaning — Inspect unit interior at the beginning of each

heating and cooling season and as operating conditions require.

Fig. 21 — Cleaning Outdoor Coil

INDOOR COIL

1. Turn unit power off. Remove indoor coil access panel.

2. If accessory economizer is installed, remove economizer

by disconnecting Molex plug and removing economizer mounting screws. Refer to Accessory Economizer Installation Instructions for more details.

3. Slide ﬁlters out of unit.

4. Clean coil using a commercial coil cleaner or dishwasher

detergent in a pressurized spray canister.Washboth sides of coil and ﬂush with clean water. For best results, backﬂush toward return-air section to remove foreign material.

5. Flush condensate pan after completion.

6. Reinstall economizer and ﬁlters.

7. Reconnect wiring.

8. Replace access panels. OUTDOOR COIL — Inspect coil monthly. Clean outdoor

coil annually, and as required by location and outdoor air conditions.

2-Row Coils— Clean coil as follows:

1. Turn off unit power.

2. Remove top panel screws on outdoor-coil end of unit.

3. Remove outdoor-coil corner post. See Fig. 21. To hold

top panel open, place coil corner post between top panel and center post. See Fig. 22.

4. Remove device holding coil sections together at return

end of outdoor coil. Carefully separate the outer coil section 75 to 100 mm (3 to 4 in.) from the inner section. See Fig. 23.

5. Use a water hose or other suitable equipment to ﬂush down

between the 2 coil sections to remove dirt and debris. Clean the outer surfaces with a stiff brush in the normal manner.

Fig. 22 — Propping Up Top Panel

Fig. 23 — Separating Coil Sections

6. Reposition the outer coil panel section and remove the coil corner post from between the top panel and center post. Secure the sections together.

7. Install the coil corner post, coil center post and replace all screws.

CONDENSATE DRAIN — Check and clean each year at start of cooling season. In winter, keep drain dry or protect against freeze-up.

FILTERS — Clean or replace at start of each heating and cooling season, or more often if operating conditions require it. Replacement ﬁlters must be same dimensions as original ﬁlters.

OUTDOOR-AIR INLET SCREENS — Clean screens with steam or hot water and a mild detergent. Do not use disposable ﬁlters in place of screens.

Lubrication

COMPRESSORS — Each compressor is charged with correct amount of oil at the factory.

FAN-MOTOR BEARINGS — Fan motor bearings are of

the permanently-lubricated type. No further lubrication is required. No lubrication of outdoor- or indoor-fan motors is

required.

Outdoor-Fan Adjustment (Fig. 24)

Refrigerant Charge — Amount of refrigerant charge

is listed on the unit nameplate (also refer to Tables 1A and 1B). Refer to Carrier Standard Service Techniques Manual, Chapter 1, Refrigerants section.

Unit panels must be in place when unit is operating dur-

ing charging procedure. LOW CHARGE HEATING OR NO CHARGE — Use stand-

ard evacuating techniques. After evacuating system, weigh in the speciﬁed amount of refrigerant (refer to Tables 1A and 1B).

LOW CHARGE COOLING — Use Cooling Charging Chart, Fig. 25 and 26. Vary refrigerant until the conditions of the chart are met. Note the charging chart is different from type normally used. Chart is based on charging the units to the correct superheat for the various operating conditions. Accurate pressure gage and temperature sensing device are required. Connect the pressure gage to the service port on the suction line. Mount the temperature sensing device on the suction line and insulate is so that outdoor ambient temperature does not affect the reading. Indoor-air L/s (cfm) must be within the normal operating range of the unit.

TO USE COOLING CHARGING CHART— Take the outdoor ambient temperature and read the suction pressure gage. Refer to chart to determine what suction temperature should be. If suction temperature is high, add refrigerant. If suction temperature is low, carefully blow some of the charge. Recheck the suction pressure as charge is adjusted.

Example: (Fig. 26) (Circuit 1)

Outdoor Temperature ....................29C(85F)

Suction Pressure ...................483kPa(70psig)

Suction Temperature should be .............7C(46F)

(Suction Temperature may vary ± 3° C (5° F)

Fig.24 — Outdoor-Fan Adjustment

1. Shut off unit power supply.

2. Remove outdoor-fan assembly (grille, motor,motor cover and fan) and loosen fan hub setscrews.

3. Adjust fan height as shown in Fig. 24.

4. Tighten setscrews and replace outdoor-fan assembly.

If Chargemastert charging device is used, temperature and pressure readings must be accomplished using the charging chart.