Carrier 38HDF018-036, 38HDR018-060 User Manual

Download

Installation, Start-Up and

Service Instructions

CONTENTS

Page

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

INSTALLATION ................................ 1-10

Step 1 — Complete Pre-Installation Checks ......1

• UNPACK UNIT

• INSPECT SHIPMENT

• CONSIDER SYSTEM REQUIREMENTS

• MATCHING THE CONDENSING UNIT TO AN INDOOR UNIT

Step 2 — Rig and Mount Unit..................... 3

• MOUNTING ON GROUND

• MOUNTING ON ROOF

• RIGGING

Step 3 — Complete Refrigerant Piping

Connections ................................... 3

• CHECK ACCURATER CONTROL

• FILTER DRIER

• MAKE PIPING SWEAT CONNECTORS

• PROVIDE SAFETY RELIEF

Step 4 — Make Electrical Connections ...........6

• CONTROL CIRCUIT WIRING

• POWER WIRING

• CONNECTIONS TO DUCT-FREE FAN COIL UNITS

START-UP ....................................... 11

SERVICE ..................................... 11-14

MAINTENANCE ................................. 14

TROUBLESHOOTING..........................14,15

38HDF018-036

Duct Free Condensing Units

38HDR018-060

Ducted Condensing Units

Puron® (R-410A) refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on Puron refrigerant equipment. If service equipment is not rated for Puron refrigerant, equipment damage or personal injury may result.

INSTALLATION

Step 1 — Complete Pre-Installation Checks

UNPACK UNIT (See Fig. 1) — Move the unit to final location. Remove unit from carton, being careful not to damage service valves and grilles.

SAFETY CONSIDERATIONS

Installing and servicing air conditioning equipment can be

hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install or service air conditioning equipment.

Untrained personnel can perform basic maintenance, such

as cleaning and replacing filters. All other operations should be performed by trained service personnel. When working on air conditioning equipment, observe safety precautions in literature, tags, and labels attached to unit.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly. Consult local building codes and the National Electrical Code (NEC) for special installation requirements.

Before installing or servicing system, always turn off main power to system. There may be more than one disconnect switch. Turn off accessory heater power if applicable. Electrical shock can cause serious personal injury.

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

Book 1 4 Ta b 3 e 2 f

Catalog No. 02-38HD0001-SI Printed in U.S.A. Form 38HD-4SI Pg 1 1-06 Replaces: 38HDC-3SI

INSPECT SHIPMENT — File a claim with the shipping company if shipment is damaged or incomplete. Check unit nameplate to ensure unit matches job requirements.

CONSIDER SYSTEM REQUIREMENTS — Consult local building codes and NEC for special installation requirements.

Allow sufficient space for airflow clearance, wiring, refrig-

erant piping, and servicing unit. See Fig. 2.

Locate unit so that condenser airflow is unrestricted on both

sides. Refer to Fig. 2.

Unit may be mounted on a level pad directly on base legs or mounted on raised pads at support points. See Fig. 2 for center of gravity.

MATCHING THE CONDENSING UNIT TO AN INDOOR UNIT — The 38HDF,HDR units can be matched to a corresponding indoor unit. The 38HDF018-036 units can be matched with an in-ceiling cassette or high wall indoor unit. The 38HDR unit can be matched with under-ceiling and residential fan coils. Refer to separate indoor unit literature for more information.

Fig. 1 — 38HDF,HDR Unit

Support Feet

15.88 166 75.3

15.88 176 79.8

19.05 187 84.8

19.05 250 113.4

15.88 166 75.8

15.88 176 79.8

19.05 187 84.8

19.05 250 113.4

22.22 278 126.1

030

036

048

22.22 306 138.8

060

M OPERATING WT

030

036

018

024

in. mm lb kg

018

024

DIMENSIONS

MINIMUM MOUNTING PAD

ft-in. mm

UNIT SIZE

38HDF

38HDR

UNIT SIZE

CHASSIS SIZES 0 & .6 1′-11″ x3′-6″ 584.2 x 1066.8

CHASSIS SIZES 1 & 1.6 2′-0″ x4′-2″ 609.6 x 1270

on coil side and coil end, and 3 feet minimum clearance on compressor

end and fan side. With fan facing wall, allow 8 in. minimum clearance on

fan side and coil end, and 3 feet minimum clearance on compressor end

and coil side. With multi-unit application, arrange units so discharge of one

″

″ 0′-6″

″ 0′-6

″ 0′-2

″ 0′-11

″ 0′-6

″ 0′-3

″ 1′-3

″ 1′-6

″ 0′-8

NOTES:

1. Required clearances: with coil facing wall, allow 6 in. minimum clearance

does not enter inlet of another.

2. Dimensions in parenthesis are in millimeters.

3. Center of Gravity .

ABCD E FG H J KL NP

SIZE

CHASSIS

(Reference)

″ 1′-1

″ 1′-2

″ 2′-4″ 1′-2″ 0′-6

″ 1′-10″ 1′-1″ 0′-6

″ 1′-5

″ 1′-11

″ 1′-5

″ 1′-4″ 1′-11

″ 1′-2

″ 3′-0

2′-1

2′-7

(638.2) (938.2) (369.9) (406.4) (595.3) (436.6) (435) (559.1) (330.2) (168.3) (285.8) (75) (152.4)

″ 3′-4

″ 2′-10

″ 2′-5

″ 2′-1

″ 1′-7

″ 2′-6

″ 1′-6

″ 1′-5

″ 3′-8

(790.6) (938.2) (369.9) (406.4) (595.3) (436.6) (587.4) (711.5) (355.6) (171.5) (295.3) (75) (152.4)

(1097) (1131.9) (433.4) (468.3) (774.7) (498.5) (893.4) (1017.9) (354.2) (215.9) (479.4) (88) (165.4)

(944.6) (1131.9) (433.4) (468.3) (774.7) (498.5) (741) (865.5) (347.7) (206.4) (403.2) (88) (165.4)

3′-1

3′-7

(FIELD PROVIDED AND INSTALLED)

Fig. 2 — 38HDF,HDR Unit Dimensions

38HDR

Unit Size

UNIT MODELS

018 018 0

38HDF

Unit Size

024,030 024 0.6

— 048,060 1.6

036 030,036 1.0

NOTE: Dimensions shown in feet-inches. Dimensions in ( ) are millimeters.

Step 2 — Rig and Mount Unit

MOUNTING ON GROUND — Mount unit on a solid, level concrete pad. Position unit so water or ice from roof does not fall directly onto unit. Accessory stacking kits can be used when units are to be stacked. See installation instructions provided with the accessory kit. Use field-provided snow stand or ice rack where prolonged subfreezing temperatures or heavy snow occurs.

If conditions or local codes require unit be fastened to a pad, 6 field-supplied tiedown bolts should be used and fastened through slots provided in unit mounting feet.

MOUNTING ON ROOF — Mount unit on a level platform or frame at least 6 in. above roof surface. Isolate unit and tubing from structure.

RIGGING

Be sure unit panels are securely in place prior to rigging. Loose unit panels could result in equipment damage or personal injury.

Keep the unit upright and lift unit using a sling. Use cardboard or padding under the sling, and spreader bars to prevent sling damage to the unit. See Fig. 3. See Fig. 2 for center of gravity reference. Install the unit so that the coil does not face into prevailing winds. If this is not possible and constant winds above 25 mph are expected, use accessory wind baffle. See installation instructions provided with the accessory kit.

NOTE: Accessory wind baffles should be used on all units with accessory low ambient temperature control.

Field-fabricated snow or ice stands may be used to raise unit when operation will be required during winter months. Units may also be wall mounted using the accessory wall-mounting kit.

When more than 50 ft of interconnecting tubing and more than 30 ft of vertical lift is used, consult the residential long line application instruction guide. For long-line applications, interconnecting lines over 100 ft must be installed with a liquid line solenoid. A liquid line solenoid may also be installed on some units to improve part-load efficiency. Refer to the ARI (Air Conditioning & Refrigeration Institute) Directory.

If either refrigerant tubing or indoor coil is exposed to the atmosphere, the system must be evacuated following good refrigeration practices.

Run refrigerant tubes as directly as possible, avoiding unnecessary turns and bends. Suspend refrigerant tubes so they do not damage insulation on vapor tube and do not transmit vibration to structure. Also, when passing refrigerant tubes through a wall, seal the opening so that vibration is not transmitted to structure. Leave some slack in refrigerant tubes between structure and outdoor unit to absorb vibration. Refer to separate indoor unit installation instructions for additional information.

CHECK ACCURATER CONTROL — The correct AccuRater (bypass type) refrigerant control is required for system capacity optimization. An AccuRater device with fieldreplaceable piston (see Fig. 4) is supplied with the outdoor unit. Refer to the AccuRater metering device table in separate indoor unit installation instructions to determine the correct AccuRater piston size required for the condenser/evaporator system being installed.

Piston style as shown in Fig. 4 is shipped with the unit. Do not interchange components between the AccuRater device types. Matching of outdoor unit with indoor unit may require field replacement of piston. Replace piston, if required, before connecting refrigerant lines. See Fig. 4. Piston replacement instructions are included in the indoor unit installation instructions. After system installation is complete, see the Refrigerant Charging section on page 12 to check and/or adjust refrigerant charge.

FILTER DRIER — The filter drier must be replaced whenever the refrigeration system is exposed to the atmosphere. See Fig. 4 for filter drier installation.

Fig. 3 — Lifting Unit with Sling

Step 3 — Complete Refrigerant Piping Connections —

units using field-supplied tubing of refrigerant grade and condition. See Tables 1A and 1B for correct line sizes. Do not use less than 10 ft of interconnecting tubing.

DO NOT BURY MORE THAN 36 IN. OF REFRIGERANT PIPE IN THE GROUND. If any section of pipe is buried, there must be a 6-in. vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried refrigerant may migrate to cooler, buried section during extended periods of system shutdown. This causes refrigerant slugging and could possibly damage the compressor at start-up.

Outdoor units may be connected to indoor

NOTE: Arrow on AccuRater body points in free flow direction, away from the indoor coil.

38HDF018-036

38HDR018-060

Fig. 4 — AccuRater (Bypass Type) Metering

Device Components

Only use factory specified liquid-line filter driers with rated

working pressures less than 600 psig. NOTE: Do not install a suction-line filter drier in liquid line. MAKE PIPING SWEAT CONNECTIONS — Remove plastic

To avoid damage while brazing, service valves should be wrapped with a heat-sinking material such as a wet cloth.

caps from liquid and suction service valves. Use refrigerant grade tubing. Service valves are closed from the factory and are ready for brazing. After wrapping the service valve with a wet cloth, the tubing set can be brazed to the service valve using either silver bearing or non-silver bearing brazing material. Consult local code requirements. Refrigerant tubing and the indoor coil are now ready for leak testing.

When brazing tubing sets to the service valves, a brazing shield MUST be used to prevent damage to the painted unit surface.

NOTE: Unit is shipped with R-410A factory charge indicated on nameplate.

Pass nitrogen or other inert gas through piping while braz-

ing to prevent formation of copper oxide.

PROVIDE SAFETY RELIEF — A fusible plug is located in unit suction line; do not cap this plug. If local code requires additional safety devices, install as directed.

Table 1A — 38HDF018-036 Physical Data

UNIT 38HDF 018 024 030 036 NOMINAL CAPACITY (Tons) 1.5 2.0 2.50 3.0 OPERATING WEIGHT (lb) 166 176 187 250 REFRIGERANT TYPE R-410A METERING DEVICE AccuRater (Located at Fan Coil) CHARGE (lb)* 4.8 5.3 5.0 7.1 OUTDOOR FAN

Rpm/Cfm 840/1720 840/1720 840/1720 850/1720 Diameter (in.) 18 18 18 24 No. Blades 333 3 Motor (hp)

OUTDOOR COIL

Face Area (sq ft) 5.82 7.27 7.27 12.1 No. Rows 233 2 FPI 20 20 20 20

HIGH PRESSURE SWITCH

Cut-In (psig) 420 ± 25 420 ± 25 420 ± 25 420 ± 25 Cutout (psig) 650 ± 10 650 ± 10 650 ± 10 650 ± 10

LOW PRESSURE SWITCH

Cut-In (psig) 45 ± 25 45 ± 25 45 ± 25 45 ± 25 Cutout (psig) 20 ± 5 20 ± 5 20 ± 5 20 ± 5

REFRIGERANT LINES

Connection Type Sweat Liquid Line (in.) OD Vapor Line (in.) OD Max Length (ft) 200 200 200 200 Max Lift (ft) 65 65 65 65

Max Drop (ft) 150 150 150 150

COMPRESSOR

Type Scroll Model ZP16K5E-PFV ZP21K5E-PFV ZP25K5E-PFV ZP34K5P-PFV Oil Charge (POE - oz) 25.0 25.0 25.0 42.0 Accumulator Ye s

CONTROLS

Fusible Plug (F) 210 Control Voltage† 24 vac

System Voltage 208/230 v 208/230 v 208/230 v

FINISH Gray

LEGEND *Unit shipped with full factory charge. See ARI (Air Conditioning and

FPI — Fins Per Inch POE — Polyol E st er

208/230 v, Single and 3 Phase,

460 v, 3 Phase

Refrigeration Institute) capacity table for proper charge and piston for each fan coil type.

†24 v and a minimum of 40 va is provided in the fan coil unit.

Table 1B — 38HDR018-060 Physical Data

UNIT 38HDR 018 024 030 036 048 060 NOMINAL CAPACITY (Tons) 1.5 2.0 2.50 3.0 4.0 5.0 OPERATING WEIGHT (lb) 166 176 250 250 278 306 REFRIGERANT TYPE R-410A METERING DEVICE AccuRater (Located at Fan Coil) CHARGE (lb)* 6.3 6.5 10.0 8.9 12.0 12.2 OUTDOOR FAN

Rpm/Cfm 840/1720 840/1720 850/3900 850/3900 850/3900 850/3900 Diameter (in.) 18 18 24 18 24 24 No. Blades 333333 Motor (hp)

OUTDOOR COIL

Face Area (sq ft) 5.8 7.3 12.1 12.1 14.1 14.1 No. Rows 232233 FPI 20 20 20 20 20 20

HIGH PRESSURE SWITCH

Cut-In (psig) 420 ± 25 420 ± 25 420 ± 25 420 ± 25 420 ± 25 420 ± 25 Cutout (psig) 650 ± 10 650 ± 10 650 ± 10 650 ± 10 650 ± 10 650 ± 10

LOW PRESSURE SWITCH

Cut-In (psig) 45 ± 25 45 ± 25 45 ± 25 45 ± 25 45 ± 25 45 ± 25 Cutout (psig) 20 ± 5 20 ± 5 20 ± 5 20 ± 5 20 ± 5 20 ± 5

REFRIGERANT LINES

Connection Type Sweat Liquid Line (in.) OD Vapor Line (in.) OD Max Length (ft) 200 200 200 200 200 200

Max Lift (ft) 65 65 65 65 65 65 Max Drop (ft) 150 150 150 150 150 150

COMPRESSOR

Type Scroll Model ZP16K5E-PFV ZP21K5E-PFV ZP25K5E-PFV ZPZ9K5E-PFV ZP42K5E-PFV ZP51K5E-PFV Oil Charge (POE - oz) 25.0 25.0 25.0 25.0 42.0 42.0

Crankcase Heater (watts) — — 40 40 40 40

Accumulator Ye s

CONTROLS

Fusible Plug (F) 210 Control Voltage** 24 vac System Voltage 208/230 v 208/230 v 208/230 v 208/230 v, Single and 3 Phase, 460 v, 3 Phase

FINISH Gray

LEGEND *Unit shipped with full factory charge. See ARI (Air Conditioning

FPI — Fins Per Inch POE — Polyol E st er

/8†

and Refrigeration Institute) capacity table for proper charge and piston for each fan coil type.

†Valve connection size is

11/8inches.

/8inch. Recommended line size is

**24 v and a minimum of 40 va is provided in the fan coil unit.

Step 4 — Make Electrical Connections

Unit cabinet must have an 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 NEC, and local electrical codes. Failure to follow this warning could result in the installer being liable for the personal injury of others.

Unit failure as a result of 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.

Before performing service or maintenance, be sure indoor unit main power switch is turned OFF and indoor blower has stopped. Failure to do so may result in electrical shock or injury from rotating fan blades.

CONTROL CIRCUIT WIRING — Control voltage is 24 v (40 va minimum). See Fig. 5 and unit label diagram for fieldsupplied wiring details. Route control wire through opening in unit side panel to connection in unit control box.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire. For 50 to 75 ft, use no. 16 AWG insulated wire. For over 75 ft, use 14 AWG insulated wire.

NOTE: All wiring must conform to NEC and local codes. NOTE: Operating unit on improper line voltage constitutes

abuse and could affect Carrier warranty. See Tables 2 and 3. Do not install unit in a system where voltage may fluctuate above or below permissible limits.

See Tables 2 and 3 for recommended fuse sizes. When making electrical connections, provide clearance at the unit for refrigerant piping connections.

NOTE: The 38HDF units are supplied with a 24-v control transformer. The 38HDR units use the control transformer supplied with the matched indoor unit.

POWER WIRING — Unit is factory wired for voltage shown on nameplate. Provide adequate, fused disconnect switch within sight from unit, readily accessible, but out of reach of children. Provision for locking the switch open (off) is advisable to prevent power from being turned on while unit is being serviced. Disconnect switch, fuses, and field wiring must comply with the NEC and local code requirements. Use copper wire only between the disconnect switch and unit. Use minimum 60 C wire for the field power connection.

Route power wires through the opening in unit side panel and connect in the unit control box as shown on the unit label diagram and Fig. 6 and 7. Unit must be grounded.

CONNECTIONS TO DUCT-FREE FAN COIL UNITS — The 38HDR units are designed for easy match-up to 40QA duct free fan coils. This unit provides 24 v power for the outdoor unit from the fan coil. Connect the Y and C terminals of the indoor unit to the Y and C terminals.

38HDF UNITS

NOTE: For more information see schematic inside unit.

Fig. 5 — Typical Control Circuit Connections

38HDR UNITS

Table 2 — 38HDF Electrical Data

38HDF

UNIT SIZE

018 208/230-1-60 187 253 10.0 48.0 0.80 0.125 0.09 13.3 20 024 208/230-1-60 187 253 14.3 58.3 0.80 0.125 0.09 18.7 30 030 208/230-1-60 187 253 15.7 73.0 0.80 0.125 0.09 20.4 35

036

FLA — Full Load Amps HACR — Heating, Air Conditioning, Refrigeration LRA — Locked Rotor Amps NEC — National Electrical Code RLA — Rated Load Amps (Compressor)

*Permissible limits of the voltage range at which unit will operate

satisfactorily.

NOTES:

1. Control circuit is 24 v on all units and requires an external power source.

2. All motors and compressors contain internal overload protection.

3. In compliance with NEC (U.S.A. Standard) requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker.

4. Motor RLA values are established in accordance with UL (Underwriters’ Laboratories) Standard 465 (U.S.A. Standard).

5. 38HDF,HDR018-030 units are only available in single-phase voltage.

6. Unbalanced 3-Phase Supply Voltage

V-P H- Hz

208/230-1-60 187 253 20.0 112.0 1.45 0.25 0.19 26.5 45 208/230-3-60 187 253 14.7 88.0 1.45 0.25 0.19 19.8 30

460-3-60 414 506 6.6 44.0 0.80 0.25 0.19 9.1 15

LEGEND

VOLTAGE RANGE* COMPRESSOR OUTDOOR FAN MOTOR

Min Max RLA LRA FLA NEC Hp kW Out

Determine maximum deviation from average voltage: (AB) 457 – 452 = 5v

(BC) 464 – 457 = 7v (AC) 457 – 455 = 2v

Maximum deviation is 7 v.

Determine percentage of voltage imbalance:

% Voltage Imbalance = 100 x

= 1.53%

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

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

MIN CKT

AMPS

457

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

the percentage of voltage imbalance:

= 100 x

EXAMPLE: Supply voltage is 460-3-60.

max voltage deviation from average voltage

Use the following formula to determine

average voltage

AB = 452 v BC = 464 v AC = 455 v

FUSE/HACR

BKR AMPS

Average Voltage =

452 + 464 + 455

1371

= 457

Table 3 — 38HDR Electrical Data

38HDR

UNIT SIZE

018 208/230-1-60 187 253 10.0 48.0 0.80 0.125 0.09 13.3 20 024 208/230-1-60 187 253 14.3 58.3 0.80 0.125 0.09 18.7 30 030 208/230-1-60 187 253 15.7 64.0 1.45 0.25 0.19 21.1 35

036

048

060

FLA — Full Load Amps HACR — Heating, Air Conditioning, Refrigeration LRA — Locked Rotor Amps NEC — National Electrical Code RLA — Rated Load Amps (Compressor)

*Permissible limits of the voltage range at which unit will operate

satisfactorily.

NOTES:

1. Control circuit is 24 v on all units and requires an external power source.

2. All motors and compressors contain internal overload protection.

4. Motor RLA values are established in accordance with UL (Underwriters’ Laboratories) Standard 465 (U.S.A. Standard).

5. 38HDF,HDR018-030 units are only available in single-phase voltage.

6. Unbalanced 3-Phase Supply Voltage

V-P H- Hz

208/230-1-60 187 253 15.7 77.0 1.45 0.25 0.19 21.1 35 208/230-3-60 187 253 10.4 88.0 1.45 0.25 0.19 14.5 20

460-3-60 414 506 6.3 38.0 0.80 0.25 0.19 8.7 15 208/230-1-60 187 253 24.3 117.0 1.45 0.25 0.19 31.8 55 208/230-3-60 187 253 15.6 83.1 1.45 0.25 0.19 21.0 35

460-3-60 414 506 6.9 41.0 0.80 0.25 0.19 9.4 15 208/230-1-60 187 253 29.4 134.0 1.45 0.25 0.19 38.2 65 208/230-3-60 187 253 17.8 110.0 1.45 0.25 0.19 23.7 40

460-3-60 414 506 8.6 52.0 0.80 0.25 0.19 11.6 20

LEGEND

VOLTAGE RANGE* COMPRESSOR OUTDOOR FAN MOTOR

Min Max RLA LRA FLA NEC Hp kW Out

Determine maximum deviation from average voltage: (AB) 457 – 452 = 5v

(BC) 464 – 457 = 7v (AC) 457 – 455 = 2v

Maximum deviation is 7 v.

Determine percentage of voltage imbalance:

% Voltage Imbalance = 100 x

= 1.53%

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

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

MIN CKT

AMPS

457

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

the percentage of voltage imbalance:

= 100 x

EXAMPLE: Supply voltage is 460-3-60.

max voltage deviation from average voltage

Use the following formula to determine

average voltage

AB = 452 v BC = 464 v AC = 455 v

FUSE/HACR

BKR AMPS

Average Voltage =

452 + 464 + 455

1371

= 457

38HDF OPERATION SEQUENCE

CALL FOR COOLING:

1. Control voltage from transformer to thermostat (24 v).

run.

rupted. The compressor and outdoor-fan motor will stop.

2. At thermostat 24 v is switched to “G” and “Y.”

3. 24 v from thermostat “G” energizes fan relay at indoor fan coil unit and indoor-fan motor runs.

4. 24 v from thermostat “Y” energizes the contactor coil and the compressor and outdoor-fan motor will both

6. If the internal protection of the compressor or LPS or HPS open, the 24 v to contactor coil will be inter-

Fig. 6 — 38HDF018-036 Typical Wiring Schematic

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Splice

Factory Wiring

Field Control Wiring

Field Power Wiring

Optional or Accessory Wire

LEGEND

C—Contactor, Compressor

CAP — Capacitor

CCHT — Crankcase Heater Thermostat

CH — Crankcase Heater

COMP — Compressor Motor

EQUIP — Equipment

GND — Ground

HPS — High-Pressure Switch

LPS — Low-Pressure Switch

Splice (Field)

OFM — Outdoor-Fan Motor

OL — Overload

TB — Terminal Board

TRAN — Transformer

any original wires with 90° C wire or its equivalent.

NOTES:

1. Compressor and fan motors are thermally protected.

2. Wire in accordance with National Electrical Code (NEC) and local codes. Replace

3. Use minimum 60° C wire for field power wiring.

transformer.

4. Transformer has internal 4.5A thermal fuse on the primary side.

5. Transformer factory wired for 230 v. For 208 v move black wire to 208 volt tap on

6. Crankcase heater and thermostat used on selected models only.

38HDR OPERATION SEQUENCE

CALL FOR COOLING:

1. Control voltage from transformer to thermostat (24 v).

Compressor and outdoor-fan motor run.

rupted, the compressor and outdoor-fan motor will stop, and the CLO will keep the circuit open until reset

by stopping and restarting the 24 v power at the thermostat.

2. At thermostat 24 v is switched to “G” and “Y.”

3. 24 v from thermostat “G” energizes fan relay at indoor fan coil and indoor-fan motor runs.

4. 24 v from thermostat “Y” energizes the logic in the CLO, and the contactor coil, both at the outdoor unit.

6. If the internal protector of the compressor, HPS, or LPS open, the 24 v to the contactor coil will be inter-

Fig. 7 — 38HDR018-060 Typical Wiring Schematic

Splice (Field)

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Splice

Factory Wiring

Field Control Wiring

Field Power Wiring

LEGEND

Thermostat

any original wires with 90° C wire or its equivalent.

safety devices. Before replacing CLO check these devices.

C—Contactor, Compressor

CAP — Capacitor

CCHT — Crankcase Heater

CH — Crankcase Heater

CLO — Compressor Lockout

COMP — Compressor Motor

CT — Current Transformer

EQUIP — Equipment

GND — Ground

HPS — High-Pressure Switch

LPS — Low-Pressure Switch

OFM — Outdoor-Fan Motor

OL — Overload

TB — Terminal Board

NOTES:

1. Compressor and fan motors are thermally protected.

2. Wire in accordance with National Electrical Code (NEC) and local codes. Replace

3. The CLO locks out the COMP to prevent short cycling on COMP overloads and

4. If indoor section has a transformer with a grounded secondary, connect the

grounded side to “C” on the low voltage board.

5. Use minimum 60° C wire for field power wiring.

6. Crankcase heater and thermostat used on selected models only.

START-UP

Preliminary Checks

1. Check that all internal wiring connections are tight and that all barriers, covers, and panels are in place.

2. Field electrical power source must agree with unit nameplate rating.

3. All service valves must be open.

4. Belly-band crankcase heater must be tight on compressor crankcase for those units with belly-band heaters.

Leak Test — Fieldpipingandfancoilmustbeleaktested

by pressure method. Use R-410A at approximately 25 psig backed up with an inert gas to a total pressure not to exceed 245 psig.

Leak detectors should be designed to detect HFC (hydro-

fluorocarbon) refrigerant.

Evacuate and Dehydrate — Fieldpipingandfancoil

must be evacuated and dehydrated.

Charge System — Release charge into system by open-

ing (backseating) liquid and suction line service valves. Refer to separate indoor unit installation instructions for the required total system charge when connected to 25 ft of tubing.

To Start Unit — Be sure that the field disconnect is

closed. Set room thermostat below ambient temperature. Operate unit for 15 minutes, then check system refrigerant charge. See Refrigerant Charging section on page 12.

NOTE: When using in conjunction with 40QA or 40QK fan coils, refer to start-up instructions included with fan coil for correct start-up procedures.

SERVICE

Before performing recommended maintenance, be sure unit main power switch is turned off. Failure to do so may result in electrical shock or injury from rotating fan blade.

Outdoor Fan — A reinforced wire mount holds the out-

door fan assembly in position. See Fig. 8 for proper mounting position.

Internal Current and Temperature Sensitive Overload —

internal compressor motor temperature drops to a safe level (overloads may require up to 45 minutes to reset). When an internal overload is suspected of being open, check by using an ohmmeter or continuity tester.

The control resets automatically when

Pumpdown Procedure — The system may be pumped

down in order to make repairs on the low side without losing complete refrigerant charge.

Never open system to atmosphere while it is under a vacuum. Equipment damage may result.

When system must be opened for service, recover refriger-

ant, break vacuum with dry nitrogen before opening system.

1. Attach pressure gage to suction service valve gage port.

2. Frontseat the liquid/mixed phase line valve.

The 38HDC unit coils hold only the factory-designated amount of refrigerant. Additional refrigerant may cause units to relieve pressure through the compressor internal pressure relief valve (indicated by a sudden rise of suction pressure) before suction pressure reaches 5 psig. If this occurs, shut off unit immediately then frontseat the suction valve and remove and recover excess refrigerant following accepted practices. Equipment damage may result.

3. Start unit and run until suction pressure reaches 20 psig.

4. Shut unit off and frontseat suction valve.

5. Depressurize low side of unit and recover refrigerant following accepted practices.

High-Pressure Switch — The high-pressure switch,

located on discharge line, protects against high discharge pressures caused by such events as overcharge, condenser-fan motor failure, system restriction, etc. It opens on pressure rise at about 650 ± 10 psig. If system pressures go above this setting during abnormal conditions, the switch opens.

38HDF UNIT SIZE, in.

018-030 036

0.433 0

38HDR UNIT SIZE, in.

018,024 030,036 048,060

0.433 0 0

Fig. 8 — Condenser-Fan Mounting Positions

High-Pressure Relief Valve — The high-pressure re-

lief valve is located in the compressor. The relief valve opens at a pressure differential of approximately 550 to 625 ± 50 psid between suction (low side) and discharge (high side) to allow pressure equalization.

DO NOT attempt to simulate these system abnormalities — high pressures pose a serious safety hazard.

The high-pressure switch is checked with an ohmmeter. If

system pressure is below 625 psig switch shows continuity.

Crankcase Heater — The crankcase heater prevents

refrigerant migration and compressor oil dilution during shutdown when compressor is not operating. If the crankcase heater is deenergized for more than 6 hours, both compressor service valves must be closed.

NOTE: Crankcase heaters are only available on 38HDR030060 units.

The crankcase heater is powered by the high-voltage power of the unit. It is connected across the line side of the contactor and is thermostatically controlled.

Use extreme caution when troubleshooting this device, as line voltage is continually present. Serious personal injury could result.

To troubleshoot:

1. Apply voltmeter across crankcase heater leads to see if heater voltage is on. Do not touch heater. Carefully feel area around crankcase heater; if warm, crankcase heater is functioning.

2. With power off and heater leads disconnected, check across leads with ohmmeter. Do not look for a specific resistance reading. Check for resistance or an open circuit, and change heater if an open circuit is detected.

Service Valves — The service valves in the outdoor unit

come from the factory frontseated. This means the refrigerant charge is isolated from the line-set connection ports. To prevent damage to the valve, use a wet cloth or other accepted heat sink material on the valve before brazing.

The service valve cannot be field repaired, therefore, only a complete valve or valve stem seal and service port caps are available for replacement.

Refrigerant Charging

To prevent personal injury, wear safety glasses and gloves when handling refrigerant. Do not overcharge system — this can cause compressor flooding.

Service valves must be fully backseated to close service port. There is no Schrader valve at the service port, and failure to backseat the valve could result in loss of system charge or personal injury.

NOTE: Do not vent or depressurize unit refrigerant to atmosphere. Remove and recover refrigerant following accepted practices.

All units are shipped with the refrigerant charge listed on the nameplate. See indoor unit Installation Instructions for additional charge requirements.

NOTE: For 38HDF units only, charge to nameplate. See the indoor unit owner’s manual for any additional charge requirements.

Refer to Table 4 and consider the following when working with Puron® refrigerant:

• Puron refrigerant cylinders are rose colored.

• Recovery cylinder service pressure rating must be

400 psig, DOT (Department of Transportation) 4BA400

or DOT BW400.

• Puron systems should be charged with liquid refrigerant.

Useacommercialtypemeteringdeviceinthemanifold

hose when charging into suction line with compressor

operating.

• Manifold sets should be 700 psig high side and 180 psig

low side with 550 psig low-side retard.

• Use hoses with 700 psig service pressure rating.

• Puron refrigerant, as with other HFCs, is only compatible

with POE oils.

• Vacuum pumps will not remove moisture from oil.

• Polyol Ester oils absorb moisture rapidly. Do not expose

oil to atmosphere.

• Polyol Ester oils may cause damage to certain plastics

and roofing materials.

• Wrap all filter driers and service valves with wet cloth

when brazing.

• A factory approved, liquid-line filter drier is required on

every unit.

• Do not use a TXV (thermostatic expansion valve)

designed for use with R-22 refrigerant. Refer to separate

indoor unit installation instructions for more details.

• If using a suction line drier, do not leave in place for

more than 72 hours.

Table 4 — Pressure vs. Temperature Chart — Puron® Refrigerant (R-410A)

PRESSURE

TEMPERATURE°FPRESSURE

PSIG

12 –37.7 114 37.8 216 74.3 318 100.2 420 120.7 522 137.6 14 –34.7 116 38.7 218 74.9 320 100.7 422 121.0 524 137.9 16 –32.0 118 39.5 220 75.5 322 101.1 424 121.4 526 138.3 18 –29.4 120 40.5 222 76.1 324 101.6 426 121.7 528 138.6 20 –26.9 122 41.3 224 76.7 326 102.0 428 122.1 530 138.9 22 –24.5 124 42.2 226 77.2 328 102.4 430 122.5 532 139.2 24 –22.2 126 43.0 228 77.8 330 102.9 432 122.8 534 139.5 26 –20.0 128 43.8 230 78.4 332 103.3 434 123.2 536 139.8 28 –17.9 130 44.7 232 78.9 334 103.7 436 123.5 538 140.1 30 –15.8 132 45.5 234 79.5 336 104.2 438 123.9 540 140.4 32 –13.8 134 46.3 236 80.0 338 104.6 440 124.2 544 141.0 34 –11.9 136 47.1 238 80.6 340 105.1 442 124.6 548 141.6 36 –10.1 138 47.9 240 81.1 342 105.4 444 124.9 552 142.1 38 –8.3 140 48.7 242 81.6 344 105.8 446 125.3 556 142.7 40 –6.5 142 49.5 244 82.2 346 106.3 448 125.6 560 143.3 42 –4.5 144 50.3 246 82.7 348 106.6 450 126.0 564 143.9 44 –3.2 146 51.1 248 83.3 350 107.1 452 126.3 568 144.5 46 –1.6 148 51.8 250 83.8 352 107.5 454 126.6 572 145.0 48 0.0 150 52.5 252 84.3 354 107.9 456 127.0 576 145.6 50 1.5 152 53.3 254 84.8 356 108.3 458 127.3 580 146.2 52 3.0 154 54.0 256 85.4 358 108.8 460 127.7 584 146.7 54 4.5 156 54.8 258 85.9 360 109.2 462 128.0 588 147.3 56 5.9 158 55.5 260 86.4 362 109.6 464 128.3 592 147.9 58 7.3 160 56.2 262 86.9 364 110.0 466 128.7 596 148.4 60 8.6 162 57.0 264 87.4 366 110.4 468 129.0 600 149.0 62 10.0 164 57.7 266 87.9 368 110.8 470 129.3 604 149.5 64 11.3 166 58.4 268 88.4 370 111.2 472 129.7 608 150.1 66 12.6 168 59.0 270 88.9 372 111.6 474 130.0 612 150.6 68 13.8 170 59.8 272 89.4 374 112.0 476 130.3 616 151.2 70 15.1 172 60.5 274 89.9 376 112.4 478 130.7 620 151.7 72 16.3 174 61.1 276 90.4 378 112.6 480 131.0 624 152.3 74 17.5 176 61.8 278 90.9 380 113.1 482 131.3 628 152.8 76 18.7 178 62.5 280 91.4 382 113.5 484 131.6 632 153.4 78 19.8 180 63.1 282 91.9 384 113.9 486 132.0 636 153.9 80 21.0 182 63.8 284 92.4 386 114.3 488 132.3 640 154.5 82 22.1 184 64.5 286 92.8 388 114.7 490 132.6 644 155.0 84 23.2 186 65.1 288 93.3 390 115.0 492 132.9 648 155.5 86 24.3 188 65.8 290 93.8 392 115.5 494 133.3 652 156.1 88 25.4 190 66.4 292 94.3 394 115.8 496 133.6 656 156.6 90 26.4 192 67.0 294 94.8 396 116.2 498 133.9 660 157.1 92 27.4 194 67.7 296 95.2 398 116.6 500 134.0 664 157.7 94 28.5 196 68.3 298 95.7 400 117.0 502 134.5 668 158.2 96 29.5 198 68.9 300 96.2 402 117.3 504 134.8 672 158.7

98 30.5 200 69.5 302 96.6 404 117.7 506 135.2 676 159.2 100 31.2 202 70.1 304 97.1 406 118.1 508 135.5 680 159.8 102 32.2 204 70.7 306 97.5 408 118.5 510 135.8 684 160.3 104 33.2 206 71.4 308 98.0 410 118.8 512 136.1 688 160.8 106 34.1 208 72.0 310 98.4 412 119.2 514 136.4 692 161.3 108 35.1 210 72.6 312 98.9 414 119.6 516 136.7 696 161.8 110 35.5 212 73.2 314 99.3 416 119.9 518 137.0 112 36.9 214 73.8 316 99.7 418 120.3 520 137.3

TEMPERATURE°FPRESSURE

PSIG

TEMPERATURE°FPRESSURE

PSIG

TEMPERATURE°FPRESSURE

PSIG

TEMPERATURE°FPRESSURE

PSIG

TEMPERATURE

°F

Subcooling Method — For 38HDR units only, the sub-

cooling method is used to check and adjust charge during the cooling season. Refer to Table 5 and the following procedure:

NOTE: For use with residential fan coils and the 40QA060 under ceiling unit only.

1. Operate unit a minimum of 15 minutes before checking charge.

2. Measure liquid line temperature near liquid line service valve, and measure the liquid pressure at the liquid line service valve. Use a digital thermometer for all temperature measurements. DO NOT use mercury or dial-type thermometers.

3. Refer to Table 5. Find the temperature point at which the required subcooling temperature intersects the measured liquid line pressure.

4. If the measured liquid line temperature does not agree with the required liquid line temperature, ADD refrigerant to lower the temperature, or REMOVE refrigerant to raise the temperature (allow a tolerance of ±3° F).

Table 5 — Subcooling Charging Table

REQUIRED LIQUID LINE

LIQUID PRESSURE

AT S ERVIC E VA LVE

(psig)

189 58 56 54 52 50 48 195 60 58 56 54 52 50 202 62 60 58 56 54 52 208 64 62 60 58 56 54 215 66 64 62 60 58 56 222 68 66 64 62 60 58 229 70 68 66 64 62 60 236 72 70 68 66 64 62 243 74 72 70 68 66 64 251 76 74 72 70 68 66 259 78 76 74 72 70 68 266 80 78 76 74 72 70 274 82 80 78 76 74 72 283 84 82 80 78 76 74 291 86 84 82 80 78 76 299 88 86 84 82 80 78 308 90 88 86 84 82 80 317 92 90 88 86 84 82 326 94 92 90 88 86 84 335 96 94 92 90 88 86 345 98 96 94 92 90 88 354 100 98 96 94 92 90 364 102 100 98 96 94 92 374 104 102 100 98 96 94 384 106 104 102 100 98 96 395 108 106 104 102 100 98 406 110 108 106 104 102 100 416 112 110 108 106 104 102 427 114 112 110 108 106 104 439 116 114 112 110 108 106 450 118 116 114 112 110 108 462 120 118 116 114 112 110 474 122 120 118 116 114 112 486 124 122 120 118 116 114 499 126 124 122 120 118 116 511 128 126 124 122 120 118

TEMPERATURE (F)

Required Subcooling

Temperature (F)

8 1012141618

Compressor Lockout Switch — The 38HDR units

are provided with a compressor lockout protective device. If the compressor shuts down due to any safety device, a current loop monitoring the compressor current senses no current flow. The unit will lock out until the control power is interrupted to reset the lockout. Determine the reason for the safety trip. To restart, turn the thermostat to the OFF position and then set the thermostat to an operating position.

MAINTENANCE

Before performing recommended maintenance, be sure unit main power switch is turned off. Failure to do so may result in electric shock or injury from rotating fan blade.

Lubrication

COMPRESSOR — Compressor contains factory oil charge; replace oil when lost. Use Mobile 3MA-POE oil.

Cleaning Coils — Coil should be washed out with water

or blown out with compressor air. Note that the blow-thru design causes dirt and debris to build up on the inside of the coils.

Clean coil annually or as required by location and outdoor air conditions. Inspect coil monthly and clean as required. Fins are not continuous through coil sections. Dirt and debris may pass through first section, become trapped between the row of fins and restrict condenser airflow. Use a flashlight to determine if dirt or debris has collected between coil sections. Clean coil as follows:

1. Turn off unit power.

2. Using a garden hose or other suitable equipment, flush coil from the outside to remove dirt. Be sure to flush all dirt and debris from drain holes in base of unit. Fan motors are waterproof.

TROUBLESHOOTING

See Fig. 9 for troubleshooting information.

Fig. 9 — Troubleshooting the Cooling Cycle

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

Book 1 4 Ta b 3 e 2 f

Catalog No. 02-38HD0001-SI Printed in U.S.A. Form 38HD-4SI Pg 16 2-06A 1-06 Replaces: 38HDC-3SI

Carrier 38HDF018-036, 38HDR018-060 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual