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11

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 name-

plate 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 —

Field piping and fan coil must be leak tested

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 —

Field piping and fan coil

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. Oper-
ate 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

Outdoor Fan —

A reinforced wire mount holds the out-

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

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.

Internal Current and Temperature Sensitive
Overload —

The

control

resets

automatically

when

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.

Pumpdown Procedure —

The system may be pumped

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

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.

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.

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 38HDR030-
060 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.

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.

Never open system to atmosphere while it is under a vac-
uum. Equipment damage may result.

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.

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

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

Fig. 8 — Condenser-Fan Mounting Positions

38HDF UNIT SIZE, in.

018-030

036

0.433

0

38HDR UNIT SIZE, in.

018,024

030,036

048,060

0.433

0

0

Содержание 38HDF018 --- --- ---3

Страница 1: ...l building codes and the National Electrical Code NEC for special installation requirements INSTALLATION Step 1 Complete Pre Installation Checks UNPACK UNIT See Fig 1 Move the unit to final loca tion Remove unit from carton being careful not to damage service valves and grilles INSPECT SHIPMENT File a claim with the shipping company if shipment is damaged or incomplete Check unit nameplate to ensu...

Страница 2: ...2 6 1 2 1 7 5 8 2 1 13 16 3 4 1 16 1 2 1 2 0 8 1 2 1 6 7 8 0 3 7 16 0 6 1 2 1097 1131 9 433 4 468 3 774 7 498 5 893 4 1017 9 354 2 215 9 479 4 88 165 4 UNIT SIZE M OPERATING WT in mm lb kg 38HDF 018 5 8 15 88 166 75 3 024 5 8 15 88 176 79 8 030 3 4 19 05 187 84 8 036 3 4 19 05 250 113 4 38HDR 018 5 8 15 88 166 75 8 024 5 8 15 88 176 79 8 030 3 4 19 05 187 84 8 036 3 4 19 05 250 113 4 048 7 8 22 22...

Страница 3: ...ere 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 transmit ted to structure Leave some...

Страница 4: ... of 40 va is provided in the fan coil unit To avoid damage while brazing service valves should be wrapped with a heat sinking material such as a wet cloth When brazing tubing sets to the service valves a brazing shield MUST be used to prevent damage to the painted unit surface 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 4...

Страница 5: ...L Face Area sq ft 5 8 7 3 12 1 12 1 14 1 14 1 No Rows 2 3 2 2 3 3 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 3 8 3 8 3 8 3 8...

Страница 6: ... 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 fa...

Страница 7: ...rmine maximum deviation from average voltage AB 457 452 5 v BC 464 457 7 v AC 457 455 2 v Maximum deviation is 7 v Determine percentage of voltage imbalance This amount of phase imbalance is satisfactory as it is below the maximum allowable of 2 38HDF UNIT SIZE V PH Hz VOLTAGE RANGE COMPRESSOR OUTDOOR FAN MOTOR MIN CKT AMPS FUSE HACR BKR AMPS Min Max RLA LRA FLA NEC Hp kW Out 018 208 230 1 60 187 ...

Страница 8: ... amount of phase imbalance is satisfactory as it is below the maximum allowable of 2 38HDR UNIT SIZE V PH Hz VOLTAGE RANGE COMPRESSOR OUTDOOR FAN MOTOR MIN CKT AMPS FUSE HACR BKR AMPS Min Max RLA LRA FLA NEC Hp kW Out 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 20...

Страница 9: ...High Pressure Switch LPS Low Pressure Switch OFM Outdoor Fan Motor OL Overload TB Terminal Board TRAN Transformer Splice Field Terminal Marked Terminal Unmarked Terminal Block Splice Factory Wiring Field Control Wiring Field Power Wiring Optional or Accessory Wire Fig 6 38HDF018 036 Typical Wiring Schematic 38HDF OPERATION SEQUENCE CALL FOR COOLING 1 Control voltage from transformer to thermostat ...

Страница 10: ...ipment GND Ground HPS High Pressure Switch LPS Low Pressure Switch OFM Outdoor Fan Motor OL Overload TB Terminal Board Splice Field Terminal Marked Terminal Unmarked Terminal Block Splice Factory Wiring Field Control Wiring Field Power Wiring 38HDR OPERATION SEQUENCE CALL FOR COOLING 1 Control voltage from transformer to thermostat 24 v 2 At thermostat 24 v is switched to G and Y 3 24 v from therm...

Страница 11: ... 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 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 s...

Страница 12: ...llowing 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 Use a commercial type metering device in the manifold hose when charging into suction line with compressor operating Manifold sets should be 70...

Страница 13: ... 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 46...

Страница 14: ...sing 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 LIQUID PRESSURE AT SERVICE VALVE psig REQUIRED LIQUID LINE TEMPERATURE F Required Subcooling Temperature F 8 10 12 14 16 18 189 58 56 54 52 50 48 195 60 58 ...

Страница 15: ...15 Fig 9 Troubleshooting the Cooling Cycle ...

Страница 16: ...ue or change at any time specifications or designs without notice and without incurring obligations Catalog No 02 38HD0001 SI Printed in U S A Form 38HD 4SI Pg 16 2 06A 1 06 Replaces 38HDC 3SI Book 1 4 Tab 3e 2f Copyright 2006 Carrier Corporation ...

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