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5. Remove crankcase heater from compressor base.
6. Remove compressor holddown bolts and lift compres-

sor off basepan.

7. Remove compressor from unit.
8. Clean system. Add new liquid line filter drier (biflow

type).

9. Install new compressor and position in unit. Connect suc-

tion and discharge lines to compressor. Connect high pres-
sure switch. Ensure that compressor holddown bolts are
in place. Connect wiring. Install crankcase heater.

10. Evacuate and recharge unit.
11. Restore unit power.

Cooling Mode Operation —

See Fig. 16.

1. Hot refrigerant gas from compressor flows through the

reversing valve and is directed to the outdoor coil vapor
header.

2. Once at the outdoor coil vapor header, hot refrigerant gas

flows up to check valve

A,

which is closed. All refrig-

erant is then directed to complete a path through the lower
6 coil circuits (6 passes in each circuit).

3. Refrigerant flows through from the liquid header side out-

lets into the transfer header, where it flows upward.

4. Refrigerant leaves the transfer header through side con-

nections in 4 locations and enters the middle coil circuits
(4 coil circuits above check valve

A

).

5. Refrigerant leaves the 4 middle coil circuit and enters the

top portion of vapor header. The refrigerant moves up to
the top 2 remaining coil circuits, where it enters the sub-
cooler section.

6. Subcooled refrigerant leaves the coil circuits through the

side outlets. It passes through check valve

B

into the

system liquid line and then into the indoor coil.

7. Liquid refrigerant is expanded and evaporated to a low-

pressure vapor in the indoor coil. Refrigerant vapor then
returns to the outdoor unit through the system vapor line,
where it is drawn through the reversing valve and accu-
mulator and back to the compressor suction connection.

Heating Mode Operation —

See Fig. 17.

1. Hot gas from compressor flows through the reversing valve

and is directed to the system vapor line and indoor coil
vapor header (not shown). Refrigerant is condensed and
subcooled in the indoor coil and returns to the outdoor
unit through the system liquid line.

2. Check valve

B

is closed and all liquid refrigerant enters

the liquid header.

3. Refrigerant leaves the liquid header through 12 loca-

tions. It is then expanded in fixed orifice metering de-
vices contained within the outlet tubes.

4. Refrigerant evaporates to low pressure vapor as it com-

pletes its passage through the 12 parallel coil circuits (6
passes each).

5. Refrigerant moves from the coil circuits into the vapor

header, where it is drawn through the reversing valve and
accumulator and back to compressor suction connection.

Fig. 12 — Cleaning Outdoor Coil

Fig. 13 — Propping Up Top Panel

Fig. 14 — Separating Coil Sections

Fig. 15 — Outdoor-Fan Adjustment

12

Summary of Contents for AIR COOLED SPLIT SYSTEM 38AQS008

Page 1: ...pre cautions in literature and on tags and labels attached to unit Follow all safety codes Wear safety glasses and work gloves Use quenching cloth for brazing operations Have fire ex tinguisher available Read these instructions thoroughly Con sult local building codes and National Electrical Code U S A NEC for special installation requirements Before installing or servicing system always turn off ...

Page 2: ... REQUIREMENTS Consult local building codes and NEC U S A for spe cial installation requirements Allow sufficient space for airflow clearance wiring re frigerant piping and servicing unit See Fig 2 Locate unit so that outdoor unit airflow is unrestricted on all sides and above Refer to Fig 2 Unit may be mounted on a level pad directly on base rails or mounted on raised pads at support points See Fi...

Page 3: ...s field supplied Sporlan MKC 2 coils Wire the solenoid in parallel with the compressor con tactor coil Install the LLSV near the outdoor unit The flow arrow must be pointed toward the outdoor unit SAFETY RELIEF A fusible plug is located on top of the accumulator See Fig 6 Note that all safety relief compo nents are factory installed Do not cap fusible plug If local code requires additional safety ...

Page 4: ...n 305 mm the other The side getting the greater clearance is optional c Overhead 60 in 1524 mm to assure proper outdoor fan operation d Between units control box side 42 in 1067 mm per National Electrical Code NEC U S A e Between unit and ungrounded surfaces control box side 36 in 914 mm per NEC U S A f Between unit and block or concrete walls and other grounded surfaces control box side 42 in 106...

Page 5: ...ions Carrier approved thermostat is Part Number HH07AT 171 Subbase is HH93AZ 188 Route thermostat cable or equivalent single leads of col ored wire from subbase terminals to low voltage connec tions on unit shown in Fig 9 as described in Steps 1 through 3 below 1 Connect thermostat wires to screw terminals of low voltage connection board 2 Pass the control wires through the hole provided in the co...

Page 6: ...es 3 Wiring and piping shown are general points of connection guides only and are not intended for or to include all details for a specific installation 4 Liquid line solenoid valve solenoid drop control is recommended to prevent refrigerant migration to the compressor A biflow type solenoid valve is required 5 Filter drier must be of the biflow type suitable for heat pump duty 6 Internal factory ...

Page 7: ...and combi nation load equipment refer to NEC Articles 430 and 440 the overcurrent protective device for the unit shall be fuse or HACR breaker 2 Unbalanced 3 Phase Supply Voltage Never operate a motor where a phase imbalance in supply volt age is greater than 2 Use the following formula to determine the percent voltage imbalance max voltage deviation from average voltage 100 x average voltage Exam...

Page 8: ... 918 1 575 915 1 1 089 NOTE The following equation converts kW of heat energy to Btuh kW x 3 412 Btuh Table 5B Accessory Electric Heater Data 50 Hz UNIT 40RMQ HEATER PART NO V PH Hz NOMINAL kW HEATER AMPS MCA MOCP 008 CAELHEAT002A00 400 3 50 3 47 5 0 11 1 15 CAELHEAT001A00 230 3 50 4 59 11 5 25 0 30 CAELHEAT005A00 400 3 50 6 94 10 0 17 3 25 CAELHEAT004A00 230 3 50 9 18 23 1 39 5 50 CAELHEAT008A00 ...

Page 9: ...ermostatic Expansion Valve LEGEND Fig 8 38AQS008 Power Wiring Connections C Contactor NEC National Electrical Code U S A Field Wiring Factory Wiring Splice Connection Factory Supplied LEGEND Fig 9 Control Wiring Connections C Cooling LLSV Liquid Line Solenoid Valve H Heating HR Heater Relay SUPL Supplemental IFC Indoor Fan Contactor TB Terminal Block Fig 10 Field Control Wiring Raceway 9 801 ...

Page 10: ...ting range of the unit Operate unit a minimum of 15 minutes Ensure pressure and temperature readings have stabilized Plot liquid pres sure and temperature on chart and add or reduce charge to meet curve Adjust charge to conform with charging chart using liquid pressure and temperature to read chart OIL CHARGE Tables 1A and 1B Allow unit to run for about 20 minutes Stop unit and check compressor oi...

Page 11: ...ve and will automatically reset Unit is equipped with a no dump reversing valve circuit When unit is in cooling mode reversing valve remains in cooling position until a call for heating is requested by ther mostat When unit is in heating mode reversing valve re mains in heating position until there is a call for cooling SERVICE When servicing unit shut off all electrical power to unit to avoid sho...

Page 12: ...ning coil circuits where it enters the sub cooler section 6 Subcooled refrigerant leaves the coil circuits through the side outlets It passes through check valve B into the system liquid line and then into the indoor coil 7 Liquid refrigerant is expanded and evaporated to a low pressure vapor in the indoor coil Refrigerant vapor then returns to the outdoor unit through the system vapor line where ...

Page 13: ...Fig 16 Cooling Mode Operation Fig 17 Heating Mode Operation 13 ...

Page 14: ...TROUBLESHOOTING CHART COOLING CYCLE LEGEND TXV Thermostatic Expansion Valve 14 ...

Page 15: ...TROUBLESHOOTING CHART HEATING CYCLE LEGEND N C Normally Closed 15 ...

Page 16: ......

Page 17: ......

Page 18: ...ue or change at any time specifications or designs without notice and without incurring obligations PC 111 Catalog No 533 887 Printed in U S A Form 38AQS 4SI Pg 18 801 6 95 Replaces 38AQS 3SI Book 1 4 Tab 5a 5a Copyright 1995 Carrier Corporation ...

Page 19: ... DRAINAGE Y N ARE PROPER AIR FILTERS IN PLACE Y N HAVE FAN AND MOTOR PULLEYS BEEN CHECKED FOR PROPER ALIGNMENT Y N DO THE FAN BELTS HAVE PROPER TENSION Y N HAS CORRECT FAN ROTATION BEEN CONFIRMED Y N PIPING IS LIQUID LINE SOLENOID VALVE LOCATED AT THE OUTDOOR UNIT AS RECOMMENDED Y N HAVE LEAK CHECKS BEEN MADE AT COMPRESSOR OUTDOOR COIL INDOOR COIL TXV Thermostatic Expansion Valve SOLENOID VALVES F...

Page 20: ...G DOTTED LINE CUT ALONG DOTTED LINE C Start Up CHECK INDOOR FAN SPEED AND RECORD CHECK OUTDOOR FAN SPEED AND RECORD AFTER AT LEAST 15 MINUTES RUNNING TIME RECORD THE FOLLOWING MEASUREMENTS COOLING HEATING OIL PRESSURE SUCTION PRESSURE SUCTION LINE TEMP DISCHARGE PRESSURE DISCHARGE LINE TEMP ENTERING OUTDOOR AIR TEMP LEAVING OUTDOOR AIR TEMP INDOOR ENTERING AIR DB dry bulb TEMP INDOOR ENTERING AIR ...

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