Carrier GEMINI 38APD025-100 User Manual

33
PRE-START-UP
Do not attempt to start the air-conditioning system until the
following checks have been completed.
System Check
1. Check all system components, including the air-handling
equipment. Consult manufacturer's instructions. If the
unit has field-installed accessories, be sure all are proper-
ly installed and wired correctly. Refer to unit wiring
diagrams.
2. Open liquid line and suction line service valves.
3. Check tightness of all electrical connections.
4. Oil should be visible in the compressor sight glasses. An
acceptable oil level in the compressor is from
1
/
8
to
3
/
8
of
sight glass. Adjust the oil level as required. No oil should
be removed unless the crankcase heater has been ener-
gized for at least 24 hours. See Add Oil section on
page 47, for Carrier-approved oils.
5. Electrical power source must agree with unit nameplate.
6. Crankcase heaters must be firmly attached to compres-
sors, and must be on for 24 hours prior to start-up.
7. Fan motors are 3-phase. Check rotation of fans during
first start-up check.
EVACUATION AND DEHYDRATION — Because the
38AP systems use polyolester (POE) oil, which can absorb
moisture, it is important to minimize the amount of time that
the system interior is left exposed to the atmosphere. Minimiz-
ing the exposure time of the oil to the atmosphere will mini-
mize the amount of moisture that needs to be removed during
evacuation.
Once all of the piping connections are complete, leak test
the unit and then pull a deep dehydration vacuum. Connect the
vacuum pump to the charging valve in the suction line and to
the liquid line service valve. For best results, it is recommended
that a vacuum of at least 500 microns (0.5 mm Hg) be ob-
tained. Afterwards, to ensure that no moisture is present in the
system, perform a standing vacuum-rise test.
With the unit in deep vacuum (500 microns or less), isolate
the vacuum pump from the system. Observe the rate-of-rise of
the vacuum in the system. If the vacuum rises by more than
50 microns in a 30-minute time period, then continue the dehy-
dration process. Maintain a vacuum on the system until the
standing vacuum requirement is met. This will ensure a dry
system.
By following these evacuation and dehydration procedures,
the amount of moisture present in the system will be mini-
mized. It is required that liquid line filter driers be installed
between the condenser(s) and the expansion devices to capture
any foreign debris and provide additional moisture removal
capacity.
START-UP
Compressor crankcase heaters must be on for 24 hours be-
fore start-up. To energize the crankcase heaters, close the field
disconnect and turn on the fan circuit breakers. Leave the com-
pressor circuit breakers off/open. The crankcase heaters are
now energized.
Preliminary Charge — Refer to GTAC II (General
Training Air Conditioning), Module 5, Charging, Recovery,
Recycling, and Reclamation for charging procedures. Using
the liquid charging method and charging by weight procedure,
charge each circuit with the amount of Puron
®
refrigerant
(R-410A) listed in Table 15.
IMPORTANT: Before beginning Pre-Start-Up or Start-Up,
review Start-Up Checklist at the back of this publication.
The checklist assures proper start-up of a unit and provides
a record of unit condition, application requirements, system
information, and operation at initial start-up.
IMPORTANT: Before beginning Pre-Start-Up or Start-Up,
review Start-Up Checklist at the back of this publication.
The checklist assures proper start-up of a unit and provides
a record of unit condition, application requirements, system
information, and operation at initial start-up.
CAUTION
Crankcase heaters on all units are wired into the control cir-
cuit, so they are always operable as long as the main power
supply disconnect is on (closed), even if any safety device
is open. Compressor heaters must be on for 24 hours prior
to the start-up of any compressor. Equipment damage
could result if heaters are not energized for at least 24 hours
prior to compressor start-up.
(F)
90
80
70
60
50
40
30
20
10
0
(C)
32.2
26.7
21.1
15.6
10.0
4.4
-1.1
-6.7
-12.2
-17.8
SUPPLY SETPOINT
0 5 10 15 20
SETPOINT SIGNAL – 4-20 mA INPUT
Fig. 34 — 4 to 20 mA Supply Set Point

Carrier GEMINI 38APD025-100 Specifications

General

Brand	Carrier
Model	GEMINI 38APD025-100
Category	Air Conditioner
Language	English

Summary

SAFETY CONSIDERATIONS

CONTROLS

General

Overview of the 38AP condensing unit's ComfortLink control system.

Conventions Used in This Manual

Explains text conventions for navigating the control system display menus.

Display Module Usage

Details the 4-key interface for accessing unit information and testing.

CONTROL COMPONENTS

Overview of the main control components like MBB, CSB, EMM.

Sensors

Details various sensors used for monitoring unit conditions.

Operating Modes

Describes various operating modes like Ramp Load and Demand Limit.

Set Point Adjustment

Covers adjusting set points for cooling and temperature reset.

Demand Limit

Explains different types of demand limiting configurations.

PRE-START-UP

System Check

Verifies proper installation and condition of unit components before start-up.

Adjust Refrigerant Charge

Check Compressor Oil Level

Actual Start-Up

Steps for starting the unit, including fan and control checks.

OPERATION

Ambient Limitations

Lists minimum and maximum ambient operating temperatures for the unit.

Voltage (All Units)

Explains acceptable supply voltage ranges and imbalance limits.

Operation Sequence

Describes the unit's start-up and running sequence.

SERVICE

Electronic Components

Overview of the control system and component access.

Thermistors

Details thermistor functions and types used for unit control.

Pressure Transducers

Motormaster® V Controller

Low-ambient operation accessory and troubleshooting.

DRIVE PROGRAMMING

Fault Codes

REPLACING DEFECTIVE MODULES

COMPRESSOR REPLACEMENT

Refers to procedures included with new compressors for replacement.

TROUBLESHOOTING

Complete Unit Stoppage and Restart

Discusses unit stoppage causes and restart methods.

Compressor Safeties

Explains compressor protection mechanisms and triggers.

Advanced Scroll Temperature Protection

Alarms and Alerts

Warnings of abnormal conditions causing shutdown, with code numbers.

Wiring Error

COMPRESSOR STUCK ON FAILURE ALARMS

Alarms when current sensor detects current when compressor is off.

T114 (Circuit A Low Superheat)

A151 (Illegal Configuration)

Indicates an invalid configuration has been entered into the system.

Table 26 Alarm and Alert Codes

Compressor Availability Alerts

Alerts for circuit compressor availability issues.

Compressor Failure Alerts

Alerts for compressor failure due to current sensor issues.

Thermistor Failure Alerts

Alerts for thermistor failures in various sensors.

Pressure Transducer Failure Alerts

Alerts for discharge and suction pressure transducer failures.

Loss of Charge Alerts

Alerts for low refrigerant charge conditions.

APPENDIX A — DISPLAY TABLES (cont)

Run Status Mode and Sub-Mode Directory

Lists items and displays for Run Status mode.

APPENDIX A — DISPLAY TABLES (cont)

Service Test Mode and Sub-Mode Directory

Lists items and displays for Service Test mode.

APPENDIX A — DISPLAY TABLES (cont)

Temperature Mode and Sub-Mode Directory

Lists items and displays for Temperature mode.

APPENDIX A — DISPLAY TABLES (cont)

Inputs Mode and Sub-Mode Directory

Lists items and displays for Inputs mode.

Outputs Mode and Sub-Mode Directory

Lists items and displays for Outputs mode.

APPENDIX A — DISPLAY TABLES (cont)

Configuration Mode and Sub-Mode Directory

Lists items and displays for Configuration mode.

APPENDIX A — DISPLAY TABLES (cont)

Time Clock Mode and Sub-Mode Directory

Lists items and displays for Time Clock mode.

APPENDIX A — DISPLAY TABLES (cont)

Operating Mode and Sub-Mode Directory

Lists modes controlling the unit.

Alarms Mode and Sub-Mode Directory

Lists active alarms and alert history.

APPENDIX B — CCN TABLES (cont)

Status Tables

Displays unit parameters and their point names.

APPENDIX B — CCN TABLES (cont)

CCN Configuration Tables

Lists CCN configuration parameters and their point names.

APPENDIX B — CCN TABLES (cont)

CCN Maintenance Tables

Lists CCN maintenance parameters.

Start-Up Checklist for 38AP Split System Condensing Unit

I. Project Information

Section for recording project details like job name and address.

II. Preliminary Equipment Check

Checks for physical damage and proper installation of unit components.

Refrigeration System Check

III. Unit Start-Up

Steps for verifying unit start-up conditions and parameters.

Start and Operate Machine. Complete the Following:

OPERATING DATA:

Section to record operating temperatures and pressures in stable condition.