Warning – Carrier 50CR User Manual

Page 17

SEC-2

SEC-1

HK38EA002

ABCD

COMM

OAT

HUM C

W O

HEATER

MOTOR

STATUS

A03169

Fig. 19 -- Detail of Printed Circuit Board

PRE--START--UP

FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury

or death and/or property damage.

1. Follow recognized safety practices and wear protective

goggles when checking or servicing refrigerant system.

2. Do not operate compressor or provide any electric power

to unit unless compressor terminal cover is in place and

secured.

3. Do not remove compressor terminal cover until all

electrical sources are disconnected and tagged.

4. Relieve and recover all refrigerant from system before

touching or disturbing anything inside terminal box if

refrigerant leak is suspected around compressor terminals.

5. Never attempt to repair soldered connection while

refrigerant system is under pressure.

6. Do not use torch to remove any component. System

contains oil and refrigerant under pressure.

7. To remove a component, wear protective goggles and

proceed as follows:

a. Shut off electrical power to unit and install lockout

tag.

b. Relieve and reclaim all refrigerant from system

using both high-- and low--pressure ports.

c. Cut component connecting tubing with tubing

cutter and remove component from unit.

d. Carefully unsweat remaining tubing stubs when

necessary. Oil can ignite when exposed to torch

flame.

WARNING

Use the Start--Up Checklist supplied at the end of this book and

proceed as follows to inspect and prepare the unit for initial start--up:

1. Remove all access panels.
2. Read and follow instructions on all DANGER, WARNING,

CAUTION, and INFORMATION labels attached to, or
shipped with unit.

3. Make the following inspections:

a. Inspect for shipping and handling damages, such as

broken lines, loose parts, disconnected wires, etc.

b. Inspect for oil at all refrigerant tubing connections and on

unit base. Detecting oil generally indicates a refrigerant

leak. Leak test all refrigerant tubing connections using
electronic leak detector, or liquid--soap solution. If a

refrigerant leak is detected, see following Check for
Refrigerant Leaks section.

c. Inspect all field-- and factory--wiring connections. Be

sure that connections are completed and tight.

d. Ensure wires do not touch refrigerant tubing or sharp

sheet metal edges.

e. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

4. Verify the following conditions:

a. Make sure that outdoor fan blade is correctly positioned

in fan orifice (See Fig. 24).

b. Make sure that condensate drain pan and trap are filled

with water to ensure proper drainage.

c. Make sure that all tools and miscellaneous loose parts

have been removed.

5. Compressors are internally spring mounted. Do not loosen

or remove compressor holddown bolts.

6. Each unit system has two Schrader--type ports, one low--side

Schrader fitting located on the suction line, and one
high--side Schrader fitting located on the compressor

discharge line. Be sure that caps on the ports are tight.

START--UP

Step 1—Unit Start--Up
NOTE: Always check high-- and low--voltage supply to the unit

components. Check the integrity of the plug receptacle connections

and unit wiring harness prior to assuming a component failure.

A. LED Description:

LEDs built into Infinityt control board provide installer or service
person information concerning operation and/or fault condition of

the unit control and ECM motor. This information is also available
at the system user interface in text with basic troubleshooting

instructions. Careful use of information displayed will reduce the

need for extensive manual troubleshooting.
The amber LED located at bottom center of control adjacent to

motor harness plug is Motor Status LED and it is labeled MOTOR.
A second amber LED located in upper right center of control

adjacent to System Communications connector (A,B,C,D) is the
System Status LED and it is labeled STATUS. The green LED

labeled COMM is also located adjacent to System Communications

connector, below STATUS LED, and is used as an indicator of
system communications status. Status Codes will be displayed on

the STATUS LED using the following protocol:

1. The number of short flashes indicates first digit of code.
2. The number of long flashes indicates second digit of code.
3. A short flash is 0.25 seconds on. A long flash is 1 second on.
4. The time between flashes is 0.25 seconds.
5. The time between last short flash and first long flash is 1

second.

6. The LED will be off for 2.5 seconds before repeating code.

B. Control

Start--Up

and

System

Communications

Troubleshooting:

On power up, green COMM LED will be turned off until successful

system communications are established (this should happen within

50C