Warning, Pre--start--up, Start--up – Carrier 50JZ-A User Manual

Page 13: Step 1 — check for refrigerant leaks

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13

A00010

LED

STATUS

OFF

No call for compressor operation

FLASHING

Reversed phase

ON

Normal

Fig. 13 -- Phase Monitor Control and LED Indicators

PRE--START--UP

FIRE,

EXPLOSION,

ELECTRICAL

AND

ENVIRONMENTAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,

death or property damage.

1. Follow recognized safety practices and wear protective

goggles when checking or servicing refrigerant system.

2. Relieve and recover all refrigerant from system before

touching or disturbing compressor plug if refrigerant
leak is suspected around compressor terminals.

3. Do not remove compressor plug until all electrical

sources are disconnected and tagged.

4. Never attempt to repair soldered connection while

refrigerant system is under pressure.

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

contains oil and refrigerant under pressure.
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 (see Fig. 18).

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. Ensure wires
do not touch refrigerant tubing or sharp sheet metal

edges.

d. 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.

b. Make sure that air filter(s) is in place.

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

with water to ensure proper drainage.

d. Make sure that all tools and miscellaneous loose parts

have been removed.

5. Each unit system has 2 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

Checking Cooling and Heating Control Operation

Start and check the unit for proper control operation as follows:

(1.) Place room thermostat SYSTEM switch or MODE

control in OFF position. Observe that blower
motor starts when FAN mode is placed in FAN ON
position and shuts down when FAN MODE switch

is placed in AUTO position.

(2.) Place SYSTEM switch in cool mode. Lower

setpoint to call for cooling. Observe that
compressor, indoor and outdoor fans start and

deliver cooling.

(3.) Place SYSTEM switch or MODE control in HEAT

position. Set control above room temperature.

Observe that compressor, outdoor fan, and indoor
blower motors start. Observe that heating cycle

shuts down when control setting is satisfied.

NOTE: Once the compressor has started and then has stopped, it
should not be started again until 5 minutes have elapsed. The
defrost board has a built--in 5 minute delay between cycles. The 5
minute compressor delay also applies to heat pump heating mode.

Step 1 — Check for Refrigerant Leaks

Proceed as follows to locate and repair a refrigerant leak and to
charge the unit:

1. Locate leak and make sure that refrigerant system pressure

has been relieved and reclaimed from both high-- and

low--pressure ports.

2. Repair leak following Refrigerant Service procedures.

NOTE: Install a bi--flow filter drier whenever the system has been
opened for repair.

3. Add a small charge of R--410A refrigerant vapor to system

and leak--test unit.

4. Recover refrigerant from refrigerant system and evacuate to

500 microns if no additional leaks are not found.

50J

Z

--

A

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