GVZC20 Installation Manual
8
REFRIGERANT UNDER PRESSURE!
• D
O
NOT
OVERCHARGE
SYSTEM
WITH
REFRIGERANT
.
• D
O
NOT
OPERATE
UNIT
IN
A
VACUUM
OR
AT
NEGATIVE
PRESSURE
.
F
AILURE
TO
FOLLOW
PROPER
PROCEDURES
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
CAUTION
U
SE
REFRIGERANT
CERTIFIED
TO
AHRI
STANDARDS
. U
SED
REFRIGERANT
MAY
CAUSE
COMPRESSOR
DAMAGE
,
AND
THE
WARRANTY
. M
OST
PORTABLE
MACHINES
CANNOT
CLEAN
USED
REFRIGERANT
TO
MEET
AHRI
STANDARDS
.
IS
NOT
COVERED
UNDER
CAUTION
CAUTION
1. Connect the vacuum pump with 500 micron capability
to the service valves.
2. Evacuate the system to 500 microns or less using
gas and liquid service valves. Using both valves is
necessary as some compressors create a mechanical
seal separating the sides of the system.
3. Close pump valve and hold vacuum for 10 minutes.
Typically pressure will rise during this period.
• If the pressure rises to 1000 microns or less and
remains steady the system is considered leak-
free; proceed to start-up.
• If pressure rises above 1000 microns but holds
steady below 2000 microns, moisture and/
or noncondensibles may be present or the
system may have a small leak. If this result
is encountered check for leaks as previously
indicated and repair as necessary then repeat
evacuation.
• If pressure rises above 2000 microns, a leak is
present. Check for leaks as previously indicated
and repair as necessary then repeat evacuation.
1. Evacuate the system to 4000 microns and hold for 15
minutes. Then, break the vacuum with dry nitrogen,
bring the system pressure up to 2-3 PSIG, and hold for
20 min utes. Release the nitrogen,
2. Evacuate to 1500 microns and hold for 20 minutes.
Break the vacuum with dry nitrogen again, bring the
system pressure back up to 2-3 PSIG, and hold for 20
minutes.
3. Then, evacuate the system until it is below 500
microns and hold for 60 minutes.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9
10
PRESENT
MINUTES
V
ACUUM
IN
MICRONS
NO
NO
HIGH VOLTAGE!
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRIC
SHOCK
. W
IRING
MUST
CONFORM
WITH
NEC
OR
CEC
AND
ALL
LOCAL
CODES
. U
NDERSIZED
WIRES
COULD
CAUSE
POOR
EQUIPMENT
PERFORMANCE
,
EQUIPMENT
DAMAGE
OR
FIRE
.
WARNING
T
O
AVOID
THE
RISK
OF
FIRE
OR
EQUIPMENT
DAMAGE
,
USE
COPPER
CONDUCTORS
.
WARNING
GROUNDING REQUIRED!
ALWAYS
INSPECT AND USE PROPER SERVICE TOOLS. LACK OF
INSPECTION OR IMPROPER TOOLS MAY CAUSE EQUIPMENT
DAMAGE OR
PERSONAL INJURY
. ALL DISCONNECTED GROUNDING DEVICES MUST BE
RECONNECTED BEFORE INSTALLING OR SERVICING. MULTIPLE
COMPONENTS OF
THIS UNIT MAY CONDUCT ELECTRICAL CURRENT;
THESE ARE GROUNDED. IF SERVICING THE UNIT, ANY DISCONNECTION
OF GROUNDING WIRES, SCREWS, STRAPS, CLIPS, NUTS OR WASHERS
USED TO COMPLETE THE GROUND MUST BE RETURNED TO THEIR
ORIGINAL POSITION AND PROPERLY FASTENED.
CAUTION