Maytag Amana VZC20, Installation & Service Reference

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8
WARNING
REFRIGERANT UNDER PRESSURE!
Failure to follow proper procedures may cause property
damage, personal injury or death.
NOTE: Scroll compressors should never be used
to evacuate or pump down a heat pump or air
conditioning system.
CAUTION
Prolonged operation at suction pressures less than 20 psig
for more than 5 seconds will result in overheating of the
scrolls and permanent damage to the scroll tips, drive
bearings and internal seal.
Deep Vacuum Method (Recommended)
The Deep Vacuum Method requires a vacuum pump
rated for 500 microns or less. This method is an effective
and efficient way of assuring the system is free of non-
condensable air and moisture. As an alternative, the Triple
Evacuation Method is detailed in the Service Manual for
this product model.
It is recommended to remove the Schrader Cores from the
service valves using a core-removal tool to expedite the
evacuation procedure.
1. Connect the vacuum pump, micron gauge, and
vacuum rated hoses to both service valves.
Evacuation must use both service valves to eliminate
system mechanical seals.
2. Evacuate the system to less than 500 microns.
3. Isolate the pump from the system and hold vacuum
for 10 minutes (minimum). Typically, pressure will rise
slowly during this period. If the pressure rises to less
than 1000 microns and remains steady, the system is
considered leak-free; proceed to system charging and
startup.
4. If pressure rises above 1000 microns but holds steady
below 2000 microns, non-condensable air or moisture
may remain or a small leak is present. Return to step
2: If the same result is achieved check for leaks and
repair. Repeat the evacuation procedure.
5. If pressure rises above 2000 microns, a leak is
present. Check for leaks and repair. Repeat the
evacuation procedure.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9 10
LEAK(S)
PRESENT
MINUTES
V
ACU
UM
IN
MI
CR
O
NS
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
ELECTRICAL CONNECTIONS
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!
A
LWAYS INSPECT AND USE PROPER SERVICE TOOLS
. L
ACK OF
INSPECTION OR IMPROPER TOOLS MAY CAUSE EQUIPMENT DAMAGE OR
PERSONAL INJURY
. A
LL DISCONNECTED GROUNDING DEVICES
MUST
BE
RECONNECTED BEFORE INSTALLING OR SERVICING
. M
ULTIPLE
COMPONENTS OF THIS UNIT MAY CONDUCT ELECTRICAL CURRENT
;
THESE ARE GROUNDED
. I
F 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