SERVICING
50
3. Using an ohmmeter, test the element for continuity - no
reading indicates the element is open. Replace as nec-
essary.
See "Electric Heater" in the Product Design Section to verify
heater amperage and temperature rise.
S-53 OUTDOOR TEMPERATURE CONTROL
(OPTIONAL ITEM)
ATK01
This kit includes an ambient thermostat mounted in
a weatherproof box for installation exterior to the unit. This
kit is used for ambient control on all Amana
®
brand package
models and remote cooling models.
WARNING
D
ISCONNECT ELECTRICAL POWER SUPPLY.
1. Remove field connected low voltage wires from control
terminals.
2. In ambient temperatures below 60°F, set the knob to cor-
respond with the actual temperature of the control.
3. Using an ohmmeter, test for continuity between the con-
trol terminals. It should not test continuous. The control
is designed to open at this point with a manual differential
of approximately 4°F.
4. In ambient temperatures above 60°F., it will be neces-
sary to chill the control.
OUTDOOR TEMPERATURE CONTROL
S-100 REFRIGERATION REPAIR PRACTICE
DANGER
A
LWAYS REMOVE THE REFRIGERANT CHANRGE IN A PROPER MANNER
BEFORE APPLYING HEAT TO THE SYSTEM.
When repairing the refrigeration system:
1. Never open a system that is under vacuum. Air and mois-
ture will be drawn in.
2. Plug or cap all openings.
3. Remove all burrs and clean the brazing surfaces of the
tubing with sand cloth or paper. Brazing materials do not
flow well on oxidized or oily surfaces.
4. Clean the inside of all new tubing to remove oils and pipe
chips.
5. When brazing, sweep the tubing with dry nitrogen to pre-
vent the formation of oxides on the inside surfaces.
6. Complete any repair by replacing the liquid line drier in
the system, evacuate and charge.
At any time the system has been open for repair, a liquid line
filter dryer must be installed. The dryer should be installed
between the partition panel and the expansion device.
Heat pump models will require a bi-flow dryer.
BRAZING MATERIALS
Copper to Copper Joints
- Sil-Fos used without flux (alloy
of 15% silver, 80% copper, and 5% phosphorous). Recom-
mended heat 1400°F.
Copper to Steel Joints
- Silver Solder used without a flux
(alloy of 30% silver, 38% copper, 32% zinc). Recommended
heat - 1200°F.
S-101 LEAK TESTING
Refrigerant leaks are best detected with a halide or elec-
tronic leak detector.
However, on outdoor installed systems, provisions must be
made to shield the copper element of an halide torch from
the sun and wind conditions in order to be able to see the
element properly.
NOTE:
The flame of the halide detector will glow green in the
presence of R-22 refrigerant.
For a system that contains a refrigerant charge and is sus-
pected of having a leak, stop the operation and hold the ex-
ploring tube of the detector as close to the tube as possible,
check all piping and fittings. If a leak is detected, do not
attempt to apply more brazing to the joint. Remove and cap-
ture the charge, unbraze the joint, clean and rebraze.
For a system that has been newly repaired and does not
contain a charge, connect a cylinder of refrigerant, through a
gauge manifold, to the liquid and suction line dill valves and/
or liquid line dill valve and compressor process tube.
NOTE:
Refrigerant hoses must be equipped with dill valve
depressors or special adaptor used. Open the valve on the
cylinder and manifold and allow the pressure to build up within
the system. Check for and handle leaks, as described above.
After the test has been completed, remove and capture the
leak test refrigerant.
S-102 EVACUATION
This is the most important part of the entire service proce-
dure. The life and efficiency of the equipment is dependent
upon the thoroughness exercised by the serviceman when
evacuating air (non-condensable) and moisture from the sys-
tem.
Air in a system causes high condensing temperature and
pressure, resulting in increased power input and reduced per-
formance.
