Service manual
SERVICING
35
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 package
models and remote cooling models.
WARNING
Disconnect Electrical Power Supply:
1. Remove field connected low voltage wires from control
terminals.
2. In ambient temperatures below 60°F, set the knob to
correspond 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 differen-
tial 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
ALWAYS REMOVE THE REFRIGERANT CHARGE 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
moisture 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
prevent 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 in-
stalled between the partition panel and the expansion de-
vice.
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). Rec-
ommended 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
exploring tube of the detector as close to the tube as pos-
sible, check all piping and fittings. If a leak is detected, do
not attempt to apply more brazing to the joint. Remove and
capture 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
system.
Air in a system causes high condensing temperature and
pressure, resulting in increased power input and reduced
performance.
Moisture chemically reacts with the refrigerant and oil to
form corrosive hydrofluoric and hydrochloric acids. These
attack motor windings and parts, causing breakdown.