6
mounting and location instructions. For field-supplied
low voltage wiring and connections, see the last sec-
tion of this manual.
IMPORTANT: Hard start components are required
when single-phase reciprocating compressors are
used with indoor coils which have thermal expansion
valves. Some units have hard start components
factory installed. See the “Specification Sheet” for
hard start component requirements.
5. Check all factory wiring connections to ensure none
were loosened during shipping and handling.
IV. System Start-up
PRELIMINARY CHARGE ADJUSTMENT
IMPORTANT: If this unit has a crankcase heater (see the
wiring diagram or “Specification Sheet” shipped with unit),
connect electrical power to the unit for four hours before
operating the compressor. Failure to do so could result in
compressor damage.
IMPORTANT: During all installation and service work,
follow all regulations of the EPA. This system uses refrig-
erant R-22. R-22 is an HCFC (HydroChloro-FluoroCarbon).
It is a violation of EPA regulations to discharge HCFC into
the atmosphere doing so may result in fines or other
penalties.
After completing system piping, leak testing,and electrical
connecting, use an allen wrench to carefully open the
suction and liquid valves on the unit. These valves do not
back seat.
WARNING
To avoid personal injury or death, open
each valve only until it touches the retainer.
To avoid loss of refrigerant, do not apply
pressure to the retainer.
The outdoor unit is factory charged with enough R-22 for
the matching indoor blower coil or matching A coil plus 25
feet of 3/8 inch liquid line. Add or subtract 0.60 oz. of R-22
per foot of 3/8" liquid line for any difference from 25 feet.
For line sets over 50 feet consult an Amana distributor.
IMPORTANT: Use only refrigerant which is certified to
meet ARI Standard 700. Used refrigerant may cause
compressor damage, and will void the warranty. (Most
portable machines cannot clean used refrigerant well
enough to meet this ARI Standard.)
IMPORTANT: If adding refrigerant to a system, add only
refrigerant vapor (not liquid) through the suction valve (low
side) on the outdoor unit. Any other practice may cause
compressor damage.
FINAL CHARGE ADJUSTMENT - COOLING
OPERATION
Final charge adjustment must be performed when the
outdoor temperature is 60°F or higher:
1. Set the room thermostat to “COOL”.
2. Set the fan switch to “AUTO”.
3. Set the temperature control well below room tempera-
ture.
4. Turn the power on.
5. Let the system run for 15 - 20 minutes, or until
pressures are stabilized.
6. Measure the high side pressure from the liquid line
service valve port.
7. Measure the low side pressure from vapor line service
valve port (for superheat value at outdoor unit).
LIQUID LINE
SERVICE VALVE
VAPOR LINE
SERVICE VALVE
LOW SIDE
GAUGE PORT
Figure 4
ID COIL WITH EXPANSION VALVE:
At stabilized cooling conditions and with an outdoor tem-
perature of 60°F or higher, the system should have from
9°F to 13°F subcooling at the outdoor unit liquid line
service valve. If you have less than 9°F subcooling, add
charge. If you have more than 13°F subcooling, remove
charge.
ID COIL WITH ORIFICE:
For a proper superheat reading, measure the refrigerant
pressure and temperature at the outdoor unit vapor line
service valve. The superheat should be within 3°F of that
shown on the chart on page 8. If the superheat is higher,
add charge. If the superheat is lower, remove charge.
EXAMPLE: The low side pressure is 84 psi. The low side
temperature is 80°F. The outdoor temperature is 95°F.
The indoor temperature is 85°F. By referring to a pressure
temperature chart, you will see that 84 psi equals a
saturated temperature of 50°F. The superheat is 80 - 50
= 30°F. The chart shows a superheat of 20°F is ideal for
these conditions. Since our superheat is 30 - 20 = 10°F
higher than ideal, charge must be added.
