Page 10
# 504,910M
START-UP
1. Rotate fan to check for frozen bearings or binding.
2. Inspect all factory and field-installed wiring for loose
connections.
3. Open liquid line and suction line service valves to
release refrigerant charge (contained in outdoor unit)
into system. Replace and tighten caps. Use a backup
wrench on the suction and liquid valves when remov-
ing or replacing valve caps.
4. To open suction valve, remove hex cap and turn valve
stem fully open using an Allen (hex) wrench. To open
liquid valve, remove cap and turn valve stem until it is
fully open.
NOTE:
When replacing valve caps, the caps should
be finger tight then tightened an additional 1/6 of a
turn.
5. Check voltage supply at the disconnect switch. the
voltage must be within the range listed on the unit
nameplate. If not, do not start equipment until the
power company has been consulted and the voltage
condition corrected.
6. Set thermostat for cooling demand, turn on power to
indoor blower and close the outdoor unit disconnect
switch to start the unit.
7. Recheck unit voltage with unit running. Power must be
within range shown on unit nameplate. Check amper-
age draw of unit. Refer to unit nameplate for correct
running amps.
Charging
This system is charged with R410A refrigerant which
operates at much higher pressures than R22. The liquid line
drier provided with the unit is approved for use with R410A.
Do not replace it with one designed for use with R22.
This
unit is NOT approved for use with coils which use
capillary tubes as a refrigerant metering device.
Factory Charge
Units are factory charged with the amount of R410A
refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with 15'
line set. For varying lengths of line set, refer to Table 4 for
refrigerant charge adjustment.
4. Open both manifold valves and start vacuum pump.
5. Evacuate the line set and indoor unit to an absolute
pressure of 23mm (23,000 microns) of mercury
(approximately 1 in. of mercury). During the early
stages of evacuation, it is desirable to close the
manifold gauge valve at least once to determine if
there is a rapid rise in absolute pressure. A rapid rise
in pressure indicates a relatively large leak. If this
occurs, the leak testing procedure must be repeated.
NOTE
– The term
absolute pressure
means the total
actual pressure with a given volume or system, above
the absolute zero of pressure. Absolute pressure in a
vacuum is equal to atmospheric pressure minus
vacuum pressure.
6. When the absolute pressure reaches 23mm of
mercury, close the manifold gauge valves, turn off the
vacuum pump, and disconnect the manifold gauge
center port hose from the vacuum pump. Attach the
manifold gauge center port hose to a nitrogen cylinder
with pressure regulator set to 150 psig and purge the
hose. Open the manifold gauge valves to break the
vacuum in the line set and indoor unit. Close the
manifold gauge valves.
7. Shut off the nitrogen cylinder and remove the manifold
gauge hose from the cylinder. Open the manifold
gauge valves to release the nitrogen from the line set
and indoor unit.
8. Reconnect the manifold gauge to the vacuum pump,
turn the pump on, and continue to evacuate the line
set and indoor unit until the absolute pressure does
not rise above .5mm (500 microns) of mercury within
a 20-minute period after shutting off the vacuum
pump and closing the manifold gauge valves.
9. When the absolute pressure requirement above has
been met, disconnect the manifold hose from the
vacuum pump and connect it to an upright cylinder of
R410A refrigerant. Open the manifold gauge valves to
break the vacuum in the line set and indoor unit.
Close manifold gauge valves and shut off R410A
cylinder and remove manifold gauge set.
Mineral oils are not compatible with R410A. If
oil must be added, it must be a polyol ester oil.
IMPORTANT