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System Start-Up And Refrigerant Charging; Digital - Fujitsu FO20R Series Installation Instructions Manual

Variable speed r-410a heat pump outdoor units
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4.11 Grounding
WARNING:
permanently grounded. Failure to do so can cause
electrical shock resulting in severe personal injury or
death.
A ground lug is provided near the line-voltage power
entrance for a ground wire.

5.0 SYSTEM START-UP AND REFRIGERANT CHARGING

5.1 System Start-Up
Overview
Once the system hardware and wiring has been
properly installed, the next step is to start the
system up, verify indoor air-flow, and adjust the
refrigerant charge. To assure optimum comfort,
efficiency, and reliability, it is extremely important to
follow the procedures in this section to assure the
indoor air-flow and refrigerant charge are correct.
5.2 Initial Power-Up
and Digital
Communication
Verification
After all installation steps have been completed,
apply electrical power to the indoor and outdoor
units. The Digital Control Center or thermostat
should be switched to the off position initially.
Within 45 seconds of power being applied, the
Digital Control Center should detect the indoor
and outdoor units. A "0" for Standby Mode will be
displayed on the Variable Speed Outdoor Control
(VSODC).
The unit must be
4.0 INSTALLATION
IMPORTANT:
to wait at least 12 hours after electrical power
is applied to the outdoor unit before starting
the compressor to assure any liquid refrigerant
inside the compressor has been driven out by the
compressor stator heat.
5.3 Digital Control
Center Set-Up
Follow the set-up instructions included with the
Digital Control Center prior to starting system.
Cooling dehumidification must be disabled for
indoor air-flow verification and refrigerant charging.
The indoor air-flow trim adjustment should be set
to 0% for indoor air-flow verification, but should
be adjusted prior to refrigerant charging should the
application require an adjustment to the indoor air-
flow.
Ground Lug
ST-A1241-01-X0
It is recommended
25

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