Troubleshooting; Normal Operation - Lennox VRF V22B Series User Manual

Troubleshooting

ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD.
ever attempt to repair the indoor or outdoor unit yourself. System repairs must be performed by a licensed
professional HVAC technician (or equivalent).
If any of the following conditions exist, immediately turn the system (indoor and outdoor units) off at the unit
disconnect switch and call a licensed professional HVAC technician (or equivalent) for repairs:
• The system does not receive a signal from the remote control or wired controller.
• The remote control or wired controller indicate a system malfunction.
• Water is leaking into the room from the indoor unit.
• The circuit breaker trips or the fuse blows frequently.
• Water or some other liquid has been spilled on or splashed into the indoor unit.

NORMAL OPERATION

If none of the above conditions exist, check the
following items before calling for repairs. This can
save you both time and money. The follow ing are
signs of normal system operation.
System does not operate on command
The indoor fan does not start immediately after the ON/
OFF button on the remote control is pressed.
• On an initial call for cooling, the operation/run light is lit
to signal normal operation. There will be a delay after
a cooling demand is introduced be fore unit operation
begins. This delay protects the unit compressor and
is normal.
• When a heating demand is initiated, the opera tion
light is lit to signal normal operation. The PRE-DEF
indicator may be lit as well. The indoor unit fan will
not operate until the indoor coil reaches a pre-set
temperature. This prevents the delivery of cold air into
the space and is nor mal.
Indoor fan is on; compressor is off
In certain normal operating modes, the indoor fan is on
when the compressor is not operating.
• The system turns the compressor off and leaves the
indoor fan on when the indoor coil falls to a preset
temperature. This is normal operation and will prevent
the indoor coil from freezing.
• When the indoor fan is set for continuous opera tion,
the fan continues to run when the temperat ure setting
is reached and the compressor is de-energized.
WARNING
!
White mist comes out of the indoor unit
• During cooling operation, if the indoor relative
humidity is very high and the indoor unit dis charge
air louvers are very dirty, the indoor coil may freeze
and a white mist (frozen vapor) may appear to come
from the indoor unit. In this case, though the unit is
not in need of repair, it does need to be cleaned
by a licensed pro fessional HVAC technician (or
equivalent).
• During heating operation when the operation
mode switches from defrost to heating, mois ture
generated by the defrost process becomes steam and
may be seen as it is blown out of the indoor unit.
Sounds can be heard near the indoor unit
During certain parts of the heating or cooling pro cess,
low swishing or groaning sounds may be heard near the
unit as the system pressures equal ize. This is a normal
occurrence.
8