Modes Of Operation; Cold Mode; Heat Mode; General Instructions - York VCH 20A User Manual

1 User manual
1.4

Modes of operation

1.4 Modes of operation
The VCH/VIR range of air conditioning units includes different models. The operating mode for each one
varies depending on the specific model. The VCH units have two operating modes: heat or cold.

1.4.1 Cold mode

The VCH model circulates refrigerant gas (R-410A) through a cooling circuit driven by one or two
compressors (depending on models). The propelled gas circulates through an evaporator coil where it
absorbs ambient heat and evaporates. To liquefy the evaporated gas, it is then circulated through a
condenser coil where it releases the previously absorbed heat into the atmosphere.
To favour the evaporation and condensation of the refrigerant gas, the unit has supply and intake fans
that force the air through each of the coils. In the case of the evaporator, the fan pushes air to the inside
of the building or property through previously-installed distribution ducts. In the case of the condenser,
the fan pushes fresh air through the coil and then sends it back outdoors.
A series of filters remove dust particles and pollen, etc. from the air sent inside the building or property.

1.4.2 Heat mode

The VCH model can also reverse the cooling circuit operation so that the coils exchange functions and
send warm air to the inside of the building and the cold air outdoors.

1.4.3 General instructions

C A U T I O N
• Always keep the electrical power supply connected to the unit.
• Only disconnect the unit if it is not to be used for a long period of time.
• When preparing for seasonal use, connect the unit to the electricity supply at least 8 hours before
starting it.
False start the compressors (connect them just long
enough to make a few turns). To do so, use contactors
-KM1- and -KM2-.
Wait for 5 to 7 minutes and repeat the false start.
Wait another 5 to 7 minutes and perform a last false
start.
Then switch the compressors to full working order.
8
KM2 KM1