Johnson Controls York VCH 20A, Technical Information

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Fastening the indoor unit to the ceiling
When fastening, make sure it is completely horizontal, or
very slightly tilted towards the drain, so as to avoid possible
condensed water leaks (use a bubble level).
It is extremely important to be very careful with the support
of the indoor unit on the ceiling.
Make sure the ceiling is strong enough to support the weight
of the unit.
Before hanging, check the strength of each suspension bolt
installed.
Outdoor unit air ducts
1.- Connect the ducts, isolating them from the unit by means
of a flexible hose, preferably of non-flammable material, so
as to avoid the transmission of vibrations of the unit. If the
ducts are made of flexible material, they do not transmit
vibrations.
2.- On units VCH 45A, 60A, 75A and 90A, two different ducts
must be installed, one for each fan up to the discharge,
to avoid the recirculation of air.
3.- If the outdoor air coil air discharge is carried out through
the ducts, it is convenient to have the first 1-meter section
made of galvanized sheeting so as to avoid deterioration
due to a possible creeping of drops.
Indoor unit air ducts
1.- Connect the ducts, isolating them from the unit by means
of a flexible hose, preferably of non-flammable material,
so as to avoid the transmission of vibrations of the
unit.
If the ducts are made of flexible material, they do not
transmit vibrations.
2.- It is recommendable to install a damper at each by-pass
of the discharge duct for the purpose of carrying out a
correct balance of the system.
3.- Leave easy access for cleaning and changing the air
filters.
Drain connections, VCH 20 to 90A outdoor
unit
Install the drain pipes of each tray through a siphon.
The drain line must have a minimum slope of 2 cm. per each
metre in length.
The unit connections are made of copper piping with an
exterior diameter of 28.5.
Attention:
When the heat pump is operating at outdoor temperatures
of less than 5° C, the drain pipe could be obstructed due to
freezing.
So, if installed in exteriors, it is convenient to take this pos-
sibility into account, installing an electric heater at the drain
connection and around the antivibratory elements of the
compressor, connecting same electrically as per the dia-
grams herein.
Drain connections, VIR 25 to 90A indoor unit
It is necessary to connect a condensed water drain pipe to
the evaporating unit.
Install the drain pipe through a siphon.
Leave a minimum level difference of 25 mm. between
the height of the unit connection and the line after the si-
phon.
An access must be left so as to fill the siphon with water at
the beginning of each season.
The drain line must have a minimum slope of 2 cm. per each
metre in length.
Insulate the condensed water drain pipe so as to avoid leaks
and damaging the floor.
Drain pipe insulation
Insulate the condensed water drain pipe so as to avoid leaks
and damaging the floor.
Make sure water evacuation is being carried out correctly.
Interconnecting units
The installation of a unit comprises:
- Assembly of the unit.
- Connection of refrigerant pipes.
- Wiring of the unit.
When installing Split units, make sure the cooling circuit is
completely sealed after assembly, for the purpose of avoid-
ing leaks.
This will contribute to achieving maximum performance with
minimum consumption, and will avoid serious damage to the
unit. Furthermore, this is an ecological precaution.
Installation of interconnecting pipes
The length of the interconnecting pipes of the units should
be as short as possible.
The maximum admissible distances to the circuit and the
standard pipe diameter are indicated in the tables and
graphs below (without changing the pipe outlet diameter of
the units).
When there are horizontal sections of over 20 metres, it is
convenient to have the suction line tilt 2% in the direction of
the compressor.
- The maximum allowable flow in any section is 15 m/s.
- With the limitations indicated and without changing the
diameter of the outgoing unit pipes, no siphons are need-
ed.
- The liquid should have a minimum of 1° C of subcooling at
the intake of the expansion valve, so as to avoid accumula-
tion of gas in the ascending liquid lines before entering the
expansion system.