Johnson Controls York VCH 20A, Technical Information

Page: 16 / 72

16
Maintenance of the units
To assure proper operation of the units with minimum electric
consumption and a long operating life, a regular maintenance
schedule should be established.
The following table recommends the frequency of the usual
maintenance operations, although it may be necessary to
vary these, depending upon the operating and ambient
conditions of each unit.
Qualified technical personnel only should carry out mainte-
nance operations, updating the log of all maintenance.
Attention:
Prior to accessing the interior of the units discon-
nect all power supplies.
- Outdoor and indoor fan belts: Check belt conditions and
tension. If replaced with new belts, these should be of the
same type and gauge as the originals, and tension should
be checked within the next 24 hours of operation.
- Air filters: Slide them out of the units on their guide rails
and wash.
- Indoor coil: A visual inspection is recommended when
servicing the filters. The entire surface of the fins must be
kept free of dirt. If it requires cleaning, use a soft brush or a
vacuum cleaner, making sure not to damage the fins. Never
use water hoses in the interior of the compartment.
- Condensed water tray and siphon: Eliminate all dirt and
residues. Make sure the water drain and the siphon are not
obstructed. Make sure the water is evacuated correctly.
Prime the siphon (fill with water) if necessary.
- Outdoor coils: Eliminate all dirt and residues found on
the surface of both sides of the coils. Clean the surface
of the fins with a soft brush or a vacuum cleaner, making
sure not to damage them. Since the units are exposed to
the outdoor environment, it may be necessary to use water
and an detergent for cleaning. In this case, always apply
from inside to the exterior, and up and down.
- Outdoor air intake: If the unit includes any of the acces-
sories, such as an economizer or a return fan, the dampers
should be serviced by checking correct operation of their
components (shafts, fins, motor).
- Refrigerant circuit: At the beginning of each cooling and
heating season, check carefully: Operating pressures,
control elements, temperature variations, and carry out
any other checks needed.
- Mechanical and electrical operation: Also at the begin-
ning of each season, check the amperage of all motors,
the conditions of electrical connections and the operation
of the safety controls.
The bearings of both the indoor as well as the outdoor fan
motors are of the permanent lubrication type and require
no maintenance.
- Integrity of the structure and components of the unit:
Check the conditions of the outdoor structure and compo-
nents of the unit, the non-existence of impacts or dents
and correct fastening of the bolts.
Check correct closing of the access doors, including the
conditions of the sealing gaskets and the locks.
- Hot water coil: If the equipment is equipped with this
accessory: At the beginning of the heating season, check
the operation of the control elements, the water in the
system and the purging of air in the coil. Depending upon
the area and installation, and if necessary, make sure the
proportion of antifreeze is correct.
Frequency
1 month 2 months 6 months Annually
Belts (indoor/outdoor fans) X
Air filters X
Indoor coil (evaporator) X
Water tray and siphon X
Outdoor coils (condenser) X
Outdoor air intake (accessory) X
Refrigerant circuit X
Mechanical and electrical operation X
Structure and components integrity X
Hot water coil (accessory) X