Specifications

85
JOHNSON CONTROLS
Form 201.28-NM1.EN.PED/CE (0211)
9
GENERAL REQUIREMENTS
The units have been designed to operate continuously,
provided they are regularly maintained and operated
within the limitations given in this manual. Each
unit should be included in a routine schedule of daily
maintenance checks by the operator/customer, backed up
by regular service inspection and maintenance visits by a
suitably qualified Service Engineer.
It is entirely the responsibility of the owner to provide
for these regular maintenance requirements and/or enter
into a maintenance agreement with a Johnson Controls
service organization to protect the operation of the unit.
If damage or a system failure occurs due to improper
maintenance during the warranty period, Johnson
Controls shall not be liable for costs incurred to return
the unit to satisfactory condition.
This “Maintenance” section applies to the
basic unit only and may, on individual
contracts, be supplemented by additional
requirements to cover any modifi cations or
ancillary equipment as applicable.
The “Safety” section of this manual should
be read carefully before attempting any
maintenance operations on the unit.
Weekly Maintenance
The following maintenance checks should be carried
out on a weekly basis by the operator/customer. Please
note that the units are not generally user serviceable
and no attempt should be made to rectify faults or
problems found during daily checks unless competent
and equipped to do so. If in any doubt, contact your local
Johnson Controls Service Agent.
Unit Status
Press the ‘STATUS’ key on the keypad and ensure no
fault messages are displayed.
SECTION 9 - MAINTENANCE
Refrigerant Leaks
Visually check the heat exchangers, compressors and
pipework for damage and gas leaks.
Operating Conditions
Read the operating pressures and temperatures at the
control panel using the display keys and check that these
are within the operating limitations given in the manual.
Compressor Oil Level
Check each system oil level after the compressor has
been operating at “Full Load” for approximately 15 to
30 minutes. The oil level should be between the bottom
of the upper sight glass and the top of the lower sight
glass on the oil separator.
Refrigerant Charge
Assure there is a level of refrigerant in the evaporator sight
glass while running at “Full Load” for 15 minutes.
Adding Charge to a System
A sight glass is located in the evaporator. When
optimally charged after running full load, the refrigerant
level should be approximately in the center of the sight
glass. There should be little concern if the level is high
or low in the glass, it should not affect operation.
It is not necessary to weigh charge unless
the entire charge has been lost. The ease of
charging is possible since the microchannel
coils hold only a small amount of refrigerant
charge. A charging valve, located between
the fi xed orifi ce and the evaporator, may
be used if charge adjustment is required.
Charge should be added as liquid. If the
complete charge needs to be added, see
the Refrigerant Removal, Evacuation and
Charging procedure in this section. Use
the valve on the liquid line for adding the
full charge and open the valves per the
procedure.