York YCWS0313SC, Installation, Operation And Maintenance Manual, Page: 33 / 104

FORM 201.24-NM2
33
YORK INTERNATIONAL
COMMISSIONING
Preparation
Commissioning of this unit should only
be carried out by YORK Authorized
personnel.
The Microprocessor Based Control System (MBCS)
Operating Instructions must be read in conjunction
with this section.
The unit ‘ON/OFF’ toggle switch on the front of the
control panel has been set to the ‘OFF’ position at the
factory. This switch must remain in the ‘OFF’ posi-
tion, preventing running of the unit until commissioned
by YORK Authorized personnel. If the switch has been
set to the ‘ON’ position before commissioning then it
must be reported to YORK otherwise the warranty may
be invalidated.
Preparation – Power Off
The following checks should be made with the cus-
tomer supply/supplies to the unit switched off.
Inspection: Inspect unit for installation damage. If
found take action and/or repair as appropriate.
Refrigerant charge: Units are normally shipped as
standard with a full refrigerant operating charge. Check
that refrigerant pressure is present in both systems and
that no leaks are apparent. If no pressure is present a
leak test must be undertaken, the leak(s) located and
repaired. Repaired systems and units supplied with a
nitrogen holding charge must be evacuated with a suit-
able vacuum pump/recovery unit as appropriate to be-
low 100 microns.
Charging from the liquid connection
is necessary on R-22 to ensure the cor-
rect refrigerant mix is maintained.
Do not charge liquid refrigerant with static water in
the cooler. Care must also be taken to charge liquid
refrigerant slowly to avoid excessive thermal stress at
the charging point. Once the vacuum is broken, charge
into the condenser with the full operating charge as
given in Section 9.
Valves: Open the compressor suction and discharge and
liquid line service valves on both systems.
Compressor oil: The compressor oil level must be
between the two sight glasses on the oil separators.
Isolation/protection: Verify that all sources of electri-
cal supply to the unit are taken from point(s) of isola-
tion.
Control panel: Check the panel to see that it is free of
foreign materials (wire, metal chips, etc.) and clean out
if required.
Power connections: Check the customer power cables
are connected correctly. Ensure that connections of
power cables within the panels to the circuit breakers,
terminal blocks or switch disconnectors are tight.
Earthing: Verify that the units protective terminal(s)
are properly connected to a suitable earthing point. En-
sure that all unit internal earth connections are tight.
Compressor Motor Protector Module (-FMP) Cur-
rent Overloads: Check the factory setting of the cur-
rent overload trip value for each compressor motor:
Supply voltage: Verify that the site voltage supply cor-
responds to the unit requirement and is within the lim-
its given in Section 9.
SECTION 5
COMMISSIONING
REFRIGERANT
BREAK VACUUM RAISE SYSTEM
FROM BOTTLE PRESSURE TO
CONNECTION FOR: APPROXIMATELY:
R-22 LIQUID 4.6 BARG (70 PSIG)
YCWS
SYSTEM
107% FLA
AMP SET
SYS X SYS X MP DIP SWITCH SETTINGS ON
MOTOR INPUT -FMP LEFT = 1 RIGHT = 0
CURRENT VOLTAGE 1 6 3 1 8 4 2 1
= 100% = 125% 2 4 2 6
FLA FLA 8
0313 1 & 2 081 1.29 87 50 0 0 1 1 0 0 0 0
0373
1 081 1.29 87 50 0 0 1 1 0 0 1 0
2 103 1.64 110 64 0 1 0 0 0 0 0 0
0423 1 & 2 103 1.64 110 64 0 1 0 0 0 0 0 0
0503
1 103 1.64 110 61 0 0 1 1 1 1 0 1
2 130 2.07 139 81 0 0 1 1 1 1 0 1
0563 1 & 2 130 2.07 139 81 0 0 1 1 1 1 0 0
0613
1 130 2.07 139 81 0 0 1 1 1 1 0 1
2 155 2.47 166 96 0 1 1 0 0 0 0 0
0663 1 & 2 155 2.47 166 96 0 1 1 0 0 0 0 0
5