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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' position,
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 nitrogen holding charge. Repaired sys-
tems and units supplied with a nitrogen holding charge
must be evacuated with a suitable vacuum pump/re-
covery unit as appropriate to below 100 microns.
BREAK VACUUM
REFRIGERANT
FROM BOTTLE
CONNECTION FOR:
R-22
LIQUID
Charging from the liquid connection
is necessary on R-22 to ensure the cor-
rect refrigerant mix is maintained.
YORK INTERNATIONAL
SECTION 5
COMMISSIONING
Do not charge liquid refrigerant with static water in the
cooler. Care must also be taken to charge liquid refrig-
erant 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:
STAR DELTA OPEN TRANSITION STARTING –
200V/60 HZ
RAISE SYSTEM
PRESSURE TO
APPROXIMATELY:
70 PSIG (4.6 BARG)
0100 1 & 2
0120
0140 1 & 2
0180
0200 1 & 2
0220
0240 1 & 2
SYS X
SYS X MP
MOTOR
INPUT
CURRENT VOLTAGE
= 100%
= 125%
FLA
FLA
172
2.51
198
114
1
172
2.51
198
114
2
231
3.37
266
153
231
3.37
266
153
1
233
3.39
268
155
2
296
4.31
340
196
296
4.31
340
196
1
296
4.31
340
196
2
357
5.20
411
237
357
5.20
411
237
FORM 201.25-NM1 (302)
5
DIP SWITCH SETTINGS ON
-FMP LEFT = 1
RIGHT = 0
1
6 3
1
8
4
2
1
2
4 2
6
8
0
1
1
1
0
0
1 0
0
1
1
1
0
0
1 0
1
0
0
1
1
0
0 1
1
0
0
1
1
0
0 1
1
0
0
1
1
0
1 1
1
1
0
0
0
1
0 0
1
1
0
0
0
1
0 0
1
1
0
0
0
1
0 0
1
1
1
0
1
1
0 1
1
1
1
0
1
1
0 1
29
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