FORM 201.25-NM1 (302)
29
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’ 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.
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 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:
SECTION 5
COMMISSIONING
REFRIGERANT
BREAK VACUUM
RAISE SYSTEM
FROM BOTTLE
PRESSURE TO
CONNECTION FOR:
APPROXIMATELY:
R-22
LIQUID
70 PSIG (4.6 BARG)
STAR DELTA OPEN TRANSITION STARTING –
200V/60 HZ
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
0100
1 & 2
172
2.51
198
114
0
1 1 1 0
0 1 0
0120
1
172
2.51
198
114
0
1 1 1 0
0 1 0
2
231
3.37
266 153 1
0 0 1 1
0 0 1
0140
1 & 2
231
3.37
266 153 1
0 0 1 1
0 0 1
0180
1
233
3.39
268 155 1
0 0 1 1
0 1 1
2
296
4.31
340 196 1
1 0 0 0
1 0 0
0200
1 & 2
296
4.31
340 196 1
1 0 0 0
1 0 0
0220
1
296
4.31
340 196 1
1 0 0 0
1 0 0
2
357
5.20
411 237 1
1 1 0 1
1 0 1
0240
1 & 2
357
5.20
411 237 1
1 1 0 1
1 0 1
YCRS
SYSTEM
AMP SET
115% FLA
5
