Technical data

5 COMMISSIONING
The unit must be started by trained
personnel from an Authorised York
Service Centre. Failure to satisfy this
requirement will void the warranty.
The operations performed by York
service personnel are limited to unit
starting, and do not include other work on
system such as electrical connection,
water connection, etc. All other
preparatory work, including oil pre-
heating (for at least 12 hours) must be
performed by installer.
5.1 Preliminary Checks
The following operations must be performed
before starting the unit and should be performed
before York service personnel arrive.
n
With master isolating switch off, check that the
electrical terminal clamps are tight and that all
contactors operate correctly.
n Check that the voltage and phase unbalance
of the power supply is within limits, refer to
Section 4.
n
Connect (non-energised) contacts of the flow
switch and the pump thermal overload cut-out
or other devices (where provided) to terminals
1-2 and 3-4 respectively.
n
Check that the evaporator and condenser
external water circuit components (pumps,
sensors, user equipment, filters, expansion
tank and reservoir where provided) have been
correctly installed as advised by
manufacturer.
n
Check that the external water circuits are full
and that the fluid circulates freely with no signs
of leakage or air bubbles. If ethylene glycol
antifreeze is used, check that the percentage
concentration is correct.
n
Check that the pump direction of rotation is
correct, and allow fluid to circulate for at least
24 hours (12 hours for each pump). Then
clean the basket filters on the pump suction.
n
Adjust the water system so that the flow rates
are as specified.
n
Check that the water quality is as specified.
n
Check that the oil heaters, have been
energised for at least 12 hours.
5.2 Refrigerant Charging YCRM Units
Units are supplied with a nitrogen holding
charge.This should be relieved carefully via the
suction service connections and the liquid line
service connections.
The unit should be evacuated with a suitable
vacuum pump/recovery unit as appropriate to
below 100 microns.
Do not liquid charge with static water in any of the
heat exchangers. Care must also be taken to liquid
charge slowly to avoid excessive thermal stress at
the charging point. Once the vacuum is broken,
charge the unit with the full operating charge as
given in the Physical Data section of this manual.
Check the unit data plate and/or unit labels for the
type of refrigerant to be used with the unit.
5.3 Starting
The starting sequence is as follows.
n
Turn on the master isolating switch (12 hours
before).
n
Check that the compressor oil is sufficiently
warm (minimum temperature at the oil pan
exterior must be approximately 40°C) and that
the auxiliary control circuit is energised.
n
Check that all external equipment is in running
order and that the associated control
equipment is correctly calibrated.
n
Start the liquid pump and check that the water
flow rate is as required.
n
Set the desired fluid inlet temperature on the
control panel (refer to Section 6).
n
Start the unit (refer to Section 6).
035B40022-000 5-1