Technical data

4.22.1 Remote Mode Ready to Start Status
(RMR/S - TB4: terminals 26 & 27)
When closed, these contacts signify the control centre is
in "REMOTE" operating mode, allowing the energy
management system or the remote start/stop to control
the unit. Holding the Remote Stop Contact open, and
momentarily closing the Remote Start will now start the
unit.
4.22.2 Cycling Shutdown Status
(C/S - TB4: terminals 40 & 41)
When closed, these contacts signify the unit is not
permitted to start due to one or more cycling conditions.
The cycling shutdown contacts function in all operating
modes.
4.22.3 Safety Shutdown Status
(S/S - TB4: terminals 42 & 43)
When closed, these contacts signify the unit is not
permitted to start due to one or more safety controls. A
closure of the safety shutdown contacts means that the
operator must manually reset and restart the unit. Safety
shutdown contacts function in any operating mode,
remote, local and service.
4.22.4 System Operating Status
(RUN - TB5, terminals 35 & 36)
When closed these contacts signify that the unit is
operating.
4.23 Pump Control Connections
The control centre provides connections to allow
automatic control of both the chilled and condenser
water pumps.
4.23.1 Chilled Water Pump (CWP - TB4 terminals 44 & 45)
Internal volt free contacts between terminals 44 and 45
on TB4 can be used to control the pump starter via a
separate customer supply. The pump is started 30
seconds before compressor start and runs during
compressor operation, coast-down and during LWT
cycling shutdowns.
4.23.2 Condenser Water Pump Starter
(CPMSS - TB5, Terminals 2 & 24)
Connections are provided to allow automatic control of
the condenser water pump motor starter (CPMSS) by
the control centre. The pump motor starter holding coil
should be suitable for 115 Vac. The power requirement
for the pump motor starter and the compressor motor
starter must be a maximum of 2 amps holding and 10
amps inrush. If power requirement exceeds this, a
control relay of suitable rating should be used between
the unit and the pump starter.
4.24 Thermal Insulation
(See Product Drawings Form 160.47-PA1)
DO NOT field insulate until the unit has been
leak tested under the supervision of the York
representative.
Insulation of the type specified for the job, or minimum
thickness to prevent sweating of 0°C(30°F) surfaces
should be furnished (by others) and applied to the cooler
shell, end sheets, liquid feed line to flow chamber,
compressor suction connection, and cooler liquid heads
and connections. The liquid head flange insulation must
be removable, to allow head removal for the tube
maintenance. Details of areas to be insulated are given
on the Product Drawing.
Units are furnished factory anti-sweat insulated on order
at additional cost. This includes all low temperature
surfaces except the two (2) cooler liquid heads.
4.25 Installation Check
After the unit is installed, piped and wired the services of
a York representative should be requested to check the
installation and supervise the initial start-up and
operation on all chillers.
035L02381-GB0 4-11