Technical data

4.21.5 Safety Shutdown
(TB2 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 all operating modes.
4.22 Pump Control Connections
The control panel provides connections to allow
automatic control of both the chilled and cooling liquid
pumps.
4.22.1 Chilled Liquid Pump
(TB2 terminal 45 & TB6 terminal 2)
Connections are provided to allow automatic control of
the chilled water pump motor starter by the control
panel. The pump motor starter holding coil should be
suitable for 115 Vac. The power requirement for the
pump motor starter must be a maximum of 2 amps
inductive. If power requirement exceeds this, a control
relay of suitable rating should be used between the unit
and the pump starter.
4.22.2 Cooling Liquid Pump
(TB2 terminal 151 & TB6 terminal 2)
Connections are provided to allow automatic control of
the cooling water pump motor starter by the control
panel. The pump motor starter holding coil should be
suitable for 115 Vac. The power requirement for the
pump motor starter must be a maximum of 1 amp
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.
4.23 Thermal Insulation
(See Product Drawings Form 160.81-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
evaporator shell, end sheets, liquid feed line to flow
chamber, compressor suction connection, and
evaporator 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) evaporator liquid heads.
4.24 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.
160.81-ICOM-GB0 (01/02) 4-9