System Outlet/Return Water Temperature Sensor - York 21RT-47RT Installation, Operation And Maintenance Manual

disconnection action value of the water flow switch shall be set to 60% of the rated water flow; In each module's
attached accessories package, there will be attached with one chilled-water flow switch. The module's water flow switch
is required to be installed on the evaporator's outlet pipe of each module (installed by the user), and its turn-off value has
been set before delivery.
 The flow switch can be installed in a vertical pipe whose direction of the horizontal pipe or the liquid flow is
upward, however it cannot be installed in a pipe whose direction of the liquid flow is downward. When it is
installed in the pipe whose direction of the liquid flow is upward, the problem of gravity shall be considered.
 The flow switch must be installed on a section of straight pipeline with at least five times of the pipe diameter
at both sides, and at the same time, it must be noted that the liquid flow's direction in the pipe must be in line
with the direction of the arrow on the controller
 Make sure the terminals of the flow switch are easy to wire. The wiring of the water flow switch shall adopt the
connection mode of normally open contact. Please do not misconnect it to the normally closed contact. The
signal line of the water flow switch shall be connected to the 1 # module by using the shield cable, and it shall
be linked with the unit
 It is important to select the right paddle according to the unit's rated flow, outlet pipe's diameter and paddle's
adjustment range of the flow switch (please refer to the instruction manual), and the paddle should not touch the
inner wall of the pipe and the other components in the pipe, otherwise it can easily cause the flow switch to fail
to conduct protection or reset normally
 For the temperature sensor of system's outflow-water & backwater and the water flow switch, see "Installation
Diagram of Water System" for their installation position
Caution:
 It is forbidden to set the system's water flow switch on the branch pipe inside the module or the main pipe
combined by multiple modules.
 Connect the total water flow switch signals of the system's evaporator and condenser to the main machine's
(1# module) main boards - DI12 and DI13
 Connect the water flow switch signals of each module's evaporator and condenser to each module's main
boards - DI1 and DI2
 The water flow switch is only a safety switch and it cannot be used to start and stop the unit
 The paddle shall be selected and cut on site, in order to make sure the paddle is located at the center of the
pipeline
 If each module in the water system is equipped with an electric two-way valve, the total water flow
switch of this water system is required to be short-circuited.

2.10. System outlet/return water temperature sensor

The installation position for water system's outflow-water and backwater temperature sensor is shown in
"Installation Diagram of Water System" , and they shall be installed to the pipe section of the total mixed outflow-water
and backwater pipe respectively, and they shall refer to the following installation instructions:
Caution: When there are two or more modules in the system, each module's inflow-water and backwater
temperature sensor must be installed on the inflow-water and backwater pipe of the corresponding module; The
system's inflow-water and backwater temperature sensor must be installed on water system's total inflow-water and
backwater pipe; For the heat recovery unit, the system backwater temperature sensor can be installed in the hot water
tank; The system's water-temperature control signal must be connected to the main machine (1# module).
Installation method of temperature sensor
 Punch a round hole on the backwater and outflow-water pipe, and the steel base which is attached along with
the unit shall be welded
 Install the copper water-temperature-sensor casing pipe (NPT threaded connection)
 Certain amount of heat transfer oil shall be injected into the casing pipe, and the temperature sensor shall be
installed. It is noted that no air and water are allowed in the casing pipe
 Screw and seal it with the threaded lock tightly
 Perform appropriate anti-rust surface treatment for the welding position and installation base
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Email: sales@cookeindustries.co.nz
Installation Requirements
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