37JOHNSON CONTROLS
FORM NO.: 6U6K-B01E-NB-EN
SECTION 4 – INSTALLATION
CIRCUIT BREAKER
The handle of the circuit breaker is installed on the door of the
control panel. The circuit has to be switched off before opening
the door.
EMERGENCY CUTOUT BUTTON
Immediate shutdown of the unit can be accomplished by
pressing a factory-installed emergency button to break the
electrical circuit of the control system. The red button is
installed on the door of the control panel or HMI panel.
COMPRESSOR HEATERS
Compressor heaters are standard. All compressors utilize two
heaters with 40 W each.
If the unit is powered on for the first time, the crankcase
heaters must be energized for at least 8 hours prior to restarting
a compressor. This will assure that liquid slugging and oil
dilution does not damage the compressors on start.
BPHE AND PIPING HEATERS
Heat exchanger and piping heaters will be switched on in
standby mode when air temperature is below 3 °C. The purpose
is to prevent water temperature drop below freezing point.
DUAL PRESSURE RELIEF VALVES
Relief valves are located on both the high and low pressure side
of the piping. High side relief valve pressure setting is 44.8 bar.
Low side relief valve pressure setting is 29 bar.
Dual relief valves are standard conguration for YMAA/ YMPA
series, with shut off valves to change individually without
decanting system.
PRESSURE CUTOUT
One high pressure cutout and two low pressure cutouts (one
LP cutout for cooling only unit) are installed in the discharge
and suction piping of each system. The HP cutout opens at
4.03 MPa (585 PSIG) and closes at 3.1 MPa (450 PSIG). The
cooling LP cutout opens at 0.3 MPa (44 PSIG) and closes at 0.5
MPa (73 PSIG). The heating LP cutout opens at 0.15MPa (22
PSIG) and closes at 0.3 MPa (44 PSIG).
WIRE CONTROLLER
Dual HMI is available on YMAA/YMPA. Once the function is
activated, the chip will automatically overwrite the memory by
the latest settings sent from either of the controllers.
SC-EQUIPMENT COMMUNICATION CARD
The SC-EQ (Smart Chiller Equipment) Communication Card
is an economical and versatile communications device that
provides a communication connection between the unit and
standard open BAS protocols. It efciently manages all of the
communication protocols used by York equipment, exposing
the data in a consistent, organized, and dened fashion.
The SC-EQ Communication Card is available as a card that
is already tted directly inside the control panel. The SC- EQ
detects the model of the unit and the BAS protocol and then
automatically congures itself to communicate with both.
FIGURE 19 – DUAL PRESSURE RELIEF VALVES
Cooke Industries - Phone: +64 9 579 2185 Email: sales@cookeindustries.co.nz Web: www.cookeindustries.co.nz
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