York YCWS0313SC, Installation, Operation And Maintenance Manual, Page: 32 / 104

YORK INTERNATIONAL
32
CONNECTION DIAGRAM LEGEND AND NOTES
LEGEND
DESIGNATION DESCRIPTION
PWMC PULSE WIDTH MODULATED CURRENT
PWMT PULSE WIDTH MODULATED TEMPERATURE
- QCB CIRCUIT BREAKER
- QCSD CONTROL CIRCUIT SWITCH
DISCONNECTOR
/ESD / EMERGENCY STOP DEVICE
- QCSISD COMMON SUPPLY INPUT SWITCH
DISCONNECT
- QRESB REMOTE EMERGENCY STOP BUTTON
- QSDF SWITCH DISCONNECT FUSED
SA SYSTEM ALARM
- SF FLOW SWITCH
- XVFT VOLTAGE FREE TERMINAL BLOCK
DESIGNATION DESCRIPTION
- ACRB CUSTOMER RELAY BOARD
- AIOB INPUT OUTPUT BOARD
- AMB MICROPROCESSOR BOARD
- APB POWER BOARD
- ARCR REMOTE CURRENT RESET
- ARTR REMOTE TEMPERATURE RESET
CLP CHILLED LIQUID PUMP
CRS COMMON RUN SIGNAL
CSI COMMON SUPPLY INPUT
PE PROTECTIVE EARTH
PNT PRINT
PS POWER SECTION
NOTES
NB NOTES
2 This port can be used for a printer - see Microprocessor Based Control System Operating Instructions for
warnings and limitations on use for this port.
10 A. PE connection for standard units when common supply input accessory is not installed.
B. PE connection for units with common supply input accessory installed.
12 For remote emergency stop button (-QRESB) facility, remove link WLK1, and connect contact across terminals 3
and 4.
13 All wiring to power section voltage free contacts requires a supply provided by the customer maximum voltage
240V. The customer must take particular care when deriving the supplies for the voltage free terminals with
regard to a common point of isolation. Thus, these circuits when used must be fed via the common point of
isolation. The voltage to these circuits is removed when the common point of isolation to the unit is opened. This
common point of isolation is not supplied by YORK. The YORK voltage free contacts are rated at 125VA. All
inductive devices (relays) switched by the YORK voltage free contacts must have their coil suppressed using
standard R/C suppressors.
14 To obtain a system alarm signal, connect live to terminal 1 and use terminal 8 for No. 1 system alarm and
terminal 7 for No. 2 system alarm.
15 Wire terminals 5 and 6 to chilled liquid pump starter, so that when the circuit between 5 and 6 is closed, the
pump must run. Contact can be used as master start/stop for pump when daily schedule test.
16 Wire terminals 3 and 4 to indicate that any systems are running. For YCWS products, contacts may be wired to
condenser pump/fan starter, so that when the circuit between 3 and 4 is closed the pump/fan must run.
18 CE units with transformer kit
19 No controls (relays etc.) should be mounted in any section of the control panel. Additionally, control wiring not
connected to the YORK control panel should not be run through the panel. If these precautions are not followed,
electrical noise could cause malfunctions or damage to the unit and its controls.
20 For single-point supply connect as shown enclosed detail. Overriding the STD. connections.
21 Use gland plate on back of logic section to avoid power cables. The voltage free contacts must be suitable for
30VDC (gold contacts recommended). If voltage free contact forms part of a relay or contactors, the coil of this
device must be suppressed by the customer using a standard R/C suppressor. The above precautions must be
taken to avoid electrical noise which could cause a malfunction or damage to the unit and its controls.
22 Connect chilled liquid flow switch as shown to provide adequate protection against loss of flow.
Installation