Unit wiring
1. This wiring diagram describes the standard electronic control scheme for use with a YORK
Variable Speed Drive (VSD).
2. Field wiring to be in accordance with the National Electrical Code (NEC) and all other applicable
codes and specifications. Refer to
161.01-PW3
for field connections.
CAUTION
Field wiring contacts may have voltage present when power is removed. Field wiring contacts could be
connected to external power sources.
3. Numbers along the left side of the diagram are line identification numbers. The number along
the right side indicates the line number location of relay contacts. An underlined contact
location signifies a normally closed contact.
4. Main Control Panel Class 1 Field Wiring Terminal connection points are indicated by numbers
within a rectangle. Main Control Panel Factory Wiring Terminal connection points are indicated
by numbers within a triangle. Component terminal markings are indicated by numbers within
a circle. Numbers adjacent to circuit lines are the circuit identification numbers.
Table 1: Connection points
Connection point
Example
Main Control Panel Class 1 Field Wiring Terminal
Main Control Panel Factory Wiring Terminal
Component terminal markings
5. To cycle unit ON and OFF automatically with contacts other than those shown, install a cycling
device between terminals 1 and 13 (Line 38) (see Note 7). If a cycling device is installed, the
jumper must be removed between terminals 1 and 13.
6. A remote run-stop switch may be connected to terminals 1 and 7 (Line 32) (see Note 7).
Remote run-stop switch (Line 32) is operative only in the “Remote” operating mode.
7. Device contact rating to be 5 mA at 115 VAC.
8. Contact rating is 5 A resistive at 120 VAC or 240 VAC.
9. For wiring diagrams of the VSD, refer to the YZ service manual
161.01-M3.
7
Unit Wiring and Field Connections for YZ Centrifugal Chiller with Magnetic Bearing Controller
