Control Wire Sizes; Typical Low Voltage Field Wiring - York ZK Series Installation Manual

Thermostat Wiring
A two stage thermostat must be used and should be located on
an inside wall approximately 56 inch above the floor where it will
not be subject to drafts, sun exposure or heat from electrical
fixtures or appliances. Follow the manufacturer's instructions
enclosed with thermostat for general installation procedure.
Color-coded, insulated wires should be used to connect the
THERMOSTAT
TERMINALS
W1
W2
1
Y1
Y2
G
R
3
C
RC
4
OCC
5
X
TERMINALS ON A
LIMITED NUMBER
OF THERMOSTATS
S4
-
1)
RAH
+
2)
-
3)
DCT
+
PRS
4)
Second stage
1
2 Jumper is required if there is no Smoke Detector circuit.
Jumper is required for any co
3
OCC is an output from the thermostat to indicate the Occupied
4
5 X is an input to the thermostat to display Error Status condi ons.
Figure 22: Typical Low Voltage Field Wiring
Johnson Controls Ducted Systems
TB4-3
823/R 24V
COM
824/BK
OUT
825/W
ot required on single stage he g units.
of R, RC, or RH.
thermostat to the unit. Refer to Table 8 for control wire sizing
and maximum length.
Table 8: Control Wire Sizes
Wire Size
18 AWG
1. From the unit to the thermostat and back to the unit.
R~Occ Jumper:
CONTROL
TERMINAL
Smart Equipment Control boards come from the
BLOCK
factory with a jumper wire between R and OCC
terminals on the thermostat terminal strip. Failure
W1
to remove this jumper will place the unit into the
Occupied mode no matter what the occupancy
W2
demand is from the thermostat or EMS system.
Y1
To allow Thermostat or EMS control of the
Occupied mode for the unit, this jumper must be
G
removed during commissioning.
Y2
OCC
X
R
SD-24
C
C
24V
SD-24
SD-R
R
Return or Space Humidity
Sensor (0-10VDC)
on.
5566228-BIM-A-0818
Maximum Length
Smoke
Detector
24 VAC
Class 2
2
Jumper Located on Harness
(If Smoke Detector Is Used)
(If No Smoke Detector)
24V Output
1
150 Feet
19