York ZT SERIES - Control Wire Sizes; Typical Control Wiring

6021980-UIM-A-1120
24 Johnson Controls Ducted Systems
Thermostat wiring
Install the thermostat on an inside wall approximately 56 inches
above the floor. The thermostat must not be subject to drafts,
sun exposure, or heat from electrical fixtures or appliances.
Follow the manufacturer's instructions enclosed with thermostat
for the general installation procedure. Use color-coded,
insulated wires to connect the thermostat to the unit. See Table
11 for control wire sizing and maximum length.
Typical control wiring detail
Figure 21: Typical control wiring
Table 11: Control wire sizes
Wire size Maximum length
1
20 AWG < 150 feet
18 AWG 150-250 feet
16 AWG 250-500 feet
1. From the unit to the thermostat and back to the unit.
OCC
C
RC
G
Y2
Y3
Y3
Y1
W2
W1
X
R
THERMOSTAT
TERMINALS
CONTROL
TERMINAL
BLOCK
TERMINALS ON A
LIMITED NUMBER
OF THERMOSTATS
1
4
3
1
2
4
Second stage heating not required on single stage heĂƟŶg units.
Jumper is required if there is no Smoke Detector circuit.
Jumper is required for any combination of R, RC, or RH.
5
5
OCC is an output from the thermostat to indicate the Occupied ĐŽŶĚŝƟon.
X is an input to the thermostat to display Error Status conditions.
3
W2
Y1
G
OCC
Y2
X
R
SD-24
C
W1
2
24V
C
24 VAC
Class 2
SD-24
Jumper Located on Harness
Smoke
Detector
SD-R
24V Output
R
(If No Smoke Detector)
(If Smoke Detector Is Used)
R~Occ Jumper:
Smart Equipment Control boards come from the
factory with a jumper wire between R and OCC
terminals on the thermostat terminal strip. Failure
to remove this jumper will place the unit into the
Occupied mode no matter what the occupancy
demand is from the thermostat or EMS system.
To allow Thermostat or EMS control of the
Occupied mode for the unit, this jumper must be
removed during commissioning.
EXPANSION BOARD
TERMINAL BLOCK