Honeywell Unitary Series - Power Wiring Examples; Grounding

HONEYWELL UNITARY INSTALLATION INSTRUCTIONS-24 VAC/VDC
13 31-00614-01
Power Wiring Examples
Fig. 12 Power Wiring Examples
CAUTION
CAUTION
Risk of Electric Shock: More than one disconnect switch may be required to de-energize the equipment
before servicing. To Reduce the Risk of Fire or Electric Shock, Do Not Interconnect the Outputs of Different
Class 2 Circuits.
Grounding
Building earth ground ( ) is a functional grounding, and it does not offer shock protection from a hazardous
voltage. Connect the building earth ground ( ) terminal to the panel ground using the proper cable as shown
above. Ensure that the panel ground connects to a known earth ground.
RS485
1
+
-
WM1 / 2 IO1 C IO2 IO3 C IO4 IO5 C IO6 IO7 C IO8
C IO9 C IO11 C IO12
COM
RS485 1
SYLK
UIO
24VDC
OUT
24VDC
OUT
IO1
POWER 24V
NC1NO1 IN1 NC2 NO2 IN2
NC3NO3 IN3 NC4NO4 IN4
DO RELAY
644645 47 48 49 50 51 52 53 55 56 57 58 59 61 62 63 65 66 67 68 69 71 7254 6 7
4321 56789 11121314151
24VDC
OUT
UIO
IO13 C IO14IO15 C IO16
32 33 34 35 36 37 38
V
PORT1 PORT2
10/100 SWITCHED
DO SSR
AUX
OUT
SRIN SR3 SR4CSR1 SR2C
16 17 18 19 21 22 232
644645 47 48 49 50 51 52 53 55 56 57 58 59 61 62 63 65 66 67 68 69 71 7254 6 7
4321 56789 11121314151 32 33 34 35 36 37 38
16 17 18 19 21 22 232
UL Listed Class 2
Transformer
Max. 100 VA
120/240
VAC
Unitary controller
COM
24 VAC / VDC
Earth
Ground
1
1
WHEN CONNECTING POWER TO THE UNITARY CONTROLLERS, CONNECT
THE COM OF THE VAC SECONDARY CIRCUIT TO A KNOWN EARTH GROUND.
UL Listed Class 2
Transformer
120/
240 VAC
3
2
1
V0
COM
24 VAC / VDC
Earth
Ground
1
120/
240 VAC
M
Power wiring example for one controller per transformer
Controller transformer and field device transformer wiring
AC OUT
17
16
SR IN
20
19
18
SR1
C
SR2
Max. 100 VA
Earth
Ground
1
UL Listed Class 2
Transformer
V
3
2
1
V0
UL Listed Class 2
Transformer
Max. 100 VA
120/
240 VAC
COM
24 VAC / VDC
Earth
Ground
1
Power wiring example for two or more controllers per transformer
Unitary controllers
3
2
1
V0
3
2
1
V0
3
2
1
V0
POW24
Unitary controller
UL Listed Class 2
Transformer
Max. 100 VA
120/
240 VAC
COM
24 VAC / VDC
Power BACnet
TM
MS/TP wiring example for two or more controllers
per transformer
BACnet
TM
MS/TP controllers
3
2
1
V0
3
2
1
V0
3
2
1
V0
Earth
Ground
V0 connected to
other COM ports
internally on the
Unitary
NOTE: In case of various earth points at different potential across the building,
it is not recommended to earth V0 on Unitary devices due to the risk of
earth currents. Given the internal connecting between V0 and all COM terminals,
this could lead to currents flowing through the common wire on the
BACnet
TM
MS/TP signal.
Supply Voltage: 24 VAC/VDC. 50/60 Hz
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