Honeywell CENTRA LINE MERLIN NX Series - SSR (DO) Wiring Examples; SSR Wiring with One Transformer; SSR Wiring with Separate Transformer; 20 VDC Auxiliary Wiring Examples

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R0722 18
SSR (DO) Wiring Examples
Fig. 19 SSR (DO) Wiring Examples
NOTE:
• SR IN (terminal 5, SSR power input) is connected to AC OUT (terminal 4, 24VAC~ output) by a jumper wire at fac-
tory.
• Remove the jumper if different voltages need to be used for SSRs.
• All terminals are protected against short circuit and 24VAC.
20 VDC Auxiliary Wiring Examples
Fig. 20. 20 VDC Auxiliary Wiring
7
8 9
10
11
12 13
4 5
SR1 C SR2 SR3 C SR4 SR5 C AC OUT SR IN
SR1 - SR5 Solid State Relay (SSR)
6
UL Listed Class 2
Transformer
Field
Devices
100 VA
120 /
240 VAC
3
2
1
~
V0
AC OUT
5
4
SR IN
8
7
6
MERLIN IP/MSTP VAV CONTROLLER
COM
24 VAC
Earth
Ground
1
1
WHEN CONNECTING POWER TO THE MERLIN IP/MSTP VAV CONTROLLERS,
CONNECT THE COM LEG OF THE VAC SECONDARY CIRCUIT TO A KNOWN EARTH GROUND.
SR1
C
SR2
M M
UL Listed Class 2
Transformer
Field
Devices
100 VA
120 /
240 VAC
3
2
1
~
V0
AC OUT
5
4
SR IN
8
7
6
MERLIN IP/MSTP VAV CONTROLLER
COM
24 VAC
Earth
Ground
1
SR1
C
SR2
M M
Field Device
Transformer
120 /
240 VAC
SSR Wiring With One Transformer And Factory Jumper
SSR Wiring A With Separate Transformer Without Jumper Installed
20 VDC Auxiliary
Power Output
31 30
20V DC OUT
C
29 28
IO7
C
S
31 30
20V DC OUT
C