Orion System MODGAS-XWR - Manual (Page 8)

WIRING
MODGAS-XWR Technical Guide 8
12-Relay E-BUS Expansion Module - Stand Alone
One Modulating Valve with 1 Fixed
Stage or Two Modulating Valves -
Stand-Alone Wiring, Continued
The 12-Relay E-BUS Expansion Module is only used with Single
Modulating Valve One Fixed Stage Stand-Alone (Figure 3, page 6) or
Two Modulating Valves Stand-Alone (Figure 4, page 7) confi gurations.
See Figure 5, below.
If communication is lost to the 12-Relay E-BUS Expansion Module,
the 12-Relay E-BUS Expansion Module will turn off its relays and the
MODGAS-XWR Controller will alarm and fall back to using only its
onboard stages. If communications is restored, the MODGAS-XWR
Controller will begin staging up if needed.
Figure 5: Stand-Alone Up to 12 Additional Stages of Fixed Heat - 12-Relay E-BUS Expansion Module
12-Relay E-BUS
Expansion Module
RLY9 R1
R5
RLY10 R2
R6
RLY11 R3
R7
RLY12 R4
R8
EBC E-BUS Cable
Connect To MODGAS-XWR Controller
24 VAC
GND
15 VA Minimum
Power Required
WARNING!!
Observe Polarity! All boards must be wired with GND-to-GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to
one or more of the boards. Expansion Modules must be wired in such a way that the expansion modules and the controller are always
powered together. Loss of power to the expansion module will cause the controller to become inoperative until power is restored to the
expansion module.
Note:
All Relay Outputs Are Normally Open
And Rated For 24 VAC Power Only.
1 Amp Maximum Load.
RLY9
RLY10
RLY11
RLY12
RLY-COM
MADE IN USA
RLY-COM
RLY-COM
RLY1
RLY2
RLY3
RLY4
RLY8
RLY7
RLY6
RLY5
24VAC
GND
EXPANSION BOARD
YS102324 REV 2
RELAY
24 V
A
C
GND
RLY1
RLY2
RLY3
RLY4
COM COM
RLY5
RLY6
RLY7
RLY8
COM
Fixed Heat Stage 3
Fixed Heat Stage 4
Fixed Heat Stage 5
Fixed Heat Stage 6
Fixed Heat Stage 7
Fixed Heat Stage 8
Fixed Heat Stage 9
Fixed Heat Stage 10
Fixed Heat Stage 11
Fixed Heat Stage 12
Fixed Heat Stage 13
Fixed Heat Stage 14
R9
R10
R11
R12