15
MODGAS-X Technical Guide
WIRING
Two Modulating Staged Valves - Communicating Wiring
Fan Enable And
Stage 1 Heat (Mod)
Low Speed Fan
SAT OPTIONS jumper settings should be set to 1.
See
for jumper settings.
Only one Supply Air Temperature Sensor
can be used per application.
SAT OPTIONS Table
24 VAC power input terminals
maximum power consumption
One Gas Valve = 18 VA
Two Gas Valves = 33 VA
NOTE:
1. 24 VAC must be connected so
that all ground wires remain common.
2. All wiring to be in accordance with
local and national electrical codes
and specifications.
40 VA
transformer
minimum
18-30 VAC
GND
Line
Supply Air
Temperature
Sensor
Mount in unit
supply air duct.
GV2
GV1
CR1
H1
CR2
MODGAS-X
AAON P/N: ASM01668
LABEL P/N:
G041210
E-BUS
CONNECT
I2C
CONNECT
+24
V
A
C
GND
CONTACT RATING
@ 24 VAC
IS 1 AMP MAX
VOUT
GND
GAS VALVE
TERMINALS
COMM
RELAY OUTPUT
TERMINALS
INPUT TERMINALS (TYPE)
HEAT EN (BI)
AUX. (BI)
GND
RESET IN (AI)
SAT IN (AI)
GND (AI)
GND
AUX. (AI)
AUX 1
LOW SPEED
FAN
AUX 2
Connect Supply Air Temperature Sensor to AI2 and GND or
AI3 and GND on main controller. (This does not apply to
retrofit applications). See
.
SAT Wiring Conditions Table
I C cable connects to I C Port
on any non VCCX2 or VCB-X Controller
or expansion module
2
2
E-BUS cable connects to
VCCX2 or VCB-X Controller’s
expansion port
Stage 2 Heat (Mod)
H2
YS102378 REV 1
Two Modulating Staged Valves -
Communicating Wiring
For connection to a VCCX2 Controller, VCB-X Controller,
VCCX2 Expansion Mode, or VCB-X Expansion Module, use
an E-BUS cable connecting to the appropriate E-BUS ports.
For all other controllers, including VAV/CAV, MUA, VCM,
VCM-X, SA, and RNE Controllers, use an I
2
C cable connecting
to the appropriate I
2
C ports.
If using the VCM-X Controller, extra fixed stages can be added
by using the VCM-X Expansion Module.
This configuration can use either the MAXITROL
®
0-20 volt
valve(s) or the MAXITROL
®
EXA STAR 0-10 volt stepper
valve(s) (configured at the factory). See
Appendix C, page 36
for depiction.
WARNING:
Do not connect power to VOUT/Ground
terminal block.
Figure 9: Two Modulating Staged Valves Communicating Wiring
