15
Remote (Downstairs) Monitoring of Controller’s
Fault Detection and Diagnostics
Many codes including IECC, Title 24, and ASHRAE 90.1 require
that the economizer’s faults be accessible by operating or service
personal, or annunciated locally on zone thermostat. To setup
remote monitoring on the controller, under SYSTEM SETUP,
AUX1-OUT must be set to SYS.
The latest versions of Honeywell’s TH8321WF or TH8321R
thermostats are options for meeting this requirement. Figure 33
shows an example of the thermostat wiring to the controller. Fol-
low instructions provided with Honeywell thermostat.
Another option that is acceptable to some codes is an annunciator
light visible by service personnel. See Fig. 34 for typical wiring to
the controller. Refer to codes for proper labeling of light.
Fig. 33 — Thermostat Wired For Remote FDD
Fig. 34 — Annunciator Light Wired for Remote FDD
CR
AUX2-1
OCC
E-GND
EXH1
AUX1-0
Y2-I
Y2-O
Y1-I
Y1-O
C
R
W7220
ECONOMIZER
U1
U1
R
Rc
C
A-L/A
TH8321R OR
TH8321WF
SUB-BASE
MAT
Controller Setting: Under the “System Setup” menu, set AUX1-OUT to
“SYS” which will close controller relay on fault detection.
Examples of annunciator lights
would include these Grainger lights:
- Item #20C841
- Item #20C846
AUC2-1
OCC
E-GND
EXH1
AUX1-0
Y21
Y2O
Y1I
Y1O
=CR
IAQ COM
IAQ (2-10V)
IAQ 24V
ACT (2-10V)
ACT COM
ACT 24V
MAT
OAT
OAT
TO “C” TERMINAL
TO “AUX1-O” TERMINAL
Annunciator Light*
W7220 Economizer Controller Module
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