AT C 3 2 U 0 1 A C o m m u n i c a t i n g , P r o g r a m m a b l e T h e r m o s t a t - I O M
C r e a t e d : 1 O c t . , 2 0 1 2
14
9.5
CLEAR FAULT HISTORY
Clear Fault History will clear all fault codes stored in the
thermostat as well as the fault history in any connected
communicating controls (DXM2/AXM).
9.6 MULT-UNIT
DIAGNOSTICS
If multiple units are connected to one thermostat when
Manual Operation, Control Diagnostics, or Dipstick
Confi guration is selected, the service personnel will see a
screen to select a specifi c unit by the last 4 digits of its serial
number.
NOTE:
Multiple units may be connected directly to the ATC
thermostat or connected to one another in series, as shown by
the fi gure below.
9.4.5 Possible
Causes
Possible causes as to why the fault occurred
NOTE
: If multiple units are connected to one thermostat, refer
to section 9.7.
POSSIBLE FAULT CAUSES
LOW WATER COIL TEMP
LOW WATER TEMP - HTG
LOW WATER FLOW - HTG
LOW REFRIG CHARGE - HTG
INCORRECT LT1 SETTING
BAD LT1 THERMISTOR
PREVIOUS
Two
connections
on DXM2
board to allow
for multi-unit
installation
Or
9.4.2 Flow
Conditions
Displays detailed blower and pump speed / valve
position readings that were recorded at the time the
fault occurred.
NOTE
: If multiple units are connected to one thermostat, refer
to section 9.7.
9.4.3 Input/Output
Conditions
Displays the status of all physical and communicated
inputs, switches, and control outputs that were
recorded at the time the fault occurred.
NOTE
: If multiple units are connected to one thermostat, refer
to section 9.7.
9.4.4 Confi guration Conditions
Displays the status of all dipswitch settings that were
recorded at the time the fault occurred.
NOTE
: If multiple units are connected to one thermostat, refer
to section 9.7.
FAULT FLOW CONDITIONS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
ECM TARGET CFM 800
ECM BLOWER RPM 550
FLOW RATE GPM 6.5
PUMP SPEED 60%
VALVE POSITION 0%
PREVIOUS
FAULT I / O CONDITIONS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
TSTAT SAFETY OUTPT
CONV COMM
HPS
Y1
Y1
LOC
CC
Y2
Y2
CO
RV
W
W
ACC1
O
O
OUTPT
ACC2
G
G
FAN
AL1
H
H
HWG
EH1
OVR
DH
PUMP
EH2
PREVIOUS
FAULT CONFG CONDITIONS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
S1 S2 S3
1 ON 1 ON 1 ON
2 ON 2 ON 2 OFF
3 ON 3 ON 3 OFF
4 ON 4 ON 4 OFF
5 ON 5 ON
6 ON 6 ON LT1 WELL
7 ON 7 ON LT2 WELL
8 ON 8 ON
PREVIOUS
