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134 RT-SVD03L-EN
The mixed air sensor (MAS) and outdoor air sensor
(OAS) input from the RTRM are minimum required
sensors.
If a CO
2
sensor is not hooked up, the economizer will
not look for it and will not fault.
The flash codes are prioritized. The higher the flash
count, the more priority the fault has. If there is more
than one fault, only the higher priority fault will flash.
The green system LED is located near the center of the
Honeywell ECA Module and in the corner of the RTEM.
On: OK to economize
Slow flash: Not OK to economize
½ second on, 2 seconds off: no communication
OFF: No power or system failure
Error codes — ½ second on, ¼ second off
1 flash — Actuator fault
2 flash — CO
2
sensor
3 flash — RA humidity sensor
4 flash — RA temp sensor
6 flash — OA humidity sensor
7 flash — No communication with RTRM at power-up,
loss of communication with RTRM, or no reading from
the outdoor air sensor (OAS) in the condenser section
8 flash — MA temp sensor
9-11 flash — Internal fault (Honeywell only - obsolete;
not available to order)
Modbus Communication voltage when measured at
ECA — J17-1 and J17-2 (MBUS +/-) will read
approximately 0.5 - 2.0 vdc (flashing)
Electromechanical Economizer
N No otte e:: Obsolete - Not Available to Order.
Figure 83. Economizer actuator (ECA) connected to
the unit
G 24VAC
Outdoor Thermostat
B 24VAC Common
Y1 1st stage cool
Y2 2nd stage cool
Mixed Air Sensor
TR TR1
SO
SR
+
+
5
2
4
1
3
T
T1
P P1
Minimum
Position
Open CW
Close CCW
A
B
C
D
CC1
CC2
Figure 84. Economizer actuator (ECA) connected to
the unit
R
E
D
BL
U E
W
H
IT
E
Outdoor Ent halpy C ontrol
Return Enthalpy C ontrol
Mixed Air Sens or
Rem ote M inim um
Position Potentiom eter
Y1 1st stage c ool
Y2 2nd stage c ool
CC1
CC2
TR
TR1
S O
S R
A
B
C
D
Minimum
Position
Open CW
Close CCW
+
+
5
2 1
3 4
T T1
P P1
Electromechanical Economizer Testing
N No otte e:: Obsolete - Honeywell only
Electromechanical Mixed Air Sensor
When the outdoor air thermostat is in the cold position
(closed), the unit will attempt to economize if a fan (G)
and cooling (Y1) call exists at the ECA module. This is
readily apparent at the ECA, as the “OK to economize”
LED will be on. During this time, the ECA is measuring
the Mixed Air temperature via the Mixed Air Sensor
(MAS).
Service Tips
The MAS sensor is not energized unless the LED is on
(G signal present, OK to economize), and the Y1 signal
is present.
If the MAS is open, approximately 4.3 VDC will be seen.
Outdoor Air Thermostat opens at 70°F and closes at 60°
F.
Read the voltage with the sensor connected, read the
resistance with the sensor disconnected.
Table 96. Temperature input
Temp F Temp C R(K OHMS)
DC Volts
33.8 1 9.576 3.91
35.6 2 9.092 3.882
37.4 3 8.636 3.894
39.2 4 8.204 3.863
41 5 7.796 3.829
42.8 6 7.412 3.79
44.6 7 7.048 3.749
46.4 8 6.705 3.713
48.2 9 6.38 3.674
50 10 6.073 3.634
51.8 11 5.782 3.59
53.6 12 5.507 3.55
55.4 13 5.247 3.507
57.2 14 5 3.42
59 15 4.767 3.373
E Ecco on no om miizze err