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G. EconoMi$er IV Troubleshooting Completion
This procedure is used to return the EconoMi$er IV to opera-
tion. No troubleshooting or testing is done by performing the
following procedure.
1. Disconnect power at TR and TR1.
2. Set enthalpy potentiometer to previous setting.
3. Set DCV maximum position potentiometer to previ-
ous setting.
4. Set minimum position, DCV set point, and exhaust
potentiometers to previous settings.
5. Remove 620-ohm resistor from terminals S
Demand Control
Ventilation (DCV)
Below set
High
(DCV LED Off)
(Free Cooling LED Off)
Low
(Free Cooling LED On)
Above set
High
(DCV LED On)
(Free Cooling LED Off)
Low
(Free Cooling LED On)
*For single enthalpy control, the module compares outdoor enthalpy
to the ABCD set point.
†Power at N terminal determines Occupied/Unoccupied setting:
24 vac (Occupied), no power (Unoccupied).
**Modulation is based on the supply-air sensor signal.
††Modulation is based on the DCV signal.
and +.
R
Table 37 — EconoMi$er IV Input/Output Logic
INPUTS
Enthalpy*
Y1
Outdoor
Return
Low
On
On
Off
High
On
On
Off
Low
On
On
Off
High
On
On
Off
Fig. 60 — EconoMi$er IV Functional View
6. Remove 1.2 kilo-ohm checkout resistor from termi-
nals S
and +. If used, reconnect sensor from termi-
O
nals S
and +.
O
7. Remove jumper from TR to N.
8. Remove jumper from TR to 1.
9. Remove 5.6 kilo-ohm resistor from T and T1. Recon-
nect wires at T and T1.
10. Remove jumper from P to P1. Reconnect device at P
and P1.
11. Apply power (24 vac) to terminals TR and TR1.
Compressor
Y2
Stage
Stage
1
2
On
On
On
Minimum position
Off
On
Off
Off
Off
Off
On
On
Off
Modulating** (between min.
position and full-open)
Off
Off
Off
Off
Off
Off
Minimum position
On
On
On
Modulating†† (between min.
position and DCV maximum)
Off
On
Off
Off
Off
Off
On
On
Off
Modulating***
Off
Off
Off
Off
Off
Off
***Modulation is based on the greater of DCV and supply-air sensor
signals, between minimum position and either maximum position
(DCV) or fully open (supply-air signal).
†††Modulation is based on the greater of DCV and supply-air sensor
signals, between closed and either maximum position (DCV) or fully
open (supply-air signal).
—
49
—
OUTPUTS
N Terminal†
Occupied
Unoccupied
Damper
Closed
Modulating** (between
closed and full-open)
Closed
Modulating†† (between
closed and DCV
maximum)
Modulating†††
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Troubleshooting
