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DCV (Demand Controlled Ventilation) AND POWER
EXHAUST — To check DCV and Power Exhaust:
1. Make sure EconoMi$er IV preparation procedure has
been performed.
2. Ensure terminals AQ and AQ1 are open. The LED for
both DCV and Exhaust should be off. The actuator
should be fully closed.
3. Connect a 9-v battery to AQ (positive node) and AQ1
(negative node). The LED for both DCV and Exhaust
should turn on. The actuator should drive to between 90
and 95% open.
4. Turn the Exhaust potentiometer CW until the Exhaust
LED turns off. The LED should turn off when the
potentiometer is approximately 90%. The actuator should
remain in position.
5. Turn the DCV set point potentiometer CW until the DCV
LED turns off. The DCV LED should turn off when the
potentiometer is approximately 9 v. The actuator should
drive fully closed.
6. Turn the DCV and Exhaust potentiometers CCW until
the Exhaust LED turns on. The exhaust contacts will
close 30 to 120 seconds after the Exhaust LED turns on.
7. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
DCV MINIMUM AND MAXIMUM POSITION — To check
the DCV minimum and maximum position:
1. Make sure EconoMi$er IV preparation procedure has
been performed.
2. Connect a 9-v battery to AQ (positive node) and AQ1
(negative node). The DCV LED should turn on. The
actuator should drive to between 90 and 95% open.
3. Turn the DCV Maximum Position potentiometer to mid-
point. The actuator should drive to between 20 and 80%
open.
4. Turn the DCV Maximum Position potentiometer to fully
CCW. The actuator should drive fully closed.
5. Turn the Minimum Position potentiometer to midpoint.
The actuator should drive to between 20 and 80% open.
6. Turn the Minimum Position Potentiometer fully CW. The
actuator should drive fully open.
7. Remove the jumper from TR and N. The actuator should
drive fully closed.
8. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
MIXED-AIR INPUT — To check mixed-air input:
1. Make sure EconoMi$er IV preparation procedure has
been performed.
2. Set the Enthalpy potentiometer to A. The Free Cool LED
turns on. The actuator should drive to between 20 and
80% open.
3. Remove the 5.6 kilo-ohm resistor and jumper T to T1.
The actuator should drive fully open.
4. Remove the jumper across T and T1. The actuator should
drive fully closed.
5. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
ECONOMI$ER IV TROUBLESHOOTING COMPLE-
TION — This procedure is used to return the EconoMi$er IV
to operation. No troubleshooting or testing is done by perform-
ing the following procedure.
1. Disconnect power at TR and TR1.
2. Set enthalpy potentiometer to previous setting.
3. Set DCV maximum position potentiometer to previous
setting.
4. Set minimum position, DCV set point, and exhaust
potentiometers to previous settings.
5. Remove 620-ohm resistor from terminals S
R
and +.
6. Remove 1.2 kilo-ohm checkout resistor from terminals
S
O
and +. If used, reconnect sensor from terminals S
O
and
+.
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. Reconnect
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.
Phase Loss Protection — The phase loss protection
option will monitor the three-phase electrical system to provide
phase reversal and phase loss protection.
PHASE REVERSAL PROTECTION — If the control sens-
es an incorrect phase relationship, the relay (K1) will be de-
energized (opening its contact). If the phase relationship is
correct, the relay will be energized. The control has a self-
bypass function after a pre-set time. If the control determines
that the three phases stay in a correct relationship for 10 con-
secutive minutes, the relay will stay energized regardless of the
phase sequence of three inputs as long as 24-vac control
voltage is applied. This self-bypass function will be reset if all
three phases are restored in a phase loss event.
PHASE LOSS PROTECTION — If the reverse rotation
board senses any one of the three phase inputs has no AC
voltage, the relay will be deenergized (opening its contact).
This protection is always active as long as 24-vac control volt-
age is applied, and is not affected by the self bypass function of
the phase sequence monitoring function. However, in the event
of phase loss, the relay will be re-energized only if all three
phases are restored and the three phases are in the correct
sequence.
A red LED is provided to indicate the function of the board.
See the table below.
LED STATUS FUNCTION
On Continuously Relay contact closed (normal operation).
Blinking
Relay contact open (phase loss or phase
reversal has occurred) — No power will be
supplied to the control system.
Off 24 vac control power not present (off).