Carrier 50HC Series User Manual

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3. Use the Up/Down button to select the preset
number. See Table 10.
4. Press Enter to lock in the selection.
5. Press Mode to exit and resume normal operation.
The custom sett ings of the CO
2
sensor can be changed
anytime after the sensor is energized. Follow the steps
below t o change the non-standard settings:
1. Press Clear and Mode buttons. Hold at least 5
seconds until the sensor enters the Edit mode.
2. Press Mode twice. The STDSET Menu will appear.
3. Use the Up/Down button to toggle to the NONSTD
menu and press Enter.
4. Use the Up/Down button to toggle through each of
the nine variables, starting with Altitude, until the
desired setting is reached.
5. Press Mode to move through the variables.
6. Press Enter to lock in the selection, then press Mode
to continue to the next variable.
Dehumidification of Fresh Air with DCV (Demand
Controlled Ventilation) Control
If normal rooftop heating and cooli ng operation is not
adequa te for the outdoor hum idity level, an energy
recove ry unit a nd/or a de humidification option should be
considered.
EconoMi$er IV Preparation
This proce dure is used to prepare the EconoMi$er IV for
troubleshooting. No troubleshooting or testing is done by
performing the following procedure.
NOTE: This procedure requires a 9--v battery, 1.2
kilo--ohm resistor, and a 5.6 kilo--ohm resistor which are
not supplied with the E conoMi$er IV.
IMPORTANT: Be sure to record the positions of all
potentiometers before starting troubleshooting.
1. Disconnect power at TR and TR1. All LEDs should
be off. Exhaust fan contacts should be open.
2. Disconnect device at P and P1.
3. Jumper P to P1.
4. Disconnect wires at T and T1. Place 5.6 kilo--ohm
resistor across T and T1.
5. Jumper TR to 1.
6. Jumper TR to N.
7. If connected, remove sensor from terminals SO and +.
Connect 1.2 kilo--ohm 4074EJM checkout resistor
across terminals SO and +.
8. Put 620--ohm resistor ac ross term inals SR and +.
9. Set minimum position, DCV setpoint, and exhaust po-
tentiometers fully CCW (counterclockwise).
10. Set DCV maximum position potentiometer fully CW
(clockwise).
11. Set enthalpy potentiometer to D.
12. Apply power (24 vac) to terminals TR and TR1.
Differential Enthalpy
To check differential enthalpy:
1. Make sure EconoMi$er IV preparation procedure has
been perform ed.
2. Place 620--ohm resistor ac r oss SO and +.
3. Place 1.2 kilo--ohm resistor across SR and +. The
Free Cool LED should be lit.
4. Remove 620--ohm resistor across SO and +. The Free
Cool LED should turn off.
5. Return EconoMi$er IV settings and wiring to normal
afte r c ompleting troubleshooting.
Single Enthalpy
To check single enthalpy:
1. Make sure EconoMi$er IV preparation procedure has
been perform ed.
2. Set the enthalpy potentiometer to A (fully CCW). The
Free Cool LED should be lit.
3. Set the enthalpy potentiometer to D (fully CW). The
Free Cool LED should turn off.
4. Return EconoMi$er IV settings and wiring to normal
afte r c ompleting troubleshooting.
DCV (Demand Controlled Ventilation) and Power
Exhaust
To check DCV and Power Exhaust:
1. Make sure EconoMi$er IV preparation procedure has
been perform ed.
2. Ensure terminals AQ and AQ1 are open. The LED for
both DCV and Exha ust should be off. The actuator
should be fully closed.
3. Connect a 9--v battery to AQ (positive node) and AQ1
(negat ive 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 po-
tentiometer is approximately 90%. The actuator
should remain in position.
5. Turn the DCV setpoint potentiometer CW until the
DCV LE D turns off. The DCV LED should turn off
when the potentiometer is approximately 9 --v. The ac-
tuator should drive ful ly 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 t urns
on.
7. Return EconoMi$er IV settings and wiring to normal
afte r c ompleting troubleshooting.
DCV Minimum and Maximum Position
To check the DCV minimum and maximum position:
50HC

Carrier 50HC Series Specifications

General

Brand	Carrier
Model	50HC Series
Category	Air Conditioner
Language	English