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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53480391-01

Printed in U.S.A.

Form IIK-CRECOMZR85-01

Pg 20 

3-22

Replaces: NEW

© 2022 Carrier

TROUBLESHOOTING

For a list of common operating issues and concerns, see Table 13.

Power Loss (Outage or Brownout)

All setpoints and advanced settings are restored after any power 

loss or interruption, as all settings are stored in the economizer 

controller’s non-volatile flash memory.
NOTE: If power goes below 18 vac, the W7220 module assumes 

a power loss and the 5-minute power-up delay will become func-

tional when power returns above 18 vac.

Alarms

The economizer module provides alarm messages that display on 

the 2-line LCD.
NOTE: Upon power up, the module waits several seconds before 

checking for alarms. This allows time for all the configured devic-

es (e.g. sensors, actuator) to become operational.
If one or more alarms are present and there has been no keypad ac-

tivity for at least 5 minutes, the Alarms menu displays and cycles 

through the active alarms.

The Alarms menus can be navigated at any time. See Table 9 for 

the Alarms menu.
CLEARING ALARMS
Once the alarm has been identified and the cause has been re-

moved (e.g. replaced faulty sensor). They can be cleared from the 

display.
To clear an alarm, perform the following:
1. Navigate to the desired alarm.
2. Press the 

 (Enter) button.

3. ERASE? displays.
4. Press the 

 (Enter) button.

5. ALARM ERASED displays.
6. Press the        (Menu Up/Exit) button to complete the action 

and return to the previous menu.

NOTE: If the alarm still exists after you clear it, it is redisplayed 

within 5 seconds.

Table 13 — Operating Issues and Concerns

ISSUE OR CONCERN

POSSIBLE CAUSE AND REMEDY

My outdoor temperature reading on the STATUS menu is 

not accurate.

Check the sensor wiring:

• Enthalpy sensors are to be wired to the S-Bus terminals.

• Temperature sensors are to be wired to the OAT and MAT terminals.

If my enthalpy sensor drifts in accuracy over time, can I 

recalibrate it?

The sensor is not able to be recalibrated in the field. However, there is a menu item 

under the ADVANCED menu to input a limited offset in temperature and humidity for 

each sensor that is connected to the economizer.

Can I go back to factory defaults and start over?

Under the SYSTEM SETUP menu, you can change the set points to the factory 

defaults.

Will I be able to see the LCD screen when it is in the unit?

The LCD screen has a backlight that is always illuminated.

What is a good set point for the Mixed Air Temperature 

(MAT)?

The Mixed Air Temperature is the temperature of air to supply to the space. In a 

commercial building, this is between 50°F and 55°F (10°C and 13°C). Mixed air is the 

combination of return air and outdoor air.

I am using enthalpy sensors. Why did the control ask me to 

input a dry bulb changeover temperature?

If the humidity sensor in the enthalpy sensors fails, the backup algorithm in the control is 

to default to the temperature sensor in the enthalpy sensor.

In checkout, the outdoor damper closes when I command it 

to open.

Check the actuator linkage or rotation. In the CHECKOUT mode, the outdoor damper 

should drive open or closed with the return air damper having the opposite effect.

How do I set my minimum position when using a CO

2

 

sensor?

The minimum position is set using the VENTMIN and VENTMAX setup in the 

SETPOINTS menu. VENTMIN is the minimum ventilation required when using an 

occupancy sensor and VENTMAX is the minimum ventilation when not using an 

occupancy sensor for Demand Control Ventilation. The VENTMAX position is set the 

same as with the potentiometer on the analog economizers and is the output voltage to 

the damper actuator. The range is 2 vdc closed OA damper and 10 vdc open OA 

damper.

What if my damper does not go completely closed in the 

checkout operation?

Check the damper linkage or hub to make sure the damper is able to close completely.

How do I set the OCC?

There are two settings for the OCC setting: INPUT and ALWAYS. INPUT is from the 

space thermostat, if it has an occupancy output. ALWAYS is the unit in the occupied 

mode, if the economizer is powered (fan on).

Does the economizer save my program values if the unit 

loses power?

Yes, once the changes are stored in the controller they will be stored until they are 

changed by the operator.

If the unit is left in checkout, how long will the unit stay in 

checkout mode without input?

The unit will remain in checkout for 10 minutes, then return to normal operation.

Summary of Contents for CRECOMZR085A00

Page 1: ...autions in the literature tags and labels attached to the unit and other safety precautions that may apply Follow all safety codes including ANSI American National Standards Institute Z223 1 Wear safety glasses and work gloves Use quenching cloth for unbrazing operations Have fire extinguisher available for all brazing operations It is important to recognize safety information This is the safety a...

Page 2: ...BDCIOX005A00 is an accessory that contains both 33ZCSENS CO2 and 33ZCASPCO2 accessories NOTE Dry Bub sensor HH79AH001 is included in the kit Dry Bulb sen sor HH79ZZ007 can be used as a replacement part CAUTION PERSONAL INJURY HAZARD Failure to follow this caution can result in personal injury and damage to the unit Cover the duct opening as a precaution so objects cannot fall into the return duct ...

Page 3: ...e ID inside dimension of the panel with the ID of the economizer then attach using pro vided screws See Fig 4 7 If the EconoMi er X system will be operating with an enthalpy outside air sensor remove the factory installed HH79AH001 dry bulb sensor from the front face of the economizer see Fig 1 and install the accessory enthalpy sensor HH57AC081 in the same location Connect the 2 wire gray harness...

Page 4: ...ign with top holes on O A panel Fasten with provided sheet metal screws See Fig 6 10 Install the O A hood to the O A panel over the EconoMi er assembly Use screws provided See Fig 6 11 Attach R A blank off panel See Fig 7 Grommet must be installed before duct work is installed 12 Attach the O A hood assembly to the OA panel with included screws See Fig 6 13 Install provided barometric relief hood ...

Page 5: ...ECON plug currently connected to the Unit Control Board UCB See Fig 11 16 Connect the 12 pin female ECON plug removed from the UCB to the 12 pin male plug from the controller harness Refer to Fig 12 and wiring diagram on page 7 17 Connect the 12 pin female plug from the controller harness to ECON on the UCB Refer to Fig 13 and wiring diagram on page 7 Fig 9 Typical Indoor Fan Motor Access Panel Lo...

Page 6: ... holes See Fig 16 Connect one of the 2 green wire harnesses into the HH79AH001 sensor and then connect the green wires to the orange and brown wires routed from the control See Fig 17 23 The supply air temperature sensor may look like an eyelet terminal with wires running to it HH79ZZ007 The sensor is located on the crimp end and is sealed from moisture Mount the supply air temperature sensor prov...

Page 7: ...Economizer Wiring Diagram To Control Box ORG BRN Bundle these connections into the corner post with wire tie GRN GRN W7220 SAT Sensor Ref To Control Box ORG BRN GRN GRN W7220 Ring Terminal Ref PL6 Ref Bundle these connections into the corner post with wire tie PNK VIO VIO PNK ...

Page 8: ...etpoints the outside air can be used for free cooling When any of these is above the setpoint free cooling will not be available Figure 22 shows the enthalpy boundaries in the W7220 controller There are 5 enthalpy boundaries setpoints ES1 thru ES5 which are defined by dry bulb temperature enthalpy and dew point ES3 is the default setting See Fig 22 Single Enthalpy and Dual En thalpy High Limit Cur...

Page 9: ...RVE TEMP DRY BULB F TEMP DEWPOINT F ENTHALPY btu lb da POINT P1 POINT P2 TEMP F HUMIDITY RH TEMP F HUMIDITY RH ES1 80 60 28 0 80 36 8 66 3 80 1 ES2 75 57 26 0 75 39 6 63 3 80 0 ES3 70 54 24 0 70 42 3 59 7 81 4 ES4 65 51 22 0 65 44 8 55 7 84 2 ES5 60 48 20 0 60 46 9 51 3 88 5 HL 86 66 32 4 86 38 9 72 4 80 3 ...

Page 10: ...el the Fixed Enthalpy limit value shall be set to the enthalpy value at 75 F and 50 relative humidity As an example at approximately 6 000 foot elevation the fixed enthalpy limit is approximately 30 7 Btu lb LEGEND Demand Controlled Ventilation Refer to Fig 17 for EconoMi er X wiring DCV instructions if demand controlled ventilation CO2 sensor is used The CO2 sensor will wire into the blue and bla...

Page 11: ...le to some codes is an annunciator light visible by service personnel See Fig 25 and 26 for typical wiring to the controller Refer to codes for proper labeling of light Fig 25 Thermostat Wired For Remote FDD Fig 26 Annunciator Light Wired for Remote FDD C R AUX2 1 OCC E GND EXH1 AUX1 0 Y2 I Y2 O Y1 I Y1 O C R W7220 ECONOMIZER U1 U1 R Rc C A L A FURNACE AIR HANDLER OR RTU TH8321R OR TH8321WF SUB BA...

Page 12: ...the current menu parameter 10 Press the Menu Up Exit button to return to the previous menu Programming the W7220 Controller The next several pages detail the different status displays set points setup and alarms available on the controller The list below and Table 8 summarize the inputs required for a standard application with a single outside air sensor NOTE Instead of setting the SETPOINTS you c...

Page 13: ...o 1 speed Table 8 Standard W7220 Controller Configuration CONTROLLER MENU ITEM FOR SINGLE SPEED UNIT FOR 2 SPEED UNIT NOTE DEFAULT SET TO DEFAULT SET TO SET POINTS MAT SET 53 F 38 F to 70 F 53 F 38 F to 70 F LOW T LOCK 32 F 45 F to 80 F 32 F 45 F to 80 F DRYBLB SET 63 F 48 F to 80 F 63 F 48 F to 80 F Only displayed if using single DB OA sensor ENTH CURVE ES3 ES1 to ES5 ES3 ES1 to ES5 Only displaye...

Page 14: ...if sensor sends invalid value short or out of range OA HUM _ _ 0 to 100 OUTSIDE AIR RELATIVE HUMIDITY Displays measured value of outdoor humidity from OA sensor Displays __ if not connected short or out of range RA TEMP _ _ _ F or C 0 F to 140 F 18 C to 60 C RETURN AIR TEMPERATURE Displays measured value of return air temperature from RAT sensor Displays _ _ _ if sensor sends invalid value if not ...

Page 15: ...T LOW SPEED Displays only if a CO2 sensor is connected Used for Vbz ventilation max cfm set point Displays 2 to 10 V if 3 sensors RA OA and MA In AUTO mode dampers controlled by cfm VENTMAX M 5 4V 2 to 10 vdc DCV MAXIMUM DAMPER POSITION AT MEDIUM SPEED Only displays if unit is set for 3 speed with 1 heat and 2 cool Set for HEATING ventilation VENTMAX H 4 4V 2 to 10 vdc DCV MAXIMUM DAMPER POSITION ...

Page 16: ...g fans etc will shut off DCVCAL ENA MAN MAN manual AUTO Turns on the DCV automatic control of the dampers Resets ventilation based on the RA OA and MA sensor conditions Requires all 3 RA OA and MA sensors For single speed units only MAT T CAL 0 0 F or C 2 5 F 1 4 C MIXED AIR TEMPERATURE CALIBRATION Allows for the operator to adjust for an out of calibration mixed air temperature MAT sensor OA T CA...

Page 17: ...nected check wiring then replace sensor if the alarm continues OA SENS T ERR n a n a OUTSIDE AIR TEMPERATURE SENSOR ERROR Outdoor air temperature sensor has failed or become disconnected check wiring OAT sensor connected at input terminals OAT then replace if the alarm continues OA SYLK SENS ERR n a n a OUTSIDE AIR ENTHALPY SENSOR ERROR OAT sensor connected on S bus DA T SENS ERR n a n a DISCHARGE...

Page 18: ...rt cycle the compressors Table 10 Economizer Module Left Hand Terminal Blocks LABEL TYPE DESCRIPTION Top Left Terminal Block MAT MAT 20k NTC and COM Mixed Air Temperature Sensor Polarity insensitive connections OAT OAT 20k NTC and COM Outdoor Air Temperature Sensor Polarity insensitive connection S BUS S BUS S BUS Sylk Bus Enthalpy Control Sensor Polarity insensitive connection Bottom Left Termina...

Page 19: ...ontrol will call for compressor operation Dampers will modulate to maintain MAT at set point concurrent with Compressor 1 operation The Low T Lock setting default 32 F will lock out compressor operation when outside air temperature is below setpoint When space temperature demand is satisfied thermostat Y1 opens the dampers will return to Minimum Damper position if indoor fan is running or fully cl...

Page 20: ...nput a limited offset in temperature and humidity for each sensor that is connected to the economizer Can I go back to factory defaults and start over Under the SYSTEM SETUP menu you can change the set points to the factory defaults Will I be able to see the LCD screen when it is in the unit The LCD screen has a backlight that is always illuminated What is a good set point for the Mixed Air Temper...

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