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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 midpoint.

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.

Supply-Air Input

To check supply-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 Completion

This procedure is used to return the EconoMi$er IV to operation.

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 previous set

ting. Note: when not using a CO

sensor the DCV Max

potentiometer must be fully closed (CCW) for the Minimum

Position potentiometer to function correctly.

4. Set minimum position, DCV set point, and exhaust potenti

ometers to previous settings.

5. Remove 620-ohm resistor from terminals SR and +.
6. Remove 1.2 kilo-ohm checkout resistor from terminals SO

and +. If used, reconnect sensor from terminals SO 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

Содержание CRECOMZR052A00

Страница 1: ...filters and replacing filters All other operations should be performed by trained service personnel When working on air conditioning equipment observe precautions 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 clot...

Страница 2: ... for horizontal only 1 Side Replacement Panel for horizontal only 3 Filter Supports 3 Central Retainer 1 Hood Top 1 Left Hood Side 1 Right Hood Side 2 Side Retainer 2 Top Diverters 3 Deflector 4 Outside Air Filter Screens 1 Supply Air Temperature Sensor SAT 60 Screws 1 Seal Strip CRECOMZR053A00 48 50TC 25 30 48 50HC 24 28 580J 558J 25 30 581J 551J 17 20 RGS RAS 300 336 RGH RAH 240 303 1 Damper Ass...

Страница 3: ...air temperature sensor supply air temperature sensor and low temperature compressor lockout switch See Fig 1 Return air temperature indoor enthalpy and outdoor enthalpy sensors are available for field installation Field installed CO2 sensors are available See Table 2 Barometric relief dampers provide natural building pressurization control Barometric relief dampers are built into the design and ar...

Страница 4: ...Insert provided screw through the bottom left rear of the economizer and into the unit base See Fig 4 Reinstall the unit s left side panel 8 Before the economizer is secured in place on the right hand side remove and save the 12 pin jumper plug from the unit wiring harness See Fig 7 Insert the economizer plug into the unit wiring harness plug NOTE The 12 pin jumper plug should be saved for future ...

Страница 5: ... panels Items 4 and 5 to upper panel using the screws provided e Apply seal strip to mating flange of the hood see Fig 10 f Secure hood top Item 3 to upper panel using the screws provided On 44 in chassis remove the screws from across top cover of unit The rear flange of hood top will slide behind unit top over flange g Secure side retainers Item 6 to side panels Items 4 and 5 using the screws pro...

Страница 6: ...f Damper Remove Shipping Screw Insert two 2 screws through the panel and into the economizer Apply seal strip to the front of this flange Apply seal strip to the back of this flange Apply seal strip to the back of this flange Apply seal strip to the back of this flange 7 7 3 5 6 8 8 2 8 6 4 2 1 2 ITEM DESCRIPTION QTY 1 Filter Supports 3 2 Central Retainer 3 3 Hood Top 1 4 Left Hood Side 1 5 Right ...

Страница 7: ...r can be configured for specific job requirements at the controller When not using with a CO2 sensor the DCV Max potentiometer on the controller must be fully closed CCW for the Minimum Position potentiometer to function correctly d Settings for the optional outdoor enthalpy sensor indoor enthalpy sensor power exhaust and CO2 sensor can be configured at the controller 17 Install the hood screens a...

Страница 8: ...mizer and into the unit base See Fig 20 Install the new provided left side panel without the duct opening on the unit 8 Before the economizer is secured in place on the right hand side remove and save the 12 pin jumper plug from the unit wiring harness Insert the EconoMi er IV plug into the unit wiring harness plug See Fig 23 NOTE The 12 pin jumper plug should be saved for future use in the event ...

Страница 9: ...lief Hood Ordered Separately Field Supplied Return Duct Relief Damper Upper End Panel Shipped On Base Unit Bottom Panel Shipped On Base Unit Indoor Fan Panel Unit s left side panel with duct opening Left front corner post UNIT S LEFT SIDE PANEL ECONOMI ER IV LEFT CORNER POST Left Corner Post Unit s Left Side Panel Economizer IV Economizer Screw Economizer To Base Economizer Unit s Left Side Panel ...

Страница 10: ...screws provided i Apply seal strip to top diverters Item 7 j Secure top diverters Item 7 to hood top Item 3 k Install outdoor air screens by sliding them into each of the four spaces created by the hood filter support and central retainers To do so first insert the air screens into pocket created at the end of hood Item 3 then fully put the air screen into place and then slide them back into pocke...

Страница 11: ...SAT Bottom panel with Return duct opening Apply seal strip to the front of this flange Apply seal strip to the back of this flange Apply seal strip to the back of this flange Apply seal strip to the back of this flange 7 7 3 5 6 8 8 2 8 6 4 2 1 2 ITEM DESCRIPTION QTY 1 Filter Supports 3 2 Central Retainer 3 3 Hood Top 1 4 Left Hood Side 1 5 Right Hood Side 1 6 Side Retainer 2 7 Top Diverters 2 8 D...

Страница 12: ...ping position on the unit end See Fig 31 2 Remove the side panels located in the hood parts box see Fig 32 3 Install parts as shown in the following exploded view see Fig 33 using the seal strip and screws provided in the parts box Figure 34 illustrates the installed barometric hood parts Fig 30 Barometric Hood Parts Insert Air Screen Slide Into Position 18 3 8 Provided Upper panel Economizer outs...

Страница 13: ...13 Fig 31 Shipping Location Vertical Units Fig 32 Barometric Hood Box Parts Location Fig 33 Barometric Hood Exploded View ...

Страница 14: ...uct for the relief damper See Fig 35 3 On the field installed economizer CRECOMZR0 A00 a birdscreen or hardware cloth is shipped attached to the bottom panel used for vertical applications NOTE This panel is not used for horizontal return applications Remove the screen from the provided panel and install it over the relief opening cut in return duct 4 Using the blade brackets install the relief da...

Страница 15: ...side of the mating flanges to ensure a watertight seal Install the CRBARHOD001A00 over the relief damper and screw to the return duct as illustrated in Fig 36 Outdoor Air Hood CRBARHOD001A00 Relief Hood Ordered Separately Field Supplied Return Duct Relief Damper Min 19 1 2 Blade Bracket Provided with Economizer ...

Страница 16: ...e operating range of temperature measurement is 0 F 18 C to 158 F 70 C See Table 4 for sensor temperature resistance values The temperature sensor looks like an eyelet terminal with wires running to it The sensor is located in the crimp end and is sealed from moisture LOW TEMPERATURE COMPRESSOR LOCKOUT SWITCH The EconoMi er IV assembly is equipped with a low ambient temperature lockout switch loca...

Страница 17: ...XB078ENT for ICP is required Replace the standard outdoor dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location See Fig 38 When the outdoor air enthalpy rises above the outdoor enthalpy changeover set point the outdoor air damper moves to its minimum position The outdoor enthalpy changeover set point is set with the out door enthalpy set point potentiometer o...

Страница 18: ... P E R P O U N D D R Y A I R 85 29 90 32 95 35 100 38 105 41 110 43 35 2 35 2 40 4 40 4 105 41 110 43 45 7 45 7 50 10 50 10 55 13 55 13 60 16 60 16 65 18 65 18 70 21 70 21 75 24 75 24 80 27 80 27 85 29 90 32 95 35 100 38 APPROXIMATE DRY BULB TEMPERATURE F C A A B B C C D D R E L A T I V E H U M I D I T Y HIGH LIMIT CURVE TR1 24 Vac COM TR 24 Vac HOT 1 2 3 4 5 EF EF1 _ P1 T1 P T N EXH 2V 10V EXH Se...

Страница 19: ...um position potentiometer to allow the minimum amount of outdoor air as required by local codes to enter the building Make minimum position adjustments with at least 10 F temperature difference between the outdoor and return air temperatures To determine the minimum position setting perform the following procedure 1 Calculate the appropriate mixed air temperature using the following formula TO Out...

Страница 20: ... for a given damper position For best results there should be at least a 10 degree difference in outside and return air temperatures TO Outdoor Air Temperature OA Percent of OutdoorAir TR Return Air Temperature RA Percent of ReturnAir TM Mixed Air Temperature Once base ventilation has been determined set the minimum damper position potentiometer to the correct position The same equation can be use...

Страница 21: ...ery unit can be added to reduce the moisture content of the fresh air being brought into the building when the enthalpy is high In most cases the normal heating and cooling processes are more than adequate to remove the humidity loads for most commercial applications If normal rooftop heating and cooling operation is not adequate for the outdoor humidity level and energy recovery unit and or a deh...

Страница 22: ...OTE 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 EconoMi er IV controller 1 Disconnect power at TR and TR1 All LEDs should be off Exhaust fan contact 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 ...

Страница 23: ...ntiometer 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 Completion This procedur...

Страница 24: ...r 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 INPUTS OUTPUTS Demand Controlled Ventilation DCV Enthalpy Y1 Y2 Compressor N Terminal Outdoor Return Stage 1 Stage 2 Occupied Unoccupied Damper Below set DCV LED Off High Free Cooling LED Off Low On On On On Minimum po...

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