E1ECON17C-2 Economizer and Outdoor Air Hood

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Specifications:

• Model: E1ECON17C-2
• Part No.: 508136-02
• Application: Used with LG/LC/LH/LD 156-300 units
• Type: High Performance Economizer

Product Usage Instructions:

Installation:

Install Economizer:

1. Disconnect all power to the unit.

2. Release latches and open filter access panel.

3. Align bottom of economizer with economizer support bracket and
   slide economizer into the unit.

4. Fit economizer end plate over the end of economizer and secure
   end plate with sheet metal screws.

5. Connect economizer plug P3 to unit jack J3 as shown in FIGURE

Replacing Factory-Installed Economizers:

Remove three shipping screws (when present) from the economizer
before removing from the unit. If installed, remove shorter hood
filter bracket and filters. Remove and replace filters referring to
the Outdoor Air Hood section. Refer to the Installation section to
remove economizer from the unit.

FAQ:

Q: Can I use field-provided sensors instead of

factory-installed sensors?

A: Yes, optional field-provided sensors may be
used instead of factory-installed sensors to determine whether
outdoor air is suitable for free cooling. Refer to TABLE 2 in the
Start-Up section for more information.

Q: What precautions should I take during installation?

A: As with any mechanical equipment, contact
with sharp sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and protective
clothing.

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©2023

ECONOMIZERS

508136-02

1/2023

E1ECON17C-2 ECONOMIZERS

Supersedes 508136-01

INSTALLATION INSTRUCTIONS FOR ECONOMIZER AND OUTDOOR AIR HOOD USED WITH LG/LC/LH/LD 156-300 UNITS

Shipping and Packing List
Economizer Package 1 of 1 contains:
Damper Assembly
1- Economizer damper assembly
1- Economizer end plate (secured to packaging)
1- Bag assembly containing:

10- 32 X 1/2 Thread forming screws # 6- 32 X 1 Machine screws #10-16 X 5/8

Self-drilling screws Hood Assembly
1- Hood top
1- Hood top seal
2- Hood sides
2- Filter side brackets
2- Top filter brackets 1- Bottom filter bracket 3- Filters 1- Hood bottom
1- Filler panel
2- Filter side seals
*When economizer is factory-installed, hood sides, side filter brackets and filters are packaged separately and shipped in the blower compartment. The top and bottom filter brackets are secured to the hood top and the hood top is shipped in place on the unit.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer or equivalent or service agency.

Application
NOTE – Gravity exhaust dampers are required with economizers. Refer to installation instructions provided with gravity exhaust dampers.
The E1ECON economizer is used with LG/LC units in downflow air discharge applications. See TABLE 1 The economizer uses outdoor air for free cooling when temperature and/or humidity is suitable. LG/LC units are equipped with the following factory-installed, CEC Title 24 approved sensors:
· RT17 – Outside Air Temperature
· RT16 – Return Air Temperature
· RT6 – Discharge Air Temperature
See FIGURE 13 in the Start-Up section for sensor location.
Optional field-provided sensors may be used instead of unit sensors to determine whether outdoor air is suitable for free cooling. Refer to TABLE 2 in the Start-Up section.

Econ Type High Performance

TABLE 1 ECONOMIZER

Part No.

22J18

604592-14

CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.

ECONOMIZER INSTALLATION
ECONOMIZER ASSEMBLY
ECONOMIZER END PLATE

ECONOMIZER MOTOR
JACK/PLUG P3

BOTTOM OF ECONOMIZER

ECONOMIZER SUPPORT BRACKET
FIGURE 1

Install Economizer

1 – Disconnect all power to unit.

2 – Release latches and open filter access panel.
3 – Align bottom of economizer with economizer support bracket and slide economizer into unit. See FIGURE 1.

4 – Fit economizer end plate over end of economizer and secure end plate with sheet metal screws.

5 – Connect economizer plug P3 to unit jack J3 as shown in FIGURE 2.

JACK / PLUG CONNECTIONS

J104

B7 ECONOMIZER
MOTOR

J18 J105

Replacing Factory-Installed Economizers Remove three shipping screws (when present) from the economizer before removing from unit. See FIGURE 3. If installed, remove shorter hood filter bracket and filters. Remove and replace filters referring to the Outdoor Air Hood section. Refer to the Installation section to remove economizer from unit.
REMOVING FACTORY-INSTALLED ECONOMIZERS
VIEW SHOWN FROM OUTSIDE OF UNIT WITH HOOD AND TOP SEAL REMOVED

A2 J3

P3

CONNECT ECONOMIZER PLUG P3 TO UNIT JACK J3

FIGURE 2

REMOVE THREE SHIPPING SCREWS (WHEN PRESENT)
FIGURE 3

Page 2

Outdoor Air Hood
The outdoor air hood is packaged separately but attached to the damper assembly crate. Use #10 self drilling screws to install hood unless noted otherwise. Refer to FIGURE 4 through FIGURE 9.
1 – Remove and retain screws securing unit top back panel; remove and discard panel.
2 – Secure top seal stiffener to back side of hood top seal. See FIGURE 4 and FIGURE 5.
3 – Slide hood top seal under unit cabinet top and secure using five retained top screws. Install, but do not tighten, the two screws on each end of the hood to seal. Refer to FIGURE 5.
4 – Remove and retain top three screws on the left mullion of the outdoor air section. See FIGURE 5.
5 – Secure hood top stiffener to unpainted side of the hood top with ten screws. See FIGURE 3 and FIGURE 6.
6 – Position the hood top edge V-channel under the corresponding V-channel on the hood top seal and slide into place from right to left. See FIGURE 4 and FIGURE 5.
7 – Tighten the two screws on each end of the hood top seal left loose in step 3.
REMOVE FIVE SCREWS ON TOP PANEL FLANGE

REMOVE THREE MULLION SCREWS

HOOD TOP SEAL END SCREWS

SECURE TOP SEAL STIFFENER HERE

HOOD SIDE VIEW
HOOD TOP SEAL TOP SEAL STIFFENER HOOD TOP STIFFENER HOOD TOP
FILTER
ALIGN VERTICAL HOLES ON BRACKET WITH VERTICAL HOLES ON SIDE OF HOOD BOTTOM FILTER BRACKET FIGURE 5
UNIT TOP PANEL HOOD TOP SEAL END SCREWS
ALIGN HOOD TOP WITH HOOD TOP SEAL
AT THIS END
DIVISION PANEL

OUTDOOR COIL

BOTTOM PANEL

RIGHT MULLION

LEFT MULLION

FIGURE 4 Page 3

8 – Install L-shaped left side filter bracket to left hood side. See FIGURE 6.
9 – Secure left hood side to the hood top. See FIGURE 7. Secure the left hood side to the unit using three screws removed in step 4. See FIGURE 7.
10 – Install the right side filter bracket to the right hood side. See FIGURE 6.
11 – Factory-Installed Economizers –
Remove the bottom filter bracket from the hood top assembly panel. See FIGURE 8.
12 -Factory-Installed Economizers –
Remove the short and long top filter brackets from the hood top assembly panel. See FIGURE 8.
13 – Secure the right hood side to the hood top. See FIGURE 9. Do NOT secure the right hood side to unit.
14 – Align the two holes on the left hood side with the two holes in the bottom filter bracket. See FIGURE 3 and FIGURE 7. Secure with screws.

HOOD TOP STIFFENER END SCREWS

HOOD TOP STIFFENER
END VIEW

LEFT HOOD SIDE

TOP FILTER BRACKET
(LONG)

15 – Secure bottom filter bracket to right hood side in the same manner. See FIGURE 4 and FIGURE 9.
16 – Secure the right hood side to the unit as shown in FIGURE 9.
17 – Secure the top filter bracket (long) to the hood top. See FIGURE 3 and FIGURE 5. Slide two filters into place.
NOTE – Slide the filters to the left side of the hood. Make sure there are no air gaps between either two filters or the filter and the left hood side.
18 – Insert the third filter into the bottom filter bracket. Position the top filter bracket (short) as shown in FIGURE 4 and FIGURE 6. Secure the bracket to the hood top with screws.
19 – Make sure there are no gaps between the filters by sliding the filters to the left.
20 – Caulk (field-provided) both ends of the top seal and hood top as shown in FIGURE 7 and FIGURE 9.

HOOD TOP STIFFENER END SCREWS

END VIEW

HOOD TOP

RIGHT HOOD SIDE

BOTTOM FILTER BRACKET

TOP FILTER BRACKET (SHORT)

RIGHT SIDE FILTER
BRACKET

LEFT SIDE FILTER
BRACKET

FIGURE 6

Page 4

HOOD LEFT SIDE VIEW

SEAL WITH CAULK

HOOD TOP SEAL

HOLES FOR BOTTOM FILTER
BRACKET

LEFT HOOD SIDE

HOOD TOP

LEFT
FIGURE 7
REMOVE BRACKETS
(FACTORY-INSTALLED ECONOMIZERS ONLY)

HOOD RIGHT SIDE VIEW

HOOD TOP SEAL

CORNER OF UNIT

HOOD TOP

RIGHT HOOD SIDE

SEAL WITH CAULK

FIGURE 8

HOLES FOR BOTTOM FILTER
BRACKET

REMOVE TWO SCREWS

HOOD TOP

BOTTOM FILTER BRACKET REMOVE THREE SCREWS

FIGURE 9

TOP FILTER BRACKET (SHORT) TOP FILTER BRACKET (LONG)

Page 5

A55 1
3 4
7 8 9

P262 J262A

B

J105 P105

J104 P104

B4
RW S118

LGH/LCH

J298 J3 P3

3

A72

1

2

2

1

B7

B7

RED 2

1 5
A7
2

1

A62 1

S174

3

B43

12

3

4 3
8 9

WHITE 3
BRWN 5

J262A

BLK

2

7

1

DESCRIPTION

KEY

COMPONENT

A7 SENSOR, SOLID STATE ENTHALPY

A130 CONTROL, ERS

8

A55 CONTROL, MAIN PANEL LENNOX

A62 SENSOR, ENTHALPY INDOOR

9

A72 CONTROL, REMOTE MIN POS (OPT)

B7 MOTOR, DAMPER ECONOMIZER

10

B43 MOTOR, EXHAUST DAMPER

J3

JACK, UNIT ECONOMIZER

J104 JACK, SENSOR OUTDOOR ENTHALPY

J105 JACK, SENSOR RETURN AIR ENTHALPY 2 J153 JACK, ENTHALPY / DAMPER MOTOR

J193 JACK, ENTHALPY SENSOR J298A JACK, IAQ INTERFACE

1

J262A JACK, DAMPER MOTOR

J262B JACK, ENTHALPY SENSORS

P3 PLUG, ECONOMIZER BYPASS

P153 PLUG, ENTHALPY / DAMPER MOTOR

P193 PLUG, ENTHALPY SENSOR

P262 PLUG, ECONOMIZER OUTPUT

S118 THERMOSTAT, DESICANT DEFROST

S174 SWITCH, EXHAUST DAMPER

J104 P193 J193

J298 P153 J153

1

3

2

4

5

2

5

6

1

A130 TB37 K1
1
3 K2
2 K4
4
5
6 6

FIGURE 10

1 2 3 4 5 6
ACCESSORIES
Lennox Commercial

Page 6

538072- 01
01

Rev 1

LGM/LCM/LGT/LCT/LHT/LDT/LGX/LCX

AA

BB

CC

DD

–

–

–

–

02

03

04

– – – – – – – – –

05

06

07

08

09

10

HTG CLG CLG ACCS ACCS

SEC SEC SEC SEC SEC

A

B B3 C

D

WI RI NG DI AGRAM FLOW

–

FIGURE 11

Page 7

M2 Unit Controller Economizer Start-Up and Operation

The unit will be equipped with either an M2, M3, or M4 Unit Controller. M2, M3, or M4 will be printed on the bottom of the Unit Controller near the SBUS connector. Use the appropriate start-up section in this manual and refer to the Unit Controller provided with the rooftop unit. Application manuals are available for all Unit Controllers.
The economizer is controlled by the Unit Controller which is located in the unit control panel. A detailed menu layout can be found in the Unit Controller manual provided with each unit.
A-Field-Installed Economizer
The Unit Controller must be set to identify an economizer has been installed.
1 – Use the Unit Controller keypad to enter the following menu:
Setting / Install / Damper
2 – Use the up/down arrows to display ECON and press the SELECT button (!SET! will display).
3 – Press the left arrow returning up the menu path until the Unit Controller resets and saves the change.
The Unit Controller will now operate the economizer.
B-Free Cooling Mode and Setpoint
On start-up, the economizer mode defaults to TEMP OFFSET. In this mode, free cooling is energized when the outdoor air temperature (RT17) is less than return air temperature (RT16) by at least the offset value. The default offset value is 10°F. Use the following menu path on the Unit Controller to adjust the free cooling mode or setpoint. See FIGURE 13 for sensor location.
Settings / Setpoints / Damper / Economizer Mode
Refer to TABLE 2 and FIGURE 12 for additional free cooling modes and setpoints. The Unit Controller has a restricted range of input values for each mode as shown in TABLE 2.

NOTE – An energy management system may be used to provide the outdoor air suitable (OAS) signal via network connection. The free cooling mode must be set to one of the TEMP modes to allow this function.
C-California Title 24 Compliance
For California Title 24 compliance, adjust the free cooling setpoint based on:
· The climate zone where the unit is installed. See TABLE 3.
· The setpoint requirement published by the California Energy Commission. See Section 140.4 Prescriptive Requirements for Space Conditioning Systems of the 2013 Building Energy Efficiency Standards.
NOTE – Values in the referenced standard will supersede values listed in TABLE 3.
PARTIAL VIEW OF UNIT CONTROLLER MENU

SETPOINTS

DAMPER

ECONOMIZER MODE

TEMP

Use arrows
to move

Use arrows
to move

ENTH

GLOBAL

TROL TROL

SET
OAT STPT
DIFF OFFSET ODE STPT

! SET !

XXºF XXºF

! SET ! ! SET !

XX.X MA
XX.X MA

! SET ! ! SET !

SUPPLY AIR STPT

XX.XºF [44.9 TO 65.3ºF]

! SET !

MIN OCP BLOWER LOW

XXX% [0 TO 100%}

! SET !

MIN OCP BLOWER HIGH

XXX% [0 TO 100%]

! SET !

FIGURE 12

TABLE 2 ECONOMIZER MODES AND SETPOINT

Free Cooling
Mode

Free Cooling Setpoint

FieldProvided Sensors

Dampers will modulate to 55°F discharge air (RT6) when outdoor air is suitable:

TEMP OFFSET

None Needed

Outdoor air temperature (RT17) is less than return air temperature (RT16) by at least the OFFSET value.

TEMP OAT STPT

None Needed Outdoor air temperature (RT17) is less than the OAT STPT value.

Remote Remote

Energy Management System**

Either of the TEMP modes can be used when a network OAS signal is provided by an energy management or building control system, via BACnet, LonTalk, or L Con nection. The network can command OAS, NOT OAS, or AUTO. AUTO returns to local control of OAS, which is the selected TEMP mode.

ENTH

DIFF OFFSET

(Two) C7400

Outdoor air enthalpy* (A7) is less than return air enthalpy (A62) by at least the OFF SET value.

ENTH ODE STPT

C7400

Outdoor air enthalpy (A7) is less than free cooling setpoint.

GLOBAL GLOBAL

24VAC Input Signal

Global input is energized by (P297-9). This setting is also used for outdoor air damp er applications. Global input also brings on the blower. (This mode is NOT used when OAS signal is provided via network connection. GLO is only used when a 24VAC signal is used to energize the P297-9 GLO input.)

*Enthalpy includes effects of both temperature and humidity. **Energy management system smay require additional field-provided sensors; refer to manufacturer’s instructions.

Permitted Inputs 0-40°F 41-75°F
NA
0mA-4mA 12-19mA
NA

Page 8

SENSOR LOCATION

RT16 RETURN AIR SENSOR

RT6 DISCHARGE AIR SENSOR

FIGURE 13

RT17 OUTDOOR AIR SENSOR

TABLE 3 FREE COOLING SETPOINT

Climate Zone 1, 3, 5, 11-16

Setpoint (Single Sensible)
75°F

Setpoint (Differential Sensible)
0°F

2, 4, 10 6, 8, 9

73°F

2°F

71°F

4°F

7

69°F

6°F

D-Setting Free Cooling Setpoint in Enthalpy Mode

Free Cooling Setpoint – ODE STPT

The enthalpy sensor (A7) provides a milliamp signal to
the Unit Controller based on outdoor air temperature and
humidity. See TABLE 4. To set a free cooling setpoint of 73°F at 50% relative humidity, enter “12” at the ODE STPT menu prompt. The Unit Controller will allow dampers to modulate open at approximately 73°F. If the space temperature is too warm, change the ODE STPT to “13.6” and the Unit Controller will allow dampers to modulate open at approximately 70°F.

TABLE 4 FREE COOLING SETPOINT – ODE STPT OR ECONOMIZER ENTHALPY SETPOINT MODE

Enthalpy Setpoint °F (°C)* Menu Entry – mA

Counts

73 (23)

12.0

150

70 (21)

13.6

173

67 (19)

15.5

199

63 (17)

17.6

224

*Approximate temperature at 50% relative humidity.

Free Cooling Differential Enthalpy – DIFF OFFSET
The Unit Controller allows damper modulation when outdoor air is lower than return air by a differential or offset temperature and humidity range. To set an offset range of 7°F at a constant relative humidity, enter “4” at the DIFF OFFSET menu prompt. If return air is 76°F, the Unit Controller will allow damper to modulate open at approximately 69°F outdoor air. See TABLE 5. If the space temperature is too cool or dry, change the DIFF OFFSET to “3” and the Unit Controller will allow dampers to modulate open at approximately 71°F outdoor air.

TABLE 5 FREE COOLING SETPOINT – DIFF OFFSET MODE

*Temperature Offset °F
2

**Relative Humidity Offset %
6

Menu Entry mA
1

Counts 13

3.5

12

2

26

5.3

18

3

39

7

24

4

53

*At a constant relative humidity. **At a constant temperature.

E-Damper Minimum Position Setting

Use the menu path in FIGURE 12 to set the minimum % open damper position when outdoor air is not suitable
for free cooling. The minimum setpoint range is 0% open (dampers closed) to 100% (dampers fully open). On units with staged supply air blowers, refer to the unit installation
instructions.

Page 9

Economizer Operation
NOTE – Use indicating lights on Unit Controller to determine thermostat demand.
See TABLE 6 for economizer operation with a standard two-stage thermostat
TABLE 7 shows economizer operation with an energy management system which uses a global sensor.
Both tables show the occupied and unoccupied time period. The occupied time period is determined by the thermostat or energy management system.
TABLE 8 shows economizer operation in zone sensor mode.
IAQ DAMPER OPERATION
The M2 and M3 Unit Controllers have a 0-10VDC IAQ input for a standard 0-2000ppm CO2 sensor. The economizer starts opening at a CO2 level of 500 ppm (default) and reaches full open at a CO2 level of 1000ppm.
M2 Unit Controller
These levels are adjustable as outlined in the M2 Unit Controller manual under the menu Settings > Setpoints > IAQ.
If the economizer is operating in the free cooling mode and the IAQ sensor demands more fresh air, the IAQ demand will override the free cooling demand to open the dampers further or to keep them open.

A flashing OAS LED on the Unit Controller indicates an IAQ override condition.
The IAQ function is not energized during the unoccupied or night time period.

TABLE 6 ECONOMIZER OPERATION – STANDARD TWO-STAGE THERMOSTAT (DEFAULT OPTION)

THERMOSTAT DEMAND

DAMPER POSITION UNOCC.

DAMPER POSITION OCCUPIED

MECHANICAL COOLING

OUTDOOR AIR IS NOT SUITABLE FOR FREE COOLING (M2 UNIT CONTROLLER–OAS LED “OFF”)

OFF

CLOSED

CLOSED

NO

G

CLOSED

MINIMUM

NO

Y1

CLOSED

MINIMUM

STAGE 1

Y2

CLOSED

MINIMUM

STAGES 1 AND 2

OUTDOOR AIR IS SUITABLE FOR FREE COOLING (M2 UNIT CONTROLLER–OAS LED “ON”)

OFF

CLOSED

CLOSED

NO

G

CLOSED

MINIMUM

NO

Y1

MODULATING MODULATING

NO

Y2

MODULATING

MODULATING (1)

STAGE 1

NOTE – Modulating dampers adjust to control supply air

(RT6) to 55°F (13°C). (1) The Unit Controller goes into a

“cool down” or “warm-up” mode when the occupied time

period starts. (2) Units with two-stage compressor opera-

tion will operate only stage 1 with a Y2 demand.

Page 10

TABLE 7 ECONOMIZER OPERATION WITH GLOBAL SENSING – ENERGY MANAGEMENT SYSTEM (DEFAULT OPTION)

THERMOSTAT DEMAND

DAMPER POSITION UNOCC. DAMPER POSITION OCCUPIED

MECHANICAL COOLING

GLOBAL INPUT OFF (M2 UNIT CONTROLLER–OAS LED “OFF”)

OFF

CLOSED

CLOSED

NO

G

CLOSED

MINIMUM

NO

Y1

CLOSED

MINIMUM

STAGE 1

Y2

CLOSED

MINIMUM

STAGES 1 AND 2

GLOBAL INPUT ON (M2 UNIT CONTROLLER–OAS LED “ON”)

OFF

MODULATING

MODULATING

NO

G

MODULATING

MODULATING

NO

Y1

MODULATING

MODULATING

STAGE 1

Y2

MODULATING

MODULATING (1)

STAGES 1 AND 2 (2)

NOTE – Modulating dampers adjust to control supply air (RT6) to 55°F (13°C). (1) The Unit Controller goes into a “cool down” or “warm-up” mode when

the occupied time period starts. (2) Units with two-stage compressor operation will operate only stage 1 with a Y2 demand (default).

TABLE 8 ECONOMIZER OPERATION – ZONE SENSOR MODE

THERMOSTAT DEMAND

DAMPER POSITION UNOCC. DAMPER POSITION OCCUPIED

MECHANICAL COOLING

OUTDOOR AIR IS NOT SUITABLE FOR FREE COOLING (M2 UNIT CONTROLLER–OAS LED “OFF”)

OFF

CLOSED

CLOSED

NO

G

CLOSED

MINIMUM

NO

Cooling Stage 1

CLOSED

MINIMUM

COMPRESSOR 1

Cooling Stage 2

CLOSED

MINIMUM

COMPRESSOR 1 & 2

Cooling Stage 3

CLOSED

MINIMUM

COMPRESSOR 1, 2, & 3

Cooling Stage 4

CLOSED

MINIMUM

COMPRESSOR 1, 2, 3, & 4

OUTDOOR AIR IS SUITABLE FOR FREE COOLING (M2 UNIT CONTROLLER–OAS LED “ON”)

OFF

CLOSED

CLOSED

NO

G

CLOSED

MINIMUM

NO

Cooling Stage 1

MODULATING

MODULATING

NO

Cooling Stage 2

FULL OPEN*

FULL OPEN*

COMPRESSOR 1

Cooling Stage 3

FULL OPEN*

FULL OPEN*

COMPRESSORS 1 & 2

Cooling Stage 4

FULL OPEN*

FULL OPEN*

COMPRESSORS 1, 2, 3, & 4

*Damper will modulate to maintain 55°F supply air when ECTO 6.27 is changed to setting “0”. NOTE – Modulating dampers adjust to control supply air (RT6) to 55°F (13°C).

Page 11

2.0 M3 Unit Controller Economizer Start-Up and Operation

The economizer, when configured, controls:
· Damper position, which determines how much outdoor air is used to meet free cooling or indoor air quality requirements, and
· Optional power exhaust fans.
On a cooling demand, outdoor air is used for free cooling instead of first- stage compressor(s) when outdoor air is suitable.
1.1. Enabling Economizer and Settings
To enable the economizer if installed go to SETUP > INSTALL and go through the wizard.

When reaching Configuration ID 1, position 2 will need to be set to the applicable type of economizer. Valid types are as indicated below:
· M = Motorized Outdoor Air Damper Only
· T = Economizer – Temperature (Note: Used for both set point and offset temperature control.)
· G = Economizer – Global
· S = Economizer – Single Enthalpy
· D = Economizer – Dual Enthalpy
The following options are available depending on economizer set above. These settings are available through the main menu at:
SETUP > TEST & BALANCE > DAMPER.

TABLE 9 MENU INTERFACE (LEVEL 1 – SETTINGS) – M (MOTORIZED OUTDOOR AIR DAMPER ONLY)

Level 2

Level 3

Level 4

Level 5

USE THE ADJUST AND SET VALUES ARROWS TO SCROLL UP OR DOWN FOR SELECTION OPTIONS.

MIN DAMPER POSITION BLOWER ON HIGH = X.X %

MIN DAMPER POSITION BLOWER ON LOW = X.X %

DEMAND CONTROL VENT

DAMPER START OPEN = XXXX.X PPM

RTU OPTION

DEMAND CONTROL VENT DAMPER
DAMPER FULL OPEN = XXXX.X PPM

DEMAND CONTROL VENT

DAMPER MAX OPENING = XXX.X%

FRESH AIR HEATING ENABLE FAH = YES OR NO

FRESH AIR HEATING FAH SETPOINT = XX F

FRESH AIR COOLING ENABLE AFC = YES OR NO

FRESH AIR COOLING AFC SETPOINT = XX F

Page 12

Level 2 RTU OPTION
Level 2 RTU OPTION

TABLE 10 MENU INTERFACE (LEVEL 1 – SETTINGS) – T (TEMPERATURE ECONOMIZER)

Level 3

Level 4

Level 5

USE THE ADJUST AND SET VALUES ARROWS TO SCROLL UP OR DOWN FOR SELECTION OPTIONS.

ECONOMIZER TEMP ECON TYPE = TEMPERATURE OFFSET OR TEMPERATURE SETPT

ECONOMIZER

OAT SETPOINT = XX.X F

FREE COOLING

SUPPLY AIR SETPOINT = XX F

MIN DAMPER POSITION

BLOWER ON HIGH = X.X %

MIN DAMPER POSITION

DAMPER

BLOWER ON LOW = X.X % DEMAND CONTROL VENT

DAMPER START OPEN = XXXX.X PPM

DEMAND CONTROL VENT

DAMPER FULL OPEN = XXXX.X PPM

DEMAND CONTROL VENT

DAMPER MAX OPENING = XXX.X%

FRESH AIR HEATING ENABLE FAH = YES OR NO

FRESH AIR HEATING FAH SETPOINT = XX F

FRESH AIR COOLING ENABLE AFC = YES OR NO

FRESH AIR COOLING AFC SETPOINT = XX F

TABLE 11 MENU INTERFACE (LEVEL 1 – SETTINGS) – G (GLOBAL ECONOMIZER)

Level 3

Level 4

Level 5

USE THE ADJUST AND SET VALUES ARROWS TO SCROLL UP OR DOWN FOR SELECTION OPTIONS.

FREE COOLING

SUPPLY AIR SETPOINT = XX F

MIN DAMPER POSITION

BLOWER ON HIGH = X.X

MIN DAMPER POSITION

BLOWER ON LOW = X.X

DEMAND CONTROL VENT

DAMPER

DAMPER START OPEN = XXXX.X PPM DEMAND CONTROL VENT

DAMPER FULL OPEN = XXXX.X PPM

DEMAND CONTROL VENT

DAMPER MAX OPENING = XXX.X%

FRESH AIR HEATING ENABLE FAH = YES OR NO

FRESH AIR HEATING FAH SETPOINT = XX F

FRESH AIR COOLING ENABLE AFC = YES OR NO

FRESH AIR COOLING AFC SETPOINT = XX F

1.2. Damper Operation During Free Cooling
These are operating profile options for the economizer damper (Parameter 164 – ECONOMIZER PROFILE) during free cooling when any compressor is on and can be selected as follows:
Option 0: Damper continues to modulate while compressors are on, but the effect of mechanical cooling may force the damper closed to its minimum position. After compressor starts, the free cooling set point is lowered to fixed temperature setting of 45°F.

Option 1: Damper opens to its maxopen position (Parameter 131 – FREE CL MAX DAMPER) when any compressors start.
NOTE – When using Option 1 and after the compressor is stopped, the M3 shall resume damper modulation.
Option 2: Is as follows:
· Holds-off compressor on Y2 call until damper has modulated to maximum position (Parameter 131 FREE CL MAX DAMPER) for three minutes.

Page 13

· After three minutes, the compressor starts and the free cooling set point is lowered to 45°F. Damper is not locked at maximum open while compressor is on, but modulates to maintain 45°F discharge air temperature.
· When Y2 is satisfied, compressor goes off and free cooling set point is restored to 55°F (Parameter 159 FREE COOL SUPPLY SP).
Option 3: Same as Option 2, but with a ten-minute delay instead of a three- minute delay.
1.3. Free Cooling Compressor Lockout Mode and Low Ambient Set Point
Go to SETTINGS > RTU OPTION > EDIT PARAMETER = 285 (FRCL COMP LCKOUT MD). Default value is 2. Range is 0 to 2.
0 = Disable Compressor Lockout
1 = Lockout Compressor if outdoor air is suitable regardless of outdoor air temperature.
2 = Lockout Compressor if outdoor air temperature is below Parameter 108 setting and Outdoor Air is Suitable (Default).

Go to SETTINGS > RTU OPTION > EDIT PARAMETER = 108 (FREE LO AMB LCKT SP). Default value is 55.0°F. Range is 45.0 to 80.0°F.
1.4. Outdoor Air Suitable for Free Cooling
The M3 Unit Controller displays the outdoor air suitability information on the status screen.
The appropriate sensors are provided when the economizer is factory- configured. When the economizer is field-installed and configured, the single or dual enthalpy modes require additional field-provided sensor(s).
1.5. Enthalpy Set Point
This setting pertains to the single enthalpy free cooling mode only. The M3 Unit Controller will enable free cooling when outdoor air enthalpy (A7) is less than the enthalpy set point (Parameter 162 – ECON FREECL ENTH SP). FIGURE 14 shows the approximate enthalpy sensor output at various temperatures and percentage of relative humidity.

ENTHALPY SENSOR OUTPUT CURRENT HONEYWELL C7400
100 90 80
70 60 50 40
30 20 10
40°F 50°F 60°F 70°F 80°F 90°F 100°F

FIGURE 14

Page 14

TABLE 12 MENU INTERFACE (LEVEL 1 – SETTINGS) – SINGLE ENTHALPY

The following settings are available when Configuration ID 1, position 2 is set to S (Single Enthalpy)

Level 2

Level 3

Level 4

USE THE ADJUST AND SET VALUES ARROWS TO SCROLL UP OR DOWN FOR SELECTION OPTIONS.

ENTHALPY SET POINT

MA SETTING

ECONOMIZER

73°F

12.0

ENTHALPY SET POINT = 70°F

13.6

XX.X MA

67°F

15.5

63°F

17.6

CLIMATE ZONE

SINGLE SENSIBLE

FREE COOLING SUPPLY AIR SET POINT = XX.X F

1, 3, 5, 11-16 2, 4, 10 6, 8, 9

75.0°F 73.0°F 21.0°F

7

69.0°F

MIN DAMPER POSITION

BLOWER ON HIGH = X.X %

RTU OPTION

DAMPER

MIN DAMPER POSITION BLOWER ON LOW = X.X %

DEMAND CONTROL VENT

DAMPER START OPEN = XXXX.X PPM

DEMAND CONTROL VENT

DAMPER FULL OPEN = XXXX.X PPM

DEMAND CONTROL VENT

DAMPER MAX OPEN = XXX.X %

FRESH AIR HEATING

ENABLE FAH =

FRESH AIR HEATING FAH SET POINT = XX F

YES OR NO

FRESH AIR COOLING

ENABLE AFC =

FRESH AIR COOLING AFC SET POINT = XX F

YES OR NO

Page 15

TABLE 13 MENU INTERFACE (LEVEL 1 – SETTINGS) – DUAL ENTHALPY

The following settings are available when Configuration ID 1, position 2 is set to D (Dual Enthalpy)

Level 2

Level 3

Level 4

USE THE ADJUST AND SET VALUES ARROWS TO SCROLL UP OR DOWN FOR SELECTION OPTIONS.

TEMP OFFSET* °F

RELATIVE HUMIDITY OFFSET %**

MA SETTING

2

6

1.0

ECONOMIZER

3.5

12

2.0

ENTHALPY SET POINT = XX.X MA

5.3

18

3.0

7

24

4.0

• AT A CONSTANT RELATIVE HUMIDITY

** AT A CONSTANT TEMPERATURE

CLIMATE ZONE SINGLE SENSIBLE

FREE COOLING SUPPLY AIR SET POINT = XX.X F

1, 3, 5, 11-16 2, 4, 10 6, 8, 9

75.0°F 73.0°F 21.0°F

7 RTU OPTION DAMPER MIN DAMPER POSITION

69.0°F

BLOWER ON HIGH = X.X %

MIN DAMPER POSITION

BLOWER ON LOW = X.X %

DEMAND CONTROL VENT

DAMPER START OPEN = XXXX.X PPM

DEMAND CONTROL VENT

DAMPER FULL OPEN = XXXX.X PPM

DEMAND CONTROL VENT

DAMPER MAX OPENING = XXX.X%

FRESH AIR HEATING ENABLE FAH = YES OR NO

FRESH AIR HEATING FAH SETPOINT = XX F

FRESH AIR COOLING ENABLE AFC = YES OR NO

FRESH AIR COOLING AFC SETPOINT = XX F

1.6. Free Cooling Damper Maximum Position
Damper Maximum position for free cooling is by default set to 100%. To modify this settings, use the following path:
SETTINGS > RTU OPTION > EDIT PARAMETER – 131 (FREE CL MAX DAMPER)
1.7. Minimum Damper Position
Use the following menu path to modified the minimum damper positions for both high and low operations.
SETUP > TEST & BALANCE > DAMPER > MIN DAMPER POSITION BLOWER ON HIGH = .%
SETUP > TEST & BALANCE > DAMPER > MIN DAMPER POSITION BLOWER ON LOW = .%
1.8. Motorized Outdoor Air Damper
Set damper position according to “Minimum Damper Position” section 1.7. For normal operation, make sure the motorized outdoor air damper is set correctly in Configuration ID 1, position 2 needs to be set to M. The damper will open to the specified position during the occupied time period and close during the unoccupied time period.

NOTE – When equipped with Motorized Outdoor damper Air Damper, 2.0 provides only Demand Control Ventilation. Free Cooling/Economizer function is not available.
1.9. Economizer Checkout
The following checkout procedures are completed with unit energized. Confirm proper operation of the heartbeat LED. Step 1 will determine whether the economizer is allowing full damper travel. Use step 2 when the damper does not respond to step 1.
Steps 3, 4, 5, and 6 checkout the operating modes; checkout only the mode that applies to the unit being worked on.
CAUTION
Power exhaust fans will be functional. To prevent operation of power exhaust fans, disconnect power to unit and then PED jack/plug P/J18.

Page 16

Step 1- ECONOMIZER OUTPUT VOLTAGE
The M3 Unit Controller monitors P262 (DPOS) and operates as reference in Section Damper Diagnostics in the (M3 Unit Controller) Application Guide (Advance Features).
A – Go to SERVICE > TEST > DAMPER>POSITION > DAMPER POSITION ACTUAL: 0.0% The motor will slowly modulate to the closed position.
B – Change DAMPER POSITION ACTUAL to 100.0%. The motor will slowly modulate to the fully opened position.
C – If the motor does not respond, go to step 2. If the motor does respond properly, go to the appropriate mode of operation checkout.
Step 2- OUTPUT VOLTAGE CHECK
A – Go to SERVICE > TEST > DAMPER > POSITION > DAMPER POSITION ACTUAL: 0.0%
B – Adjust the DAMPER POSITION ACTUAL: to 0.0% position.
C – Measure the voltage on P262 between pin 3 (VOT damper control) and pin 2 (GND) using pin 1 as common. Voltage should read approximately 2 VDC.
D – Adjust the DAMPER POSITION ACTUAL: to 100.0% position.
NOTE – Allow approximately 90 seconds for actuator to react.
E – Measure the voltage between P262 between pin 3 (VOT damper control) and pin 2 (GND) using pin 1 as common. Voltage should read approximately 10 volts DC. If not, check wiring and trouble shoot system.
Step 3- SINGLE ENTHALPY OPERATION (ODE)
In the single enthalpy mode, dampers open for free cooling when the outdoor enthalpy is less than the enthalpy set point (Parameter 162 – ECON FREECL ENTH SP); dampers will try to modulate discharge air temperature (RT6) to (Parameter 159 – FREE COOL SUPPLY SP) which has a default setting of 55.0°F (13°C).
A – Go to SETUP > INSTALL > press SAVE until you get to the Configuration ID 1, position 2 needs to be set to S for Economizer Single Enthalpy and press SAVE.
B – To simulate low outdoor enthalpy. Disconnect A7 outdoor enthalpy sensor jack/plugs J/P104. Connect a 750 ohm resistor across plug J104-1 and J104-2. J104 is located in the filter access area.
C – Check all connections and wiring between J104 and the control.
Step 4- DUAL ENTHALPY MODE OF OPERATION
In dual enthalpy mode mode, dampers open for free cooling when the outdoor air enthalpy is lower than the return air enthalpy by difference value of (Parameter 163 – ECN FRCL ENTH OFFST); dampers will modulate discharge air temperature (RT6) to (Parameter 159 – FREE COOL SUPPLY SP) which has a default setting of 55.0°F (13°C).

A – Go to SETUP > INSTALL > press SAVE until you get to the Configuration ID 1 position 2 needs to be set to D for Economizer Dual Enthalpy and press SAVE if performing an economizer field-install.
B – Use two resistors to simulate outdoor air enthalpy suitable.
C – Disconnect A62 return air enthalpy sensor jack/plug J/P105. Place a 1500 ohm resistor between J105-1 and J105-3. J/P105 is located in the filter access area.
D – Disconnect A7 outdoor enthalpy sensor jack/plugs J/ P104. Connect a 750 ohm resistor across J104-1 and J104-2.
Step 5- ALL TEMPERATURE MODES OF OPERATION
In the Economizer ­ Temperature mode, the damper opens for free cooling when the outdoor air temperature is:
· Less than return air temperature by at least a difference of (Parameter 161 – ECON FRCL TMP OFFST) if Temperature Offset mode is selected
· Less than (Parameter 160 – ECON FREECL TEMP SP)
In all modes, dampers will try to modulate discharge air temperature (RT6) to (Parameter 159 – FREE COOL SUPPLY SP) which has a default setting of 55.0°F (13°C).
Refer to the “Displaying Sensor Inputs” section to read return air (RT16) and outdoor air (RT17) temperatures. If outdoor air is not cooler than return air, simulate a colder outdoor air temperature with a resistor. Select a resistor value that corresponds to a temperature (see TABLE 14):
A – Locate RT17 sensor in unit. Disconnect 1/4″ quick connect terminals on wires leading from sensor.
B – Jumper RT17 wires leading back to control with the appropriate resistor.
C – Check all connections and wiring between RT17 and the M3 Unit Controller, and between RT16 and the M3 Unit Controller.

TABLE 14 TMP MODE RESISTOR VALUES

Temp °F (°C)
30 (-1) 40 (4)

Size Resist
or
34,566
26,106

Temp °F (°C)
50 (10) 60 (16)

Size Resist
or
19,904
15,313

Temp °F (°C)
70 (21) 80 (27)

Size Resist
or
11,884
9,298

Temp °F (°C)
90 (32) 100 (38)

Size Resist
or
7,332
5,826

Step 6- GLOBAL MODULATING (GLO) MODE OF OPERATION

In the GLO (modulating) mode, dampers modulate open for free cooling when the global input is energized; dampers will try to modulate discharge air temperature (RT6) to (Parameter 159 – FREE COOL SUPPLY SP) which has a default setting of 55.0°F (13°C).

NOTE – The global input turns on the blower.

Page 17

MEASURE A7 AND A62 CURRENT IN SERIES

DISCONNECT J/P104
Damper Travel: % of Maximum Open

PLACE JUMPER WIRE HERE

READ CURRENT HERE

–

DC AMMETER

Measure A7 Current in Series

FIGURE 15

DISCONNECT J/P105

PLACE JUMPER WIRE HERE

READ CURRENT HERE

–

DC AMMETER

Measure A62 Current in Series

A – Set global mode using the Configuration ID 1, position 2, and set to character G.
B – Connect a jumper between A55_P297-1 (24VAC) and A55_P297-9 (global). The blower will be energized and the damper will slowly open if discharge air temperature (RT6) is greater than (Parameter 159 – FREE COOL SUPPLY SP) which has a default setting of 55.0°F (13°C).
C – Disconnect 24VAC to A55_P297-9. The blower will turn off and the damper will close.
D – If the damper does not actuate check all connections and wiring between P262A and B.
Step 7- ENTHALPY SENSOR OPERATION (A7 and A62)
A – Connect a direct current ammeter as shown in FIGURE 15 to measure current output of A7 or A62.
NOTE – If Enthalpy Sensors are configured, current sensor reading by M3 controller can be verified on User interface:
B – The reading will be between 4 and 20 ma. depending on outdoor temperature and humidity. Refer to FIGURE 14 to approximate reading.
Go to DATA > IN/OUTPUTS > SENSORS > LOCAL (scroll down to IE: x.x mA and OE: x.x mA)
C – If the meter reads zero, check sensor wiring harness for continuity and/or check polarity of sensor wiring.
1.10. Demand Control Ventilation
1.10.1. General
A field-provided and installed indoor air quality (IAQ) sensor can be used with the modulating economizer or OADM to control carbon dioxide levels in the conditioned space. The carbon dioxide level in a space is an indicator of the number of people occupying a room. As the carbon dioxide level rises (indicating the occupancy of a room has increased), dampers modulate open – regardless of outdoor air suitability.

Likewise, as the carbon dioxide level falls (indicating the occupancy has decreased), dampers modulate further closed.
Standard economizer installations have a minimum fresh air ventilation requirement based on maximum room occupancy. With standard economizer use, the amount of air required for maximum room occupancy is heated or cooled with each heating or cooling cycle. IAQ installations use the maximum amount of required ventilation air only with maximum room occupancy; less outdoor air needs to be heated or cooled when fewer people are in the conditioned space.
If the economizer is operating in the free cooling mode and the indoor air quality control requires the damper to open further, the indoor air quality demand will override the free cooling demand.
The IAQ function is not energized during the unoccupied or night time period.
NOTE – The IAQ sensor may also be used with systems containing a motorized outdoor air damper.
1.10.2. Default Operation
The M3 Unit Controller has a 0-10VDC indoor air quality input for a standard 0 – 2000ppm carbon dioxide sensor. The economizer starts opening at a carbon dioxide level of 500 ppm (default) (start open set point) and reaches full open at a carbon dioxide level of 1000ppm (default) (full open set point).
The damper opens to a default position of 100% (see Parameter 117). Determine damper travel position using the following formula:
% Damper Travel = carbon dioxide ppm – Start Open ppm
5

Page 18

Example: At a carbon dioxide level of 750ppm, the damper will be approximately 50% open:
Use the menu interface to read carbon dioxide ppm. DATA > IN/OUTPUTS > SENSORS

C02. FIGURE 16 shows default or proportional operation.
1.10.3 Maximum and Minimum Demand Control Ventilation Damper Settings
Maximum position is set using the following menu path:
Go to SETUP > TEST & BALANCE > DAMPER > DAMPER MAX OPENING = .%
Use the following menu path to modified the minimum damper positions for both high and low blower operations.
Go to SETUP > TEST & BALANCE > DAMPER > MIN DAMPER POSITION BLOWER ON HIGH = .%
Go to SETUP > TEST & BALANCE > DAMPER > MIN DAMPER POSITION BLOWER ON LOW = .%
1.10.4 Parameter Adjustments
Default indoor air quality economizer operation is based on common or average applications. Adjustments may be made to the indoor air quality parameters to alter operation or meet required specifications. Use the user interface to change Parameter 117 through 119. Go to SETTINGS > RTU OPTIONS > EDIT PARAMETER.

Select a demand control ventilation mode with Parameter 134. Modes 3 and 4 will bring on the unit blower when demand control ventilation calls for maximum damper open, and returns to auto-blower when demand control ventilation damper returns to 0. The other modes only operate when the unit blower is on, but will not bring it on themselves.

Some applications require a different carbon dioxide set point range than default settings. Damper “start open” (Parameter 118 and “full open” (Parameter 119) carbon dioxide set points may be adjusted from 0 to 2000 ppm.
Use the following formula to determine damper travel.

NOTE – When changing carbon dioxide set point range, “start open” set point should be less than “full-open” set point.

% Damper Travel = carbon dioxide ppm – Start Open ppm X

Full Open

Start Open

Max Open (Parameter 117) Full Open – Start Open

Example: An application requires the dampers open at 800 CO2 ppm and reach full open at 1200. If the carbon dioxide level in the space reads 1000 ppm, calculate the damper percent open as follows.

% Damper Travel = 1000 – 800 or 200 or .5 =0.5 x 100 = 50%

1200 – 800 400

DEFAULT DEMAND CONTROL VENTILATION (DCV) OPERATION

Low Temp. Operation High Temp. Operation

100

40°F Parameter 75°F Parameter 121

123

66

30°F

85°F

Damper Travel: % of Maximum Open (Parameter 117

33 Min. Position

20°F

95°F

0

700

10°F Parameter 122 105°F Parameter 120 1000

Parameter 118 Parameter 119

CO2 (ppm) FIGURE 16

Page 19

TABLE 15 DEMAND CONTROL VENTILATION PARAMETERS

Control Parameter

Control Value

No.

Screen Name

Paramater Short Description

Units Min. Default Max.

Description

Demand Control

117 DCV MAX DAMPER OPEN Ventilation Maximum

0

Damper Open

100

100

%

Maximum allowed demand control ventilation damper open position.

· Damper “start open” CO2 set point for

Demand Control

Demand Control Ventilation.

118 DCV DAMP START OPEN

Ventilation Damper

0

700 2000 PPM

Start Open

· Level where fresh air damper begins to

open.

Demand Control

119

DCV DAMP FULL OPEN

Ventilation Maximum Damper Full Open Set

0

Point

1200

2000

PPM

· Damper “full open” CO2 set point for Demand Control Ventilation.
· Level where fresh air damper is opened to maximum.

Demand Control

120

DCV HI TMP OV FL CL

Ventilation Outdoor Air Control Hi Temperature

-31.0

105.0

132.0

°F

High outdoor air temp. where fresh air damper is closed to minimum position.

Override Full Closed

Demand Control

121

DCV HI TMP OV ST CL

Ventilation Outdoor Air Control Hi Temperature

-31.0

75.0

132.0

°F

High outdoor air temperature where fresh air damper begins to close.

Override Start Closing

Demand Control

122

DCV LO TMP OV FL CL

Ventilation Outdoor

Air Control Low

-31.0 10.0 132.0

Temperature Override

°F

Low outdoor air temperature where fresh air damper is closed to minimum position.

Full Closed

Demand Control

123

DCV LO TMP OV ST CL

Ventilation Outdoor

Air Control Low

-31.0 40.0 132.0

Temperature Override

°F

Low outdoor air temp. where fresh air damper begins to close.

Start Closing

IAQ input source and mode (0-3 operate only when blower is on).

0- Demand Control Ventilation System In door Air Quality. Either P298-3 or network indoor air quality.
1- Demand Control Ventilation System In door Air Quality. Either P298-3 or network Indoor Air Quality with no outdoor air temperature limits.

2- Outdoor Air Control Sensor A24 (A133_

134

IAQ INPUT MODE

Indoor Air Quality In put Mode

0

1

P194-6) (TB22-6). 6 Option 3- Outdoor Air Control Sensor A24 (A133_

P194-6) (TB22-6) with no outdoor air

temperature limits.

4- Demand Control Ventilation System In door Air Quality. Either P298-3 or network Indoor Air Quality with blower on/auto operation.
5- Demand Control Ventilation System In door Air Quality. Either P298-3 or network Indoor Air Quality with blower on/auto operation with no outdoor air temperature limits.

Page 20

1.10.4.1. Set Point Control Option
Set point control mode is commonly used in areas with high occupancy and frequent change out such as classrooms or conference rooms.
In applications requiring this on/off damper response to carbon dioxide levels, set the start open (Parameter 118 – DCV DAMP START OPEN) set point higher than the full open (Parameter 119 – DCV DAMP FULL OPEN) set point. The dampers will drive to fully-open position immediately. FIGURE 17 shows the set point control option.

IMPORTANT
Mixed air temperatures less than 45°F (7°C) on units with an aluminized heat exchanger or less than 30°F (-1°C) on stainless steel heat exchangers will void the manufacturer’s warranty.
1.10.4.2. Determining Indoor Air Quality Inputs
Go to DATA> IN/OUTPUTS > SENSORS menu selection from the M3 Unit Controller menu display.

Change Parameters 122 and 123 to set the minimum outdoor temperature limits. Change Parameters 120 and 121 to set the maximum temperature limits.

SET POINT CONTROL INDOOR AIR QUALITY OPTION

100 Parameter 117 Max. Open

Close

Open

Min. Position

Parameter 119 (full)

Parameter 118 (start)

carbon dioxide (ppm)
FIGURE 17

Page 21

TABLE 16 FREE COOLING OPTIONS

Config. ID1
(POS 2)

Unit Controller M4 Display Input (Mode) (Free Cooling Options)

Default Setting

Range Setting

Outdoor air is suitable for free cooling when:

Differential ECONOMIZER

T

Sensible

TEMP ECON TYPE

Sensor (default = TEMPERATURE

mode)

OFFSET

10ºF

0-40ºF

Outdoor air temperature (RT17) is less than return air temperature (RT16) by at least the offset value.

ECONOMIZER

T

Single Sensible TEMP ECON TYPE

Sensor

= TEMPERATURE

SETPOINT

75ºF

40-75ºF

Outdoor air temperature (RT17) is less than the Out door Air Temperature set point value.

Either of the TEMP modes (set point or offset) can be used when

ECONOMIZER TEMP

a network OAS signal is provided by an energy management or

T

Network OAS

ECON TYPE = TEMPER

Not

Not building control system, via BACnet, LonTalk, or L Connection.

ATURE OFFSET or

Applicable Applicable The network can command OAS, NOT OAS, or AUTO. AUTO

SETPOINT

returns to local control of OAS, which is the selected TEMP

mode.

S

Single Enthalpy*
Sensor

ECONOMIZER ENTHALPY SETPOINT = 12.0 MA

12.0 mA

10 mA – Outdoor air enthalpy (A7) is less than enthalpy set point 19 mA parameter.

D

Differential Enthalpy*
Sensor

ECONOMIZER ENTHALPY OFFSET = 1.0 MA

1.0 mA

1 mA – 5 Outdoor air enthalpy* (A7) is less than return air enthal py (A62) mA by at least the OFFSET value.

Mode and setpoint

are not set by Unit

Global input is energized by (P297-9). This setting is also used

G

Global

Controller.
Menu advances to: FREE COOLING

Not Applicable

Not Applicable

for outdoor air damper applications. Global input also brings on the blower. (This mode is NOT used when OAS signal is provided via network connec tion. GLO is only used when a

SUPPLY AIR SETPOINT

24VAC signal is used to energize the P297-9 GLO input.)

= 55°F

*Enthalpy includes effects of both temperature and humidity.

Economizer Start-Up – M4 Unit Controller
The unit will be equipped with either an M2, M3, or M4 Unit Controller. M2, M3, or M4 will be printed on the bottom of the Unit Controller near the SBUS connector. Use the appropriate start-up section in this manual and refer to the Unit Controller provided with the rooftop unit. Application manuals are available for all Unit Controllers.
The economizer is controlled by the Unit Controller which is located on the unit control panel. A detailed menu layout can be found in the Unit Controller manual provided with each unit.
A-Field-Installed Economizer
The Unit Controller must be set to identify an economizer has been installed. The configuration ID will also identify which sensor inputs the Unit Controller will use to determine the free cooling mode. See FIGURE 13 for sensor location.

1 – Use the Unit Controller mobile application to enter the following menu:
RTU MENU > SETUP INSTALL
2 – Navigate through various setup questions until CONFIGURATION ID 1 appears. Change the second character in the configuration ID to identify the type of input used to determine economizer free cooling setpoint. See TABLE 16.
3 – Continue through the setup until complete.
NOTE – Refer to the Setup Guide provided with the unit for Unit Controller details.
B-Adjust Free Cooling Discharge Air Setpoint
When outdoor air is suitable for free cooling, dampers will modulate to maintain a discharge air temperature of 55ºF default (adjustable range 45º- 67ºF). Refer to RT6 discharge air sensor location shown in FIGURE 13.

Page 22

C-Free Cooling Modes
The Unit Controller automatically sets the free cooling mode when the configuration ID is entered. The temperature setpoint mode is the only exception.
1 – Use the following menu path in the mobile application to enter the temperature setpoint mode.
RTU MENU > SETTINGS RTU OPTIONS > DAMPER > ECONOMIZER TEMP ECON TYPE = TEMPERATURE
OFFSET (default)
2 – Use the -/+ buttons to select TEMPERATURE OFFSET/SETPOINT.
3 – Continue through the setup. NOTE – Network OAS signal and California Title 24 Compliance options use either TEMPERATURE OFFSET or TEMPERATURE SETPT mode.
D-Adjust Outdoor Air Free Cooling Setpoint NOTE – Configuration ID 1 must be set to the appropriate mode before adjusting the free cooling setpoint. SeeTABLE 16.
Temperature Offset or Temperature Setpoint Mode 1 – After the free cooling mode is saved, press NEXT.
If default setpoint value needs to change, enter the new number and press NEXT.
2 – For California Title 24 compliance, adjust the free cooling setpoint based on:
· The climate zone where the unit is installed. See TABLE 3.
· The setpoint requirement published by the California Energy Commission. See Section 140.4 Prescriptive Requirements for Space Conditioning Systems of the 2013 Building Energy Efficiency Standards.
NOTE – Values in the referenced standard will supersede values listed in TABLE 3.
3 – When a network OAS signal is provided by a building control system, refer to control system literature to adjust free cooling setpoint.
Enthalpy Setpoint
The enthalpy sensor (A7) provides a milliamp signal to the Unit Controller based on outdoor air temperature and humidity. Use the following menu to change the setpoint:
RTU MENU > SETTINGS RTU OPTIONS > DAMPER > ECONOMIZER ENTHALPY SETPOINT = 12.0 MA

Refer to TABLE 4. At 12.0mA, the Unit Controller will allow dampers to modulate open at approximately 73°F. If the space temperature is too warm or humid, change the ECONOIZER ENTHALPY SETPOINT to “13.6MA” and
the Unit Controller will allow dampers to modulate open at approximately 70°F.
Enthalpy Offset
The Unit Controller allows damper modulation when outdoor air is lower than return air by a differential or offset temperature and humidity range. Use the following menu to change the setpoint:
RTU MENU > SETTINGS RTU OPTIONS > DAMPER > ECONOMIZER ENTHALPY OFFSET = 1.0 MA
Refer to TABLE 5. At 1.0mA, the Unit Controller will allow dampers to modulate open when outdoor air is lower than return air by approximately a 2°F offset. If return air is 76°F, the Unit Controller will allow dampers to modulate open at approximately 74°F. If the space temperature is to warm or humid, change the ECONOMIZER ENTHALPY SETPOINT to 2.0mA or an offset of 3.5°F. The Unit Controller will allow dampers to modulate open at approximately 72.5°F.
E-Damper Minimum Position Setting
Use the menu path in TABLE 17 to set the MIN DAMPER POSITION BLOWER ON HIGH when outdoor air is not suitable for free cooling. The minimum setpoint range is 0% open (dampers closed) to 100% (dampers fully open). On units with staged supply air blowers, also set the MIN DAMPER POSITION BLOWER ON LOW.

TABLE 17 DAMPER OPTIONS

Level 2 Level 3

Level 4

Level 5

ECONOMIZER ENTHALPY OFFSET = 1.20 MA

ECONOMIZER ENTHALPY SETPOINT = 1.0 MA

RTU OPTION

DAMPER

ECONOMIZER TEMP ECON TYPE = TEMPERATURE OFFSET OR TEMPERATURE SETPT
ECONOMIZER OAT SETPOINT = XX.X F
FREE COOLING SUPPLY AIR SETPOINT = 55°F

MIN DAMPER POSITION BLOWER ON HIGH = X.X %

MIN DAMPER POSITION BLOWER ON LOW = X.X %
NOTE – Menu options vary depending on hardware configuration.

NOTE – Use the “Adjust and set values” arrows to scroll up or down for selection options.

Page 23

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