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Package 1 of 1 contains:
1 - Economizer damper assembly
1 - Outdoor air damper
1 - Return air damper
1 - Gravity exhaust damper
1 - Horizontal blank-off panel
1 - Economizer actuator
1 - Economizer control module
1 - Outdoor air temperature sensor
1 - Hardware bag
1 - Mixed air sensor
3 - #10-14 x 3/4" screws with washer
11 - #10-16 x 5/8" screws
1 - Side economizer panel
1 - Wiring diagram label
Order Of Installation
Economizer
Mixed air sensor
Optional OA and RA sensors
Power Exhaust fans (optional)
Side economizer panel
!
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 qualified installer, service agency or the gas supplier
Form No. 18340-2P
HORIZONTAL ECONOMIZERS
STANDARD ECONOMIZERS
Cat No.(24K58)
INSTALLATION INSTRUCTIONS FOR ECONOMIZERS
USED WITH ZC,ZG,ZH 092-150 UNITS
Figure 1
Application
The standard economizer is used with ZC,ZG,ZH 092-150
units in horizontal air discharge applications. Economizer
dampers will modulate to maintain 55
when outdoor air is suitable. The mixed air temperature
sensor measures the supply air sensible temperature.
An outdoor air sensor is used to determine whether outdoor
air is suitable for free cooling. The outdoor air sensor is
factory-installed in all economizers. Other outdoor and return
air (OA and RA) sensor options are available to determine
whether outdoor air is suitable for free cooling. See Table 1
and the instructions provided with optional senors.
Sensors
*Single OA Sensible
Single OA Enthalpy
Differential Enthalpy
- 1 in OA & 1 in RA
*Single OA sensible sensor is shipped standard on economizer
INDOOR AIR QUALITY SENSOR
An IAQ sensor is used when demand control ventilation (DCV)
is specified. Damper minimum position can be set lower than
traditional minimum air requirements resulting in cost savings.
The IAQ sensor allows the economizer control module to
open dampers to traditional ventilation requirements as room
occupancy (CO
) increases.
2
For proper operation, the IAQ sensor must provide a 2-10VDC,
100 ohm impedance signal. Connect sensor leads to AQ and
AQ1 terminals on the economizer control module located in the
filter section.
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental contact
with sharp edges.
1
F (13
C) supply air
o
o
TABLE 1
Dampers modulate to maintain
55
F mixed air (R1) when:
o
OA temperature is lower
than free cooling setpoint
OA temperature and humidity is
suitable for free cooling
OA temperature and humidity is
lower than RA temperature and
humidity.
CAUTION
!
Cross Reference No. 507401-01
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Summary of Contents for Lennox 24K58
- Page 1 HORIZONTAL ECONOMIZERS STANDARD ECONOMIZERS Cat No.(24K58) INSTALLATION INSTRUCTIONS FOR ECONOMIZERS USED WITH ZC,ZG,ZH 092-150 UNITS Application The standard economizer is used with ZC,ZG,ZH 092-150 units in horizontal air discharge applications. Economizer dampers will modulate to maintain 55 F (13 C) supply air when outdoor air is suitable.
- Page 2 Economizer hood is shipped assembled. Install over Install Economizer economizer and screw in place on both sides and top Disconnect all power sources to the unit flanges. See Fig 6. Remove the following panels from the unit; Install field supplied horizontal return duct per unit - Filter door panel instructions.
- Page 3 12 pin Grommet for high economizer plug voltage power exhaust HVAC unit’s filter (J10)/ mixed air wires (optional) access door sensor plug Economizer’s outside air damper Outside air temperature sensor Side opening to be covered by side economizer panel Relief damper Figure 5 - Front View Field supplied Filter access...
- Page 4 Figure 7 - Wiring Detail Economizer Economizer Side Panel (J142, P142) Install economizer side panel to the right side of economizer, Economizer see Fig. 5 and 6. Screw panel to economizer on left side, Control Module and into door bracket on right side of panel. Caulk all seams and gaps along sides and bottom of economizer and economizer side panel sheet metal.
- Page 5 Single Enthalpy Sensing: Economizer Control Module A6 ENTHALPY CONTROL Note - The following conditions assume unit is operating during occupied period. Single Outdoor Air Enthalpy Sensing: DAMPER MINIMUM The enthalpy sensor is an optional accessory. The temperature POSITION sensor shipped with the economizer will be removed and discarded, and the enthalpy sensor field installed.
- Page 6 Table 3 DAMPER MINIMUM POSITION SETTING Measure outdoor air temperature. Mark the point on the bottom line of chart 1 and label the point “A” (40 F, 4 NOTE - 24 volts must be provided at unit 24 volt leads R and OC shown).
-
Page 7: Mechanical Cooling
CHART 1 CALCULATE MINIMUM FRESH AIR PERCENTAGE MIXED AND RETURN AIR TEMPERATURE −20 −10 −29 −23 −18 −12 −7 −1 −20 −10 −29 −23 −18 −12 −7 −1 OUTDOOR AIR TEMPERATURE DCV SET AND DCV MAX SETTING Economizer Operation The DCV SET potentiometer is factory-set at approximately 50% When the outdoor air is suitable, dampers will modulate between of the potentiometer range. - Page 8 TABLE 5 ECONOMIZER OPERATION OUTDOOR AIR IS NOT SUITABLE FOR FREE COOLING -- FREE COOL LED DAMPER THERMOSTAT DEMAND MECHANICAL COOLING UNOCCUPIED OCCUPIED Closed Closed Closed Minimum* Closed Minimum* STAGE 1 Closed Minimum* STAGE 1 *IAQ sensor can open damper to DCV max. Damper position when no occupied/unoccupied signal is available from building thermostat or energy management system.
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