Lennox Z1ECON33 (20V24) Installation Instructions Manual

HORIZONTAL ECONOMIZERS
Z1ECON33 (20V24) HIGH PERFORMANCE ECONOMIZER
Shipping and Packing List
Package 1 of 1 contains:
1 - Economizer damper assembly
1 - Outdoor air damper
1 - Return air damper
1 - Gravity exhaust damper
1 - Return Air Cover
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 - Bottom return air cover panel
Order Of Installation
Bottom return air cover
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
INSTALLATION INSTRUCTIONS FOR ECONOMIZERS
USED WITH ZC,ZG,ZH 036, 048, 060, 072, 074 UNITS
Figure 1
Application
The Z1ECON33 (20V24) high performance economizer is used
with ZC, ZG, ZH 036, 048, 060, 072, 074 units in horizontal air
discharge applications. Economizer dampers will modulate to
maintain 55°F (31°C) supply air 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. The high performance economizer is equipped
with W7220 control module A6. The default OA temperature sensor
or high limit sensor (RT26) is a CEC approved, California Title 24
fixed dry bulb device.
See Table 1 for outdoor and return air (OA and RA) sensor options.
Refer to manufacturer's instructions provided for more detail.
Sensors
Single OA Sensible
DEFAULT - approved
for CA Title 24
Single OA Enthalpy
Not approved for CA
Title 24
Differential Enthalpy
- 1 in OA & 1 in RA
Not approved for CA
Title 24
IAQ Sensor
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 sensors to the green IAQ
leads provided on the economizer control module in the filter
section as shown in Figure 9.
!
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental contact
with sharp edges.
1
TABLE 1
Dampers modulate to maintain
55 F mixed air (R1) when:
o
OA temperature (RT26)is lower
than free cooling setpoint
OA temperature and humidity (A7) is
lower than free cooling setpoint
OA temperature and humidity (A7) is
lower than RA temperature and
humidity (A62).
CO sensed (A63) is higher than
2
CO setpoint
2
CAUTION