Common Installation Issues And Concerns - Honeywell JADE W7220 Installation Instructions Manual

COMMON INSTALLATION ISSUES AND CONCERNS

Area Issue or Concern
Configuration Are the old sensors in the
unit (C7400A, C7150 or
C7232) compatible with the
economizer controller?
The unit has a W7459
economizer and black
motor. Do I need to change
the motor?
Wiring I have 4 terminals on my
actuator and the wiring only
shows 3 wires.
There is an Earth Ground
terminal. Do I need to wire
to earth ground?
What are the part numbers
of the 2 and 6 pin side
connectors?
Operation or My outdoor temperature
Use reading on the STATUS
menu is not accurate.
If my enthalpy sensor drifts
in accuracy over time, can I
re-calibrate it?
Can I go back to factory
defaults and start over?
Will I be able to see the LCD
screen when it is in the unit?
What is a good setpoint for
the Mixed Air Temperature
(MAT)?
I am using enthalpy
sensors. Why did the control
ask me to input a dry bulb
changeover temperature?
In checkout, the outdoor
damper closes when I
command it open.
How do I set my minimum
position?
What if my damper does not
go completely closed in the
checkout operation?
How do I set the OCC?
Does the economizer save
my program values if the
unit loses power?
Table 2. Installation Issues and Concerns.
No, the C7400A and C7150 sensors are not compatible with the W7220. The
enthalpy sensor for the W7220 is the C7400S. The Mixed Air or Outdoor air dry
bulb sensors are the C7250A. The C7232 CO
W7220.
If you have a W7459 economizer with a M7415 motor you will need to change to a
M7215 motor. The W7220 has a 2 to 10 Vdc out to the motor, so you will need a
M7215 motor. The M7215 motors are used with the W7212 economizers. So if you
have one of these units, you will not have to change the motor.
The economizer 24 Vac COM can be wired to the Honeywell actuator common
( or TR1). The actuators have internal ground circuits.
Yes, the economizer must be wired to earth ground.
The 2-pin connectors are Honeywell part number 50048926-001 and the 6-pin
connectors are Honeywell part number 50048926-002. Both are available in
accessory bags of 20 each.
Check the sensor wiring. Enthalpy sensors are to be wired to the Sylk Bus
terminals. Temperature sensors are to be wired to the OAT and MAT terminals.
The sensors are not able to be re-calibrated in the field. However there is a menu
item under the ADVANCED menu where you are able to input a limited offset in
temperature and humidity for each sensor you have connected to the economizer.
Under the SYSTEM SETUP menu you can change the setpoints to the factory
defaults.
The LCD screen has a backlight that is always illuminated.
The mixed air temperature is the temperature of air that you want to supply to the
space. In a commercial building, this is between 50 to 55°F (10 to 13°C). The
mixed air is the mixing of the return air and the outdoor air.
In the event 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.
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.
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.
Check the damper linkage or hub to make sure the damper is able to close
completely.
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).
Yes, once the changes are stored in the controller they will be stored until they are
changed by the operator.
7
JADE™ ECONOMIZER MODULE
Possible Cause and Remedy
sensor is compatible with the
2
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