Start Up
RT-SVX50F-EN
31
Coil Frost Protection
The Frostat™ control monitors the evaporator coil
temperature to prevent the evaporator from freezing due
to low operating temperatures whenever there is a
demand for cooling. When an open circuit has occurred,
the Frostat opens the 24VAC ground and opens all of the
cooling contactors.
Initiation of Operating Modes
The JADE controller is able to initiate the following modes:
Compressor, Economizer, Fans, Heating System, and
Cooling System.
The Compressor mode is initiated by either the OAT going
above the DRYBLB SET setting or by the thermostat
initiating a call to cool when the damper is at 100% open.
The Economizer mode is controlled by the MAT getting
above the MAT SET setting while the OAT is below the
DRYBLB SET setting. While the fans are not controlled by
the controller, the Fan mode is dependent on what state
the system is in (OCC or Y1 states will cause the damper to
go to a LOW fan speed damper setting, while Y2 or W
states will cause the controller to open the damper to the
HIGH fan speed damper setting). The Heating System
mode requires an input to the AUX2-1 terminal from the
thermostat, and the Cooling System mode requires an
input to the Y2 IN and/or the Y1 IN terminals from the
thermostat.
Fault Detection & Diagnostics (FDD)
Certification
The JADE controller is a certified FDD product (HJW10) by
California Title 24, Part 6.
Standard Economizer Start-Up
1. Set the minimum position setpoint for the economizer
to the required percentage of minimum ventilation
using the setpoint potentiometer located on the
Economizer Control (ECA).
The economizer will drive to its minimum position
setpoint, exhaust fans (if applicable) may start at
random, and the supply fan will start when the
SERVICE TEST is initiated.
The Exhaust Fan will start anytime the economizer
damper position is equal to or greater than the exhaust
fan setpoint.
2. Verify that the dampers stroked to the minimum
position.
3. Verify that the dampers stroked to the full open
position.
4. To stop the SERVICE TEST, turn the main power
disconnect switch to the “Off” position or proceed to
the next component start-up procedure. Remove
electro mechanical test mode connections (if
applicable).
LLE Controls Test Procedure
See unit schematic for correct wire numbers.
Use the CHECKOUT menu in the Installation Instructions
(ACC-SVN178*-EN) to test the damper operation and any
configured outputs. Only items that are configured are
shown in the Checkout menu.
To Perform Checkout Tests:
1. Scroll to the desired test in the checkout menu using
the
and
buttons.
2. Press the
button to select the item.
3. “RUN?” is displayed.
4. Press
to start the test.
5. The unit pauses and then displays “IN PROGRESS”.
6. When the test is complete, “DONE” appears.
7. When all parameters have been tested, press
(Menu Up) to end the test (e.g. turn off the relay).
Notes:
•
The checkout tests can all be performed at the time of
installation or any time during the operation of the
system.
•
JADE will be in "set up" mode for the first 60 minutes
after powered. If OA sensor or Sylk Bus device (sensor
or actuator) is disconnected during the set up mode,
the JADE will not alarm that failure. The MA sensor is
a system "critical" sensor, if the MA sensor is removed
during the set up mode, the JADE will alarm. After 60
minutes the JADE controller will change to operation
mode and all components removed or failed will alarm
in the operation mode.
•
Upon power up (or after a power outage or brownout),
the JADE controller module begins a 5 minute power
up delay before enabling mechanical cooling.
Compressor Start-Up
1. Attach a set of service gauges onto the suction and
discharge gauge ports for each circuit. Refer to the
refrigerant circuit illustration in the Service Facts.
Using the Service Test Guide, perform the proper test
mode connections.
Scroll Compressors
a. Once each compressor has started, verify that the
rotation is correct. If wired correctly the suction
pressure should drop and the discharge pressure
should rise. If a scroll compressor is rotating
backwards, it will not pump and a loud rattling
sound can be observed.
b. If the electrical phasing is correct, before
condemning a compressor, interchange any two
leads (at the compressor Terminal block) to check
the internal phasing. Refer to the following
illustration for the compressor terminal/phase