RT-SVX25C-EN
39
Start Up
Economizer Start-Up
ReliaTel Control
Using the Service Test Guide in
Table 6, p. 37
, momentarily jump across the Test 1 & Test 2
terminals on LTB1 one time to start the Minimum Ventilation Test.
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.
WARNING
Rotating Components!
During installation, testing, servicing and troubleshooting of this product it may be necessary to
measure the speed of rotating components. Have a qualified or licensed service individual who
has been properly trained in handling exposed rotating components, perform these tasks.
Failure to follow all safety precautions when exposed to rotating components could result in
death or serious injury.
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. Momentarily jump across the Test 1 & Test 2 terminals on LTB one additional time if continuing
from previous component start-up or until the desired start-up component Test is started.
4. Verify that the dampers stroked to the full open position.
5. 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).
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 in
Table 6, p. 37
, continue the Service Test start-up procedure for
each compressor circuit.
Momentarily jump across the Test 1 & Test 2 terminals on LTB1 one additional time if continuing
from previous component start-up or until the desired startup component Test is started.
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 identification. Do not allow the compressor
to operate backwards for more than 5 seconds. Operation for a period of time longer than
this will result in compressor damage. Copeland ( Alliance) will experience failure also. If
the compressor runs backward for an extended period, the motor winding can overheat and
cause the motor winding thermostat to open.
