Sequence of Operation
RT-SVX21AC-EN 67
ReliaTel™ Control: Using the Service Test Guide in
Table 16, p. 51, momentarily jump across the Test 1 and
Test 2 terminals o
n LTB1 one time to start the Minimum
Ventilation Test.
Electromechanical Control: Using the Service Test
Guide perform the proper test mode connections.
1. Set the minimum position setpoint for the economizer
to the required percentage of minimu
m ventilation
using the setpoint potentiometer located on the
Economizer Control (ECA).
The economizer will drive to its minimum position
setpo
int, e
xhaust 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
.
ReliaTel™ Control:
Momentarily jump across the Test 1 and Test 2
term
inals on
LTB1 one additional time if continuing
from previous component start-up or until the desired
start-up component test is started.
Electromechanical Control:
Using the Service Test Guide perform the proper test
mo
de connections.
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
electromechanical 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.
ReliaTel™ Control:
Momentarily jump across the Test 1 and Test 2
ter
minals on LTB1 one additional time if continuing
from previous component start-up or until the desired
start-up component Test is started.
Electromechanical Control:
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 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
co
ndemning
a compressor, interchange any two
leads (at the compressor Terminal block) to check
the internal phasing. If the compressor runs
backward for an extended period (15 to 30 minutes),
the motor winding can overheat and cause the
motor winding thermostat to open.
2. After the compressor and cond
enser fan have started
and operated for approximately 30 minutes, observe
the operating pressures. Compare the operating
pressures to the operating pressure curve in the
Service Facts.
3. Check system super
heat. Follo
w the instruction listed
on the superheat charging curve in the Service Facts.
Superheat should be within ±5 F of the superheat chart
va
lue.
4. Repeat steps 1 through 4 for each refrigerant circuit.
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
electromechanical test mode connections (if
applicable).
Dehumidification Option
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been properly
trained in handling live electrical components perform
these tasks.
WARNING
Rotating Components!
Failure to follow all safety precautions below could
result in rotating components cutting and slashing
technician which could result in death or serious injury.
During installation, testing, servicing and
troubleshooting of this product it may be necessary to
work with live and exposed rotating components. Have
a qualified or licensed service individual who has been
properly trained in handling exposed rotating
components, perform these tasks.
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been properly
trained in handling live electrical components perform
these tasks.
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