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WC-IOM-7 • Packaged Heat Pump 38
Economizer Start-Up
ReliaTel Control
Using the Service Test Guide in Table 5, p. 35, 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.
ƽWARNING
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 5, p. 35, 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 start-up component Test is started.
Start Up