36
b. If the electrical phasing is correct, before condemning a com-
pressor, interchange any two leads (at the compressor Ter-
minal block) to check the internal phasing. Refer to the illustra-
tion in Figure 5-1 for the compressor terminal/phase identifi-
cation. If the compressor runs backward for an extended pe-
riod (15 to 30 minutes), the motor winding can overheat and
cause the motor winding thermostat to open.
2. After the compressor and condenser fan have started and
operated for approximately 30 minutes, observe the oper-
ating pressures. Compare the operating pressures to the
operating pressure curve in the Service Facts.
3. Check system superheat. Follow the instruction listed on
the superheat charging curve in the Service Facts.
Superheat should be within ±5 F of the superheat chart
value.
4. Repeat steps 1 through 4 for each refrigerant circuit.
5. To stop the SERVICE TEST, turn the main power discon-
nect switch to the “Off” position or proceed to the next
component start-up procedure. Remove electro mechani-
cal test mode connections (if applicable).
Dehumidification Option
Momentarily jump across the Test 1 and Test 2 terminals of
the LTB1 until the unit enters test mode 7. (See Table 6.)
Once the unit is in the reheat test mode, verify that the 3 way
valve has shifted to the reheat position and that the supply
temperature rises 10 deg F more than when in cooling
mode stage 2. Monitor the suction pressure for 15 minutes.
The suction pressure should remain within 5 psi of normal
cooling operation. If the unit has a 2 speed Outdoor fanand
if the Outdoor air temperature is below 70° F, verify that the
OD fan is in low speed.
Gas Heat Units
Open the main disconnect switch to shut the unit off and to
reset the RTRM.
Follow the Test Guide in Table 6 to start the unit in the heat-
ing mode. ReliaTel Control Momentarily jump across the
Test 1 & Test 2 terminals on LTB1 one additional time if con-
tinuing from previous component start-up or until the de-
sired start-up component Test is started.
Start-Up
Electro Mechanical Control
Using the Service Test Guide perform the proper test mode
connections
When starting the unit for the first time or servicing the heat-
ers, it is a good practice to start the heater with the main gas
supply turned “Off”.
Once the ignition system and components have been
checked, open the main power disconnect switch to reset
the unit.
Final System Setup
After completing all of the pre-start and start-up procedures
outlined in the previous sections (i.e., operating the unit in
each of its Modes through all available stages of cooling &
heating), perform these final checks before leaving the unit:
[ ] Program the Night Setback (NSB) panel (if applicable) for
proper unoccupied operation. Refer to the programming
instructions for the specific panel.
[ ] Verify that the Remote panel “System” selection switch,
“Fan” selection switch, and “Zone Temperature” settings
for automatic operation are correct.
[ ] Inspect the unit for misplaced tools, hardware, and debris.
[ ] Verify that all exterior panels including the control panel
doors and condenser grilles are secured in place.
[ ] Close the main disconnect switch or circuit protector
switch that provides the supply power to the unit’s termi-
nal block or the unit mounted disconnect switch.
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting
of this product, it may be necessary to work with live
electrical components. Have a qualified licensed electri-
cian or other individual who has been properly trained in
handling live electrical components perform these tasks.
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
Make sure all personnel are standing clear of the unit before
proceeding. The system components will start when the power
is applied.