Compressor Startup; Gas Heat Units; Dip Switch Settings; Final System Setup - Trane Precedent YZC036E Installation, Operation And Maintenance Manual

from previous component startup or until the desired
startup component test is started.
1. Verify that the dampers stroked to the full open
position.
2. To stop the SERVICE TEST, turn the main power
disconnect switch to the "Off" position or proceed to
the next component startup procedure. Remove
electromechanical test mode connections (if
applicable).

Compressor Startup

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
terminals on LTB1 one additional time if continuing
from previous component startup or until the desired
startup component test is started.
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
condemning 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 condenser 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 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
disconnect switch to the "Off" position or proceed to
the next component startup procedure. Remove
electromechanical test mode connections (if
applicable).

Gas Heat Units

Open the main disconnect switch to shut the unit off and
to reset the RTRM.
RT-SVX46G-EN
ReliaTel™ Control:
Follow the Test Guide in
p. 42 to start the unit in the heating mode. Momentarily
jump across the Test 1 and Test 2 terminals on LTB1 one
additional time if continuing from previous component
startup or until the desired startup component Test is
started.
When starting the unit for the first time or servicing the
heaters, 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.

Dip Switch Settings

Verify that the dip switch settings match the unit model as
indicted in Figure 69 through
Figure 69. 3T ultra high efficiency unit
1 – OFF
2 – OFF
3 – OFF
4 – OFF
5 – OFF
6 – OFF
CN108 CN105
Figure 70. 4T ultra high efficiency unit
1 – OFF
2 – OFF
3 – ON
4 – OFF
5 – OFF
6 – ON
CN108 CN105
Figure 71. 5T ultra high efficiency unit
1 – OFF
2 – OFF
3 – ON
4 – OFF
5 – ON
6 – OFF
CN108 CN105
(a) For YZC060E3 dip switch settings, reference RT-SVD007*-EN.

Final System Setup

After completing all of the pre-start and startup
procedures outlined in the previous sections (i.e.,
operating the unit in each of its Modes through all
available stages of cooling and heating), perform these
final checks before leaving the unit:
Unit Startup
Table 9,
Figure 71.
CN101
CN102
CN107
CN101
CN102
CN107
(a)
CN101
CN102
CN107
45