Expansion Valves; Measuring Superheat - Trane IntelliPak 2 Installation, Operation And Maintenance Manual

Unit Startup
Table 60. eFlex™ staging sequence and compressor data (continued)
Stage
1A: VZH 170
1 X
2 X
3 X
4 X
5 X
6 X
Stage
1A: VZH 170
1 X
2 X
3 X
4 X
5 X
6 X
Stage
1A: VZH 170
1 X
2 X
3 X
4 X
5 X
6 X
7 X
8 X

Expansion Valves

All Intellipak 2 with Symbio systems use electronic
expansion valves (EXVs) to control superheat. These
valves are factory set to 12°F of superheat to balance
efficiency and compressor reliability at all operating
conditions. This setting can be adjusted through the
Symbio controller display, but this is only recommended to
be done at the discretion of Trane Product Support.
Pressure curves included in this document are based on
outdoor ambient between 65° & 105°F, relative humidity
above 40 percent. Measuring the operating pressures can
be meaningless outside of these ranges.

Measuring Superheat

1. Measure the suction pressure at the suction line gauge
access port located near the compressor, or use the
Suction Pressure reading from the Symbio controller.
2. Using a Refrigerant/Temperature chart, convert the
158
130 Ton eFlex™ Variable Speed Compressor Standard Capacity Evaporator
1B: CSHL 346 2A: CSHL 227
X
X
X X
X X
X X
130 Ton eFlex™ Variable Speed Compressor High Capacity Evaporator
1B: CSHL 346 2A: CSHL 227
X
X
X X
X X
X X
150 Ton eFlex™ Variable Speed Compressor Standard Capacity Evaporator
1B: CSHL 346 2A: CSHL 227
X
X
X X
X
X
X X
2B: CSHL 227 2C: CSHL 227
X
X
X X
2B: CSHL 227 2C: CSHL 227
X
X
X X
2B: CSHL 169 2C: CSHL 346
X
X
X
X X
X X
pressure reading to a corresponding saturated vapor
temperature.
3. Measure the suction line temperature as close to the
suction line temp sensor as possible, or use the Suction
Temperature reading in Symbio. Use a thermocouple
type probe for an accurate reading.
4. Subtract the saturated vapor temperature obtained in
step 2 from the actual suction line temperature
obtained in step 3. The difference between the two
temperatures is known as "superheat".
When adjusting superheat, recheck the system subcooling
before shutting the system "Off".
Note: If unit includes the modulating reheat
dehumidification option, adjust superheat only in the
cooling mode of operation.
VZH Min Speed VZH Max Speed
3600 6000
1500 6000
2160 4560
1500 6000
1500 6000
1500 4620
VZH Min Speed VZH Max Speed
3780 6000
2640 6000
2160 4560
1500 6000
1500 6000
1500 4740
VZH Min Speed VZH Max Speed
4080 6000
2700 5340
3720 6000
2820 5640
1500 5040
1500 5580
1500 6000
1500 6000
RT-SVX073A-EN