Electronic Expansion Valves; Measuring Superheat - Trane IntelliPak 1 with Symbio 800 Installation, Operation And Maintenance Manual

Table 55. eFlex™ staging sequence and compressor data (continued)
Stage Comp 1A VZH170
1 X
2 X
3 X
Stage Comp 1A VZH170
1 X
2 X
3 X
Stage Comp 1A VZH170
1 X
2 X
3 X
Stage Comp 1A VZH170
1 X
2 X
3 X
Stage Comp 1A VZH170
1 X
2 X
3 X
4 X

Electronic Expansion Valves

All Intellipak1 with Symbio systems use electronic
expansion valves (EXV's) 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 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.
RT-SVX072D-EN
Comp 2A Comp 2B
X
X
55 Ton eFlex™ Variable Speed Compressor
Comp 2A Comp 2B
X
X
60 Ton eFlex™ Variable Speed Compressor
Comp 2A Comp 2B
X
X
70 Ton eFlex™ Variable Speed Compressor
Comp 2A Comp 2B
X
X
75 Ton eFlex™ Variable Speed Compressor
Comp 1B Comp 2A
X
Min Spd
1620
1500
X 2340
Min Spd
1740
1800
X 2520
Min Spd
1920
1500
X 2520
Min Spd
2220
1500
X 2220
Comp 2B
X
X X
X X

Measuring Superheat

1. Measure the suction pressure at the suction line gauge
access port located near the compressor.
2. Using a Refrigerant/Temperature chart, convert the
pressure reading to a corresponding saturated vapor
temperature.
3. Measure the suction line temperature as close to the
expansion valve bulb, as possible. 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
Unit Start-up
VZH
Max Spd
4200
4740
4800
VZH
Max Spd
4560
5280
5280
VZH
Max Spd
4740
5700
5820
VZH
Max Spd
5220
6000
6000
VZH
Min Spd
2520
1500
1500
1500
Max Spd
5160
4500
5040
5880
115