Troubleshooting Guide -
Tranquility
®
Digital (DXM2) Packaged Units
Rev.: 01/15/14
24
Geothermal Heat Pump Systems
Typical Water Source Refrigeration Circuit (Heating Cycle)
A-G
To
Water Heater
Compressor
TXV
Coax
To Loop
Source
HWG
Reversing
Valve
Air
Coil
Suction
Discharge
Condenser:
- Condenses
- Subcools
Evaporator:
- Evaporates
- Superheats
Airflow
Filter
Drier
LT2:
Heating Liquid Line
(High Pressure Liquid)
LT1:
Low Pressure Liquid
Vapor
Compressor:
- Increases pressure
- Increases temperature
- Superheats
Pressure Drop
Temperature Drop
High Pressure Vapor
Low
Pressure
Vapor
15 - 22° Drop in Cooling
20 - 30° Rise in Heating
(Will vary on CFM setting)
(30° Minimum Temperature
Differential)
7° ∆ T Heating
10° ∆ T Cooling
Desuperheater
5-10° ∆ T
Model GPM
Pressure Drop (psi)
30°F* 50°F 70°F 90°F
024
Rev B
2.5
3.0
3.8
4.5
6.0
0.8
1.2
1.8
2.7
3.9
0.3
0.6
1.1
1.6
2.8
0.2
0.5
0.9
1.2
2.2
0.2
0.5
0.8
1.2
2.0
030
3.0
3.8
4.5
6.0
7.5
1.7
2.3
2.7
3.8
5.1
0.9
1.2
1.6
2.4
3.5
0.8
1.1
1.4
2.2
3.1
0.8
1.1
1.4
2.1
2.9
036
Rev B
4.0
6.0
6.8
8.0
9.0
0.6
1.8
2.3
3.2
4.0
0.1
1.0
1.5
2.2
2.9
0.1
0.7
1.1
1.8
2.4
0.1
0.7
1.1
1.7
2.3
042
3.8
5.3
7.5
7.9
10.5
1.7
2.7
4.5
4.8
7.4
1.0
1.8
3.1
3.4
5.4
0.9
1.6
2.8
3.1
4.9
0.9
1.5
2.6
2.9
4.7
048
4.5
6.0
6.8
9.0
12.0
1.4
2.0
2.5
4.0
6.5
1.1
1.7
2.1
3.4
5.5
0.9
1.4
1.8
3.0
4.9
0.8
1.3
1.7
2.7
4.5
060
Rev B
6.0
7.5
9.0
12.0
15.0
1.2
2.1
3.1
5.4
8.1
0.9
1.7
2.5
4.6
7.0
0.8
1.5
2.3
4.2
6.4
0.8
1.4
2.2
3.9
6.1
* Based on 15% methanol antifreeze solution
TZ Coax Water Pressure Drop
TE Coax Water Pressure Drop
Model GPM
Pressure Drop (psi)
30°F 50°F 70°F 90°F
026
4.0
6.0
7.0
8.0
1.5
3.1
4.1
5.1
1.3
2.6
3.4
4.3
1.1
2.3
3.0
3.8
1.0
2.1
2.7
3.4
038
4.0
6.0
8.0
9.0
1.2
2.6
4.5
5.7
1.0
2.5
4.2
5.2
0.8
2.3
4.0
4.8
0.6
2.1
3.7
4.4
049
5.5
8.3
11.0
12.0
1.1
2.2
3.9
4.5
0.9
2.1
3.6
4.2
0.8
2.0
3.2
3.8
0.7
1.8
3.1
3.5
064
7.0
10.5
14.0
15.0
0.5
1.9
3.9
4.8
0.3
1.8
3.5
4.3
0.2
1.7
3.2
3.9
0.1
1.6
2.9
3.5
072
7.5
11.3
15.0
17.0
1.7
3.9
6.9
8.9
1.5
3.4
6.0
7.7
1.3
3.0
5.4
6.9
1.3
2.8
5.0
6.5
LT1 to LWT in Heating
TZ Units 5°-10° Difference
TE Units 0°-5° Difference
LWT will be colder!