Trane ReliaTel Diagnostic Manual page 126

Dehumidification with Hot Gas Reheat (3-25 Tons)
If the unit has been in cooling mode for 90 minutes, the purge sequence will switch to the
dehumidification mode for three minutes. If there is still a call for cooling, the unit will once again
switch back to cooling.
The same sequence is also true if unit is in the dehumidification mode. It will switch to cooling for
three minutes and then back to dehumidification.
A unit with dehumidification installed will operate normally if a humidity sensor or humidistat is
not installed. The compressor will switch to the dehumidification mode for a total of three minutes
after 90 minutes of compressor run time in the cooling mode.
Verification of the RH setpoint can be determined by measuring the dc voltage at TB1 and TB2 on
the RTOM.
Table 45.
Setpoint (%)
40
41
42
43
44
45
46
47
48
49
50
Calculation to convert mA to RH = (mA reading - 4) * 6.25
4mA = 0%
20mA = 100%
Example: (12mA - 4) * 6.25 = 50% RH
126
Voltage
(vdc) Setpoint (%)
0.0 51
.238 52
.455 53
.652 54
.833 55
1.00 56
1.15 57
1.30 58
1.43 59
1.55 60
1.67
Voltage
(vdc)
1.77
1.88
1.97
2.06
2.14
2.22
2.30
2.37
2.44
2.50
RT-SVD03G-EN