SIEMENS TH 193 HC Heating and Cooling Room Thermostat Instruction Manual
Technical Instructions
Document Number 155-068P25
February 14, 2022
Free Energy Band TH 193 HC Heating/Cooling Room Thermostat
Troubleshooting
Before troubleshooting thermostat (see Table 4), ensure that there is clean, dry supply air
at 18 psi (124 kPa) minimum. Use the test probe gauge and needle adapter to measure
the control pressure at the thermostat test port.
The output pressure test port is accessible without removing the thermostat cover through
the 8th opening from the top. For one-pipe thermostats, the port is on the right side. For
two-pipe thermostats, the port is on the left side.
Figure 9. Accessing the Output Pressure Test Port.
CAUTION:
If you use the wrong test port, thermostat damage can occur and result in
replacement of the device.
Table 3. Troubleshooting Guide.
Problem
Check
Air supply
Cause
Action
Control pressure
stays at
approximately zero
Low supply pressure As required
Nozzle or flapper Dirt on nozzle or
flapper
Clean nozzle or
replace thermostat
Restrictor
Calibration
Nozzle
Clogged restrictor
Out of calibration
Clogged nozzle
Replace restrictor
Recalibrate
Control pressure
stays at
Clean nozzle or
replace thermostat
approximately
supply pressure
Calibration
Dirt on either supply or Alternately close and
exhaust valve seat
open nozzle by gently
pushing down the
bimetal
Excessive air
leakage from
exhaust port on left
side of thermostat
Supply and return Connections are
As required
line connection
interchanged or
connection to port is
incorrect
Page 10
Siemens Industry, Inc.
| General | Details |
|---|---|
| Name | SIEMENS TH 193 HC Heating and Cooling Room Thermostat Instruction Manual |
| Make | SIEMENS |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.15 MB |
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