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SIEMENS Powers Controls TH 192-3 Series Day Night Vent Room Thermostat Instruction Manual

TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat  
Technical Instructions  
Document Number 155-067P25  
February 11, 2022  
Troubleshooting  
Before troubleshooting the thermostat per Table 5, ensure that there is clean, dry supply  
air at 18 psi (124 kPa) for day control, and 25 psi (172 kPa) for night. 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 left side.  
Figure 10. Accessing Output Pressure Test Port.  
Table 4. 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  
line connection  
Connections are  
interchanged or  
connection to port is  
incorrect  
As required  
Siemens Industry, Inc.  
Page 11  
GeneralDetails
NameSIEMENS Powers Controls TH 192-3 Series Day Night Vent Room Thermostat Instruction Manual
MakeSIEMENS
LanguageEnglish
FiletypePDF (Download)
File size0.16 MB
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SIEMENS Powers Controls TH 192-3 Series Day Night Vent Room Thermostat Instruction Manual