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Small beige pneumatic thermostat with barb fittings and mounting plate

SIEMENS

SIEMENS 192-203 Pneumatic Thermostat Heating Cooling

SKU CH-1PBA-BAYXQ

Pneumatic thermostat provides single-temperature heating and cooling control with a 45 to 85 degrees F range and 3 to 15 psi throttling

  • Controls 45 °F to 85 °F range with bi-metal element
  • Operates on 3 to 15 psi control air pressure
  • Reverse-acting 2-pipe design handles heating and cooling
  • Mounts vertically with included plate and 5/32 in barbs
  • Rated for 30 psi max pressure and 140 °F ambient

Pneumatic Thermostat for HVAC Systems

This SIEMENS 192-203 pneumatic thermostat provides single-temperature control for heating and cooling in two-pipe systems. It operates on a 3 to 15 psi control air pressure range with a bi-metal sensing element. The unit mounts vertically and includes a mounting plate for installation.

Reverse-Acting Two-Pipe Replacement

The reverse-acting design replaces outdated pneumatic stats that lack combined heating and cooling function in one body. Upgrading is worthwhile when existing controls cannot maintain the 45 to 85 degrees F range or when air consumption exceeds the 20 scim rating. The 30 psi maximum pressure rating handles standard building pneumatic mains.

Vertical Mount with Barb Connections

The thermostat fits panels or walls using the supplied mounting plate and accepts 5/32 inch barb air connections for tubing. Its compact 3 3/8 by 2 1/8 by 1 5/8 inch profile suits tight mechanical rooms. The 140 degrees F maximum ambient temperature allows placement near hot equipment without derating.

Highlights

  • Controls 45 °F to 85 °F range with bi-metal element
  • Operates on 3 to 15 psi control air pressure
  • Reverse-acting 2-pipe design handles heating and cooling
  • Mounts vertically with included plate and 5/32 in barbs
  • Rated for 30 psi max pressure and 140 °F ambient

Specifications

BrandSIEMENS

Questions about this item

What air line size fits the 5/32 in barb connections on this thermostat?

The unit uses 5/32 inch barb fittings, so 5/32 in pneumatic tubing is required for a secure seal.

Which step is often missed when mounting the 192-203 vertically?

The included mounting plate must be fastened first; the thermostat then snaps onto that plate — skipping the plate leaves the unit loose.

How often should the bi-metal element be checked given the 140 °F maximum ambient rating?

Inspect the bi-metal element annually; sustained exposure near 140 °F can accelerate calibration drift and require earlier replacement.

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