User Manual

Siemens Building Technologies CA1N1223en / 08.06.2011
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Immersion thermostats
TTM2D
TTW2D
with adjustable switching differential,
for control and monitoring of CHW and LTHW
Immersion thermostats for the control and monitoring of chilled water (CHW) or
low temperature hot water (LTHW) temperatures
• Switch-over contact AC 250 V / 10(2) A
• Measuring range –10 ... 80 °C or 20 ...150 °C
• Pocket length 150 mm
• Adjustable switching differential
The TTM2D and TTW2D immersion thermostats are typically used for monitoring cold
and hot water temperatures in pipe systems. When the water temperature rises to the
selected setpoint, the thermostat switches over.
2 types are available. They differ in the temperature range and in the pocket length.
Type Pocket length Measuring range Weight
TTM2D
150 mm –10 ... 80 °C 0.53 kg
TTW2D
150 mm 20 ...150 °C 0.52 kg
The immersion thermostats and, if required, stainless steel pockets (instead of the
standard brass pockets) must be ordered separately.
When placing an order, please specify the quantity, product description and type code.
Example:
1 immersion thermostat TTW2D and 1 pocket Z619
The sensor in the immersion thermostat TTM2D or TTW2D... operates according to
liquid expansion principles. When the water temperature rises to the preselected
setpoint, the thermostat switches over.
To adjust the two settings, remove the housing cover.
TTM2D
TTW2D
Switching
differential Δt
2 ...12 K
2 ...12 K
Setpoint Xk
–10 ... 80 °C
20 ... 150 °C
Use
Type summary
Ordering
Technical design
Adjustments