CM31 & CM37
ANALOGUE CHRONOTHERMS
PRODUCT SPECIFICATION SHEET
FEATURES
∙Attractive modern styling
∙Easy to use programming controls
∙Quartz crystal clock with 12 hour clock face, hour and minute hands
∙CM31 has 24 hour programme with 96 programming tappets (15 minute steps)
∙CM37 has 7 day programme with 168 programming tappets (1 hour steps)
∙P+I temperature control
∙± 0.5°C control differential
∙Two temperature levels (Comfort and Economy)
∙Comfort temperature range 10 to 30°C
∙Economy temperature range 5 to 25°C
∙Choice of operating modes : Automatic / Comfort / Economy
The CM31 and CM37 chronotherms are designed to provide automatic time and temperature control of heating systems in the home.
CM31 is a simple to use battery powered analogue clock-thermostat with electronic temperature control and 24 hour programming capability.
CM37 has the same features as CM31 but with the addition of a 7 day clock programme.
Both products meet the requirements of CE.
∙Battery powered by 2 AA size (LR6) alkaline cells
∙Battery life 1 year (nominal)
∙24...240 V SPDT potential free contacts for wide flexibility of application
∙Normally-closed (nc) contact terminal protected by break-off tab to guide installer in 2 wire applications
∙8 A resistive, 3 A inductive switch rating
∙Batteries supplied
∙Replaceable clock module
−24 hour clock, part number R42009899-001
−7 day clock, part number R42009899-002
EN0R 8502 R1
CM31 & CM37 CHRONOTHERMS
SPECIFICATIONS
Product |
: CM31 is a 24-hour analogue clock |
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thermostat |
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CM37 is a 7-day analogue clock |
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thermostat |
Power supply |
: 2 x 1.5 V IEC LR6 (AA) Alkaline batteries |
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Battery life |
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12 months minimum |
Switch type |
: SPDT (potential free) latching relay |
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Switch rating |
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24...230 V~, 50...60 Hz, 8 A resistive; |
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3 A inductive @ 0.6 pf |
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100,000 operations |
Time switch |
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Quartz crystal clock |
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12 hour clock face |
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24-hour programme for CM31 |
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7-day programme for CM37 |
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Clockwise setting only |
Clock accuracy : 1 minute 30 seconds per year |
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clock drift ±1 second /day @ 25°C |
Programme |
: CM31 has 96 tappets (15 minute |
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intervals) Minimum programme interval |
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15 minutes (1 tappet) |
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: CM37 has 168 tappets (1 hour intervals) |
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Minimum programme interval 2 hours (2 |
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tappets) |
Operating |
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Automatic |
modes |
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Manual (Comfort/Economy) |
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setting by slider |
Temperature |
: Comfort setpoint 10 to 30°C |
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setting |
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Economy setpoint 5 to 25°C |
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setting by rotary knob |
ORDERING SPECIFICATION
T6631B1005 - CM31 with 24 hour clock programme
T6637B1009 - CM37 with 7 day clock programme
DIMENSIONS
Temperature |
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P+I electronic control, with fixed cycle |
control |
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rate of 6 cycles/hour (nominal) |
Control form |
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ON/OFF |
Control |
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±0.5 °C @ 3 °C /hour, at 20°C, 50% |
differential |
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load, 8 A |
Comfort setpoint : |
±1.0°C |
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accuracy |
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Minimum |
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2 minutes |
ON/OFF period |
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Wiring |
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up to 2 x 0.75 to 2.5 mm2 wiring |
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connections |
Dimensions |
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135 x 90 x 29 mm (w x h x d) |
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135 x 178 x 29 mm (w x h x d) (flap |
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open) |
Environmental |
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Operating temperature range 0 to 40°C |
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Shipping and storage temperature range |
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-20 to 55°C |
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Humidity range 0 to 90% rh, non- |
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condensing |
Protection class |
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IP30 |
Approvals |
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Meets the requirements of CE. |
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Relevant standards EN60730-1 (1995), |
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EN55014-1 (1997), EN55014-2 (1996). |
EN0R 8502 R1 |
2 |
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