TS1 Series
Temperature Controls
Alco Controls
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10.08.2011
Charges and sensor types are matched to temperature ranges
and other application specific characteristics. TS1 thermostats
come with two charge types: vapour and adsorption charges.
The application temperature range covered by each charge
type is shown below:
Vapour charge – Sensor type A, E, P
These sensing elements always sense from the coldest point on
the capillary, coil, bulb or power element head. For proper
operation it must be ensured that this coldest point is at the
sensor portion which is exposed to the medium tempereature to
be sensed. The sensing location should be at least 2K colder
than the other parts of the thermal system.
In order to avoid unwanted effects of heat transfer, e.g. from a
cold wall, ALCO vapour charged thermostats come with an
integrated bellows heater (not for frost monitors), which is rated
for 230V applications. For other applications the heater must be
disabled, alternatively, a bellows heater with a different rating
may be available.
In addition to the bellows heater, room thermostats are supplied
with an insulation console for the same reason.
Sensor type ‘A’ is a coiled bulb sensor with two meter capillary,
which may be used with or without a bulb well. Style ‘E’ is a coil
sensor for space temperature sensing, and type ‘P’ is a capillary
type of sensor which can be wrapped around a heat heat
exchanger’s surface in order to sense the coldest point on the
heat exchanger for frost protection applications.
Vapour charges respond faster to temperature changes than
adsorption and liquid charges.
Adsorption charge – sensor type F
Adsorption charged sensor types operate on the basis of a
temperature dependent adsorption material, which is located
inside the bulb only. Therefore these sensor types always
respond to temperature changes at the bulb only. This makes
them suitable to applications where it is not always defined
which part of the thermal system the coldest point is (cross
ambient applications). An example for such applications is
defrost control.
Adsorption charges are slower in response to temperature
changes than vapour charges.
Setpoints
TS1 are adjustable controls with adjustment spindles for range
and differential*. By turning the range spindle, the
upper
setpoint
is defined and by adjusting the differential spindle, the
differential and hence the
lower setpoint
is defined.
The dependency between upper and lower setpoint is always
as follows:
lower setpoint = upper setpoint – differential
The following two rules should be kept in mind:
•
an adjustment of the range spindle always affects both,
upper and lower setpoint.
•
an adjustment of the differential spindle affects the lower
setpoint, only.
The following diagrammes depict this dependency:
Effect of turning range spindle
Effect of turning differential spindle
The controls are equipped with display scale and pointers to
indicate the approximate settings. Top operated controls have
display scales in units °C and °F, front operated controls have a
display scale in units °C.
For precise setting of the controls, external thermometers must
be used.
*) Manual reset controls and some other controls have a fixed
differential and no differential spindle
= constant
= variable
-100
-50
0
50
100
150
200
Adsorption Charge
Vapour Charge
