TS1 Series
Temperature Controls
Alco Controls
D A T A S H E E T
TS1__35038_EN_R05.doc 3 / 8 10.08.2011
Electrical contacts
TS1 temperature controls are equipped with high rated double
snap action contacts for shatter-free and reliable operation.
All contacts throughout this range of controls are designed as
Single Pole Double Throw (SPDT) contacts. One contact may
be used for control and the other contact for alarm/status
indication or auxilliary control.
Gold plated contacts are available on request for low electrical
loads, for example in electronic signalling applications.
For applications using a supply voltage other than 230V and for
applications using gold plated contacts, the bellows heater of
vapour charged thermostats (sensor style A, E or P – not for
frost monitors function C or D) must be disabled.
Contact function
Thermostat contacts TS1 are labelled 1-2-4 where ‘1’ refers to
the common pole, ‘2’ refers to the lower setpoint and ‘4’ refers
to the upper setpoint.
The contact function for automatic and manual reset versions is
as described below.
Automatic reset
On temperature rise above the upper setpoint, contacts 1-2
open and contacts 1-4 close. On decreasing temperature lower
setpoint contacts 1-4 open and contacts 1-2 close.
Automatic reset contact function
Manual reset low temperature
On decreasing temperature below the lower setpoint, contacts
1-4 open, contacts 1-2 close and latch. Only on pressure rise
above upper setpoint and after pressing the manual reset
button contacts 1-2 will open and contacts 1-4 will close again.
Manual reset low pressure contact function
Manual reset high temperature
On increasing temperature above the upper setpoint, contacts
1-2 open, contacts 1-4 close and latch. Only on falling
temperature below lower setpoint and
after pressing the manual
reset button, contacts 1-4 will open and contacts 1-2 will close
again.
Manual reset high temperature contact function
For operational safety, all TS1 with manual reset are designed
as trip-free controls, i.e. pressing the manual reset button while
the temperature has not reached its reset treshold will not
operate the electrical contacts.
Off-switch
TS1-B/F/H with an off-switch (TS1-B/F/H) cut off the line to
terminal 1 when in Position “STOP”.
Off-switch interrupting line to terminal 1
Bellows heater
TS1 with vapour charges, ie. sensor types A, E, P (not frost
monitors function C or D) have a bellows heater wired across
the contacts in the following way.
Bellows heater
Installation and maintenance
Controls come with an adjustment knob and a lockplate which
may be used to protect the settings by wire-seal if desired.
Range and differential spindle may be sealed independent from
each other.
A front access manual toggle is provided for checking out
control operation. All TS1 controls come with heavy duty
terminal blocks which are finger-proof and feature wire clamps
plus non-loosable terminal screws for ease of wiring.
Available accessories include mounting brackets of various
types, sensor bulb wells and capillary tube holders.
The standard mounting holes for mounting brackets are
equipped with a universal thread to fit both, M4 and UNC 8-32
screws. The standard wholesale package includes two
mounting screws.
In addition, further hole patterns for surface mounting are
provided.