Tekmar 153 Data Brochure

- Data Brochure
Mixing Setpoint Control 153
The tekmar Mixing Setpoint Control 153 is a microprocessor-based control with a floating action output
intended to operate a mixing valve, damper, etc. through an actuating motor.
This reliable and versatile control has an adjustable throttling range and a very wide setpoint range that
F C
1
makes it useable in many different applications. The control has a digital LCD window that normally shows
Supply(1) O C Throttling Return(2
the actual sensor temperature and can be used to view the setpoint and other programmed settings.
A Universal Sensor 071 is supplied with the control. The wire to the sensor may be extended for any length
up to 500 ft. (150m) by standard 18 AWG low voltage wire. When an optional return sensor is added, a
minimum boiler return temperature can be constrained. The display will indicate a sensor fault whenever
the sensor is disconnected or short circuited, or the return sensor is short circuited.
Technical Data
Technical specifications
Dimensions — 2-7/8" x 4-3/4" x 7/8"
(74 x 120 x 22 mm)
Gross Weight — 1 lb (450g)
Ambient — –20 to 120°F (–30 to 50°C)
< 90% RH non-condensing
Power supply — 20 to 28Vac, 60 Hz, 3VA,
class II transformer
Relay capacity — SPST, 24Vac, 10 amp resistive
— 10 kΩ @ 77°F (25 ± 0.2°C),
Sensor
curve 3, NTC thermistor
accurate with up to 500 ft.
(150m) of 18 gauge wire
— ± 0.5°F ( ± 0.3°C) at
Control accuracy
70°F (21°C)
Settings
Temperature Display — –85 to 302°F (–65 to 150°C)
Supply (1) Setpoint — –40 to 239°F (–40 to 115°C)
Throttling Range — 16 to 67°F (9 to 37°C)
Boiler Return (2) — –40 to 239°F (–40 to 115°C)
Temperature Scale — Fahrenheit/Celsius
Program settings — Ten year memory backup
Sequence of Operation
• When the Mixing Setpoint Control 153 Floating Action is powered-up the digital display will show all of the display elements. The
control will then monitor sensor Supply (1) temperature. If a Boiler Return (2) sensor is connected, pressing and releasing the
Item button will toggle the display between Supply (1) and Boiler Return (2) temperature readings.
Floating Action Operating Mode
• If the relay Open (O) is constantly on, the measured temperature is at least
1/2 the throttling range setting below the setpoint. The mixing valve should
be opening or fully opened because more heat is required.
• If the relay Close (C) is constantly on, the measured temperature is at least
1/2 the throttling range setting above the setpoint. The mixing valve should
be closing or fully closed.
• Floating Action occurs when the measured temperature is between these two
points (Throttling range).
Programming
mode indicator
Date
S/N
Relay operation
indicators
Item
Identifiers
Item selection and
display button
24V only
1
Power
C
Wiring Chamber;
Terminals for 24Vac
power supply and
control circuit
to actuating motor
Hole for mounting screw
Mixing Setpoint
Control 153
Floating Action
F C
PRGM
1
2
O
Supply (1) C Throttling Return (2)
Item
Power supply: 24V 60Hz 3VA
Relay capacity: 24V 10A
No Power
6 7
2 3 5
4
Com Sup
R R' Open Sen Sen Sen
Close
Hole for mounting screw
24 Vac Floating Action
Desired
Temperature
Setting
BOTH
RELAYS OFF;
NO VALVE
MOVEMENT
Time
D 153
07/93
Temperature and
Throttling range
Display
°C or °F
indicators
Programming and
display buttons
8
Ret
Wiring Chamber;
Terminals for
Sensor(s)
CLOSE RELAY ON
Throttling
Range
OPEN RELAY ON