jablotron TP-89 Quick Start Manual Download Page 1

TP-89 digital bus thermostat 

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MKL51701 

The TP-89 digital bus thermostat

The TP-89 is an indoor thermostat which can be used to set and 

measure the temperature in a room. The thermostat is designed to 
work exclusively in combination with 

AC-8007 / AC-8014 / AC-814

 

receivers. Temperature adjustment can be performed simply by turning 
the setting knob. This knob can be locked to avoid accidental setting. 
The thermostat does not use any programmed scheduling. The 
following features are also available: 

• 

Anti-freeze protection

 – any drop in temperature under the 

(configurable) 

AL Lo

 value is detected and signalled to the 

receiver, causing the receiver’s FRE output terminal to be activated. 

• 

Floor temperature detection

 – the thermostat is equipped with an 

input terminal for the connection of a temperature sensor such as 
the TS-80. This is especially suitable for under-floor heating control 
– by placing the sensor directly into the floor heating regulation can 
be performed with higher precision. As a result, using the TP-89 
and the TS-80 in combination allows for a comfortable floor 
temperature with no additional risk of damaging the floor. 

 

 

Tab

Button

 

 

 Installation and enrollment 

The TP-89 should be mounted in a dry indoor location. Choose a 

mounting location about 1.5 meters above the floor in an area with 
good air circulation. Avoid places with draughts, dead air spots and 
radiant heat from the sun or appliances. 

1.  Release the upper cover by pressing the plastic tab on the bottom 

side of the housing 

2.  Mount the back part on to the desired location. 
3.  Connect the receiver’s digital bus jumper to the BUS terminals. 

The polarity is irrelevant. 

4.  Should a floor sensor be used, wire it to the SEN terminals. 
5.  Close the thermostat. 
6.  Enroll the thermostat to the receiver by pressing and holding the 

knob for 5 seconds. The receiver must be in enrollment mode (see 
the AC-8007/8014/814 manual). 

 Configuring the fixed parameters 

The thermostat works with the following temperature thresholds:  

t Lo 

(economic),

 t Hi

 (comfort), 

AL Lo

 (fault/freeze), 

FL Lo

 (floor low 

temperature) and 

FL Hi 

(floor high temperature). Each of the 

parameters is configurable within a corresponding temperature range – 
see the table below. 

You can enter the adjustment menu by keeping the knob pressed for 

10 seconds. Scrolling the menu is done by turning the knob. The 
display will show temperature parameter names – see the table below. 
The currently displayed parameter can be adjusted by pressing the 
knob briefly, turning the knob until the desired temperature is 
displayed, and confirming the setting by re-pressing the knob (this will 
also cause a return to the menu so that you can configure other 
parameters immediately). The adjustment menu is escaped from by 
pressing the knob while 

OK

 is displayed or automatically after 30 

seconds. The parameter ranges are restricted according to the table. 

 

Parameter 

Adjustment range 

Factory 

Description 

SPAN 

0.1°C;0.2°C;0.5°C 0.2°C 

Hysteresis 

for 

switching 

t Lo 

+6°C to +40°C* 

6°C 

Economic 
temperature 

t Hi 

+6°C to +40°C* 

40°C 

Comfortable 
temperature 

AL Lo 

-9°C to +20°C 

3°C 

FRE 

(freeze) 

output to ON 

AL Hi 

+30° to +70°C 

60°C 

Not applicable 

FL 

ON/OFF OFF 

Floor sensor 

ON/OFF 

FL Lo 

+6°C to +40°C* 

22°C 

Lower floor-

temperature 

threshold 

FL Hi 

+6°C to 40°C* 

27°C 

Upper floor-

temperature 

threshold 

FL t 

Current temperature of the floor (displayed after 

pressing the knob) 

Corr 

±

1°C 

0 Correction 

 

t Lo

 to 

t Hi

 and 

FL Lo

 to 

FL Hi

 must be valid ranges: 

t Lo

 must not 

be greater than 

t Hi

  and 

FL Lo

 must not be greater than 

FL Hi

 

Adjustment ranges as depicted on a coordinate axis: 

Temperature regulation range

AL Lo

t Lo

FL Lo

t Hi

FL Hi

20

9

 

 

Temperature accuracy adjustment:

 The thermostat allows you to 

configure the hysteresis – the accuracy to which the temperature is 
regulated. The setting is done via the 

SPAN 

item in the adjustment 

menu (proceed the same way as with the threshold parameters 
mentioned above). Turning the knob lets you select one of the 
following accuracy ranges: ±0.1˚C, ±0.2˚C or ±0.5˚C (the factory 
default setting is ±0.2˚C). 

Example: 

If the accuracy is adjusted to ±0.5˚C and the temperature is 

set to 24˚C, the thermostat switches the heating on when the 
temperature drops below 23.5˚C and it switches it off if the 
temperature goes above 24.5˚C. In reality the temperature scatter can 
be slightly higher because of the temperature persistence of the room.

 

Warning: too high an accuracy can cause the heating to turn on 

and off too frequently. 
Temperature measurement correction:

 Possible temperature 

measurement offsets can be corrected via the 

Corr

 item in the 

adjustment menu. The range of adjustable corrections is 

±

1°C.

 

 Manual operation 

• 

When not being handled, the thermostat shows the current 
temperature in the room. 

• 

By turning the knob the desired temperature can be set

 from 

t Lo

 

to 

t Hi

 (during setting, a hand symbol is shown on the display). If 

the temperature cannot be set, see “Locking the thermostat”. 

Setting the 

t Lo

 and 

t Hi

 limits allows the installer to prevent the 

regulated temperature from being set to undesirably high or low 
values by manual operation. 
Example: 

If t Lo = +15°C and t Hi = +22°C then the regulation 

temperature can only be set within the range of +15 to +22°C 
(unless the adjustment menu is entered).

 

• 

If you stop turning the knob the current temperature in the room will 
be displayed again (3 seconds after the last movement of the 
knob). 

• 

If the 

current temperature is lower than the desired 

temperature minus the hysteresis

, the thermostat will switch the 

heating on (a symbol of wavy lines will appear on the display). 

• 

If the 

current temperature is higher than the desired 

temperature plus the hysteresis

, the thermostat will switch the 

heating off (the symbol of wavy lines will disappear). 

 Floor heat detection 

If enabled by setting 

FL On

, floor temperature detection is performed 

using a sensor located in the floor. The 

FL Lo 

and

 FL Hi

 parameters 

allow you to set temperature thresholds for under-floor heating 
regulation: 

• 

If the current 

floor temperature is lower than

 

FL Lo

, the 

thermostat will switch the heating on. This way a comfortable floor-
temperature is maintained even if no switch-on request is 
generated due to the room temperature. 

• 

If the current 

floor temperature is higher than

 

FL Hi

, the 

thermostat will switch the heating off. This prevents the floor from 
being damaged by too high a temperature. 

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