Viega Basic Heating Control, Installation Manual

15

VIEGA      1-800-976-9819 

PI-16015-03/09

tEst sEQUEnCE 

Each step in the test sequence lasts 
10 seconds.

During the test routine, the test 
sequence may be paused by 

pressing the 

test

 button. If the 

test

button is not pressed again for 5 

minutes while the test sequence is 

paused, the control exits the entire 

test routine. If the test sequence 

is paused, the 

test

 button can be 

pressed again to advance to the 

next step. This can also be used 

to rapidly advance through the test 
sequence. To reach the desired 

step, repeatedly press and release 

the 

test

 button until the appropriate 

device and segment in the display 
turn on.

5.7  testing the Control

The Basic Heating Control has a 

built-in test routine that is used to 

test the main control functions. The 
Basic Heating Control continually 
monitors the sensors and displays 
an error message whenever a fault 

is found. See the following pages for 

a list of the Basic Heating Control’s 

error messages and possible causes. 
When the 

test

 button is pressed, the 

test light is turned on. The individual 
outputs and relays are tested in the 
following test sequence.

testing sensors

A good quality test meter capable 

of measuring up to 5,000k

Ω 

(1k

Ω 

= 1000

Ω

) is required to 

measure the sensor resistance.  

In addition to this, the actual 
temperature must be measured with 

a good quality digital thermometer.

If a thermometer is not available, 
a second sensor can be placed 
alongside the one to be tested and 

the readings compared.

First measure the temperature using 
the thermometer and then measure 
the resistance of the sensor at the 
control. The wires from the sensor 

must not be connected to the 

control while the test is performed.  

Using the chart below, estimate 
the temperature measured by the 

sensor. The sensor and thermometer 

readings should be close. If the test 
meter reads a very high resistance, 
there may be a broken wire, a poor 
wiring connection, or a defective 
sensor. If the resistance is very low, 
the wiring may be shorted, there 

may be moisture in the sensor, 

or the sensor may be defective. 

To test for a defective sensor, 

measure the resistance directly  
at the sensor location.

Do not apply voltage to a sensor at 
any time as damage to the sensor 
may result.  

InstALLAtIon - CHAPtER 5

Step 1 - The mixing valve is run 

  fully open. 

Step 2 - The mixing valve is run fully  

  closed, and then the system    

  pump (Sys Pmp) is turned on. 

Step 3 - The Boiler contact is turned on

  for 10 seconds.  After 10

  seconds, the Boiler and Sys Pmp  

  contacts are shut off.                                                    

Step 4 - After the test sequence is  

  completed, the control resumes  

  its normal operation.