Crestron electronic 1.5 Benutzerhandbuch

        

Installation & Operation Manual

4.  Navigate to the Service Screen from the Home Screen by 

pressing the MAIN MENU button and then the SERVICE 
button.       

5.  On the Service Screen place heater into Service Mode by 

selecting the START button, then selecting Set Gas Valve 
1 - High.  

6.  Insert the probe from a combustion analyzer into the hole 

left by the removal of the flue temperature sensor.  

7.  Once the heat exchanger has modulated up to rate, 

measure the combustion.  The values should be in 
the range listed in Table 9A below.  CO levels should 
be less than 200 ppm for a properly installed unit. 

 

If the combustion is not within range reference the 
Troubleshooting Section in the Crest Service Manual for 
possible causes and corrective actions.   

The system pump output can be programmed to never 
run (OFF), run only when a space heating demand is 
present (ON), or run continuously except during warm 
weather shutdown (WWSD).  If the boiler is not heating 
an indirect HW (Hot Water) tank, it also turns on the 
boiler pump.  After the space heating call for heat ends,  
and the system pump is programmed as ON, the system 
pump continues to run for a short period of time.  If the 
boiler pump was running, it continues to run for a short 
period of time as well.  These pump delays are factory 
set to 30 seconds.  If different delays are desired, the 
appropriate parameters in the control must be changed.  
See the Crest Service Manual for a detailed explanation 
of this procedure. 

During normal operation, space heating set point 
temperatures can be adjusted from the Set Points Menu.  
Press the following buttons to navigate to the Set Points 
Menu from the Home Screen:

After pressing SETUP, the Password Screen will appear.  
Entering the correct password will allow access to all 
Installer Level adjustable parameters.  Press ENTER 
without a password to access the User Level parameters.

1.  To change a set point, use the arrows to highlight a 
 

user set point parameter and press the SELECT 

 button. 

 

2.  The description of the selected parameter and its 
 

current setting will appear at the bottom of the 

 screen. 

 

3.  To adjust the set point, press the following 
 

buttons to change the value being displayed:  

 

     or

4.  Once the set point has been adjusted to the desired 
 

setting press the SAVE button to change the set 

 point.

5.  Once all the necessary adjustments have been made, 
 

press the HOME button to return to the Home 

 Screen. 

 

Note:  The SAVE button must be pressed to ensure proper 
programming of the controls.  Failure to press the SAVE 
button will require all changes to be reprogrammed.

8. After 

Gas Valve 1 is set, repeat the same procedure for the 

second gas train by selecting Set Gas Valve 2 - High on 
the Service Screen.

9.   Once the heater analysis is complete, test the safety 

shutoff device by turning the manual shutoff valve to the 
OFF position and ensuring that the heater shuts down 
and registers an alarm.  Open the manual shutoff valve 
and reset the control. 

10. Turn the main power off to the boiler and replace the 

 flue temperature sensor into the flue pipe connection.

11.  Place the boiler back into normal operation.

You must replace the flue gas temperature 
sensor to prevent flue gas spillage into 
the room.  Failure to comply could 
result in severe personal injury, death, or 
substantial property damage.

 WARNING

1 - High 3.5% - 5.5% 11.2% - 14.8% 5.1% - 6.8% 10.5% - 13.2%

2 - High 7.8% - 8.6% 5.6% - 7.1% 9.4% - 11.0% 4.1% - 6.6%

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