Patterson-Kelley MOD-04 Manual De Usuario

 24 

General Lock out / Tag out procedure must be em-
ployed when servicing unit.   

Hazard analysis should be performed by end user to 
insure safety of their employees and/or service tech-
nicians. 

In addition to the requirements of Section 2.1, main-
tenance performed on the Siemens gas valve re-
quires that the valve be removed from the boiler and 
securely placed in a vice prior to performing any 
maintenance. 

 

 

WARNING!  

Label all wires prior to disconnection when servicing 
controls.  Wiring errors can cause improper and 
dangerous operation. 

 

 
Verify proper operation after servicing. 

 

Observe operating temperature and general condi-
tions.  Make sure that the flow of combustion and 
ventilating air to the boiler is not obstructed.  De-
termine the cause of any illuminated red indicators, 
unusual noises or operating conditions and make the 
necessary corrections. 
 

WARNING!  

Check daily to be sure that the boiler area is free 
and clear of any combustible materials, including 
flammable vapors and liquids. 

 
The motorized gas valves contain hydraulic oil 
which may be hazardous to the environment.  
Should a leak develop, use safe procedures for dis-
posal of this or any other lubricant. 

 

Observe the conditions of the pilot and main flame.  
A normal High fire flame is blue.  If the flame is 
yellow, then corrective action must be taken.  In 
Low fire the burner will glow a yellowish orange. 

Correct air adjustment is essential to the efficient 
operation of this boiler.  If an adjustment in the 
combustion is necessary, the flue gas composition 
should be checked with a carbon dioxide (CO

2

) or 

oxygen (O

2

) analyzer to set conditions.  Refer to 

Section 3.12.2 and 3.12.3. 

 

1.  Test flame detection by voltage reading at the 

control programmer. 

2.  Test high-limit control by reducing setting be-

low the operating temperature.  Burner should 
shut off.  After readjusting the thermostat, press 
the button to reset the switch. 

3.  Test operating temperature controls by reducing 

or increasing temperature setting as necessary to 
check burner operation. 

4.  Check flue gas temperature at outlet.  If there is 

a temperature increase over previous readings, 
this probably indicates sooting or water scale 
build-up. 

5.  Test the water cutoff by trying to restart boiler 

with the system pump off.  The boiler should 
not operate.  Water flow indicator should light.  

6.  Test low gas pressure switch by closing main 

gas cock and attempting to restart boiler. 

This work should be performed by factory-trained 
personnel. 

 

In addition to the recommended monthly service: 

1.  Inspect and clean blower fan and inlet screen of 

any accumulated dust or lint. 

2.  Clean burner of any accumulated dust or lint.  

See Section 5.2 on "Cleaning the Burner."