Burnham ALP150 User Manual

Page 82

III. Component Test Procedures

Flame Signal Check

1. The flame signal can be checked between terminal

number 7 on the low voltage terminal strip and

ground. A good signal reading should be 6 VDC or
greater.

Hotwater - Indirect water heater thermostat (“1” =
Calling, “0” = Not Calling)

Pump - Heating circulator (“1” = On, “0” = Off)

Air-switch - Status of air pressure switch (“1” =
Closed, “0” = Open)

Gaspressure - This is actually the status of the high
limit (“1” = Closed, “0” = Open)

GasValve - Status of gas valve (“1” = Open , “0” =
Closed)

Flame - Shows whether the MCBA detects the

presence of the burner flame (“1” = Flame, “0” = No
Flame)

DHW Pump - Indirect water heater circulator (“1” =
On, “0” = Off)

3. RPM:

Fan - Actual speed of fan

Set - Target speed of fan.

Reading the MCBA Error Log

1. The MCBA keeps a log of the last six error codes.

To view these error codes select “Read from
MCBA” from the Error Menu.

2. This data can be saved as a file to disk by selecting

“Save to file” from the Error Menu or printed by
selecting “Print” from the same menu.

3. Error codes can also be removed from the memory

of the MCBA by selecting “Clear in MCBA” from
the Error Menu.

2. If the signal is lower then 6 VDC, check the

continuity of the ground wire between the ignitor
and the junction box. If the ground wire is suspect
replace the ground wire.

3. If the ground wire is in good condition, remove

the ignitor and flame sensor to inspect the ceramic
insulator for cracks. If none are found, sand off
any oxide deposits which formed on the electrodes.
If the insulator is cracked or the electrode cannot

be properly cleaned, replace the ignitor and flame

sensor. When replacing the ignitor and flame sensor,

be sure to replace the ignitor and flame sensor
gasket as well.

4. Other problems that can cause a low flame signal

include:
• An improperly adjusted throttle (confirm that the

is within the limits shown in the installation

manual).

• Fouling of the burner (remove the burner and

clean with compressed air).

• Low inlet gas pressure (verify that gas pressure

is within the limits shown on the rating plate).

• Grounded 24 VAC or sensor wiring (this problem

will result in no flame voltage reading, but will
normally not result in an E02 error because there

is still adequate flame current).

NTC Temperature Sensors

1. The supply, return, flue, and outdoor reset sensors

used on the Alpine are of the resistance type.

2. The Table 27 shows the range of resistance values

for these sensors at various temperatures.

This manual is related to the following products:

ALP105