Product Overview

44
103859-12 - 8/19
MPO-IQ
Installation & Service Manual
Figure 32: Cad Cell Location
• If safety switch shuts down burner and
resistance is above 1600 OHMS, open line
switch to boiler. Access cad cell under
ignitor, clean face of cad cell and see
that cell is securely in socket, see Figure
32. Check gasket around perimeter of
ignitor lid for proper seal. If gasket is
missing or damaged, replace gasket. Room
light can effect cad cell resistance. Reset
safety switch.
• Close line switch to boiler. If burner starts
and runs beyond safety switch cut-off
time, cell is good. If not, install new cell.
• Close hand valve in oil supply line.
• Failure occurs, device enters Recycle Mode.
• Device tries to restart system after
approximately 60 seconds.
• After third Recycle Mode trial, safety
switch locks out within safety switch timing
indicated on label and control enters
Restricted Mode. Ignition and motor stop
and oil valves closes.
d. Power Failure Check: After Flame is
established, turn the power off to the control/
burner. The burner should shut down safely.
When power is restored a normal ignition
sequence should be started.
K. CHECK HIGH LIMIT
1. Adjust system thermostat(s) to highest setting.
2. Allow burner to run until boiler water temperature
exceeds high limit setting. The burner should
shut down and circulators continue running.
3. Allow the temperature to drop below control
setting. The burner must restart.
4. Boiler installation is not considered complete until
this check has been made.
L. IF CONTROLS MEET REQUIREMENT outlined in
Paragraphs I thru k.
1. Allow boiler to operate for approximately 30
minute, confirm the boiler and system have no
leaks.
2. Reset thermostat(s) at desired setting.
M. IF CONTROLS DO NOT MEET
REQUIREMENTS outlined in Paragraphs I thru k,
replace control and repeat checkout procedures.
8 System Start-Up (continued)
WARNING
Cad Cell Jumper must be removed after this
check.
!