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START-UP PROCEDURES
PART 6. START-UP PROCEDURES
A. SEQUENCE OF OPERATION
1. When power is first applied to the control, the control display will read the outlet tempera-
ture. The control will initially run through a self-diagnostic routine and then go into its oper-
ating mode. If there is no call for heat, the System will go into an idle state. The circulator
must be wired to incoming power to operate continuously. If there is a code FL in the dis-
play window, then either the circulator is not operating or there is a restriction in the piping
system, rendering an inadequate flow.
2. The control then performs selected system diagnostic checks. If all checks are successfully
passed, a pre-purge cycle is initiated (the blower will be on maximum speed).
3. When the actual temperature is below a set-point, minus the switching differential, the burn-
er will operate and modulate to heat the system.
4. When the pre-purge period is complete, power is applied to the spark ignitor for approxi-
mately 6 seconds. Approximately 2 seconds later, we verify flame. If a flame is not verified
during the trial-for-ignition, the gas valve is immediately closed and the control will return to
step 2. After three trials, if a flame is not verified, the control will go into a lockout mode. If a
flame is confirmed, the control enters the heating mode. The fire rate will be based on the
proprietary algorithm.
5. When water temperature reaches the temperature set point, the gas valve is closed and the
control enters a post-purge state (the blower will be on maximum speed).
6. When the post-purge is complete, the control enters an idle state while continuing to moni-
tor temperature and the state of other system devices. If a call-for-heat is received, the con-
trol will automatically return to step 2 in sequence and repeat the entire operating cycle.
B. ITEMS TO BE CHECKED BEFORE LIGHTING THE MUNCHKIN
It is recommended that you read the General Information Section (Part 1) to get a better under-
standing how the Munchkin operates before you start the unit.
1. Make sure that you follow the Lighting instruction before running the Munchkin.
2. Check to see if all the electrical connections are on securely.
3. Make sure that the Gas is turned on inside the cabinet and outside of the Munchkin.
4. Double check the temperature setting (Note: The Munchkin is factory set at 119 degrees)
5. Make sure the unit is properly grounded and the electrical wiring meets the requirements of
the electrical section (Part 2).
6. Turn on the power to the Munchkin. The Temperature of the Munchkin Outlet will appear in
the display provided. If a fault code appears, correct the fault before operating. Make sure that
the flow switch is connected and adjust the setpoint for the desired water temperature. The
Munchkin will now run its pre-purge cycle, then begin running, which will be indicated by the
Green light illuminating under “Flame On” in your display.
WARNING
If you do not follow these instructions exactly, a fire or explosion may
result, causing property damage, personal injury or loss of life.