Velocity Shadow Series, Installation And Operating Instructions Manual

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E. Diagnostic Mode
Enter Diagnostic Mode by pressing and holding both the LH and RH buttons for at least 3s. The RH (“Next”) button navigates
between screens. The LH (“Done”) button returns to User Mode. All Diagnostic Mode screens are shown in Figure 12.7. A
description of each is below. For more information on troubleshooting, see Section XIV.
uA – Flame signal in micro-Amps . This is shown as “---“ when the burner is off.
Alert – Not used (screen will always read zero).
Lockout – Shows the code for the most recent lockout that occurred . If none have occurred since this control was powered up, this
screen will read zero. A list of lockout codes is shown in Section XIV.

T – Shows the current difference between the supply and return temperatures.
LF – Forces the burner to run at low fire if it is on (used for combustion testing). Pressing the LH (“Done”) button returns the user
to User mode and also returns the burner to automatic modulation. If no button on pressed while on this screen for 15 minutes,
control panel will automatically return to User Mode and burner will return to automatic operation.
HF - Forces the burner to run at high fire if it is on (used for combustion testing). As with the HF screen, pressing the LH
(“Done”) button or staying on this screen for 15 minutes without touching a button returns the user to User Mode and also restores
automatic modulation.
From User Mode
Flame
Signal
Alert Code
(Not Used)
Code for
Last Lockout
Current Boiler
Water Δ T
Low Fire
Hold
High Fire
Hold
Diagnostic Mode Button Usage:
LH (Done) – Return to User Mode
RH (Next) – Move to next screen
Automatic modulation restored when not
on HF or LF screen
For a list of Hold and Lockout Codes, see Section XIV
FIGURE 12.7: DIAGNOSTIC MODE SCREENS