Diagnostics - Re-Verber-Ray MP3 Series Insert Manual

MP3 Series
If the burner fails to light or flame is not detected within eight (8) seconds, the gas valve circuit is de-energized
and the control performs an inter-purge delay before attempting another ignition sequence. The control will
attempt two (2) additional ignition trials before entering the soft lockout sequence, which turns off the gas
valve immediately, though the blower will continue to operate. After one (1) hour, if the thermostat is still
calling for heat, the TP-351A will automatically reset and attempt a new trial for ignition. After multiple
attempts to ignite the burner have failed, the TP-351A enters a hard lockout mode, and the control will not
open the gas valve without manual intervention via resetting the thermostat or removing the 120 VAC for a
period of 5 seconds. The blower will continue to operate while the heater is in hard lockout.

Diagnostics

Lockout:
The controls will automatically lockout the heater system when an external or system fault occurs. There are
two types of lockout:
Soft Lockout: The heater will attempt to light three times. In the event of a failed ignition (gas pressure,
valve, no flame sense, etc.), the heater will enter Soft Lockout mode for 15 minutes, then
attempt to light three more times before entering Hard Lockout mode. The blower will
continue to operate.
Hard Lockout: If proof of flame is not established, a component failure occurs, or blockages are evident,
the heater will enter Hard Lockout mode. If lockout occurs, the control can be reset by
briefly interrupting the power source. The control will not open the gas valve unless there is
an interruption by the user, though the blower will continue to operate.
Figure 3.1 • Operational Indicator Lights
Amber Light (24 V)
Indicates Gas Valve
Operation
HOT
120V
NEUTRAL
EARTH
- 120V HEATER INPUT -
Amber Light (120 V)
Indicates Pressure
Switch Actuation
13
3.0 Operation • Sequence of Operation • Diagnostics