Trane ReliaTel - Direct Spark Ignition Control (Texas Instruments, 3-10 Ton Units only); Table 33. Ignition Module Diagnostics

88 RT-SVD03G-EN
Direct Spark Ignition Control (Texas Instruments, 3-10
Ton Units only)
This microprocessor based, communicating solid state device provides gas valve control, proof of
ignition, ignition retries, 1 hour reset, operation of the inducer and diagnostics through an LED as
well as communication to the refrigeration module. Inputs to the control include a pressure switch,
rollout switch and limit switch as well as a flame proving circuit.
This device takes control of the ignition, timings related to the ignition cycle, and supervision of
the gas components.
The RTRM controls all functions via a MODBUS communication link.
The remote flame sensor is located on the top burner which ensures that all burners are lit. Field
measured flame sensor voltage can vary significantly due to the construction of typical voltmeters
used.
The control has a 20 second pre-purge cycle as well as a 60 second inter-purge between cycles
should a flame not be established on the first try.
The ignition module has a green LED for diagnostics:
Table 32. Ignition Module Specifications
Voltage range 18-32 VAC, 50/60Hz
Power consumption 350mA @ 24vac
Spark Voltage 25,000 volts max @ 10-13 mJ
Flame sense voltage Nominal 90Vrms
Flame sense signal
Nominal 4.5 micro amps, minimum 1.2
micro amps
Pre-purge 20 seconds
Post-purge 5 Seconds
Inter-purge 60 seconds
Flame establishment period 2 to 7 seconds
Flame failure response time 0.8 seconds
Loss of flame lockout 3 tries, locks out after 3rd try
Lockout reset Interrupt power for 3 seconds minimum
Auto reset 1 hour
Loss of communication lockout (with RTRM) 10 seconds
Table 33. Ignition Module Diagnostics
Steady light Module is powered up, but no active call for heat.
Blinking at continuous steady rate Active call for heat.
One blink Loss of communication.
Two blinks System lockout (failure to ignite, no spark, low/no gas pressure, etc.
Three blinks
Pressure switch (no vent air flow, bad CBM, closed at initial call for heat).
Auto reset. (Applicable to 3-10 tons units only.)
Four blinks
High limit (excessive heat in combustion chamber, low airflow). Auto
reset.
Five blinks
Flame sensed and gas valve not energized or flame sensed and no call
for heat.
Six blinks
Flame rollout (CBM failure, incorrect gas pressure, incorrect primary air).
Requires manual reset of the switch. (Applicable to 3-10 tons units only)
Seven blinks
W1& W2 swapped (electromechanical 3-10 tons units). ReliaTel module
will communicate a heat fail diagnostic back to the RTRM.