Ingersoll-Rand ReliaTel, Manual, Page: 119 / 176

RT-SVD03L-EN 119
Direct Spark Ignition Control
Texas Instruments, 3 to 10 Tons
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.
Table 86. Ignition module specifications
Voltage range 18-32 VAC, 50/60Hz
Power consumption
350mA @ 24 VAC
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
The ignition module has a green LED for diagnostics:
Table 87. 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 to 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 to 10 tons units only)
Seven blinks
W1& W2 swapped (electromechanical 3 to 10 tons units). ReliaTel ™ module will communicate a
heat fail diagnostic back to the RTRM.