90 RT-SVD03G-EN
ReliaTel Hot Surface Ignition Control (12.5 - 50 Ton 1
Stage, 2 Stage, and Modulating Gas Heat)
This microprocessor based, communicating solid state device provides gas valve control, proof of
ignition, ignition retries, one hour reset, operation of the inducer and diagnostics through an LED,
as well as communication to the RTRM via a MODBUS communication link. Inputs to the control
include high limits and flame sensor operation. A combustion fan proving switch is used with
modulating gas heat units but is not used with 1 or 2 stage burners. This device takes control of
the ignition, timings related to the ignition cycle and supervision of the gas components.
Ignition Control Module Diagnostics
There is a green LED located on the ignition module. The table below lists the diagnostics and the
status of the LED during the various operating states.
Any time the Ignition module is powered, the LED will be lit to provide status of the ignition system.
At initial power-up, the LED will flash for one second.
The pause between groups of flashes is approximately two seconds.
Modbus voltage (measure between RTRM J5-3 and J5-4):
• With J5 plug connected, will read approximately 9.6 to 10.7 vdc (Flashing)
• With J5 unplugged, will read approximately 10.5 to 11.2 vdc (Flashing).
Table 34. Ignition Module Specifications
Voltage range 18-32 vac, 50/60 Hz
Ignitor voltage 115vac, 50/60 Hz
Flame sense current 4.5 microamps (nominal), 1 microamp minimum
Pre-purge 45 sec
Flame establishment period 2 sec min, 7 sec max
Flame failure response time 0.8 sec or less
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 sec
Table 35. Ignition Module Diagnostics
Steady OFF No power/ Internal failure
Steady ON Normal power-up, with no heat call.
Slow flash rate Normal call for heat, ¾ second on, ¼ second off.
Fast flash rate Used for error indication only
Error Code Flashes-
One flash Communication loss between RTRM and IGN
Two flashes System lockout; failed to detect or sustain flame
Three flashes Not used
Four flashes High limit switch open
Five flashes
Flame sensed and gas valve not energized; or flame sensed and no
call for heat
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