Sequence Of Operation.17 - Space-Ray LTS Series Assembly, Installation And Operation Instructions

> STEP 3: CHECK SPARK IGNITION CIRCUIT.
AWARNING:
THE IGNITION CIRCUIT GENERATES A 20,000 VOLT OPEN CIRCUIT AND ELECTRICAL SHOCK CAN RESULT.
a) Check ignition cable.
b) Check external fuse on the module.
c) Verify power (24V) at module input terminals and output terminal to gas valve.
d) Replace spark module if fuse and power are OK.
> STEP 4: CHECK FLAME SENSOR CIRCUIT.
a) Turn off heater at thermostat.
b) Connect a meter (dc microammeter scale) in series with the ground lead as shown in the diagram. Use a Honeywell
W136 Test Meter or equivalent. Connect the meter as follows;
• Disconnect the ground lead at the electronic control.
• Connect the black (negative) meter lead to the electronic control GND terminal.
• Connect the red (positive) meter lead to the free end of the ground lead.
c) Restart the system and read the meter. The flame sensor current must be steady and measure at least 1.5 micro amps.
d) If the meter reads less than the minimum or if reading is unsteady:
• Make sure burner flame is capable of providing a good rectification signal.
• Make sure fasteners securing Igniter/sensor are tightened to assure
correct positions. DO NOT relocate Igniter/sensor.
• Check for excessive (over 1000°F) temperature at ceramic insulator on
flame sensor. Excessive temperature can cause short to ground. DO NOT
relocate igniter/sensor.
• Check for cracked ceramic insulator, which can cause short to ground, and
replace sensor if necessary.
• Make sure that electrical connections are clean and tight. Replace
damaged wire
e) Remove microammeter and reconnect ground wire. Return system to normal
operation.
tarn
Multipurpose
Meter
f-a
VALW
VALVE
GND
0
_
/Or
o
'CJ
>
Modulo Black (-)
FLAME SENSOR CURRENT CHECK
- USE uA SCALE -
28) SEQUENCE OF OPERATION
INSUFFICIENT AIRFLOW -
SYSTEM SHUTS OFF
(RED light OFF)®
IF NO SPARK,
SYSTEM GOES INTO LOCKOU
(AMBER light OFF)®
J
THERMOSTAT (or Controller) CALLS FOR HEAT
1 (GREEN light ON)
r
DRAR INDUCER STARTS
(Purge Period)
DIAPHRAGM AIR SWITCH ON
(RED light ON)
T
SPARK ON
(AMBER light ON)
I
-4
i
FAILURE TO IGNITE-
SYSTEM GOES INTO LOCKOUT
(AMBER light OFF) ®
VALVE OPENS
(AMBER light ON)
IF POWER INTERRUPTED,
SYSTEM SHUTS OFF UNTIL
POWER IS RESTORED
(ALL lights OFF)
BURNER IGNITES-
SPARK CUTS OFF
I
IF FLAME-OUT OCCURS, SPARK
RETURNS FOR RE-IGNITION®
THERMOSTAT (or Controller)
SATISFIED, BURNER OFF
(ALL lights OFF)
draft
- Octagons represent actions resulting from possible malfunction.
NOTES:
® - Insufficient airflow Indicates defective
inducer or restricted flue.
® - Corrective action and system reset are necessary.
® - If burner does not re-ignite, system goes into
lockout. Corrective action and system reset are
necessary.
Form #43155010
Fob434
-17-