IBC Technologies SL 20-115 Installation And Operating Instructions Manual
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INSTALLATION AND OPERATION INSTRUCTIONS5-4SL 20-115 MODULATING GAS bOILERNext, confirm that the circuit is properly powered. The supply voltage to the sensorshould be 13.8 VdC; to check, the simplest technique is to measure the circuit onthe face of the controller circuit board (vs. an attempt to splice into the harness /connectors). See previous page for a presentation of the measurement points.Finally, to measure the sensor output, connect a dC volt meter between points“J501-33” (located on the footprint of the 34 pin connector – immediately belowthe right leg of the lCd display - second pin from bottom right) and gnd (seeabove). With the fan off, the measure should read 0.5VdC. With a Fan Pressureof approx. 300, the meter will read 1.5v (approx.). note:- this component is asensor, not a switch; do not over-pressurize by blowing into the air referencelines. Maximum pressure capacity is 40” w.c. @ 20 C but only 10” w.c. @ 5C.5.2.4 Water Pressure Sensorgo to the Advanced Diagnostics screen, and check the top display line — inletPressure. With the pumps at rest and system pressure of 12.5 psi, the InletPressure sensor value should read 235 +/- 5.Check operation of the sensor by isolating the boiler from its system piping,closing the system fill valve then cracking the pressure relief valve; the signalshould reflect declining pressure. If it remains “fixed”, drain boiler and replacesensor, or dislodge any blocking debris from sensor inlet channel and reinsert.5.2.5 Hi-Limit Switches (water and UvHL)Check resistance between leads. if resistance is very low, temperature shouldbe acceptable. if resistance is very high, temperature should be out of bounds.a simple means of checking whether a high limit switch is open is by measuringthe aC voltage across the device. if the reading is 24 VaC the switch is open. if a0VaC reading is shown, it is closed. neVer connect an ohm-meter or continuitychecker across a live circuit.5.2.6 Ignition Modulethere are two approved ignition modules - Fenwal (grey) and Capable Controls(white). each have a red led lamp providing the following signals: Fenwal – 1rapid flash on 1st entering Pre-purge, 3 rapid flashes upon Failure to Ignite After 3Attempts; the Capable Controls module provides a single flash at the start of eachPurge and Interpurge cycle, continuous rapid flashes during the 4 second sparkinterval, solid illumination following successful ignition until burner shutdown, anda slow on/off with a 3-try failure.Flame current can be monitored on the Fenwal. Connect an electrical test meter- set to read Microamps (symbol μA) to the two test pins at the top right of theignition module. recycle the boiler so it entersanother trial for ignition and monitor the flamecurrent reading. When the burner ignites, asteady reading of 2-7 Microamps should bemeasured by your meter. the control will lockout if the reading drops below 0.7 Microamps.(see Section 5.3.1 - “Control Module - Maximumignition trials error”, and Section 5.3.2 - “Ignitionproblems”). For conversion from Fenwal to theCapable Control, specify IBC part# 240-049 –that provides the module plus added wire leadand instructions. Flame current measurement isnot possible on Capable Controls module.Do not blow into sensor portsAir pressure sensorWater pressure sensorUpper Vessel High Limit (UVHL)Water temperature high limit switchFenwal ignition module -Microamp (μA) test points areshown at top left corner ofmodule (beside red L.E.D.) |
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