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User manual Blueair, model 31MP

Manafacture: Blueair
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Refer to Step 7. d. If indicator light does not light, go to Step 5. STEP 5 - PUSH TEST BUTTON a. Energize power supply as in Step 1, a and b. b. Push button. Snapping sound indicates proper high-voltage output from power supply and surge resistor. Failure is probably in cells or top guide assembly or in the light circuit within the power door. Check cells, light and light circuit. If light is faulty, replace switch and light assembly. c. If there is no arcing or snapping, go to Step 6. STEP 6 - CHECK LINE VOLTAGE a. Remove access door and energize blower. Line voltage to the air cleaner can be determined using a neon test lamp and inserting prongs into receptacle on cabinet. If voltage checks low on the voltmeter, trace wiring back to determine cause of problem. (Refer to wiring application diagram.) b. If voltage checks correctly, open power supply door by removing the 6 screws from the door base. Use ohmmeter to check continuity of low-voltage wiring, taking care to check switch in both the “Open” and “Closed” position. If circuitry checks correctly, go to Step 7. STEP 7 - DISCONNECT SURGE RESISTOR. ENERGIZE POWER SUPPLY a. Refer to internal components of the power door, Fig. 13. b. De-energize system blower. Remove lug at output end of power supply and remove surge resistor from high-voltage circuit. BLK WIRE CONN WHT -> 115V 60HZ ./ FIELD WIRING GRN r -<£)----FIELD WIRED GROUND WHT BLK INTERLOCK (DO NOT BYPASS) 0^0- PWR SW RED VIO POWER SUPPLY PRI HV—vw DC > —o' PUSH TEST ASSY UNIT Fig. 17 — Internal Schematic for 31MP and 31 MM Electronic Air Cleaners c. Using jumper cord and grounding cord, provide circuitry between plug on power door and receptacle on cabinet. Attach grounding wire between power door base and cabinet. See Fig. 18. d. Energize system blower and turn switch to “On” position. Glowing light indicates faulty surge resistor; replace same. If light still is not glowing, go to Step 8. STEP 8 - CHECK OUTPUT OF POWER SUPPLY a. With blower and electronic cleaner on, measure output of power supply using voltmeter with mating high-voltage probe. If output reads between 6500 to 7500 volts DC, problem is defective light circuit. Go to Step 9. If output is low, replace power supply. STEP 9 - DEFECTIVE LIGHT CIRCUIT а. With power on, measure voltage at light circuit terminals on power supply. Output should read between 90 — 2000 volts. If output is correct, replace switch and light assembly. If there is no output, replace power supply. Component Checks CHECK ELECTRONIC CELLS Visual Inspection — Carefully examine the electronic cells. Look especially for: 1. heavy dirt accumulation 2. bent collector plates (plate cleaner) 3. broken ionizing wires 4. dirt accumulation on insulators 5. contact springs — broken or dirty — ionizer and collector damage б. deformed pleat grids (media cleaner) 10 Check for Short Circuits — Use an ohmmeter to check resistance between the outside frame of the cell and the high-voltage contact. In each case, the resistance should be infinite (open circuit). CHECK TOP GUIDE - (2000 Cfm Models) 1. Remove top guide assembly from cabinet by removing the single screw below junction box. See Fig. 5. 2. Using ohmmeter, check for shorts between contact spring and ground. Resistance should be infinite. 3. Examine insulators for cracks or heavy dirt buildup. Clean if dirty; replace if cracked. CHECK SURGE RESISTOR - See Step 7 under Diagnostic Tests. The function of the surge resistor is to protect the power supply from instantaneous “spikes” of high-voltage power that occur when the unit arcs. This important component must be operating satisfactorily to adequately protect the power supply. Do not bypass. CHECK LIGHT AND LIGHT CIRCUIT - See Step 9 under Diagnostic Tests. 1 — Ground Wire 2 — Patch Cord for 115-v Supply Voltage 3 — High Voltage Wire (7500-v DC) 4 — Voltmeter with 25-Kv DC Probe 5 — High Voltage Lead from Meter 6 — Common or Ground Lead from Meter Fig. 18 — Test Circuit Between Power Door and Cabinet 11 For replacement items use Carrier Specified Parts. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Tab 1 Form 31 MP-2SI Supersedes 31MP-1 SI Printed in U.S A 4-75 Codes F and MS Catalog No 5...