Carrier 59SC5B Installation, Start-up, Operating And Service And Maintenance Instructions

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733. Record amp draw across terminals when furnace is in lowheat and after blower starts.4. Set heat anticipator on thermostat per thermostat instruc-tions and install on subbase or wall.5. Install blower access door.R Y W G10 TURNSTHERMOSTAT SUBBASETERMINALS WITHTHERMOSTAT REMOVED(ANITICIPATOR, CLOCK, ETC.,MUST BE OUT OF CIRCUIT.)HOOK-AROUNDAMMETEREXAMPLE: 5.0 AMPS ON AMMETER10 TURNS AROUND JAWS = 0.5 AMPS FOR THERMOSTATANTICIPATOR SETTINGFROM UNIT 24-VCONTROL TERMINALSA96316Fig. 62 -- Amp. Draw Check with AmmeterElectronic thermostat: Set cycle rate for 3 cycles per hr.Check Safety ControlsThe flame sensor, gas valve, and pressure switch were all checkedin the Start--up procedure section as part of normal operation.1. Check Main Limit SwitchThis control shuts off combustion system and energizes air--circulating blower motor, if furnace overheats. By using thismethod to check the temperature limit control, it can be es-tablished that the limit is functioning properly and that thelimit will operate if there is a restricted return--air supply ormotor failure. If the limit control does not function duringthis test, the cause must be determined and corrected.a. Run furnace for at least 5 minutes.b. Gradually block off return air with a piece of cardboard orsheet metal until the limit trips.c. Unblock return air to permit normal circulation.d. Burners will re--light when furnace cools down.2. Check Pressure Switch(es)This control proves operation of the draft inducer blower.a. Turn off 115--v power to furnace.b. Disconnect inducer motor lead wires from wire harness.c. Turn on 115--v power to furnace.d. Set thermostat to “call for heat” and wait 1 minute. Whenlow pressure switch is functioning properly, hot surfaceigniter should NOT glow and control diagnostic lightflashes a status code 31. If hot surface igniter glows wheninducer motor is disconnected, shut down furnace immedi-ately.e. Determine reason low pressure switch did not functionproperly and correct condition.f. Turn off 115--v power to furnace.g. Reconnect inducer motor wires, replace door, and turn on115--v power.h. Blower will run for 90 sec before beginning the call forheat again.i. Furnace should ignite normally.Checklist1. Put away tools and instruments. Clean up debris.2. Verify that the jumper is removed from the TEST/TWINterminal. Verify that there is nothing plugged into the PLTconnector. (Note: If there is a jumper connector pluggedinto PLT, remove it and discard.) See Fig. 37.3. Verify that the Blower/Heat Off Delay jumpers are set asdesired. See Fig. 37 and 70.4. Verify that there are no unsealed openings in the blowershelf or casing.5. Verify that the blower (lower door in upflow position) andcontrol (“Main” or upper door in upflow position) doors areproperly installed.6. Verify that the Status LED glows. If not, check that thepower supply is energized and that the blower door issecure. See Fig. 63 to interpret diagnostic codes.7. Cycle test furnace with room thermostat to be sure that itoperates properly with the room thermostat. Check allmodes including Heat, Cool and Fan.8. Check operation of accessories per manufacturer’sinstructions.9. Review Owner’s Manual with owner.10. Attach entire literature packet to furnace.Table 21 – Altitude Derate Multiplier for U.S.A.ALTITUDE PERCENTOFDERATEDERATEMULTIPLIERFACTOR*FT. M0–2000 0--- 610 0 1.002001–3000 610--- 914 4--- 6 0.953001–4000 914--- 1219 6--- 8 0.934001–5000 1219--- 1524 8--- 10 0.915001–6000 1524--- 1829 10--- 12 0.896001–7000 1829--- 2134 12--- 14 0.877001–8000 2134--- 2438 14--- 16 0.858001–9000 2438--- 2743 16--- 18 0.839001–10,000 2743--- 3048 18--- 20 0.81*Derate multiplier factors are based on midpoint altitude for altitude range.