Carrier 59SC2C Series Installation, Start-up, Operating And Service And Maintenance Instructions

Also see for 59SC2B: Product data

66i. Remove jumper R to W.2. Verify natural gas input rate by clocking meter.NOTE: Contact your HVAC distributor or gas supplier for metricgas meter Tables, if required.a. Turn off all other gas appliances and pilots served by themeter.b. Jumper R to W.c. Run furnace for 3 minutes.d. Measure time (in sec) for gas meter to complete one revolu-tion and note reading. The 2 or 5 cubic feet dial providesa more accurate measurement of gas flow.e. Refer to Table 20 for cubic ft. of gas per hr.f. Multiply gas rate cu ft./hr by heating value (Btuh/cu ft.) toobtain input rate.g. If clocked rate does not match required input from Step 1,increase manifold pressure to increase input or decreasemanifold pressure to decrease input. Repeat steps b throughe of Step 1 until correct heat input is achieved. Re--installregulator seal cap on gas valve.3. Restore furnace to normal operating condition.a. Turn gas valve ON/OFF switch to OFF.b. Remove water column manometer or similar device frommanifold pressure tap.c. Replace manifold pressure tap plug to gas valve.d. Turn gas valve ON/OFF switch to ON.e. Check for gas leaks and verity furnace operation.FIRE HAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.Reinstall manifold pressure tap plug in gas valve to preventgas leak.! WARNINGAdjust Temperature RiseNOTE: Blower door must be installed when taking temperaturerise reading. Leaving blower door off will result in incorrecttemperature measurements, due to possible changes in duct staticpressure and airflow.FURNACE DAMAGE HAZARDFailure to follow this caution may result in:S Overheating the heat exchangers or condensing flue gasesin heat exchanger areas not designed for condensate.S Shortened furnace life.S Component damage.Temperature rise must be within limits specified on furnacerating plate. Recommended operation is at midpoint of riserange or slightly above.CAUTION!Jumper R to W to check gas--heat temperature rise. Do not exceedtemperature rise ranges specified on unit rating plate.This furnace must operate within the temperature rise rangesspecified on the furnace rating plate. Determine the air temperatureas follows:1. Place duct thermometers in return and supply ducts as closeto furnace as possible. Be sure thermometers do not “see”heat exchangers so that radiant heat does not affectthermometer readings. This is particularly important withstraight run ducts.2. When thermometer readings stabilize, subtract return--airtemperature from supply--air temperature to determinetemperature rise.If the temperature rise is outside this range, check the following:1. Gas input rate.2. Derate for altitude, if applicable.3. Return and supply ducts for excessive restrictions causingstatic pressures greater than 0.50--in. W.C. (125 Pa)4. Adjust temperature rise by adjusting blower speed.S Increase blower speed to reduce temperature rise.S Decrease blower speed to increase temperature rise.ELECTRICAL OPERATION HAZARDFailure to follow this warning could result in personal injuryor death.Disconnect 115vac electrical power before changing speed tap.! WARNING(Read following caution before changing taps).UNIT DAMAGE HAZARDTo avoid operating outside the rise range and avoidcomponent damage:Refer to the Air Delivery Tables to determine which airflowsand settings are allowed for proper heating airflow. DO NOTuse the highlighted settings for Heating airflow. Thehighlighted settings are to be used for Cooling andContinuous Fan ONLY.CAUTION!Change these settings as required to maintain proper temperaturerise for Heating and Cooling as described above. To change blowermotor speed selections for heating mode, remove blower motorlead from control HEAT terminal. See Fig. 38. Select desiredblower motor speed lead from one of the other motor leads andrelocate it/them to HEAT (heating blower tap) terminal(s).Reconnect original lead on SPARE terminal.Adjust Blower Off Delay (Heat Mode)If desired, the main blower off time delay period may belengthened or shortened when operating in the heating mode toprovide greater comfort. For position and location of jumpers oncontrol center, see Fig. 38 and Fig. 70.The blower off delay has four adjustable settings from 90 sec to180 sec. See Table 18. To change the blower off delay setting,move the jumper from one set of pins on the control to the pinsused for the desired blower off delay. Factory blower off delaysetting is 120 sec.Table 18 – Blower Off Delay Jumper PositionsPINS 1 AND 2 2 AND 3 3 AND 4 4 AND 5Time (in sec.) 90 120 150 18059SC2C