Carrier 58MVP Installation, Start-up, And Operating Instructions Manual

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Carrier 58MVP Installation, Start-up, And Operating Instructions Manual Manual pdf 36 page image

1. While blower is operating in either low heat or continuous fan,the coast down calibration is performed once a minute toupdate blower RPM for zone damper position changes duringa given cycle unless the blower pulse width to blower motoris greater than 60 percent. This prevents nuisance faults fromoccurring when a high continuous fan CFM has been selected.2. While blower is operating in either high heat or cooling,blower pulse width to blower motor is frozen when blowerRPM is within 10 percent of calculated blower RPM for 5 sec.START-UP PROCEDURESStep 1—General1. Furnace must have a 115-v power supply properly connectedand grounded.NOTE: Proper polarity must be maintained for 115-v wiring. Ifpolarity is incorrect, control center fault indicator light flashesrapidly and furnace does not operate.2. Thermostat wire connections at terminals R, W/W1, G, andY/Y2 must be made at 24-v terminal block on control center.3. Natural gas service pressure must not exceed 0.5 psig (14-in.wc), but must be no less than 0.16 psig (4.5-in. wc).4. Blower access panel must be in place to complete 24-velectrical circuit to furnace.These furnaces are equipped with a manual reset limit switchin burner box. This switch opens if an overheat condition(rollout) occurs in burner enclosure. Correct inadequatecombustion-air supply or improper venting condition andreset switch. DO NOT jumper this switch.Before operating furnace, check each manual reset switch forcontinuity. If necessary, press button to reset switch.Step 2—Select Setup Switch PositionsAIR CONDITIONING (A/C) SETUP SWITCHESThe air conditioning setup switches are used to match furnaceairflow to cooling unit used. This furnace will provide 400 CFMper selected air conditioning tonnage.To set the desired cooling airflow:1. Remove main furnace door and blower access panel.2. Locate A/C setup switches on control center. (See Fig. 25.)3. Determine air conditioning tonnage used.4. Use Table 8 or wiring schematic to determine proper setupposition of A/C switches. (See Fig. 24 and 45.)NOTE: Excessive airflow caused by improper A/C switch setupmay cause condensate blow off in cooling mode.5. Replace main furnace door and blower access panel.Table 8—Air Conditioning (A/C) Airflow Setup Switch PositionAIRCONDITIONER(TONS)CFM AIRFLOWA/C SETUPSWITCH POSITION ALLOWABLE FURNACE MODEL SETUPA/C-1 A/C-2 A/C-3 040-14 060-14 080-14 080-20 100-20 120-20Default 1200 or2000 OFF OFF OFF 3 Tons1200 CFM3 Tons1200 CFM3 Tons1200 CFM5 Tons2000 CFM5 Tons2000 CFM5 Tons2000 CFM1-1/2 600 ON OFF OFF X X X — — —2 800 OFF ON OFF X X X X X X2-1/2 1000 ON ON OFF X X X X X X3 1200 OFF OFF ON X X X X X X3-1/2 1400 ON OFF ON X X X X X X4 1600 OFF ON ON — — — X X X5 2000 ON ON ON — — — X X XX—Indicates allowable selection.Table 9—Continuous Fan (CF) Airflow Setup Switch PositionCONTINUOUSFAN (CFM)CF SETUPSWITCH POSITION ALLOWABLE FURNACE MODEL SETUPCF-1 CF-2 CF-3 040-14 060-14 080-14 080-20 100-20 120-20Default OFF OFF OFF 565* 515* 690* 690* 860* 1035*600 ON OFF OFF X X X — — —800 OFF ON OFF X X X X X X1000 ON ON OFF X X X X X X1200 OFF OFF ON X X X X X X1400 ON OFF ON X X X X X X1600 OFF ON ON — — — X X X2000 ON ON ON — — — X X X* Add 15% additional CFM when Bypass Humidifier switch SW-3 on control board is used.X—Indicates allowable selection.→ Fig. 48—Example of Setup Switch in OFFPositionA951981OFF36