Carrier WeatherMaker 8000 Installation, Start-up, And Operating Instructions Manual

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Carrier WeatherMaker 8000 Installation, Start-up, And Operating Instructions Manual Manual pdf 10 page image

The cabinet MUST have an uninterrupted or unbroken groundaccording to NEC ANSI/NFPA 70-1996 and Canadian Elec-trical Code CSA C22.1 or local codes to minimize personalinjury if an electrical fault should occur. This may consist ofelectrical wire or conduit approved for electrical ground wheninstalled in accordance with existing electrical codes. Do notuse gas piping as an electrical ground. Failure to follow thiswarning could result in electrical shock, fire, or death.24-V WIRING — Make field 24-v connections at the 24-v termi-nal strip. (See Fig. 13.) Connect terminal Y as shown in Fig. 14 forproper operation in cooling mode. Use AWG No. 18 color-codedwire only.The 24-v circuit contains an automotive-type, 3-amp fuse locatedon the main control board. Any direct shorts during installation,service, or maintenance could cause this fuse to blow. If fusereplacement is required, use ONLY a 3-amp fuse of identical size.ACCESSORIES1. Electronic Air Cleaner (EAC)Two spring clamp terminals (for 12 gage maximum, solid orstranded wire), marked EAC-1 and EAC-2, are provided forEAC connection. (See Fig. 13.) These terminals are energizedwith 115v (1.5-amp maximum) during blower motor opera-tion. To connect EAC power leads to furnace control board,strip approximately 1/8 in. of insulation from wire. Openterminal by depressing switch arm with a screwdriver orfinger, and insert wire as shown in Fig. 15.2. Humidifier (HUM)Screw terminals (HUM and Com) are provided for 24-vhumidifier connection. The terminals are energized with 24v(0.5-amp maximum) after inducer motor prepurge period.NOTE: A field-supplied, 115-v controlled relay connected toEAC terminals may be added if humidifier operation is desiredduring blower operation.Step 9—VentingRefer to the National or Local Installation Code such as; NationalFuel Gas Code NFPA No. 54-1996/Z223.1-1996, or the CanadianInstallation Code, CAN B149.1- and .2-M95, for proper ventsizing and installation requirements. Use the enclosed VentingTables for Category I Fan-Assisted Furnaces for a quick, easyreference. The horizontal portion of the venting system shallmaintain a minimum of 1/4-in. upward slope per linear ft and itshall be rigidly supported every 5 ft or less with hangers or strapsto ensure that there will be no movement after installation.Step 10—Start-up, Adjustment, and Safety CheckGENERALNOTE: Proper polarity must be maintained for 115-v wiring. Ifpolarity is incorrect, control board fault indicator light will flashrapidly and furnace will not operate.The furnace must have a 115-v power supply properly connectedand grounded. Proper polarity must be maintained for correctoperation. Thermostat wire connections at R, W, C, and Y must bemade at the 24-v terminal block on the control board. The gasservice pressure must not exceed 0.5 psig (14-in. wc), but must beno less than 0.16 psig (4.5-in. wc).Before operating the furnace, check each manual reset switch forcontinuity. If necessary, press the button to reset the switch.The blower compartment door must be in place to complete the115-v circuit to the furnace.This furnace is equipped with 2 manual reset limit switches inthe gas control area. The switches will open and shut offpower to the gas valve if a flame rollout or an overheatingcondition occurs in the gas control area. DO NOT bypass theswitches. Correct inadequate combustion air supply problemand reset the switches.SEQUENCE OF OPERATIONFurnace control must be grounded for proper operation orcontrol will lockout. Control is grounded through green wirerouted to gas valve and burner bracket screw.Using the schematic diagram shown in Fig. 16, follow thesequence of operation through the different modes. Read andfollow the wiring diagram very carefully.NOTE: If there is a power interruption and any thermostat call,the control will initiate a 90-sec blower only on period beforestarting another cycle.1. Heating modeWhen the thermostat "calls for heat," R-W circuit closes. Thefurnace control performs a self-check, verifies the pressureswitch contacts are open, and starts the inducer motor.Table 6—Electrical DataUNIT SIZEVOLTS—HERTZ—PHASEOPERATING VOLTAGE RANGE MAXIMUMUNIT AMPSMINIMUMWIRE GAGEMAXIMUM WIRELENGTH FT‡MAXIMUMFUSE OR HACR-TYPE CKT BKRAMPS†Maximum* Minimum*050-08 115—60—1 127 104 6.6 14 42 15050-12 115—60—1 127 104 8.1 14 34 15070-08 115—60—1 127 104 6.7 14 42 15070-12 115—60—1 127 104 8.4 14 33 15096-12 115—60—1 127 104 9.2 14 30 15096-16 115—60—1 127 104 10.2 14 28 15115-16 115—60—1 127 104 10.1 14 28 15115-20 115—60—1 127 104 13.3 12 33 20115-22 115—60—1 127 104 15.2 12 29 20135-20 115—60—1 127 104 14.3 12 31 20* Permissible limits of the voltage range at which the unit will operate satisfactorily.† Time-delay fuse is recommended.‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.10→