ICP G9MVE0401410A2 Service And Technical Support Manual

Contents

ICP G9MVE0401410A2 Service And Technical Support Manual Manual pdf 4 page image

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVESpecifications subject to change without notice.4 440 04 4801 00START−UP, ADJUSTMENT, AND SAFETYCHECKNOTICEIMPORTANT INSTALLATION AND START−UPPROCEDURESFailure to follow this procedure may result in a nuisance smokeor odor complaint.The manifold pressure, gas rate by meter clocking, temperaturerise and operation must be checked after installation. Minorsmoke and odor may be present temporarily after start−up fromthe manufacturing process. Some occupants are moresensitive to this minor smoke and odor. It is recommended thatdoors and windows be open during the first heat cycle.General1. Furnace must have a 115-v power supply properlyconnected and grounded.NOTE: Proper polarity must be maintained for 115-v wiring.Control status indicator light flashes code 10 and furnace doesnot operate if polarity is incorrect or if the furnace is notgrounded.2. Thermostat wire connections at terminals R, W/W1, G,and Y/Y2 must be made at 24-v terminal block onfurnace control.3. Natural gas service pressure must not exceed 0.5 psig(14- in. w.c., 350 Pa), but must be no less than 0.16 psig(4.5-in. w.c., 1125 Pa).4. Blower door must be in place to complete 115-v electricalcircuit and supply power to furnace components.UNIT OPERATION HAZARDFailure to follow this caution may result in intermittent unitoperation or performance satisfaction.These furnaces are equipped with a manual reset limitswitch in burner assembly. This switch opens and shutsoff power to the gas valve if an overheat condition (flamerollout) occurs in burner assembly. Correct inadequatecombustion−air supply or improper venting conditionbefore resetting switch. DO NOT jumper this switch.CAUTION!Before operating furnace, check flame rollout manual resetswitch for continuity. If necessary, press button to reset switch.EAC-1 terminal is energized whenever blower operates. HUMterminal is only energized when blower is energized in heating.Setup SwitchesThere are four sets of setup switches on the furnace controlboard. These switches configure the furnace for correctapplication requirement. They also select the airflow settings forAir Conditioning and Continuous Fan CFM.The Setup Switch locations are shown and described onFigure 4, Figure 5 and Table 5. The setup switches are alsoshown on the unit wiring label.Setup Switches (SW1)The furnace control has 8 setup switches that may be set tomeet the application requirements. To set these setup switchesfor the appropriate requirement:1. Remove blower door.2. Locate setup switches on furnace control.3. Configure the set-up switches as necessary for theapplication.4. Replace blower door.NOTE: If a bypass humidifier is used, setup switch SW1-3(Low Heat Rise Adjust) should be in ON position. Thiscompensates for the increased temperature in return airresulting from bypass.Setup Switch (SW2)Setup switches SW2 are used for applications used forTwinning two furnaces of the same model and BTU’s and toadjust airflow. SW2−2 is used to adjust airflow. Refer to theAdjustments section for set up switch configurations. Refer toFigure 5 for configuration of SW2 airflow options.1. Remove blower door.2. Locate setup switch SW2 on furnace control.3. Configure the switches as necessary for the application.4. Replace blower door.Continuous Fan (CF) Setup Switches (SW2−5,SW2−4, SW2−3)The CF setup switches are used to select desired airflow whenthermostat is in continuous fan mode or to select low-coolingairflow for two-speed cooling units. Refer to the Adjustmentssection for set up switch configurations.To set the desired cooling airflow:1. Remove blower door.2. Locate CF setup switches on furnace control.3. Determine air conditioning tonnage used for low cooling(when used) or desired continuous fan airflow.4. Configure the switches for the required airflow.5. Replace blower door.Air Conditioning (A/C) Setup Switches (SW2−6,SW2−7, SW2−8)The air conditioning setup switches are used to match furnaceairflow to required cooling airflow or high stage cooling airflowwhen a two−stage outdoor unit is used. Refer to theAdjustments section for set up switch configurations.To set the desired cooling airflow:1. Remove blower door.2. Locate A/C setup switches on furnace control.3. Determine air conditioning tonnage used.4. Configure the switches for the required cooling airflow.5. Replace blower door.NOTE: Incorrect airflow caused by improper A/C switch setupmay cause condensate blow-off or frozen indoor coil in thecooling mode.