There may be more than one disconnect. Tag disconnect switch with a suitable warning label. Cut Hazard. Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs.
Use care and. Previous Page. Next Page. Outdoor unit single zone ductless system sizes 09 to 36 20 pages. Packaged rooftop cooling only units and heat pumps 59 pages. A Turn off accessory heater power if applicable.
Allow used for upflow, horizontal, or downflow kits required on space for wiring, piping, and servicing unit. Page 4 B. Modular Units C. Horizontal Installations The FV4C Fan Coil in sizes , and are available in Be sure installation complies with all applicable building codes that 2- -piece modular construction.
Modular construction allows may require installation of a secondary condensate pan. When using FV4C units with -, -, and -kW and floor. Page 8 Intelligent Heat staging of the electric heat package is possible connection uses reducing washers, a separate ground wire when the FV4C is installed as a part of a single- -speed heat pump must be used. Page 10 Fig. To successfully configure a basic system see information printed on circuit board Easy Selectt taps are used by the installer to configure a system.
Page 11 CFM per ton. The factory setting Guide is AC. See Fig. This configuration will improve the The airflow sensor turns on electronic air the range of a standard fan coil. Page 13 the full cooling or cooling plus dehumidify mode requested value. Page 14 Disconnect all electrical power to unit before performing any maintenance or service on it.
Page 15 2. Dry coil at volts and with 10KW heater and filter installed. Airflows shown are at standard air conditions. Morris St. Print page 1 Print document 19 pages. Rename the bookmark. Verify the part number of the motor matches the correct replacement motor part number for the unit model number.
Initiate a demand from the thermostat and check the voltage between C common and terminal 1- 5. Prior to installing the replacement control module, the motor section condition needs to be verified.
Check to see if the blower wheel spins freely. To check for short to ground, use an ohmmeter to measure the resistance from any one of the motor connector pins to the aluminum end plate of the motor. This resistance should be greater than , ohms. Check the motor phase-to-phase resistance between each of the leads in the three-pin motor connector.
The lead-to- lead resistance across any two leads should be less than 20 ohms. If any motor fails any of the three tests, do not install a new control module. The new control can fail if placed on a defective motor. The current fan coils do not use the printed circuit board and rely on the motor control programming to provide the off-delay timing. This resistor is no part of the wiring harness, as shown on wiring diagram. The resistor is a 2-watt, ohm resistor.
If the resistor has failed open, a likely cause is due to the power stealing thermostat. Connecting C common may resolve the issue. Having an open resistor should not affect the operation of the motor. The fan speed selection is done at the motor connector. Units with or without electric heaters require a minimum CFM. Refer to the unit wiring label to ensure that the fan speed selected is not lower than the minimum fan speed indicated.
Speed-taps 1, 2, and 3 have a second blower off time delay pre-programmed into the motor. Speed-tap 4 is used for electric heat only with 0 second blower time delay and the WHITE wire should remain on tap 4.
Speed-tap 5 is used for high static applications, but has a 0-second blower time delay pre-programmed into the motor. Also, see Fig. NOTE : In low static applications, lower motor speed tap should be used to reduce possibility of water being blown off coil.
Unlike fan coils using induction motors where static pressure affects airflow, these fan coils are constant airflow units. The blower delivers requested airflow regardless of static pressure. Consult fan coil Product Data for static pressure limits. The ECM2. Blower characteristics requested airflow, torque, and speed are known from laboratory testing If any two characteristics are known, the third is defined.
Requested airflow is known from Easy Select board configuration and thermostat signals. Torque is known because it is directly related to stator current, which is measured by motor control. Speed is measured by counting back EMF pulses from stator windings.
This information is entered into an expression that calculates torque from speed and airflow numbers. If calculation does not match stored blower characteristics, torque is adjusted until agreement is reached. This calculation and adjustment is performed every 0.
There is no direct measure of static pressure, but unit does react to a change in static to maintain constant airflow. A change in pressure will result in a change in stator speed and torque. The motor will begin to adjust on the next sampling, calculate new desired speed and torque, and adjust as necessary.
An ECM2. See Fig. The AC power is then internally rectified to DC by a diode module. After rectification, DC signal is electronically communicated and fed in sequential order to three stator windings. The frequency of these commutation pulses determines motor speed. The rotor is permanently magnetized.
The motor will not run with high voltage alone. Low voltage must be applied to control plug to run motor. The C side of low-voltage control power circuit is connected by printed circuit runs to motor Connector -Pins 9, 10, and 11 then through motor control harness to motor. The low-voltage circuit is fused by a board-mounted 5-amp automotive-type fuse placed in series with transformer SEC2 and R circuit. The C circuit of transformer is referenced to chassis ground through a printed circuit run at SEC1 connected to metal standoff marked.
The board offers choices of electric. The installer should select the correct size of components that are being installed in each installation. Some outdoor unit models will not work properly with this fan coil. Power for system is supplied from a Vac, Hz line. Class 2 voltage 24 Vac nom. The Vac secondary circuit includes 5-amp automotive-type fuse in SEC2 circuit. Connection to heater panel is made through pin connector PL Connections to thermostat are made at screw terminals.
Twenty-one pin terminals comprise field select taps for motor. Twenty-one 0. The 6 selection modes are listed below. For additional information, refer to Easy Select Configuration Taps section.
The thermostat closes circuit R to G. The unit delivers the airflow selected for fan only operation. A circuit R to Y1 is required for two-speed high operation. J1 jumper must be pulled from Easy Select Board. Dehumidification is active when 24Vac is removed from DH terminal. Unit delivers 20 percent less airflow. This signals the fan coil to run at minimum airflow for maximum humidity removal. The control will cycle the equipment 10 minutes on and 10 minutes off until satisfied.
Selected delay profile is active in this mode. Thermostat closes R to G and R to Y1. Thermostat should already have closed R to G, R to Y2 for heat pump heating operation. With J2 jumper in place, energizing either W1 or W2 will produce the W2 airflow. This is the greater of heat pump heating and auxiliary heat airflow plus an additional 15 percent.
The elected delay profile is not active in this mode. The auxiliary heat can be staged by removing the J2 jumper that ties W1 and W2 terminals together. Staging can be done by using outdoor thermostats or by using the Intelligent Heat Staging option where the indoor control can be configured for three-stage electric heat. The unit will automatically adjust airflow when the different stages of heat are energized.
The airflow delivered will depend on the heat pump size selected and electric heat size selected. The greater of the two airflows will be delivered. The selected delay profile is not active in this mode.
Thermostat closes R to W and thermostat should be set up to energize G with W. This is due to the Super Comfort Heat programming in the motor. When this option is selected, the indoor control will monitor the outdoor temperature. This triggers the motor to slow to approximately CFM per ton. The heaters will stage as needed during this mode and the motor will adjust airflow as required. The Easy Select taps are used by installer to configure system. Airflows are based on system size and mode of operation and those airflows are modified in response to other inputs such as the need for de-humidification.
The FV4 Fan Coils must be configured to operate properly with system components with which it is installed. To successfully configure a basic system see information printed on circuit board located next to select pins , move the six select wires to pins which match components used, along with homeowner preferences. The installer must select the auxiliary heat airflow approved for application with kW size heater installed. Each select pin is marked with a range of heaters for which airflow also marked is approved.
For increased comfort select the narrowest kW range matching the heater size, for example, for a kW heater. This airflow must be greater than the minimum CFM for electric heater application with the size system installed for safe and continuous operation. Note that airflow marked is the airflow which will be supplied in emergency heat mode and heating mode on air conditioners when electric heat is primary heating source.
To ensure safe heater operation in heat-pump heating mode, when electric heaters are energized, the ECM2. The factory default selection is largest heater range approved. The factory default setting for air conditioner or heat pump size is largest unit meant for application with model of fan coil purchased.
The installer needs to select air conditioner or heat pump size to ensure that airflow delivered falls within proper range for size of unit installed in all operational modes.
Unpack unit and move to final location. Remove carton taking care not to damage unit. Inspect equipment for damage prior to installation. File claim with shipping company if shipment is damaged or incomplete. Welcome to ManualMachine. We have sent a verification link to to complete your registration. Log In Sign Up. Forgot password?
Enter your email address and check your inbox. Please check your email for further instructions. Enter a new password. Carrier Fb4cnf Owner's Manual Download for 1. Shut off power before servicing. Transformer A VA transformer supplies V power for control circuit. NOTE : Transformer is fused. Do not short circuit.
Fan Relay Relay coil is V. Check for proper control voltage. Replace relay if faulty. Transformer 1. Indoor Fan 1. Wiring Indoor fan motor yellow lead is wired to C terminal on transformer. Functional Control a. Thermostat and Relay Control When thermostat calls for the fan in cooling, heat pump, heating, or fan-only mode, a Vac signal is sent to relay.
The sequence control is described in the following section: 1. If fuse blows when unit has power applied to it, the system most likely has one of the following problems: a. If Transformer Fuse Keeps Blowing: When low-voltage fuse blows, it means transformer would have blown if fuse had not been in circuit to protect it.
If Fan Runs Continuously: 1. Transformer Failure: Check V and V transformer connections. They may be miswired. A Fig. If the motor is not running: 1. Fan Speed Selection The fan speed selection is done at the motor connector. Speed Taps may be located on motor, or on plug close to motor. FV4 Constant Air Flow Unlike fan coils using induction motors where static pressure affects airflow, these fan coils are constant airflow units.
Low-Voltage Circuit Fusing and Reference The low-voltage circuit is fused by a board-mounted 5-amp automotive-type fuse placed in series with transformer SEC2 and R circuit. Auxiliary Heat Range The installer must select the auxiliary heat airflow approved for application with kW size heater installed.
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