Recover any remaining refrigerant. NOTE: All outdoor unit coils will hold only factory-supplied Page And Replacement c. Start unit in cooling mode. Secure with 2 screws previously removed from unit casing.
Run unit until low pressure switch opens at 27 psig or vapor pressure reaches 5 psig 35kPa. Do not allow Page Care And Maintenance Horizontal Applications only—Place horizontal condensate Page Blower Motor And Wheel clean cooling coil, remove coil access panel. If coil is coated with centered in inlet opening. If not, loosen setscrew and align as dirt or lint, vacuum it with a soft brush attachment.
Be careful not to bend coil fins. If coil is coated with oil or grease, 5. Be careful when removing parts. Replacement section above. Do not drop or bend The motor is turned on through 2 different routes. The first occurs wheel as balance will be affected. Page Liquid Tube Strainer 6. Pull strainer out of coil liquid refrigerant tube and replace with new strainer. Damage may occur to the scroll compressor if operated at a Step 5—Care and Maintenance negative suction pressure during a system pumpdown.
Bleed and if possible recover remaining refrigerant from tubing and coil through gage port on vapor-tube service valve. Refer to Fig. G terminal provides input signal from thermostat signaling 5. If so, check fan coil air filter or air distribution system for blocking or restriction that might reduce If heat pump alone cannot satisfy heat requirements of structure, airflow and cause limit switch to open.
Page 52 Fig. Morris St. Print page 1 Print document 52 pages. Rename the bookmark. Delete bookmark? Cancel Delete. Delete from my manuals? Sign In OR. Don't have an account? Sign up! Restore password. The fan relay is controlled by thermostat and turns fan on and off.
A plug is used as the connection for PCB power and electric heaters. Note the pin numbers on plug. A time-delay relay circuit keeps fan motor running for approximately 90 seconds after G is de-energized. Units are factory wired at V terminal. T terminal is connected through the fuse to R terminal on PCB.
Indoor fan motor yellow lead is wired to C terminal on transformer. Units are factory wired on medium speed blue lead connected. NOTE : Unused fan speed leads must be capped or taped off to prevent direct short to cabinet surface.
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. This causes the relay to close its normally-open contacts, turning on fan. When thermostat no longer calls for the fan,.
The fan will also operate whenever there is a call for electric heat, even if fan relay is not energized. This happens because fan is interlocked with first stage of electric heat through the normally-closed contact of fan relay. W3 and E do not contain an interlock with fan. See outdoor thermostat installation instructions when electric heat staging is desired.
W3 and E also receive signal if wired in with W2. The sequence control is described in the following section:. In straight electric heat, fan is also energized through the normally closed contacts of fan relay. In cooling, heat pump, or manual fan mode, fan will already be running since fan relay would have been energized.
Heaters equipped with relays will be de-energized immediately. If W2 is also satisfied, first stage of electric heat and fan will also turn off, providing thermostat is not calling for the fan.
This causes electric heat to turn off with fan, providing thermostat is not calling for the fan. NOTE : Electric heaters are factory wired with all stages tied together. If independent staging is desired, consult outdoor thermostat installation instructions, or corporate thermostat instructions.
Use wiring schematics shown in Fig. Be sure plug is connected properly. Yellow wire should be connected to Pin No. Black wire should be connected to Pin No. Check field power leads L1 and L2. If these are not receiving power, system cannot function.
Check low-voltage transformer leads R red and C brown. Be sure they are wired to correct locations. Check output voltage of transformer secondary side R red and C brown. Be sure transformer output is between 18Vac and 30Vac. If transformer output is incorrect and transformer is receiving correct input voltage V or V , then transformer needs to be replaced with recommended transformer.
If no problem exists with transformer secondary, proceed to items 3 and 4. Check low-voltage fuse shown in Fig. If fuse is blown, replace it with an identical 5-amp fuse. The transformer cannot supply power to board with fuse blown or loose. If fuse blows when unit has power applied to it, the system most likely has one of the following problems:.
Check all V wiring for an electrical short. The maximum load on transformer is 40 VA. If load on transformer is excessive, the low-voltage 5-amp fuse will blow to protect transformer. If load exceeds VA rating of transformer, a larger VA rated transformer needs to be installed. Check wiring of heaters. If a heater is miswired, fuse may blow. If a heater is miswired, correct miswiring by comparing it to heater wiring label.
Check connections on primary side of transformer. If they are not connected properly, the transformer secondary cannot supply the V signal to energize fan relay. If transformer is receiving correct primary voltage but is not putting out correct secondary voltage, transformer needs to be replaced. Check plug connection between heaters and board. This supplies power to transformer and fan. Check incoming high-voltage power leads. Make sure they are wired to correct location. The unit will not function without proper connections.
Usually whenever a trace is blown on PCB, it means either there has been a high-voltage short or high voltage has been applied to low-voltage circuit. When low-voltage fuse blows, it means transformer would have blown if fuse had not been in circuit to protect it.
The fuse usually. When there is a high current draw on transformer, it is most likely because transformer has been shorted or system is trying to draw more VA than transformer rating allows.
When fuse blows because of high voltage, the system has mixed highand low-voltage signals. Be sure transformer is not shorting out because thermostat wires are miswired. Check wiring of relays as shown in Fig. Be sure low-voltage and high-voltage wiring is correct. Check VA draw on transformer.
If VA draw is more than VA rating of transformer, fuse will blow. If this is the case,. If PCB has no low-voltage power, check blue and black fan leads. If PCB has low-voltage power, check fan relay to see if it is opening and closing. It may be stuck in the normally closed position due to debris in relay. CPC-E 94V The multi-speed ECM motor used with this product contains two parts: the control module and the motor winding section.
Do not assume the motor or module is defective if it will not start. Go through the steps described below before replacing control module or entire motor. The control module is available as a replacement part. It is normal for the motor to rock back and forth on startup. Do not replace the motor if this is the only problem identified.
If the motor is not running:. Check for proper high voltage and ground at the L,G, and N connections at the motor. Correct any voltage issue before proceeding to the next step. The motor is communicated through Vac signals to the 1,2,3,4,5 and C common terminals. Not all taps are programmed, if low voltage is applied to an non-programmed terminal, the motor will not operate, which is normal.
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.
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