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Страница: 19 / 24

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19

PUMP CONTROL:

LOW VOLTAGE CONTROL BOARD

During the heating season the pump is controlled by the low voltage
circuit control board.

The control board also operates as an off season pump circulator to
eliminate stagnant water in the heat exchanger. This pump cycle will
operate for 1 minute every 12 hours after the last call for heat.

SEQUENCE OF OPERATION IN HEATING MODE:

1.

When the thermostat calls for heat (W) the pump and blower motor
will run at the selected operating fan speed.

2.

When the thermostat ends the call for heat (W) the pump and
blower turn off. The blower will continue running at the
continuous low speed if the thermostat is set to FAN-ON.

Note: Upon powering up

the air handler circuit

board starts a 15 second

initialization during which

the pump operates for 5

seconds.

Circuit board LED

illuminates when the

pump is operating during

heating and pump purge

cycles.

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Содержание CAH 33-44-50

Страница 1: ...CAH SERIES INSTALLATION MAINTENANCE MODELS CAH 33 44 50 CAH 49 54 70 ...

Страница 2: ...S 8 SUPPLY AND RETURN DUCT REQUIREMENTS 9 THERMOSTAT SELECTION 12 SELECTING FAN SPEEDS 12 BLOWER MOTOR WIRE SELECTION CHART 13 HOT WATER COIL PIPING 14 OPERATION AND MAINTENANCE 15 INITIAL START UP 15 AIR FILTER 18 BLOWER MOTOR 18 CIRCULATION PUMP REPLACEMENT 18 PUMP CONTROL 19 SEQUENCE OF OPERATION IN HEATING MODE 19 TROUBLESHOOTING 20 MOST LIKELY PROBLEMS AND CAUSES 20 FAULTY CIRCUIT BOARD 22 WI...

Страница 3: ...3 DIMENSIONS MODEL A B C D E F CAH 33 44 50 17 23 35 5 12 18 11 CAH 49 54 70 21 25 23 43 75 16 18 17 ALL MEASUREMENTS IN INCHES ...

Страница 4: ... 58 000 1200 CFM 65 000 1600 CFM 76 000 POWER SUPPLY 120 VAC 1PH 60HZ 120 VAC 1PH 60HZ TOTAL AMPS 5 5 9 5 MAXIMUM FUSE 15 15 TRANSFORMER 30 VA 30 VA BLOWER MOTOR 1 3HP ECM 3 4HP ECM PUMP 3 SPEED 3 SPEED WATER CONNECTIONS 1 2 1 2 FILTER SIZE 12 x 20 x 1 18 x 20 x 1 OUTPUT BTU 3GPM OUTPUT BTU 4GPM ...

Страница 5: ...lude factory installed valves Others must be field installed Follow the instructions of the water heater manufacturer and local codes when installing the T P valve Do Not alter the water heater controls dip tube relief valve fitting etc Do Not install unit or connecting piping in any manner except as shown in this instruction manual Do Not install a DX cooling Coil in close proximity to the Hot Wa...

Страница 6: ...n such cases the Temperature and Pressure Valve of the water heater may weep OR relieve due to expansion of the water when heated Note that this would occur even if this air handler were not installed A small diaphragm type thermal expansion tank will normally eliminate the weeping condition Please read and follow the manufacturer s instruction for installation of such tanks Further Note The above...

Страница 7: ...ooling The freeze stat typically opens at 38 F closes at 60 F and is wired to interrupt the A C compressor operation Mount the freeze stat on the suction line of the cooling coil and wrap with cork tape covering both the stat and the suction line If the freeze stat is not securely fastened and insulated to the suction line the compressor may not shut off if the evaporator coil freezes up ...

Страница 8: ...pplications and all models comply with zero clearance installation to combustible materials Sufficient clearance must be provided to allow access to electrical controls and to the blower motor assembly for servicing This clearance distance should be approximately the same as the depth of the fan coil unit at a minimum LINE AND CONTROL WIRING REQUIREMENTS All wiring must meet with local and nationa...

Страница 9: ...d on the fan coil unit If there is no ducted return installation codes may limit the unit to installation only in a single story residence Ducting should normally be sized for external static pressures of 0 15 to 0 3 inches H2O total Figure 1 Figure 2 Figure 1 Correct way to duct plenum off of air handler whenever possible in a new installation Figure 2 Incorrect way to duct plenum off of air hand...

Страница 10: ...10 Figure 3 Figure 4 Figure 3 Correct way to install duct work Figure 4 Incorrect way to install duct work ...

Страница 11: ...11 Typical Air Handler Schematic ...

Страница 12: ...e settings are selected by moving the wires on the motor tap selection tree located in the blower mounted electrical box Use the Blower Motor Wire Selection Chart in this manual to select the proper wires for your application HEAT COOL FAN SPEED select the appropriate motor tap wire to plug into this terminal This is the speed the motor will run for both heating and cooling LOW CONTINUOUS FAN sele...

Страница 13: ...EED LOW CONTINUOUS SPEED YELLOW TRACE 600 CFM 1000 CFM BLUE TRACE 800 CFM 1200 CFM PURPLE TRACE 800 CFM BOOST 1200 CFM BOOST BLACK TRACE 1000 CFM 1600 CFM EXAMPLE Model CAH 33 44 50 Blue Trace wire onto the heat cool fan speed Terminal Unit will run at 800 cfm for both heating and cooling 0 4 external static ...

Страница 14: ...should be copper and should never exceed 100 feet of total equivalent piping On runs over 60 feet equivalent it is recommended that nominal 7 8 OD piping be used to prevent excessive system pressure drop Vertical rises should be kept as short as possible Where extended runs or large vertical rises are required greater than 5 feet it is recommended that the installer consult the factory for proper ...

Страница 15: ...rated in heating mode until the user supplied installed isolation valves have been opened and the hot water coil and hot water lines have been purged of air Heating Mode Initial Operation 1 Fill the water heater refer to water heater instruction Open a domestic hot water faucet while filling the water heater to vent the air When the tank is full and all of the air is purged close the faucet 2 Igni...

Страница 16: ...supply and return isolation valves to allow water to flow through the system Note it will often require purging several gallons of water so either have a bucket available or an alternate means of discarding the water 4 Switch the room thermostat to the heat position and raise the temperature setting to a position approximately five to ten degrees above the room temperature Note The door switch mus...

Страница 17: ... S and DON TS section for mixing valve requirement for higher temperatures depending upon unit selection temperature Allow the system to operate long enough for all temperatures to stabilize and recheck temperature setting Remember that the domestic supply water temperature should be kept to 120 F or lower by means of an appropriate mixing valve ...

Страница 18: ...sition terminal strip on the blower mounted electrical box Unplug the power supply MOLEX terminal from the top of the blower mounted electrical box Remove the two blower mount screws and slide blower and motor from the unit CIRCULATION PUMP REPLACEMENT Disconnect electrical power before servicing the unit To replace the circulating pump close the isolation valves and relieve the water pressure fro...

Страница 19: ...NCE OF OPERATION IN HEATING MODE 1 When the thermostat calls for heat W the pump and blower motor will run at the selected operating fan speed 2 When the thermostat ends the call for heat W the pump and blower turn off The blower will continue running at the continuous low speed if the thermostat is set to FAN ON Note Upon powering up the air handler circuit board starts a 15 second initialization...

Страница 20: ... the water circuit Purge air from the system as described under start up procedure Insufficient or No Heat 1 Air may still be trapped in heating loop Purge air from the system as described under start up procedure 2 Water heater thermostat not turned up high enough Remember higher than 120 F mixing valve for domestic service 3 Inlet and outlet piping connection at the air handler may be reversed S...

Страница 21: ...stalled and firmly plugged into the motor Check voltages in the cables 3 Check door switch depressed power supply and thermostat lines are wired properly Refer to the electrical diagram supplied with each air handler 4 Check the voltages at motor plugs 120VAC and 24VAC 5 There may be a faulty TAP on the motor Select a different speed on the motor tap selection tree Refer to the Selecting Fan Speed...

Страница 22: ...ted check that the board fuse is not blown and replace if necessary If there is malfunction a temporary circuit board bypassed can be utilized until a replacement circuit board is installed With the power off remove the fuse from the circuit board Move the PUMP wire Orange Black stripe and the High Fan wire White Red Stripe to the two extra W terminals This will allow the pump and blower to run wi...

Страница 23: ...23 WIRING DIAGRAMS ...

Страница 24: ...24C T5 X PTRA 1C 24C T5 X TRANSFORMER PU30va PU30va MOTOR CAH37 1 3ECM CAH58 3 4ECM DOOR SWITCH CARLING TA20B CARLING TA20B COIL BC9061 BC7923FX HOUSING DC1016 600 5 DC1020 800 5 PUMP UPS15 58RU UPS15 58RU CHECK VALVE 96806141 96806141 CONTROL BOARD PT ECB V1 0 PT ECB V1 0 ...

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