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12

•  Direct 

(Direction) 

button

. Press to move louvers up 

and down in six degree increments. Louvers remain in 

place where stopped. 

•  LED

 button. Press the 

LED

 button to turn on the indoor 

unit display (on units with display). Press the button 

again to turn off the display.

•  Follow (Follow Me) button

. Press to activate the 

wireless remote’s air temperature sensor. This will 

also transfer the temperature sensing function from 

the indoor unit to the remote. The indoor unit’s air 

temperature sensor will be disabled. The indoor unit 

will regulate the room temperature based on the 

temperature sensor in the remote controller, rather than 

the sensor in the indoor unit. 

The remote controller will send the indoor unit a signal 

every three minutes. If the indoor unit doesn’t receive 

the signal for seven minutes, or if the button is pressed 

again, the 

Follow Me

 function will terminate. 

 

The remote controller must remain pointed toward the 

indoor unit and must be within 26 feet (8 meters) of 

the unit. Do not remove the controller from the room 

or obstruct the signal of the remote controller during 

Follow Me

 operation.

6.4.  Display

See  “Figure  11.  Remote  Controller  Display”  on  page  11 

for illustration of remote control.

•  Remote controller On. 

Icon displays to indicate that 

the remote controller is on

.

•  Transmitting display

. Icon blinks once when a signal 

is sent from the wireless remote controller.

•  Operation mode

. These icons show the current mode 

of operation. Press the mode button to scroll through 

the operation modes: 

 

Cool

 → 

Dry

 → 

Fan

.

•  Setpoint or Room Temperature

. Displays the setpoint 

temperature during normal operation. Displays the 

room temperature when in Follow me mode. Adjust the 

setpoint with up and down arrow buttons. No display 

when unit is in fan mode. 

•  Timer ON/OFF

. These icons light up to indicate that 

the indoor unit has a timed auto-start or auto-stop set-

up. 

•  Battery charge status

. Icon displays charge status 

of wireless remote controller batteries. Only appears 

when battery is low.

•  Sleep mode.

 Icon displays to indicate that sleep mode 

operation is on.

•  Follow me.

 This icon displays when the air 

temperature sensor in the wireless remote controller is 

the sensor being  used by the indoor unit. When this 

function is off, the indoor unit uses a built-in sensor. 

When the function is set to on, this option may help in 

maintaining a closer comfort level in most cases.

•  Fan speed

. Displays the current fan speed.

6.5.  Operations

6.5.1.  Start/Stop Operation 

Press the 

LED

 power button.

• 

Controller ON

: LED power button lit brightly.

• 

Controller OFF

: LED power button not lit.

6.5.2.  Select Fahrenheit or Celsius

Press and hold the 

Up

 and 

Down

 buttons at the same time 

for three seconds to toggle between Fahrenheit and Celsius.

To Set the Operation Mode 

Press the 

Mode

 button to scroll through the mode selections.

• 

Cool

 – System operates in cooling mode.

• 

Dry

 – System removes humidity according to preset 

conditions (fan speed and setpoint temperature). 

Cannot adjust fan speed.

NOTE: 

Temperature will be 6-8 degrees colder if this 

mode is used.  

• 

Fan

 – This is for Fan only, no cooling.

To set (or change) the room temperature setting (set point) 
Press the 

up

 and 

down

 arrow buttons to adjust the setpoint.

6.5.3.  Cool/Fan mode

1. 

Press the 

Mode

 button to select either 

Cool

 or 

Fan

.

2. 

Adjust the temperature setpoint using up and down arrow 

buttons (range 62°F – 86°F).

3. 

Press the 

Fan

 

Speed

 button to select 

Auto

Low

Med

or 

High

 fan speed.

NOTE: 

Temperature set point is not displayed in fan 

mode. 

6.5.4.  Dry Mode

1. 

Press the 

Power

 button. An LED light on the indoor unit 

displays. 

2. 

Press the 

Mode

 button to select Dry.

3. 

Adjust the temperature setpoint using up and down arrow 

buttons.

NOTE: 

Temperature will be 6-8 degrees colder if this 

mode is used.  

NOTE: 

Fan speed is not adjustable in dry mode.

6.5.5.  Timer Operation

Timer ON and Timer OFF are used to turn on and turn off the 

indoor unit at selected intervals.

6.5.6.  Timer ON Operation

1. 

Press the 

Timer ON

 button. The Timer ON icon, the last 

auto-on time, and “

h

”  will display.  

2. 

Press the 

Timer ON 

button again to set the amount of 

time before the indoor unit begins operation. Each press 

will  increase  the  time  in  half  hour  increments  until  10 

Summary of Contents for MWCA009S4

Page 1: ...r Operation 12 6 5 6 Timer ON Operation 12 6 5 7 Timer OFF Operation 13 6 5 8 Modify Timer ON OFF settings 13 7 Connection to Centralized Controller 13 7 1 Set Indoor Unit Address for Centralized Cont...

Page 2: ...Refrigeration Circuit 26 13 7 1 Evacuation of the Complete Refrigeration Circuit Indoor and Outdoor Unit 26 13 7 2 Refrigerant Charging 27 14 Electronic Function 27 14 1 Abbreviation 27 14 2 Electric...

Page 3: ...ations Indoor Unit Model No MWCA009S4 MWCA012S4 MWCA018S4 MWCA024S4 Nominal Size Tons 0 75 1 1 5 2 Power Supply 60 hz 1 phase 208 230V 115V 208 230V 208 230V 208 230V Rated load amps 0 22 0 43 0 22 0...

Page 4: ...VIEW BOTTOM VIEW SIDE VIEW SIDE VIEW Figure 1 Indoor Unit Dimensions Inches mm Size A B C in mm in mm in mm 9K 29 5 8 752 11 3 8 289 8 5 8 219 12K 32 3 4 832 11 3 4 298 8 3 4 222 18K 39 1 8 994 12 1...

Page 5: ...Hole 2 1 2 in 64 mm diameter Left Rear Hole 2 1 2 in 64 mm diameter Wall Mount Unit Outline 1 3 4 44 1 3 4 44 16 3 4 425 9 1 8 232 5 127 31 5 8 803 7 1 2 191 11 3 4 298 1 3 4 44 Figure 3 12K Indoor U...

Page 6: ...ft sec 1 6 ft sec 1 6 ft sec 1 6 ft sec 1 6 ft sec 1 6 ft sec 3 2 ft sec 6 6 ft sec 8 2 ft sec 11 5 ft sec 8 ft 9 in 6 ft 6 in 3 ft 3 in 0 ft 0 in 0 ft 0 in 3 ft 3 in 6 ft 6 in 9 ft 8 in 13 ft 1 in 19...

Page 7: ...Electric Code NEC In Canada wiring must conform with current local codes and the current Canadian Electrical Code CEC 4 1 Overview Refer to unit nameplate for minimum circuit ampacity and maximum over...

Page 8: ...4 4 1 1 2 2 3 3 5 5 6 6 7 7 C C 9 9 A A B B D D E E F F 1 1 2 2 ON ON 0 0 8 8 4 4 1 1 2 2 3 3 5 5 6 6 7 7 C C 9 9 A A B B D D E E F F 1 1 2 2 ON ON ENC2 S1 ENC2 S1 0 F 0 F 0 F 0 F 0 F 0 F 0 F 0 F NET...

Page 9: ...WIRING DIAGRAM WIRING DIAGRAM 2 1 1 2 3 4 1 2 3 4 2 4 2 1 2 1 2 1 2 1 2 1 CN_L1 M M 2 2 WHITE WHITE CN_N1 CN_S FAN CAPACITOR BOARD FAN CAPACITOR BOARD PC1_1 PC1_1 PC2_1 PC2_1 1 2 3 4 5 1 2 3 4 5 SWIN...

Page 10: ...peeds in the following order SLEEP Saves energy during sleeping hours NOTE Hold button for 2 seconds to activate Silence function TURBO Enables unit to reach preset temperature in shortest possible ti...

Page 11: ...setpoint 2 F 1 C per hour for the first two hours The modified setpoint will be set for five hours After seven total hours the indoor unit will shut off Pushing the on button will turn the unit back...

Page 12: ...s low Sleep mode Icon displays to indicate that sleep mode operation is on Follow me This icon displays when the air temperature sensor in the wireless remote controller is the sensor being used by th...

Page 13: ...S1 dip switch and the S2 dial switch to set the address for each indoor unit The table below shows how to set the unique addresses All indoor units are factory set to 0 To change the address to 1 move...

Page 14: ...was set for dry mode 7 3 2 Dry Mode Operation Sequence When in dry mode operation the unit is actually in cooling mode with a low speed blower operation The compressor will stop when the room tempera...

Page 15: ...the indoor unit installation process 7 6 Ambient Temperature is Below 63 F 17 C You can t use the remote controller to turn on the COOL function when the ambient temperature is below 17 C In this ins...

Page 16: ...1 51 5 53 5 57 Refrigerant R 410A Charge furnished 115V 1 lb 5 oz Charge furnished 208 230V 1 lb 2 oz 1 lb 3 oz 2 lbs 0 oz 2 lbs 9 oz Maximum line length with furnished charge ft 20 20 20 30 Additiona...

Page 17: ...perature F Dry Bulb Indoor Temperature F Dry Bulb Wet Bulb 65 F 54 F 70 F 59 F 75 F 63 F 80 F 67 F Total mBtuh Sensible mBtuh Total mBtuh Sensible mBtuh Total mBtuh Sensible mBtuh Total mBtuh Sensible...

Page 18: ...98 6 78 8 44 7 17 8 76 7 44 9 17 7 79 122 7 14 6 35 7 43 6 61 7 79 6 94 8 16 7 26 8 3 3 012 208 230V Outdoor Temperature F Dry Bulb Indoor Temperature F Dry Bulb Wet Bulb 65 F 54 F 70 F 59 F 75 F 63...

Page 19: ...5 11 76 10 59 12 53 11 27 13 09 11 78 13 92 12 53 122 10 59 9 85 11 09 10 31 11 71 10 89 12 39 11 52 8 3 5 024 208 230V Outdoor Temperature F Dry Bulb Indoor Temperature F Dry Bulb Wet Bulb 65 F 54 F...

Page 20: ...IDE VIEW 12 5 8 322 11 1 4 286 2 3 8 60 3 5 8 92 DRAIN HOLE bottom of unit 11 3 4 298 Figure 18 09 12K and 18K Outdoor Unit Dimensions Inches mm MCA024S4S 27 5 8 702 BOTTOM VIEW FRONT VIEW SIDE VIEW S...

Page 21: ...TS If the height of the wall C is less than or equal to the height of the smallest unit A the distance from the unit to the wall B must be a minimum of 10 inches 254 mm If 1 2 the height of the unit A...

Page 22: ...itations OUTDOOR UNIT OUTDOOR UNIT INDOOR UNIT INDOOR UNIT Maximum Line Set Length Maximum Line Set Length Maximum Elevation Outdooor Unit BELOW Indoor Unit Maximum Elevation Outdooor Unit ABOVE Indoo...

Page 23: ...n x 25 ft 90X52 N A N A 1 4 in x 1 2 in x 50 ft X0259 N A N A 3 8 in x 5 8 in x 25 ft X8406 N A 3 8 in x 5 8 in x 50 ft X8407 N A 10 1 Pipe Length Maximum piping length and height difference Table 5 P...

Page 24: ...risk of fire Wiring must be installed so that all cover plates can be securely closed In the U S A wiring must conform with current local codes and the current National Electric Code NEC In Canada wir...

Page 25: ...there are any leaks Fully close the Handle Lo valve of the manifold valve and turn off the vacuum pump After five minutes confirm that the gauge needle is not moving Turn the flare nut on the three wa...

Page 26: ...18N m Be sure to check for gas leakage 13 6 2 Air Purging with Vacuum Pump Completely tighten the flare nuts of the indoor and outdoor units confirm that both the two way and three way valves are set...

Page 27: ...refer to the previous instruction when vacuum and recycle refrigerant 14 Electronic Function 14 1 Abbreviation T1 Indoor ambient temperature T2 Middle indoor heat exchanger coil temperature T3 Outdoo...

Page 28: ...hen the compressor discharge is getting higher the running frequency will be limited as below rules If 215 6 F 102 C T5 244 4 F 115 C decrease the frequency to the lower level every two minutes until...

Page 29: ...5 162 80 67 26 67 19 44 103 104 123 138 135 129 132 140 162 173 90 73 32 22 22 78 112 113 139 152 149 138 145 154 180 189 17 2 Capacity Request Calculations Total capacity Request Norm code HP 10 modi...

Page 30: ...while the maximum running frequency will be adjusted according to the outdoor ambient temp 17 3 Outdoor Fan Control 17 3 1 Cooling Mode Normally the system will choose the running fan speed according...

Page 31: ...31 38 Exit low ambient cooling mode run with high fan for 1 minute Low 30 27 23 off...

Page 32: ...the front panel by the tabs on the both sides and lift it TAB Step 2 Push up the bottom of an air filter step 1 and then pull it out downwards step 2 FILTER Step 3 Open the horizontal louver and push...

Page 33: ...eft then remove it Step 6 Disconnect the connector for display board Step 7 Slide the front panel side to side to release each axis Step 8 Open the screw cap and then remove the three screws Step 9 Re...

Page 34: ...in the direction shown in the right picture 18 1 2 Electrical Parts NOTE When handling electrical parts use anti static gloves NOTE Remove the front panel see Step 1 on page 32 before disassembling el...

Page 35: ...the step motor and the T2 sensor Step 6 Open the left side plate of electronic control box Step 7 Open the two clips on the front of the electric box Step 8 Open the upper cover plate of electronic c...

Page 36: ...front panel and electrical parts see both Front Panel on page 32 and Electrical Parts on page 34 Electrical parts before disassembling evaporator Step 1 Disassembly the pip holder located at the rear...

Page 37: ...ard of the fan motor Screws Step 2 Remove the bearing sleeve Step 3 Remove the fixing screw Step 4 Pull out the fan motor and fan assembly from the side Fixing Screw 18 1 5 Step Motor NOTE Remove the...

Page 38: ...ker Step 2 Remove the screw of the big handle and then remove the handle Step 3 Remove the screws of the top cover and then remove top cover One of the screws is located underneath the big handle Top...

Page 39: ...Panel 18 2 2 Panel Plate MWCA024S4 Step 1 Turn off the air conditioner and the power breaker Step 2 Remove the screws that secure the handle and then remove the handle Step 3 Remove the screws from th...

Page 40: ...nsor T3 outdoor ambient temperature sensor T4 and discharge temperature sensor TP Step 4 Disconnect the expansion valve Step 5 Remove electronic control box Compressor T3 T4 and TP EEV Fan Motor 4 way...

Page 41: ...emove electronic control box Compressor Reactor 4 way valve Fan Motor EEV T3 T4 and TP 18 2 6 Fan Disassembly MWCA009S4 and MWCA012S4 NOTE Antistatic gloves must be worn when you dissemble the electro...

Page 42: ...e screws securing the cover of the electronic control box cover Step 3 Disconnect connector from electronic control board plug Step 4 Remove the screws securing the fan motor to body Then remove fan m...

Page 43: ...securing the fan motor from body Remove the fan Fan Motor 18 2 9 Sound Blanket NOTE Recover refrigerant before removing the compressor Sound Blanket Sound Blanket side 18 2 10 Compressor NOTE Recover...

Page 44: ...the hex nuts and washers which are located on the bottom of the plate which are securing the compressor Step 4 Heat up the brazed parts and then remove the discharge and suctions pipes Step 5 Lift the...

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