Lennox MWCA009S4 Service Manual Download Page 39

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Step 6.

Remove the screws on the rear coil guard and

then remove the coil guard.

Front Cover

Step 7.

Remove the screws from the right panel and then

remove panel.

Right 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 the top cover and then

remove. One of the screws is located underneath

the handle.

Top Cover

Step 4.

Remove the screws from the front panel and then

remove panel.

Front Panel

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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