Lennox MWHA009S4 Service Manual Download | Manualshive

Page: 40 / 52

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Step 4.

Remove the fixed devices of the connectors.

Step 5.

Disconnect the connectors of fan motor, 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 control

box.

Step 9.

Remove 1 screw and open the 2 clips along the

direction indicated in image below.

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Summary of Contents for MWHA009S4

Page 1: ...Operation Indoor Units 12 6 3 1 Procedure 12 6 3 2 Dry Mode Operation Sequence 13 6 4 Test Run Indoor Units 13 6 4 1 Test Run Instructions 13 6 4 2 Before Test Run 13 6 5 Double Check Pipe Connection...

Page 2: ...on of the Complete Refrigeration Circuit Indoor and Outdoor Unit 31 12 7 2 Refrigerant Charging 31 13 Electronic Function 32 13 1 Abbreviation 32 13 2 Electric Control Working Environment 32 14 Adding...

Page 3: ...Room Temperature Range F Cooling 62 90 62 90 62 90 62 90 Heating 32 86 32 86 32 86 32 86 Air Volume cfm High Medium Low 247 182 129 309 285 187 294 212 171 324 282 212 Sound Data dBA Low Medium High 3...

Page 4: ...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 2 318 9 7 8 251 24K 44 1118 13 1 4 337 10 1 4 260 1 4 Indoor Unit Clearances FRONT VIEW Wall Vertical Clearance Clearance to Floo...

Page 5: ...48 6 7 8 175 8 5 8 219 1 7 8 48 Figure 5 24K Indoor Unit Wall Plate Dimensions Inches mm 1 6 Indoor Outdoor Matches Indoor Unit Type Outdoor Unit Indoor Unit Cooling Capacity SEER EER Heat Capacity HS...

Page 6: ...2 ft sec 11 5 ft sec 4 9 ft sec 3 0 ft sec 3 0 ft sec 0 6 ft sec 0 6 ft sec 0 6 ft sec 9 8 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 ft 7 in...

Page 7: ...ectric Code NEC In Canada wiring must conform with current local codes and the current Canadian Electrical Code CEC 3 1 Overview Refer to unit nameplate for minimum circuit ampacity and maximum over c...

Page 8: ...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 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 0 0 8 8 4 4 1 1 2 2 3 3 5 5 6 6...

Page 9: ...o scroll through the fan speeds Auto Low Med High Sleep button Press to activate night mode This will automatically increase cooling or decrease heating the setpoint 2 F 1 C increment per hour for the...

Page 10: ...ntroller 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 sc...

Page 11: ...Press the Mode button to select Dry 3 Adjust the temperature set point using up and down arrow buttons NOTE Fan speed is not adjustable in dry mode Using dry mode will over shoot the set point by 6 8...

Page 12: ...nit Connection Points for Centralized Controller Mini split indoor units can be connected to a centralized controller e g Lennox VRF Manager LVM or Trane Tracer or a BACnet or LonWorks gateway using t...

Page 13: ...t a time 4 Let each function run for five minutes and perform the following checks 6 4 2 Before Test Run Table 3 Test Run Checklist Checks Pass Fail No electrical leakage Unit is properly grounded All...

Page 14: ...14 Manual control button Figure 15 Manual Button Location...

Page 15: ...R 410A Charge furnished 1 lb 14 oz 1 lb 14 oz 2 lbs 12 oz 3 lbs 15 oz Maximum line length with furnished charge ft 25 25 25 25 Additional charge required per ft oz 0 16 0 16 0 16 0 32 Compressor No a...

Page 16: ...y 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 mBtuh 13 7 4...

Page 17: ...mBtuh Sensible mBtuh Total mBtuh Sensible mBtuh Total mBtuh Sensible mBtuh 13 7 13 5 07 7 38 5 22 7 97 5 67 8 43 5 94 5 7 62 5 45 7 98 5 74 8 62 6 16 9 07 6 47 4 7 73 5 65 8 19 5 96 8 79 6 43 9 25 6...

Page 18: ...ble mBtuh Total mBtuh Sensible mBtuh Total mBtuh Sensible mBtuh 13 9 07 6 41 9 59 6 78 10 06 7 25 10 48 7 55 5 9 69 6 84 10 26 7 23 10 88 7 92 11 27 8 02 4 10 01 6 90 10 58 7 29 10 98 7 58 11 50 7 82...

Page 19: ...mBtuh Total mBtuh Sensible mBtuh Total mBtuh Sensible mBtuh 13 8 64 5 88 9 05 6 16 9 68 6 59 10 35 7 04 5 9 24 6 38 9 68 6 69 10 46 7 23 11 13 7 69 4 9 37 6 63 9 82 6 96 10 73 7 60 11 35 8 04 0 9 98...

Page 20: ...otal mBtuh Sensible mBtuh 13 14 50 10 01 15 34 10 60 15 84 10 95 16 86 11 65 5 15 50 10 98 16 40 11 62 17 13 12 13 18 12 12 84 4 15 72 10 64 16 64 11 27 17 57 11 89 18 49 12 52 0 16 28 11 85 17 24 12...

Page 21: ...h Total mBtuh Sensible mBtuh 13 18 76 14 06 19 78 14 81 20 90 15 83 22 47 17 19 5 20 06 15 12 21 38 16 13 22 59 16 80 24 16 18 14 4 20 34 14 76 21 94 15 92 23 05 16 73 24 66 18 10 0 21 23 15 30 22 75...

Page 22: ...7 21 09 20 44 19 52 32 22 55 21 59 20 90 20 06 35 23 23 22 24 21 51 20 75 39 2 25 25 24 15 23 36 22 42 44 6 28 28 27 15 26 24 25 32 47 29 63 28 33 27 46 26 36 53 6 30 72 29 39 28 45 27 02 57 31 83 30...

Page 23: ...333 2 3 8 60 3 5 8 92 13 3 4 349 Figure 17 24K Outdoor Unit Dimensions Inches mm 7 5 Outdoor Unit Clearances 7 5 1 Single Units 24 610 Air Outlet Air Inlet 24 610 12 305 79 2007 1 12 305 1 Minimum rea...

Page 24: ...minimum of 10 inches 254 mm If 1 2 the height of the unit A is less than the height of the wall C the distance from the unit to the wall B must be a minimum of 12 inches 305 mm If the height of the w...

Page 25: ...8 2 Single Zone Piping Limitations 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...

Page 26: ...in 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 9 1 Pipe Length Maximum piping length and height difference Table 5 P...

Page 27: ...oad electrical circuit as this may lead to failure and possible fire Use specified wiring and cable to make electrical con nections Clamp cables securely and make sure that connections are tight to av...

Page 28: ...N 16 CN 50 CN 30 CN 29 CN 28 OUTDOOR CONTROL T5 TP T3 T4 Figure 20 9K 115VAC Outdoor Unit Wiring Diagram COMPRESSOR Y G 4 WAY DC FAN CN 7 3 PAN HEATER CN 15 CN 60 CRANKCASE HEATER CN 17 BLUE BROWN YEL...

Page 29: ...K WHTIE OUTDOOR CONTROL T5 T3 T4 Figure 22 09K 12K and 18K 208 230VAC Outdoor Unit Wiring Diagram 4 WAY DC FAN CN 414 3 PAN HEATER CN 19 CN 60 CRANKCASE HEATER CN 16 AMBIENT TEMP SENSOR DISCHARGE TEMP...

Page 30: ...ding Refrigerant if Pipe Length Exceeds Charge Less Pipe Length Connect the charge hose to the charging cylinder and open the two way and three way valves With the charge hose you disconnected from th...

Page 31: ...oximately five minutes after turning off the vacuum pump Turn the flare nut of the three way valves about 45 counterclockwise for six or seven seconds after the gas coming out then tighten the flare n...

Page 32: ...charged with refrigerant Calculate the additional refrigerant required according to the diameter and the length of the liquid pipe between the outdoor unit and indoor unit connections Be sure to add t...

Page 33: ...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 34: ...125 124 120 126 132 155 162 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 16 2 Heating Chart Table 12 Heating Fahrenheit Celsius F...

Page 35: ...29 C 18 C to 29 C 17 C 84 2 F 64 4 F to 84 2 F 62 6 F Modify Rate 100 60 40 When there is more than one indoor unit Outdoor Temperature T4 Cooling 25 C 17 C 25 C 17 C 77 F 62 6 F 77 F 62 6 F Modify Ra...

Page 36: ...9 17 26 25 When low ambient cooling is valid 27 High Low 25 20 15 low ambient cooling Outdoor fan speed control logical low ambient cooling When T4 15 C 59 F and T3 30 C 86 F the unit will enter into...

Page 37: ...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 the hook towards left to open it Horizontal L...

Page 38: ...ep 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 Release the hooks with...

Page 39: ...Rotate the display board in the direction shown in the right picture 17 1 2 Electrical Parts NOTE When handling electrical parts use anti static gloves NOTE Remove the front panel see Step 1 on page 3...

Page 40: ...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 41: ...Sensor RoomTemp Sensor 17 1 3 Evaporator NOTE Remove the front panel and electrical parts see both Front Panel on page 37 and Electrical Parts on page 39 Electrical parts before disassembling evapora...

Page 42: ...Electrical Parts on page 39 Electrical parts and 17 1 3 Evaporator on page 41 before disassembling fan motor and fan Step 1 Remove the two screws and remove the fixing board of the fan motor Screws S...

Page 43: ...clockwise indicated in imagine below Step 2 Pull up the drain hose to remove it 17 2 Outdoor Unit 17 2 1 Panel Plate Some Models Step 1 Turn off the air conditioner and the power breaker Step 2 Remov...

Page 44: ...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 17 2 2 Panel Plate MWHA024S4 Step 1 Turn off the air conditioner a...

Page 45: ...c gloves must be worn when you dissemble the electronic box NOTE Remove the panel plate before disassembly the fan Step 1 Remove the connector for the compressor Step 2 Pull out the two blue wires con...

Page 46: ...late before disassembly the fan Step 1 Remove the connector for the compressor Step 2 Pull out the two blue wires connected to the expansion value not applicable to AC units only Step 3 Pull out conne...

Page 47: ...ontrol board Fan Motor Connector Step 5 Remove the screws securing the fan motor and then remove fan assembly Fan Motor 17 2 7 Fan Disassembly MWHA018S4 Step 1 Remove the nut security the fan to the f...

Page 48: ...he nut security the fan with a spanner Then remove the fan D Cut Step 2 Release the hooks and then open the electronic control box cover Hook Step 3 Disconnect the connector for the fan motor from the...

Page 49: ...before disassembling four way valve Step 1 Heat up the brazed parts and then detach the the four way valve and the pipe Step 2 Remove the four way valve assembly with pliers 17 2 11 Compressor NOTE R...

Page 50: ...50 Step 4 Heat up the brazed parts and then remove the discharge and suctions pipes Step 5 Lift the compressor from the base pan assembly with pliers...

Page 51: ...51...

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