Lennox Merit 14HPX-018 Installation Instructions Manual Download Page 1 | Manualshive

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Summary of Contents for Merit 14HPX-018

Page 1: ...System Operation 17 Defrost System 17 Maintenance 22 Optional Accessories 23 Homeowner Information 23 Thermostat Operation 24 14HPX Check List 24 IMPORTANT IMPORTANT 14HPX Merit outdoor units use HFC...

Page 2: ...3 8 111 4 3 8 111 COMPRESSOR VAPOR AND LIQUID LINE CONNECTIONS 2 3 4 70 OPTIONAL UNIT STAND OFF KIT 4 FIELDqNSTALLED m SIDE VIEW 3 4 19 _i SIDE VIEW Model No A B C 14HPX 018 24 1 4 616 29 1 4 743 28...

Page 3: ...se 4 When installed in areas where low ambient tempera tures exist locate unit so winter prevailing winds do not blow directly into outdoor coil 5 Locate unit away from overhanging roof lines which wo...

Page 4: ...NOTE Units are approved for use only with copper conductors 24V Class II circuit connections are made in the low voltage junction box Refer to figure 6 for field wiring diagram NOTE A complete unit w...

Page 5: ...r to the following section that includes flushing procedures Field refrigerant piping consists of liquid and vapor lines from the outdoor unit sweat connections to the indoor coil flare or sweat conne...

Page 6: ...trate procedures which ensure proper refrigerant line set isolation Figure 8 shows how to install line sets on vertical runs Figure 9 shows how to make a transi tion from horizontal to vertical Figure...

Page 7: ...itrogen through the refrigerant piping while making line set connections this prevents carbon de posits oxidation buildup on the inside of the joints be ing brazed Such buildup may restrict refrigeran...

Page 8: ...ons to the new outdoor unit DO NOT turn on power to the unit or open outdoor unit service valves at this time IMPORTANT CAUTION REQUIRED EQUIPMENT You will need the following equipment in order to flu...

Page 9: ...the procedure 9 Close the valve on the inverted HCFC 22 drum and the gauge set valves Pump the remaining refrigerant out of the recovery machine and turn the machine off 10 Use dry nitrogen to break...

Page 10: ...RT 1 Remove service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap and tighten finger tight then tighten per table 1 on pag...

Page 11: ...410A A trace amount is a maximum of 2 ounces 57 g or 3 pounds 31 kPa pressure Close the valve on the HFC 410A cylinder and the valve on the high pressure side of the manifold gauge set Disconnect the...

Page 12: ...p for charging and for determine if charge is needed adjust the charge accord ingly 3 Open the liquid line and vapor line service valves counterclockwise to release refrigerant charge con tained in ou...

Page 13: ...E DISTRIBUTOR _ BIFLO FILTER DRIER OUTDOOR CO L MUFFLER SERV _ COMPRESSOR t NOTE ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW REVERSING VALVE _ APOR LINE VALVE CHECK EXPANSION VALVE NOTE USE GAUGE PO...

Page 14: ...pect minor pressure variations Significant differences may mean improper charge or other system problem Set thermostat for heat cool demand depending on mode being used Using cooling mode When the out...

Page 15: ...11 8 2 5 CH33 44B 13 6 1 7 CH33 48B 13 6 1 8 Target Add Subcooling charge INDOOR MATCHUPS Heat Cool 5OF 1OF Ib oz i El l _iEoZ_ lLo_J_il t 1 _ 1 CR33 88 68C 25 4 1 15 CR33 48B C 25 5 8 9 CX34 49C 13 6...

Page 16: ...51 141 95 35 351 146 361 145 375 145 344 144 349 141 359 145 376 142 100 38 376 147 387 146 397 145 369 146 374 142 384 146 401 143 105 41 402 148 412 147 424 147 394 147 399 143 411 148 426 145 110 3...

Page 17: ...is ignored during defrost operation closes at pressures at or above 55 psig and opens at 25 psig It is not adjustable HIGH PRESSURE SWITCH The 14HPX is equipped with an auto reset high pressure switch...

Page 18: ...onnect to the defrost board through a field re placeable harness assembly that plugs into the board Through the sensors the board detects outdoor ambient coil and discharge temperature fault condition...

Page 19: ...olt power R must be cycled OFF or the TEST pins on board must be shorted between 1 to 2 sec onds to reset the board Defrost Temperature Termination Shunt Jumper Pins The defrost board selections are 5...

Page 20: ...ing mode compressor run time The control will attempt to self calibrate after this and all other defrost cycle s Calibration success depends on stable system tempera tures during the 20 minute calibra...

Page 21: ...ated with defrost timer set for 34 minutes No further test mode operation will be executed until the test short is removed and re applied The controller will check for ambient and coil faults open or...

Page 22: ...or connection to sys tem 1 Remove any blockages or restrictions from coils and or fans Check indoor and outdoor fan motor for proper current draws 2 Check system charge using approach sub cooling tem...

Page 23: ...ers and blocked airflow prevent your unit from operating at its most efficient level 1 Ask your Lennox dealer to show you where your indoor unit s filter is located It will be either at the indoor uni...

Page 24: ...tion The auto mode allows the heat pump to automatically switch from heating mode to cooling mode to maintain pre determined comfort settings Many heat pump thermo stats are also equipped with an eme...

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