Lennox Merit 13ACD-018 Installation Instructions Manual Download Page 20 | Manualshive

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Summary of Contents for Merit 13ACD-018

Page 1: ...Connections 13 Start Up and Charging Procedures 14 System Operation 18 Maintenance 18 Homeowner Information 19 Start Up and Performance Checklist 20 CAUTION Check the unit for shipping damage and lis...

Page 2: ...able 1 Torque Requirements Part Service valve cap 8 ft lb Sheet metal screws 16 in lb Machine screws 10 28 in lb Compressor bolts 90 in lb Gauge port seal cap 8 ft lb USING MANIFOLD GAUGE SETS Recomme...

Page 3: ...en and use an appropriately sized wrench to turn an additional 1 6 turn clockwise as illustrated in figure 2 1 Remove stem cap with an appropriately sized wrench 2 Use a service wrench with a hex head...

Page 4: ...e stem cap with a wrench 2 Use an appropriately sized wrench to open To open valve rotate stem counterclockwise 90 To close rotate stem clockwise 90 3 Replace the stem cap and tighten as follows With...

Page 5: ...to remove the remaining refrigerant in the system NOTE It may be necessary to bypass the low pressure switches if equipped to ensure complete refrigerant evacuation 3 When the low side system pressure...

Page 6: ...aze connections to the indoor unit coil flare or braze connections Use Lennox L15 braze non flare series line set or use field fabricated refrigerant lines as listed in table 2 Model Table 2 Refrigera...

Page 7: ...R WIRE TIE STRAP THE SUCTION LINE TO THE JOIST OR RAFTER AT 8 FEET INTERVALS THEN STRAP THE LIQUID LINE TO THE SUCTION LINE FLOOR JOIST OR ROOF RAFTER b _ IMPORTANT REFRIGERANT LINES MUST NOT CONTACT...

Page 8: ...valve stem port connection on the liquid line service valve and out of the valve stem port connection on the suction service valve The TXV metering device at the indoor unit coil will allow low press...

Page 9: ...not to twist or damage distributor tubes during this process 4 Remove and discard fixed orifice valve stem assembly if present and Teflon ring as illustrated in figure 15 Page 9 TYPICAL TXV REMOVAL PR...

Page 10: ...umber to order a new or replacement fixed orifice kit The kit includes 1 Fixed orifice 1 Fixed orifice extractor 1 Teflon ring 1 Fixed orifice sticker FIXED ORIFICE 1 FIXED ORIFICE EXTRACTOR 1 TEFLON...

Page 11: ...P _ __FLARE NUT I X COPPER E OR FLARE SEAL BONNET I MALE BRASS EQUALIZER _ LINE FITTING SUCTION LINE Figure 22 Copper Flare Seal Bonnet Removal 7 Connect the equalizer line from the TXV to the equaliz...

Page 12: ...tor 11 Check all joints for leaks 12 Purge dry nitrogen and HFC 410A mixture 505366M 01_8 Page 12 WARNING IMPORTANT Evacuating the system of non condensables is critical for proper operation of the un...

Page 13: ...rons 29 9 inches of mercury within a 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves 9 When the absolute pressure requirement above has been met disconnect th...

Page 14: ...ontrol box Connect conduit to the control box using a proper conduit fitting NOTE See unit wiring diagram for power supply connections If indoor unit is not equipped with blower relay It must be field...

Page 15: ...es recheck temperatures to confirm that the temperature drop and DT are within 3 Figure 27 Checking Indoor Airflow over Evaporator Coil using Delta T Chart WHEN TO CHARGE Warm weather best Can charge...

Page 16: ...essary block outdoor coil to maintain 325 375 psig 9 Record line temperature LIQ o 10 Measure liquid line pressure and use the value to determine saturation temperature SAT o 11 Subtract to determine...

Page 17: ...or ambient air 1 Confirm proper airflow across coil using figure27 2 Compare unit pressures with Table 6 Normal Operating Pressures 3 Use SUPERHEAT to correctly charge unit or to verify the charge is...

Page 18: ...83 320 83 Fixed Orifice RFC 65 18 139 67 147 71 148 65 162 75 158 72 151 71 152 68 70 21 149 70 159 73 161 67 174 76 170 75 161 73 165 71 75 24 161 74 172 75 175 70 187 78 182 76 172 75 178 73 80 27...

Page 19: ...L OPTIONAL ACCESSORIES Refer to the Engineering Handbook for optional accessories that may apply to this unit The following may or may not apply kWARNING IMPORTANT NOTE A white residue may appear on t...

Page 20: ...Lennox system may be controlled by a programmable thermostat These thermostats provide the added feature of programmable time of day setpoints for both heating and cooling Refer to the user s informa...

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