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Summary of Contents for Lennox 10ACC-018
- Page 2 See the thermostat homeowner manual for instruc- • Check the indoor unit filter each month and replace tions on how to operate your thermostat. the filter, if necessary. Have your Lennox dealer show you where your indoor unit filter is located. It Pre-Service Check...
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Page 3: Table Of Contents
......Lennox Merit® 10ACC outdoor units are designed for use in Start−Up & Performance Check List . -
Page 4: Unit Dimensions
Unit Dimensions − inches (mm) 4−3/8 4−3/8 (111) (111) INLET 4−3/8 4−3/8 (111) (111) OPTIONAL UNIT INLET INLET STAND−OFF KIT (4) COMPRESSOR (Field Installed) COIL DRAIN OUTLETS (Around perimeter of base) 6−3/8 4−3/8 VAPOR LINE (162) (111) CONNECTION LIQUID LINE 6−3/8 4−3/8 CONNECTION... -
Page 5: Setting The Unit
erly distributed over roof joists and rafters. Redwood or Setting the Unit steel supports are recommended. CAUTION Electrical In order to avoid injury, take proper precaution when In the U.S.A., wiring must conform with current local codes lifting heavy objects. and the current National Electric Code (NEC). - Page 6 Typical Wiring Field Wiring Diagram *May be optional Figure 2 Thermostat Designations Indoor Unit Thermostat NOTE − see unit wiring diagram for power supply connections. power Outdoor Unit heat Y1 Outdoor Unit cooling indoor blower C Outdoor Unit common NOTE − If the indoor unit is not equipped with blower relay. It must be field−provided and installed (P−8−3251 or equivalent). Figure 3 Page 4...
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Page 7: Refrigerant Piping
(sweat connections) to the indoor coil Installing Refrigerant Line (flare or sweat connections). Use Lennox L15 (sweat, non- During the installation of any heat pump or a/c system, it is flare) series line sets as shown in table 1 or use field-fabri- important to properly isolate the refrigerant lines to prevent cated refrigerant lines. - Page 8 Refrigerant Line Sets How To Install Vertical Runs (new construction shown) NOTE - Similar installation practices should be used if line set is to be installed on exterior of outside wall. IMPORTANT - Refrigerant Outside Wall Vapor Line Liquid Line lines must not contact wall.
- Page 9 Refrigerant Line Sets: Installing Horizontal Runs To hang line set from joist or rafter, use either metal strapping material Wire Tie or anchored heavy nylon wire ties. (around vapor line only) 8 feet Floor Joist or Roof Rafter Tape or Wire Tie 8 feet Strapping Material (around vapor line only) Metal Sleeve...
- Page 10 Refrigerant Line Sets: Transition From Vertical To Horizontal Automotive Anchored Heavy Muffler-Type Nylon Wire Tie Hanger Wall Wall Stud Stud Strap Liquid Line Strap Liquid Line To Vapor Line To Vapor Line Liquid Line Vapor Line Metal Vapor Line Wrapped in Metal Sleeve Liquid Line...
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Page 11: Refrigerant Metering Devices
Expansion valves equipped with Chatleff fittings are avail- tion. Table 1 lists the unit liquid and vapor line sizes and cor- able from Lennox. Refer to the Engineering Handbook for responding line sets. expansion valves for use with specific match−ups. -
Page 12: Service Valves
3 − Replace the stem cap. Tighten finger tight, then tighten Service Valves an additional 1/6 turn. The liquid line and vapor line service valves (figures 9 and Liquid Service Valve 10) and gauge ports are used for leak testing, evacuating, (Valve Closed) charging and checking charge. -
Page 13: Leak Testing
To Close Service Valve: WARNING 1 − Remove the stem cap with an adjustable wrench. Danger of fire. Bleeding the refrigerant 2 − Use a service wrench with a hex−head extension to charge from only the high side may turn the stem clockwise to seat the valve. Tighten the result in the low side shell and suc- stem firmly. -
Page 14: Evacuation
5 − Connect the manifold gauge set high pressure hose to der with pressure regulator set to 150 psig (1034 kPa) the vapor valve service port. (Normally, the high pres- and purge the hose. Open the manifold gauge valves sure hose is connected to the liquid line port; however, to break the vacuum in the line set and indoor unit. -
Page 15: Charging
have consulted the power company and the voltage 5 − The outdoor temperature will determine which charg- condition has been corrected. ing method to use. Proceed with the appropriate charg- ing procedure. 6 − Set the thermostat for a cooling demand. Turn on pow- er to the indoor blower and close the outdoor unit dis- connect switch to start the unit. - Page 16 Table 5 mean that the system is not properly charged or that a 10ACC Subcooling Values problem exists with some component in the system. (Fixed Orifice Systems Only) Pressures higher than those listed indicate that the system is overcharged. Pressures lower than those OUTDOOR LIQUID SUBCOOLING [+ 1_F (.6_C)] TEMP...
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Page 17: System Operation
Table 7 Normal Operating Pressures In psig (liquid and vapor +/− 2 psig)* Out. Coil −018 −024 −030 −036 −042 −048 −060 Unit / Entering Entering Metering Metering Air Temp. Device LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. -
Page 18: Optional Accessories
Compressor Crankcase Heater Optional Accessories Hail Guards Refer to the Engineering Handbook for optional accesso- Mounting Bases ries that may apply to this unit. The following may or may Timed Off Control not apply: Stand−off Kit Loss of Charge Kit Sound Cover High Pressure Switc Kit Low Ambient Kit...
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