Lennox 12HPB Series Installation Instructions Manual Download Page 9

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Page 9

Transitioning From Vertical To Horizontal Runs of Refrigerant Piping

Liquid Line

Vapor Line

Wrapped in

Armaflex

Strap Liquid Line

To Vapor Line

Metal

Sleeve

Anchored Heavy

Nylon Wire Tie

Automotive

Muffler-Type

Hanger

Wall
Stud

Liquid Line

Vapor Line

Wrapped in

Armaflex

Strap Liquid Line

To Vapor Line

Metal

Sleeve

Figure 9

Outside Unit Placement and Installation

Install unit away from windows .

Two 90° elbows
installed in line set
will reduce line set
vibration.

Figure 10

Summary of Contents for 12HPB Series

Page 1: ...4 532M 06 04 Supersedes 04 04 Table of Contents 12HPB Outdoor Units 1 Shipping Packing List 1 General Information 1 Unit Dimensions 2 Setting the Unit 3 Electrical 4 Refrigerant Piping 6 Refrigerant M...

Page 2: ...tion 4 3 8 111 4 3 8 111 4 3 8 111 4 3 8 111 4 3 8 111 compressor coil drain outlets around perimeter of base optional unit stand off kit 4 field installed B C A optional unit stand off kit 4 field in...

Page 3: ...to allow adequate drainage of defrost water and prevent ice buildup 3 In heavy snow areas do not locate the unit where drift ing will occur The unit base should be elevated above the depth of average...

Page 4: ...G Unit must be grounded in accordance with national and local codes Electric Shock Hazard Can cause injury or death 1 Install line voltage power supply to unit from a properly sized disconnect switch...

Page 5: ...power power common common 1st stage aux heat 1st stage aux heat indoor blower compressor Figure 5 R C W1 Y1 O G R C W1 W2 W3 G Outdoor Unit and Blower Unit Thermostat Designations with emergency heat...

Page 6: ...o the compressor Installing Refrigerant Line During the installation of any heat pump or a c system it is important to properly isolate the refrigerant lines to prevent unnecessary vibration Line set...

Page 7: ...Line IMPORTANT Refrigerant lines must not contact structure Outside Wall Inside Wall Liquid Line Vapor Line IMPORTANT Refrigerant lines must not contact wall Wood Block Between Studs Strap Sleeve Woo...

Page 8: ...ire Tie Wire Tie around vapor line only Floor Joist or Roof Rafter Tape or Wire Tie Strap the vapor line to the joist or rafter at 8 ft intervals then strap the liquid line to the vapor line To hang l...

Page 9: ...Line Metal Sleeve Anchored Heavy Nylon Wire Tie Automotive Muffler Type Hanger Wall Stud Wall Stud Liquid Line Vapor Line Wrapped in Armaflex Strap Liquid Line To Vapor Line Metal Sleeve Figure 9 Out...

Page 10: ...d line at the indoor coil Refrigerant Metering Device 12HPB units are used in check expansion valve systems only See the Lennox Engineering Handbook for approved TXV match ups and application informat...

Page 11: ...e wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then an additional 1 6 turn To Open Service Valve 1 Remove stem cap with an adjus...

Page 12: ...r use oxygen to pressurize a refrigera tion or air conditioning system Oxygen will explode on contact with oil and could cause personal injury WARNING Danger of explosion Can cause equipment damage in...

Page 13: ...r port hose from vacuum pump Attach the manifold center port hose to a nitrogen cylin der with pressure regulator set to 150 psig 1034 kPa and purge the hose Open the manifold gauge valves to break th...

Page 14: ...which charg ing method to use Proceed with the appropriate charg ing procedure Weighing in the Charge TXV Systems Outdoor Temp 65 F 18 C If the system is void of refrigerant or if the outdoor ambient...

Page 15: ...erature to check liquid line tempera ture Verify the unit charge using the approach method 5 The difference between the ambient and liquid temper atures should match values given in table 6 If the val...

Page 16: ...ts An amber indicating light simultaneously comes on to remind the homeowner that he is operating in the emergency heat mode Emergency heat is usually used during an outdoor shut down but it should al...

Page 17: ...mode If the jumper is removed before an addi tional 5 second period has elapsed 7 seconds total the unit will remain in defrost mode until the defrost thermostat opens or 14 minutes have passed If th...

Page 18: ...lubrication is needed 3 Adjust blower speed for cooling Measure the pressure drop over the coil to determine the correct blower CFM Refer to the unit information service manual for pressure drop tabl...

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