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Page 3

Setting the Unit

CAUTION

In order to avoid injury, take proper precaution when
lifting heavy objects.

CAUTION

Sharp sheet metal edges can cause injury. When
installing the unit, avoid accidental contact with
sharp edges.

Refer to unit dimensions for sizing mounting slab, plat-
forms or supports. Refer to figure 1 for installation clear-
ances.

36

(914 mm)

Installation Clearances

Figure 1

36*

(914 mm)

*NOTE − A service clearance of 30" (762 mm) must be main-
tained on one of the sides adjacent to the control box. Clear-
ance to one of the other three sides must be 36" (914 mm).
Clearance to one of the remaining two sides may be 12" (304
mm) and the final side may be 6" (152 mm).

36*

(914 mm)

NOTE − A clearance of 24" (610 mm) must be maintained
between two units.
NOTE − 48" (1219 mm) clearance required on top
of unit. Maximum soffit overhang is 36" (914 mm).

36

(914 mm)

Slab Mounting

When installing a unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground will not collect around the unit. See figure 2.
Slab should have a slope tolerance away from the building
of 2 degrees or 2 inches per 5 feet (51 mm per 1524 mm).
Refer to roof mounting section for barrier construction if
unit must face prevailing winter winds.

Slab Mounting At Ground Leve

l

discharge air

Mounting slab must slope
away from building.

ground level

structure

Figure 2

Roof Mounting

Install unit at a minimum of 4 inches above the surface of
the roof. Care must be taken to ensure weight of unit is
properly distributed over roof joists and rafters. Either red-
wood or steel supports are recommended.

Electrical

In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).

Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.

WARNING

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.

 2 − Ground unit at unit disconnect switch or to an earth

ground.

NOTE − To facilitate conduit, a hole is in the bottom of 
the control box. Connect conduit to the control box us
ing a proper conduit fitting.

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 4 for field wiring 
diagram.

NOTE − A complete unit wiring diagram is located in
side the unit control box cover.

 3 − Install room thermostat (ordered separately) on an in-

side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be effected
by sunlight, drafts or vibrations.

 4 − Install low voltage wiring from outdoor to indoor unit

and from thermostat to indoor unit. See figure 3.

Summary of Contents for HSXA12-018

Page 1: ...fied in Lennox Engineering Handbook Coils previously charged with R22 must be flushed INSTALLATION INSTRUCTIONS HSXA12 Series Units CONDENSING UNITS 504 540M 04 04 Supersedes 12 03 Table of Contents H...

Page 2: ...KIT 4 Field Installed 4 3 8 111 6 3 8 162 6 3 8 162 Top View Base Section 2 51 3 4 19 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...

Page 3: ...the surface of the roof Care must be taken to ensure weight of unit is properly distributed over roof joists and rafters Either red wood or steel supports are recommended Electrical In the U S A wiri...

Page 4: ...Outdoor Unit C Outdoor Unit power heat cooling indoor blower common NOTE see unit wiring diagram for power supply connections NOTE If the indoor unit is not equipped with blower relay It must be field...

Page 5: ...ft 50 ft 4 6 m 15 m 042 048 3 8 in 10 mm 7 8 in 22 mm 3 8 in 10 mm 7 8 in 22 mm L15 65 15 ft 50 ft 4 6 m 15 m 060 3 8 in 10 mm 1 1 8 in 29 mm 3 8 in 10 mm 1 1 8 in 29 mm Field Fabricated NOTE Units ar...

Page 6: ...id 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 W...

Page 7: ...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 8: ...ne 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 7 Outsid...

Page 9: ...on device Do not leave the filter drier uncapped for more than 10 to 15 minutes prior to brazing evacuation and leak testing Polyol ester oils used in this system absorb mois ture quickly Failure to i...

Page 10: ...it Set the new R410A unit and follow the brazing connection procedure which begins on the previous page to make line set connections DO NOT install the provided fixed ori fice yet Make low voltage and...

Page 11: ...n instructions and the Lennox Engineering Handbook for approved TXV and fixed orifice match ups and application information Table 1 lists the unit liquid and vapor line sizes and corresponding line se...

Page 12: ...a 5 16 extension for vapor line sizes 3 Replace the stem cap Tighten finger tight then tighten an additional 1 6 turn To Close Service Valve 1 Remove the stem cap with an adjustable wrench 2 Use a se...

Page 13: ...ve on the R410A cylinder and the valve on the high pressure side of the manifold gauge set Disconnect R410A cylinder 4 Connect a cylinder of nitrogen with a pressure regulat ing valve to the center po...

Page 14: ...der of R410A refrigerant Open the manifold gauge valves to break the vacuum from 1 to 2 psig positive pressure in the line set and indoor unit Close manifold gauge valves and shut off the R410A cylind...

Page 15: ...e the necessary load for properly charging the system in the cooling cycle 3 Use a digital thermometer to record the outdoor ambi ent temperature 4 When the heating demand has been satisfied switch th...

Page 16: ...144 565 9 52 147 4 83 246 5 114 385 4 145 572 8 53 150 1 84 250 3 115 390 7 146 579 8 54 152 8 85 254 1 116 396 0 147 586 8 55 155 5 86 258 0 117 401 3 148 593 8 56 158 2 87 262 0 118 406 7 149 601 0...

Page 17: ...in the liquid state Some R410A cylinders are equipped with a dip tube which allows you to draw liquid refrigerant from the bottom of the cylin der without turning the cylinder upside down The cylinder...

Page 18: ...nnect switch es Unit may have multiple power supplies Maintenance and service must be performed by a qualified installer or service agency At the beginning of each cooling season the system should be...

Page 19: ...n Checked Job No City City Serial No Date State State Service Technician Compressor Outdoor Fan Indoor Filter Clean Electrical Connections Tight Supply Voltage Unit Off Vapor Pressure Thermostat Refri...

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