Lennox XC25 Series Manual Download Page 14

Page 14

OUTDOOR CONTROL

4

ROUTE CONTROL WIRES

Maximum length of wiring (18 gauge) for all connections on
the RSBus is 1500 feet (457 meters). Wires should be color-
coded, with a temperature rating of 95

º

F (35

º

C) minimum,

and solid-core (Class II Rated Wiring). All low voltage wiring
must enter unit through provided field-installed busing
installed in electrical inlet.

The icomfort 

Wi-F

i

®

 thermostat requires four thermostat

wires between the thermostat and the furnace / air handler
iComfort™ control and four wires between the outdoor unit
and the furnace/air handler iComfort™ control. When a
thermostat cable with more than four wires is used, the extra
wires must be properly connected to avoid electrical noise
(see below).

Use a wire nut to bundle the four unused wires at each end
of the cable. Each bundle should also include an additional
wire that should be connected on each end to the C terminal
as shown in the figure below.

Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a
cutout is located side panel of the control box. Connect conduit to the control box using a proper conduit fitting.

ROUTE HIGH VOLTAGE AND GROUND WIRES

TYPICAL CONTROL BOX

GROUND LUGS

CONTACTOR

WATERTIGHT FLEX­

IBLE CONDUIT

TO SERVICE

DISCONNECT BOX

ELECTRICAL INLET

(HIGH VOLTAGE)

5

Indoor Control

iComfort 

Wi-Fi

®

thermostat

Single Wire To

C Terminal

Unused Wires

Unused Wires

Single Wire To C Terminal

Outdoor Control

CONTROL WIRING
ROUTE (LOW VOLTAGE)

ELECTRICAL (CONTROL WIRING)

AND LINE SET INLETS USE
BUSHING AND GROMMETS

PROVIDED IN BAG

PROVIDED RAST

6-PIN CONNECTOR

BUSHING

GROMMETS

FIGURE 11

Summary of Contents for XC25 Series

Page 1: ...ATION INSTRUCTIONS Dave Lennox Signature Collection XC25 System AIR CONDITIONERS 507004 01 6 14 2013 Supersedes 6 2013 PACKING LIST OUTDOOR UNIT WARRANTY CARD GROMMETS 2 BUSHING 1 RAST 6 PIN CONNECTOR 1 WARNING Improper installation adjustment alteration service or maintenance can cause property damage personal inju ry or loss of life Installation and service must be performed by a licensed HVAC p...

Page 2: ... WOOD OR PLASTIC SLAB NO PLASTIC ANCHOR HOLE DRILL 1 8 INSTALL UNIT LEVEL OR IF ON A SLOPE MAINTAIN SLOPE TOLERANCE OF 2 DEGREES OR 2 INCHES PER 5 FEET 50 MM PER 1 5 M AWAY FROM BUILDING STRUCTURE MOUNTING SLAB BUILDING STRUCTURE GROUND LEVEL Outside Unit Placement Slab Mounting at Ground Level SAME FASTENERS AS SLAB SIDE MOUNTING IMPORTANT To help stabilize an outdoor unit some installations may ...

Page 3: ...ing this unit carefully stow all removed panels so that the panels will not cause injury to personnel objects or nearby structures Also take care to store panels where they will not be subject to damage e g being bent or scratched While handling or stowing the panels consider any weather conditions especially wind that may cause panels to be blown around and damaged UNIT DIMENSIONS INCHES MM 4 5 8...

Page 4: ...gas such as nitrogen to pressurize a refrigeration or air conditioning system use a regulator that can control the pressure down to 1 or 2 psig 6 9 to 13 8 kPa IMPORTANT Some scroll compressors have an internal vacuum protector that will unload scrolls when suction pres sure goes below 20 psig A hissing sound will be heard when the compressor is running unloaded Protector will reset when low press...

Page 5: ...65 40 40 feet 12 2 m 89J61 L15 65 50 50 feet 15 2 m 89J62 XC25 060 230 XX 3 8 10 mm 1 1 8 29 mm Field fabricated Applicable to all minor revision numbers unless otherwise specified Some applications may required a field provided 1 1 8 to 7 8 adapter Table 2 XC25 Line Set Guidelines Between 51 150 Linear Length Model Maximum Total Equivalent Length ft Maximum Linear actual Length ft Maximum Vapor R...

Page 6: ...he two Teflon rings 8 Use a field provided fitting to temporarily reconnect the liquid line to the indoor unit s liquid line orifice housing LOW HIGH EXISTING INDOOR UNIT GAUGE MANIFOLD CYLINDER CONTAINING CLEAN HCFC 22 TO BE USED FOR FLUSHING Positioned to deliver liquid refrigerant LIQUID LINE SERVICE VALVE INLET DISCHARGE TANK RETURN CLOSED OPENED RECOVERY CYLINDER RECOVERY MACHINE NEW OUTDOOR ...

Page 7: ...ervice port nitrogen flow will have an exit point NITROGEN HIGH LOW B A C PIPING PANEL REMOVAL PREPARING LINE SET CAP AND CORE REMOVAL Remove piping panel to access service valves Cut ends of the refrigerant lines square free from nicks or dents and debur the ends The pipe must remain round Do not crimp end of the line Remove service cap and core from both the suction vapor and liquid line service...

Page 8: ...ated nitrogen at 1 to 2 psig through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the suction vapor valve stem port See steps 3A 3B and 3C on previous page and below for manifold gauge setup 5 SUCTION VAPOR LINE WHEN BRAZING LINE SET TO SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE LIQUID LINE WATER SATURATED CLOTHS WATER SATURATED CLO...

Page 9: ...LATION 1 2 3 4 5 6 7 8 9 10 11 12 1 8 Turn 1 Remove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure below 2 Remove the field provided fitting that temporarily reconnected the liquid line to the indoor unit s distributor assembly INDOOR EXPANSION VALVE INSTALLATION 3 Install one of the provi...

Page 10: ...the cylinder of HFC 410A refrigerant to the center port of the manifold gauge set Open the valve on the HFC 410A cylinder vapor only B Open the high pressure side of the manifold to allow HFC 410A into the line set and indoor unit Weigh in a trace amount of HFC 410A A trace amount is a maximum of two ounces 57 g refriger ant or three pounds 31 kPa pressure Close the valve on the HFC 410A cylinder ...

Page 11: ...p and closing the manifold gauge valves F When the absolute pressure requirement above has been met disconnect the manifold hose from the vacuum pump and connect it to a cylinder of HFC 410A positioned to deliver liquid refrigerant Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit G Perform the following S Close manifold gauge valves S Shut of...

Page 12: ...ake care during unit installation and service to protect the unit s electronic controls Precautions will help to avoid control exposure to electrostatic discharge by putting the unit the control and the technician at the same electrostatic potential Touch hand and all tools on an unpainted unit surface before performing any service procedure to neutralize electrostatic charge Refer to the unit nam...

Page 13: ...inals PUSH BUTTON 7 SEGMENT DISPLAY PUMP DOWN WHEN UNIT IS IN PUMP DOWN MODE Pd WILL BE DISPLAYED ON 7 SEGMENT TO ACTIVATE PUMP DOWN MODE THE CONTROL MUST BE IN THE IDLE STATE AND THE PUMP DOWN JUMPER PLACED ACROSS THE TWO PUMP DOWN PINS TO DEACTIVATE REMOVE JUMPER FIGURE 10 ...

Page 14: ... nut to bundle the four unused wires at each end of the cable Each bundle should also include an additional wire that should be connected on each end to the C terminal as shown in the figure below Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring To facilitate a conduit a cutout is located side panel of the control box Connect conduit to the ...

Page 15: ...ater i e sprinkler systems soakers waste water etc will corrode the surface of steel and aluminum parts diminish performance and affect longevity of the unit Outdoor Coil The outdoor unit must be properly maintained to ensure its proper operation S Please contact your dealer to schedule proper inspec tion and maintenance for your equipment S Make sure no obstructions restrict airflow to the outdoo...

Page 16: ...ture Return Air Temperature HEATING MODE Vapor Pressure Liquid Pressure Supply Air Temperature Ambient Temperature Return Air Temperature System Refrigerant Charge Refer to manufacturer s information on unit or installation instructions for required subcooling and approach temperatures Subcooling A B SUBCOOLING Saturated Condensing Temperature A minus Liquid Line Temperature B Approach A B APPROAC...

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