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Elite XC13

Lennox Elite XC13 Installation Instructions Manual

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Page 1
INSTALLATION
2010 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.
CAUTION
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.
INSTRUCTIONS
Elite® Series XC13 Units
AIR CONDITIONER
506120−01 03/10 Supersedes 07/09
Table of Contents
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
XC13 Air Conditioner Units 1. . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovering Refrigerant from Existing System 4. . . . .
Removing Existing Outdoor Unit 5. . . . . . . . . . . . . . . . .
New Outdoor Unit Installation 5. . . . . . . . . . . . . . . . . . .
Removing and Installing SmartHingePanels 7. . . . .
New or Replacement Line Set 8. . . . . . . . . . . . . . . . . . .
Brazing Connections 10. . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Indoor Unit Metering Device 11. . . . . . . . . . .
Flushing the System 12. . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Metering Device Kits 13. . . . . . . . . . . . . . . .
Installing New Indoor Unit Metering Device 13. . . . . . . .
Leak Testing the System 15. . . . . . . . . . . . . . . . . . . . . . .
Evacuating the System 16. . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections 18. . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Outdoor Unit Delivered Void of Charge 20. . .
Start−Up Procedure 21. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing Charge 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Operation 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Homeowner Information 27. . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist 28. . . . . . . . . . . . .
Shipping and Packing List
Check the unit for shipping damage and listed times below are intact. If damaged, or if parts are missing, immediately contact the last shipping carrier.
1  Assembled outdoor unit. 1  Refrigerant flow control (RFC) kit (Fixed Orifice)
Litho U.S.A.
This unit must be matched with an indoor coil as specified in Lennox XC13 Engineering Handbook. Coils previously charged with HCFC−22 must be flushed.
03/10 506120−01
IMPORTANT
*2P0310* *P506120-01*
XC13 Air Conditioner Units
The XC13 Air Conditioners, which will also be referred to in this instruction as the outdoor unit, uses HFC−410A refrigerant. This outdoor unit must be installed with a matching indoor unit and line set as outlined in the Lennox XC13 Engineering Handbook.
Page 1
Page 2
Unit Dimensions − Inches (mm) and Parts Arrangement
RUN
CAPACITOR
CONTACTOR
DISCHARGE
LINE
FILTER DRIER/
LIQUID LINE
TOP VIEW
C
DISCHARGE AIR
SUCTION LINE CONNECTION
LIQUID LINE CONNECTION
LIQUID LINE CONNECTION
ELECTRICAL INLETS
SUCTION LINE CONNECTION
CONNECTIONS
PARTS ARRANGEMENT
A
OUTDOOR FAN
COMPRESSOR
HIGH PRESSURE SWITCH
SUCTION LINE
SUCTION VALVE AND GAUGE PORT/SUCTION LINE CONNECTIONS
B
2 (51)
UNIT SUPPORT
8−1/2 (216)
8−3/4 (222)
SIDE VIEW
FEET
5−1/2
(140)
13−1/2
(343)
XC13−018, −024, AND −030
BASE SECTIONS
4−1/4 (108)
8−1/4 (210)
9−1/2 (241)
4−3/4 (121)
UNIT SUPPORT
FEET
13−7/8
(352)
7−3/4 (197)
3−1/4
(83)
1 (25)
SIDE VIEW
27−1/8
(689)
XC13−036 TO −060 BASE SECTIONS
WITH ELONGATED LEGS
Model/Capacity A B C
XC13−018 27 (686) 27 (686) 28 (711)
XC13−024 27 (686) 27 (686) 28 (711)
XC13−030 31 (787) 27 (686) 28 (711)
XC13−036 31 (787) 27 (686) 28 (711)
XC13−042 31 (787) 31 (787) 35 (889)
XC13−048 39 (991) 31 (787) 35 (889)
XC13−060 35 (889) 31 (787) 35 (889)
20−5/8
(524)
4−1/2 (114)
3−5/8
(92)
506120−01 03/10
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Page 3
WARNING
This product and/or the indoor unit it is matched with may contain fiberglass wool.
Disturbing the insulation during installation, main­tenance, or repair will expose you to fiberglass wool dust. Breathing this may cause lung cancer. (Fiber­glass wool is known to the State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin, and eye irritation.
To reduce exposure to this substance or for further information, consult material safety data sheets available from address shown below, or contact your supervisor.
Lennox Industries Inc. P.O. Box 799900 Dallas, TX 75379−9900
General Information
These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation.
When servicing or repairing HVAC components, ensure caps and fasteners are appropriately tightened. Table 1 lists torque values for typical service and repair items.
TORQUE OR TIGHTENING REQUIREMENTS
Use a torque wrench and the Table 1 when tighten various components. In the absence of a torque wrench, use figures 1 and 23 for tightening distances.
Table 1. Torque Requirements
Part Recommended Torque
Service valve cap 8 ft.− lb. 11 NM
Sheet metal screws 16 in.− lb. 2 NM
Machine screws #10 28 in.− lb. 3 NM
Compressor bolts 90 in.− lb. 10 NM
Gauge port seal cap 8 ft.− lb. 11 NM
Manifold gauge sets used with HFC−410A refrigerant systems must be capable of handling the higher system operating pressures. The gauges should be rated for use with pressures of 0 − 800 on the high side and a low side of 30" vacuum to 250 psi with dampened speed to 500 psi. Gauge hoses must be rated for use at up to 800 psi of pressure with a 4000 psi burst rating.
OPERATING SERVICE VALVES
The liquid and suction line service valves are used for removing refrigerant, flushing, leak testing, evacuating, checking charge and charging.
Each service valve is equipped with a service port which has a factory−installed valve stem.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc − Rockwell Harness Scale minimum). Fully insert the wrench into the valve stem recess.
Service valve stems are factory−torqued (from 9 ft−lbs for small valves, to 25 ft−lbs for large valves) to prevent refrigerant loss during shipping and handling. Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench, or stripping the valve stem recess.
NOTE − A label with specific tightening requirements may be affixed to the stem cap. If the label is present, use the specified torque stated.
IMPORTANT
To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted snugly over the cap before tightening.
To Access Angle−Type Service Port:
A service port cap protects the service port core from contamination and serves as the primary leak seal.
1/6 TURN
12
11
10
9
8
7
1
2
3
4
5
6
10
9
8
Figure 1. Tightening Distances
USING MANIFOLD GAUGE SETS
When checking the system charge, only use a manifold gauge set that features low loss anti−blow back fittings. See Charging Procedures, step 1 for a typical manifold gauge connection setup.
11
1/12 TURN
12
1
2
3
4
7
5
6
CLOSED TO BOTH
INDOOR AND
OUTDOOR UNITS
FRONT-SEATED
SERVICE PORT CAP
SERVICE PORT
CORE
VALVE STEM
TO INDOOR
UNIT
TO OUTDOOR UNIT
STEM CAP
SERVICE PORT
(VALVE STEM SHOWN CLOSED) INSERT HEX WRENCH HERE
Figure 2. Angle−Type Service Valve
(Font−Seated Closed)
Page 3
XC13 SERIES
Page 4
1. Remove service port cap with an appropriately sized wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap and tighten as follows:
With Torque Wrench: Finger tighten and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional 1/6 turn clockwise as illustrated in figure 1.
To Open and Close Angle−Type Service Valve:
A valve stem cap protects the valve stem from contamination and assures a leak−free seal.
SERVICE PORT CAP
SERVICE PORT
CORE
OPEN TO BOTH
INDOOR AND
OUTDOOR UNITS
TO INDOOR
UNIT
STEM CAP
SERVICE PORT
(VALVE STEM SHOWN OPEN) INSERT HEX WRENCH HERE
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional 1/6 turn clockwise as illustrated in figure 1.
To Open and Close Ball−Type Service Valve:
A valve stem cap protects the valve stem from contamination and assures a leak−free seal.
1. Remove 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 Torque Wrench: Finger tighten and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized to wrench turn an additional 1/12 turn clockwise as illustrated in figure 1.
OPEN TO LINE SET WHEN VALVE IS CLOSED, TO BOTH LINE SET AND UNIT WHEN VALVE IS OPEN.
TO OPEN ROTATE STEM COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM CLOCKWISE 90°.
TO INDOOR UNIT
BALL (SHOWN CLOSED)
VALV E STEM
TO OUTDOOR UNIT
Figure 3. Angle−Type Service Valve
(Back−Seated Opened)
1. Remove stem cap with a wrench.
2. Use a service wrench with a hex−head extension (3/16" for liquid-line valve sizes and 5/16" for suction-line valve sizes) to back the stem out counterclockwise as far as it will go.
3. Replace the stem cap and tighten as follows:
With Torque Wrench: Tighten finger tight and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional 1/12 turn clockwise as illustrated in figure 1.
To Access Ball−Type Service Port:
A service port cap protects the service port core from contamination and serves as the primary leak seal.
1. Remove service port cap with an appropriately sized wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap and tighten as follows:
With Torque Wrench: Finger tighten and then
tighten per table 1.
SERVICE PORT
SERVICE PORT
CORE
SERVICE PORT CAP
TO OUTDOOR UNIT
STEM CAP
Figure 4. Ball−Type Service Valve
Recovering Refrigerant from Existing System
Remove existing refrigerant using one of the following methods:
METHOD 1:
Use this method if the existing outdoor unit is not equipped with manual shut−off valves, and plan on using existing HCFC−22 refrigerant to flush the system.
Perform the following task:
1. Disconnect all power to the existing outdoor unit.
2. Connect to the existing unit a gauge set, clean recovery cylinder and a recovery machine. Use the instructions provided with the recover machine on how to setup the connections.
3. Remove all HCFC−22 refrigerant from the existing system. Check gauges after shutdown to confirm that the entire system is completely void of refrigerant.
506120−01 03/10
Page 4
Page 5
MANIFOLD GAUGES
RECOVERY
MACHINE
CLEAN RECOVERY CYLINDER
OUTDOOR UNIT
Figure 5. Typical Refrigerant Recovery (Method 1)
NOTE − Use recovery machine instructions for specific setup requirements.
METHOD 2:
Use this method if the existing outdoor unit is equipped with manual shut−off valves, and plan on using new HCFC−22 refrigerant to flush the system.
IMPORTANT: Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes, and/or long line sets. The following conditions may cause the compressor to stop functioning:
The following devices could prevent full system charge recovery into the outdoor unit:
Outdoor unit’s high or low−pressure switches (if
applicable) when tripped can cycled the compressor OFF.
Compressor can stop pumping due to tripped internal
pressure relief valve.
you have reached the limitations of the outdoor system. Turn the outdoor unit main power OFF and use a recovery machine 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 pressures reach 0 psig, close the suction line valve.
4. Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.
Removing Existing Outdoor Unit
Perform the following task at the existing outdoor unit:
Disconnect line set at service valves. Disconnect electrical service at disconnect switch. Remove old outdoor unit.
New Outdoor Unit Installation
See Unit Dimensions on page 2 for sizing mounting slab, platforms or supports.
INSTALLATION CLEARANCES
Refer to figure 6 for mandatory installation clearance requirements.
*
*
*
Compressor has internal vacuum protection that is
designed to unload the scrolls (compressor stops pumping) when the pressure ratio meets a certain value or when the suction pressure is as high as 20 psig. (Compressor suction pressures should never be allowed to go into a vacuum. Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips, drive bearings and internal seals).
Once the compressor can not pump down to a lower pressure due to one of the above system conditions, shut off the suction valve. Turn OFF the main power to unit and use a recovery machine to recover any refrigerant left in the indoor coil and line set.
Perform the following task:
1. Start the existing HCFC−22 system in the cooling mode and close the liquid line valve.
2. Pump as much of the existing HCFC−22 refrigerant with the compressor back into the outdoor unit until
* SEE NOTES BELOW THIS FIGURE FOR FURTHER DETAILS.
*
Figure 6. Installation Clearances
NOTES:
Service clearance of 30 in. (762 mm) must be
maintained on one of the sides adjacent to the control box.
Clearance to one of the other three sides must be 36
in. (914 mm)
.
Clearance to one of the remaining two sides may be
12 in. (305 mm) and the final side may be 6 in. (152
.
mm)
48 in. (1219 mm) clearance required on top of unit. A clearance of 24 in. (610 mm) must be maintained
between two units.
Page 5
XC13 SERIES
Page 6
POSITIONING CONSIDERATIONS
CAUTION
In order to avoid injury, take proper precaution when lifting heavy objects.
Consider the following when positioning the unit:
Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent property, not from the installation property. Install the unit as far as possible from the property line.
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound transmission. For proper placement of unit in relation to a window see the provided illustration in figure 7.
INSTALL UNIT
AWAY FROM WIN-
DOWS
NOTE − If necessary for small base unit stability, anchor unit to slab as described in Stabilizing Small Base Unit on Uneven Surfaces.
ELEVATING AND STABILIZING SMALL−BASE UNIT
Use the following instructions to elevate and stabilize the small base units with the round support feet.
Elevating Small−Base Unit
If additional elevation is necessary, raise the unit by extending the length of the unit support feet. This may be done by cutting four equal true−cut lengths of Schedule (SCH) 40, 4" (101.6mm) piping to the height required as illustrated in figure 9.
BASE
TWO 90° ELBOWS
INSTALLED IN LINE SET
WILL REDUCE LINE SET
VIBRATION.
Figure 7. Outside Unit Placement
PLACING OUTDOOR UNIT ON SLAB
When installing unit at grade level, the top of the slab should be high enough above grade so that water from higher ground will not collect around the unit. The slab should have a slope tolerance as described in figure 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.
BUILDING
STRUCTURE
MOUNTING SLAB
GROUND LEVEL
Figure 8. Slab Mounting at Ground Level
LEG DETAIL
4" (101.6MM) SCH 40 PIPING
Figure 9. Elevated Slab Mounting using Feet
Extenders (Small−Base Units)
NOTE − Keep the height of extenders short enough to ensure a sturdy installation. If it is necessary to extend further, consider a different type of field−fabricated framework that is sturdy enough for greater heights.
The inside diameter of the 4" (101.6mm) piping is approximately 0.25" (6.35mm) greater than the pre−installed feet on the unit. Devise a shim that will take up the space and hold the extenders onto the feet during this procedure. Small strips of 0.125" (3.175mm) thick adhesive foam may be used. One or two small 1" (25.4mm) square strips should be adequate to hold the extender in place.
Stabilizing Small−Base Unit on Uneven Surfaces
To help stabilize an outdoor unit, some installations may require strapping the unit to the pad using brackets and anchors commonly available in the marketplace.
506120−01 03/10
Page 6
Page 7
With unit positioned at installation site, remove two side louvered panels to expose the unit base pan.
Install the
brackets as illustrated in figure 10 using conventional practices; replace the panels after installation is complete.
Slab Side Mounting
#10 1/2" LONG SELF−
DRILLING SHEET
METAL SCREWS
STABILIZING
BRACKET (18 GAUGE
METAL − 2" WIDTH;
HEIGHT AS REQ’D)
#10 1−1/4" LONG
HEX HD SCREW
AND FLATWASHER
COIL
BASE PAN
CORNER POST
LEG DETAIL
BASE
2" (50.8MM) SCH 40 FEMALE THREADED ADAPTER
CONCRETE SLAB − USE PLASTIC PLASTIC ANCHOR (HOLE DRILL 1/4")PLASTIC SLAB − NO PLASTIC ANCHOR (HOLE DRILL 1/8")
Deck Top Mounting
STABILIZING BRACKET (18 GAUGE METAL − 2" WIDTH; HEIGHT AS REQ’D); BEND TO FORM RIGHT ANGLE
ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY, 2 BRACKETS PER SIDE, 2" FROM EACH CORNER.
MINIMUM 1 PER SIDE
FOR EXTRA
STABILITY
Figure 10. Installing Stabilizer Brackets
IMPORTANT
Unit Stabilizer Bracket Use (field−provided):
Always use stabilizers when unit is raised above the factory height. (Elevated units could become unstable in gusty wind conditions).
Stabilizers may be used on factory height units when mounted on unstable an uneven surface.
ELEVATING LARGER−BASE UNITS
Unlike the small−base units which use round support feet, the larger−base units are outfitted with elongated support feet as illustrated in figure 11 which uses a similar method for elevating the unit.
If additional elevation is necessary, raise the unit by extending the length of the unit support feet. This may be achieved by using a 2" SCH 40 female threaded adapter.
The specified coupling will fit snuggly into the recessed portion of the feet. Use additional 2" SCH 40 male threaded adaptors which can be threaded into the female threaded adaptors to make additional adjustments to the level of the unit.
NOTE − Keep the height of extenders short enough to ensure a sturdy installation. If it is necessary to extend further, consider a different type of field−fabricated framework that is sturdy enough for greater heights.
Figure 11. Elevated Slab Mounting using Feet
Extenders (Larger Base Units)
ROOF MOUNTING OF OUTDOOR UNIT
Install unit at a minimum of four 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 redwood, steel supports, or roofed in equipment platform is recommended.
Removing and Installing SmartHingetPanels
CAUTION
To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:
While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause panels to be blown around and battered.
REMOVING PANELS
Remove the louvered panels as follows:
1. Remove two screws, allowing the panel to swing open slightly as illustrated in figure 12.
NOTE − Hold the panel firmly throughout this procedure
2. Rotate bottom corner of panel away from hinge corner post until lower three tabs clear the slots as illustrated in figure 12, detail B.
3. Move panel down until lip of upper tab clears the top slot in corner post as illustrated in figure 12, detail A.
INSTALLING PANELS
Install the louvered panels as follows:
1. Position the panel almost parallel with the unit as illustrated in figure 13, detail D with the screw side as close to the unit as possible.
Page 7
XC13 SERIES
Page 8
2. With a continuous motion slightly rotate and guide the lip of top tab inward as illustrated in figure 12, details A and C, then upward into the top slot of the hinge corner post.
3. Rotate panel to vertical to fully engage all tabs.
4. Holding the panel’s hinged side firmly in place, close the right−hand side of the panel, aligning the screw holes.
IMPORTANT! Do not allow panels to hang on unit by top tab. Tab is for alignment and not designed to support weight of panel.
Panel shown slightly rotated to allow top tab to exit (or enter) top slot for removing (or installing) panel.
SCREW
LIP
DETAIL A
HOLES
5. When panel is correctly positioned and aligned, insert the screws and tighten.
New or Replacement Line Set
This section provides information on installation or replacement of existing line set. If line set are not being installed then proceed to Brazing Connections on page 10.
If refrigerant lines are routed through a wall, seal and isolate the opening so vibration is not transmitted to the building. Pay close attention to line set isolation during installation of any HVAC system. When properly isolated from building structures (walls, ceilings. floors), the refrigerant lines will not create unnecessary vibration and subsequent sounds. Also, consider the following when placing and installing a high−efficiency air conditioner.
REFRIGERANT LINE SET
Field refrigerant piping consists of liquid and suction lines from the outdoor unit (braze connections) to the indoor unit coil (flare or sweat connections). Use Lennox L15 (sweat, non−flare) series line set, or use field−fabricated refrigerant lines as listed in table 2.
DETAIL B
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE
PANEL
Detail C
Figure 12. Removing/Installing SmartHinget Panels
(Details A, B and C)
Maintain minimum panel angle (as close to parallel with the unit as possible) while installing panel.
ANGLE MAY BE TOO EXTREME
PREFERRED ANGLE FOR INSTALLATION
HOLD DOOR FIRMLY TO THE HINGED
SIDE TO MAINTAIN
FULLY−ENGAGED TABS
Figure 13. Removing/Installing SmartHinget Panels
(Detail D)
506120−01 03/10
Table 2. Refrigerant Line Set
XC13
−018
−024
−030
−036
−042
−048
−060
Valve Field Connections
Liquid
Line
3/8 in. (10 mm)
3/8 in. (10 mm)
3/8 in. (10 mm)
3/4 in. (19 mm)
7/8 in (22 mm)
1−1/8 in. (29 mm)
Suction
Line
Recommended Line Set
Liquid
Line
3/8 in (10 mm)
3/8 in. (10 mm)
3/8 in. (10 mm)
Suction
Line
3/4 in. (19 mm)
7/8in (22 mm)
1−1/8 in. (29 mm)
NOTE − When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, or contact Lennox Technical Support Product Applications for assistance. To obtain the correct information from Lennox, be sure to communicate the following points:
Model (XC13) and size of unit (e.g. −060).
Line set diameters for the unit being installed as listed
in table 2 and total length of installation.
Number of elbows and if there is a rise or drop of the
piping.
MATCHING WITH NEW OR EXISTING INDOOR COIL AND LINE SET
The RFC1−metering line consisted of a small bore copper line that ran from condenser to evaporator coil. Refrigerant was metered into the evaporator by utilizing temperature/pressure evaporation effects on refrigerant in the small RFC line. The length and bore of the RFC line corresponded to the size of cooling unit.
Page 8
L15
Line Sets
L15−41 15 ft. − 50 ft. (4.6 m − 15 m)
L15−65 15 ft. − 50 ft. (4.6 m − 15 m)
Field Fabricated
Page 9
If the XC13 is being used with either a new or existing indoor coil which is equipped with a liquid line which served as a metering device (RFCI), the liquid line must be replaced prior to the installation of the XC13 unit. Typically a liquid line used to meter flow is 1/4" in diameter and copper.
INSTALLING LINE SET Line Set IsolationThis reference illustrates
procedures, which ensure proper refrigerant line set isolation:
Installation of line set on horizontal runs is
illustrated in figure 14.
Installation of line set on vertical runs is illustrated in
figure 15.
Installation of transition from vertical to horizontal
is illustrated in figure 16.
IMPORTANT - REFRIGERANT LINES
OUTSIDE WALL
WOOD BLOCK
BETWEEN STUDS
NOTE − SIMILAR INSTALLATION PRACTICES SHOULD BE USED IF LINE SET IS TO BE INSTALLED ON EXTERIOR OF OUTSIDE WALL.
MUST NOT CONTACT WALL.
SUCTION LINE
LIQUID LINE
WIRE TIE
INSIDE WALL
STRAP
SLEEVE
WIRE TIE
WOOD BLOCK
WIRE TIE
STRAP
TO HANG LINE SET FROM JOIST OR RAFTER, USE EITHER METAL STRAPPING MATERIAL OR ANCHORED HEAVY NYLON WIRE TIES.
STRAPPING MATERIAL
(AROUND SUCTION
LINE ONLY)
TAPE OR WIRE TIE
FLOOR JOIST OR
ROOF RAFTER
8 FEET
FLOOR JOIST OR
ROOF RAFTER
METAL
SLEEVE
8 FEET
STRAP THE SUCTION LINE TO THE JOIST OR RAFTER AT 8 FEET INTERVALS THEN STRAP THE LIQUID LINE TO THE SUCTION LINE.
Figure 14. Refrigerant Line Set: Installing
Horizontal Runs
AUTOMOTIVE MUFFLER-TYPE
HANGER
WIRE TIE (AROUND SUCTION LINE ONLY)
TAPE OR WIRE TIE
SLEEVE
SUCTION LINE WRAPPED
WITH ARMAFLEX
LIQUID LINE
OUTSIDE
WALL
PVC
PIPE
FIBERGLASS
INSULATION
CAULK
IMPORTANT! REFRIGERANT LINES MUST NOT CONTACT
STRUCTURE.
Figure 15. Refrigerant Line Set: Installing Vertical
Runs (New Construction Shown)
ANCHORED HEAVY
NYLON WIRE TIE
METAL SLEEVE
SUCTION LINE − WRAPPED IN ARMAFLEX
Figure 16. Refrigerant Line Set: Transition from Vertical to Horizontal
STRAP LIQUID LINE TO SUCTION LINE
LIQUID LINE
Page 9
WALL STUD
METAL SLEEVE
STRAP LIQUID LINE TO SUCTION LINE
LIQUID LINE
SUCTION LINE − WRAPPED IN ARMAFLEX
XC13 SERIES
Page 10
Brazing Connections
WARNING
Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections.
WARNING
Danger of fire. Bleeding the refrigerant charge from only the high side may result in the low side shell and suction tubing being pressurized. Application of a brazing torch while pressurized may result in ignition of the refrigerant and oil mixture − check the high and low pressures before unbrazing.
1
CUT AND DEBUR
WARNING
When using a high pressure gas such as dry 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).
CAUTION
Brazing alloys and flux contain materials which are hazardous to your health.
Avoid breathing vapors or fumes from brazing operations. Perform operations only in well ventilated areas.
Wear gloves and protective goggles or face shield to protect against burns.
Wash hands with soap and water after handling brazing alloys and flux.
2
CAP AND CORE REMOVAL
Cut ends of the refrigerant lines square (free from nicks or dents). Debur the ends. The pipe must remain round, do not pinch end of the line.
ATTACHED GAUGES
3
A Connect gauge set low pressure side to liquid line service valve.
B Connect gauge set center port to bottle of nitrogen.
SERVICE PORT MUST BE
OPEN TO ALLOW EXIT
POINT FOR NITROGEN
SUCTION LINE
INDOOR UNIT
LIQUID LINE
Remove service cap and core from both the suction and liquid line service ports.
NITROGEN
ATTACH
GAUGES
SUCTION LINE
SERVICE
VALVE
LIQUID LINE
SERVICE
VALVE
A
OUTDOOR
UNIT
B
506120−01 03/10
Page 10
Page 11
WRAP SERVICE VALVE
4
To protect components during brazing, wrap a wet cloth around the liquid line service valve body and copper tube stub and use another wet cloth underneath the valve body to protect the base paint. Also, shield the light maroon R−410A sticker.
FLOW
5
NITROGEN
FLOW
NITROGEN
NOTE − The fixed orifice or TXV metering device at the indoor unit will allow low pressure nitrogen to flow through the system.
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid line service valve and out of the valve stem port connection on the suction service valve.
6
BRAZE LINE SET
Braze the liquid line to the liquid line service valve. Turn off nitrogen flow.
IMPORTANT − Repeat procedure starting at paragraph 4 for brazing the suction line to service port valve.
Removing Indoor Unit Metering Device
Remove the existing HCFC−22 fixed orifice or TXV from the indoor coil. The existing indoor unit HCFC−22 metering device is not approved for use with HFC−410A refrigerant and may prevent proper flushing.
REPLACEMENT PARTS
If replacement liquid line parts are necessary for the indoor unit, order kit 69J46 (LB−95325A). The kit includes:
7
INSTALL SERVICE PORT CAPS ONLY
SERVICE PORT CORE
SERVICE PORT
SERVICE PORT
After all connections have been brazed, disconnect manifold gauge set from service ports, cool down piping with wet rag and remove all wrappings. Do not reinstall cores until after evacuation procedure. Reinstall service caps if desired to close off refrigerant ports.
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
TEFLON RING
(Uncased Coil Shown)
FIXED ORIFICE
CAP
BRASS NUT
LIQUID LINE ORIFICE HOUSINGS (10)
TEFLON RINGS (20)
LIQUID LINE ASSEMBLIES
(INCLUDES STRAINER) (10)
BRASS NUTS (10)
Figure 17. Liquid Line Kit Components
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
Use the following procedure to remove the indoor unit’s fixed orifice and install a temporary field provided fitting.
LIQUID LINE
ASSEMBLY
PISTON RETAINER
STRAINER
COPPER TUBE
Page 11
DISTRIBUTOR
ASSEMBLY
REMOVE AND
DISCARD
WHITE TEFLON SEAL
(IF PRESENT)
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
Figure 18. Typical Fixed Orifice Removal
1. On fully cased coils, remove the coil access and plumbing panels.
2. Remove any shipping clamps holding the liquid line and distributor assembly.
3. Using two wrenches, disconnect liquid line from liquid line orifice housing. Take care not to twist or damage distributor tubes during this process.
XC13 SERIES
Page 12
4. Remove and discard fixed orifice, valve stem assembly if present and Teflon ring as illustrated in figure 18.
5. Use a field−provided fitting to temporary reconnect the liquid line to the indoor unit’s liquid line orifice housing.
TYPICAL TXV REMOVAL PROCEDURE
Use the following procedure to remove the indoor unit’s TXV and install a temporary field provided fitting.
(Uncased Coil Shown)
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
DISTRIBUTOR
TUBES
LIQUID LINE
ORIFICE
HOUSING
STUB END
TXV
TEFLON
RING
Flushing the System
If the original system used:
HCFC−22 refrigerant, then flush the system using the
procedure provided in this section.
HFC−410A refrigerant, then proceed to Refrigerant
Metering Device Kits.
IMPORTANT
The line set and indoor unit coil must be flushed with at least the same amount of clean refrigerant that previously charged the system. Check the charge in the flushing cylinder before proceeding.
IMPORTANT
TEFLON
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
EQUALIZER LINE
SENSING
BULB
RING
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
SENSING
LINE
LIQUID
LINE
Figure 19. Typical TXV Removal
1. On fully cased coils, remove the coil access and plumbing panels.
2. Remove any shipping clamps holding the liquid line and distributor assembly.
3. Disconnect the equalizer line from the TXV equalizer line fitting on the suction line.
4. Remove the suction line sensing bulb as illustrated in figure 19.
5. Disconnect the liquid line from the TXV at the liquid line assembly.
If this unit is being matched with an approved line set or indoor unit coil which was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC−410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device, and reduce the system performance and capacity.
Failure to properly flush the system per the instructions below will void the warranty.
IMPORTANT
The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants during maintenance, service, repair and disposal of appliance. Approved methods of recovery, recycling or reclaiming must be followed.
CAUTION
This procedure should not be performed on systems which contain contaminants (Example: compressor burn out).
6. Disconnect the TXV from the liquid line orifice housing. Take care not to twist or damage distributor tubes during this process.
7. Remove and discard TXV and the two Teflon rings as illustrated in figure 19.
8. Use a field−provided fitting to temporary reconnect the liquid line to the indoor unit’s liquid line orifice housing.
506120−01 03/10
REQUIRED EQUIPMENT
Equipment required to flush the existing line set and indoor unit coil:
Two clean HCFC−22 recovery bottles, Oilless recovery machine with pump-down feature, Two gauge sets (one for HCFC−22; one for
HFC−410A).
Page 12
Page 13
LOW
GAUGE
MANIFOLD
HIGH
PRESSURE
INVERTED HCFC−22 CYLINDER CONTAINS CLEAN HCFC−22 TO BE USED FOR FLUSHING.
PRESSURE
A
SUCTION LINE
SERVICE VALVE
EXISTING
INDOOR
UNIT
LIQUID LINE SERVICE VALVE
RECOVERY
CYLINDER
SUCTION
LIQUID
D
A Inverted HCFC−22 cylinder with clean refrigerant to the
suction service valve.
B HCFC−22 gauge set (low side) to the liquid line valve. C HCFC−22 gauge set center port to inlet on the recovery
machine. with an empty recovery tank to the gauge set.
D Connect recovery tank to recovery machines per machine
instructions.
NOTE − The inverted HCFC−22 cylinder must contain at least the same amount of refrigerant as was recovered from the existing system.
NEW
OUTDOOR
UNIT
B
C
OPENED
TANK RETURN
INLET
DISCHARGE
RECOVERY MACHINE
CLOSED
Thermal expansion valve (TXV) RFC (Fixed orifice)
See the XC14 Engineering Handbook for approved indoor/outdoor match−ups, applicable refrigerant metering device kits and application information.
FIXED ORIFICE KITS
The indoor unit fixed orifice kit (included with outdoor unit) contains the following parts:
FIXED ORIFICE (1)
FIXED ORIFICE EXTRACTOR (1)
TEFLON RING (1)
FIXED ORIFICE STICKER (1)
Figure 20. Typical Flushing Connection
NOTE − Use recovery machine instructions for specific setup requirements.
PROCEDURE
1. Set the recovery machine for liquid recovery and start the recovery machine. Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and indoor unit coil.
2. Invert the cylinder of clean HCFC−22 and open its valve to allow liquid refrigerant to flow into the system through the suction line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor unit coil before it enters the recovery machine.
3. After all of the liquid refrigerant has been recovered, switch the recovery machine to suction recovery so that all of the HCFC−22 suction is recovered. Allow the recovery machine to pull a vacuum on the system.
4. Close the valve on the inverted HCFC−22 drum and the gauge set valves. Pump the remaining refrigerant out of the recovery machine and turn the machine off.
5. Use dry nitrogen to break the vacuum on the refrigerant lines and indoor unit coil before removing the recovery machine, gauges and refrigerant drum.
Refrigerant Metering Device Kits
This outdoor unit is designed for use in systems that use one of the following refrigerant metering devices:
Figure 21. Fixed Orifice Kit Components
TXV KITS
The indoor unit TXV kit (ordered separately) includes the following parts:
TXV (1)
HEX HEAD BOLTS
AND NUTS (2)
TEFLON RINGS (2)
COPPER
MOUNTING
STRAP (1)
Figure 22. TXV Kit Components
Installing New Indoor Unit Metering Device
XC13 units can be configured for use in with either a HFC−410A fixed orifice or TXV metering devices. This section provides instructions on installing either a fixed orifice or TXV refrigerant metering device.
Page 13
XC13 SERIES
Page 14
TIGHTENING DISTANCES
Use figure 23 to tighten fasteners and caps when a torque wrench is not available.
To prevent any possibility of water damage, properly insulate all parts of the TXV assembly that may sweat due to temperature differences between the valve and its surrounding ambient temperatures.
9
10
8
11
1/8 TURN
10
8
11
12
7
6
12
1
2
3
9
4
7
5
6
1/2 TURN
1
2
3
4
5
Figure 23. Tightening Distances
TYPICAL FIXED ORIFICE INSTALLATION PROCEDURE
Use the following procedure along with figure 24 to install a fixed orifice kit.
LIQUID LINE ORIFICE HOUSING
(Uncased
Coil Shown)
FIXED
ORIFICE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
TEFLON
RING
NYLON
SEAT
LIQUID
LINE
Figure 24. Typical Fixed Orifice Installation
1. Remove the field−provided fitting that temporary reconnected the liquid line to the indoor unit’s liquid line orifice housing.
2. Ensure that the fixed orifice supplied with the outdoor unit is installed with the nylon seat pointing toward the distributor assembly.
3. Apply a small amount of refrigerant oil on the Teflon ring and insert the Teflon ring securely into the orifice housing.
4. Attached the liquid line assembly to the liquid line orifice housing. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in figure 23, or 20 ft−lb.
5. Place the supplied fixed orifice sticker on the indoor cabinet after installation.
TYPICAL TXV INSTALLATION PROCEDURE
The TXV unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed in a field−provided plenum, install the TXV in a manner that will provide access for field servicing of the TXV. Refer to Figure 25 for reference during installation of TXV unit.
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE FITTING (SEE FIGURE 27 FOR FURTHER DETAILS)
SENSING BULB INSULATION IS REQUIRED IF MOUNTED EXTERNAL TO THE COIL CASING. SEE FIGURE 26 FOR BULB POSITIONING.
(Uncased Coil Shown)
LIQUID LINE
ORIFICE
HOUSING
EQUALIZER LINE
STUB END
TXV
TEFLON RING
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
TEFLON RING
SENSING
LINE
LIQUID
LINE
Figure 25. Typical TXV Installation
1. Remove the field−provided fitting that temporary reconnected the liquid line to the indoor unit’s distributor assembly.
2. Install one of the provided Teflon rings around the stubbed end of the TXV and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil.
3. Attach the stubbed end of the TXV to the liquid line orifice housing. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in figure 23, or 20 ft−lb.
4. Place the remaining Teflon ring around the other end of the TXV. Lightly lubricate connector threads and expose surface of the Teflon ring with refrigerant oil.
5. Attach the liquid line assembly to the TXV. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in figure 23, or 20 ft−lb.
6. Attach the suction line sensing bulb in the proper orientation as illustrated in figure 26 using the clamp and screws provided.
NOTE − Insulating the sensing bulb once installed may be required when the bulb location is external to the coil casing.
506120−01 03/10
Page 14
Page 15
SUCTION LINE
BULB
ON LINES SMALLER THAN 7/8", MOUNT SENSING BULB AT EITHER THE 3 OR 9 O’CLOCK POSITION.
12
BULB
Leak Testing the System
After the line set has been connected to both the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks:
SUCTION LINE
12
BULB
NOTE − Never mount on bottom of line.
ON 7/8" AND LARGER LINES, MOUNT SENSING BULB AT EITHER THE 4 OR 8 O’CLOCK POSITION. NEVER MOUNT ON BOTTOM OF LINE.
BULB
Figure 26. TXV Sensing Bulb Installation
7. Remove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the suction line as illustrated in figure 27.
IMPORTANT
When removing the flare nut, ensure that the copper flare seal bonnet is removed.
FLARE SEAL
CAP
OR
MALE BRASS EQUALIZER
Figure 27. Copper Flare Seal Bonnet Removal
8. Connect the equalizer line from the TXV to the equalizer suction port on the suction line. Finger tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated in figure 23.
See the XC13 Engineering Handbook for approved TXV indoor/outdoor unit match−ups and application information. Figure 22 illustrates the kit components and quantities.
FLARE NUT
COPPER
FLARE SEAL
BONNET
LINE FITTING
SUCTION LINE
IMPORTANT
Leak detector must be capable of sensing HFC refrigerant.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.
Failure to follow this warning may result in personal injury or death.
WARNING
Fire, Explosion and Personal Safety Hazard.
Failure to follow this warning could result in damage, personal injury or death.
Never use oxygen to pressurize or purge refrigeration lines. Oxygen, when exposed to a spark or open flame, can cause damage by fire and/ or an explosion, that could result in personal injury or death.
1. Connect an HFC−410A manifold gauge set as illustrated in figure 28.
2. Open the valve on the HFC−410A cylinder (suction only).
3. 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) refrigerant or three pounds (31 kPa) pressure].
4. Close the valve on the HFC−410A cylinder and the valve on the high pressure side of the manifold gauge set.
5. Disconnect the HFC−410A cylinder.
Page 15
XC13 SERIES
Page 16
A Connect an HFC−410A manifold gauge set high pressure hose to the
suction valve service port.
B With both manifold valves closed, connect the cylinder of HFC−410A
refrigerant to the center port of the manifold gauge set. Note: Later in the procedure, the HFC−410A container will be replace by the nitrogen container.
NOTE − Normally, the high pressure hose is connected to the liquid line port; however, connecting it to the suction port better protects the manifold gauge set from high pressure damage.
NITROGEN
MANIFOLD
GAUGE SET
OUTDOOR UNIT
Figure 28. Typical Leak Testing Manifold Gauge Set Connections
6. Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
7. Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit.
8. After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector.
NOTE − Amounts of refrigerant will vary with line lengths.
9. Check all joints for leaks.
10. Purge dry nitrogen and HFC−410A mixture.
11. Correct any leaks and recheck.
12. After leak testing disconnect gauges from service ports.
Evacuating the System
WARNING
Danger of Equipment Damage. Avoid deep vacuum operation. Do not use compressors to evacuate a system. Extremely low vacuums can cause internal arcing and compressor failure. Damage caused by deep vacuum operation will void warranty.
IMPORTANT
A
HFC−410A
B
TO SUCTION
SERVICE VALVE
Evacuating the system of non−condensables is critical for proper operation of the unit. Non−condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non−condensables and water suction combine with refrigerant to produce substances that corrode copper piping and compressor parts.
NOTE − Remove cores from service valves if not already done.
1. Connect an HFC−410A manifold gauge set as illustrated in figure 29.
2. Open both manifold valves and start the vacuum pump.
3. Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
NOTE − During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in pressure this indicates a relatively large leak. If this occurs, repeat the leak testing procedure.
NOTE − The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
4. When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), close the manifold gauge valves, turn off the vacuum pump and disconnect the manifold gauge center port hose from vacuum pump. Attach the manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose. Open the manifold gauge valves to break the vacuum in the line set and indoor unit. Close the manifold gauge valves.
506120−01 03/10
Page 16
Page 17
NOTE − Remove cores from service valves if not already done.
A34000 1/4 SAE
OUTDOOR UNIT
A
TEE WITH
SWIVEL
COUPLER
MICRON GAUGE
50
C
B
NITROGEN
TO SUCTION
SERVICE VALVE
MANIFOLD
GAUGE SET
TO LIQUID
LINE SERVICE
VALV E
D
A Connect low side of manifold gauge set with 1/4 SAE in−line tee to suction line
HFC−410A
VACUUM PUMP
Figure 29. Typical Evacuation Manifold and Micron Gauges Connections
5. Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release dry nitrogen from the line set and indoor unit.
6. Reconnect the manifold gauge to vacuum pump, turn pump on, and continue to evacuate line set and indoor unit until the absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20−minute period after shutting off vacuum pump and closing the manifold gauge valves.
7. When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an upright cylinder of
B Connect high side of manifold gauge set to liquid line service valve C Connect micron gauge available connector on the 1/4 SAE in−line tee. D Connect the vacuum pump (with vacuum gauge) to the center port of the
RECOMMEND MINIMUM 3/8" HOSE
service valve
manifold gauge set. The center port line will be used later for both the HFC−410A and nitrogen containers.
HFC−410A refrigerant. Open the manifold gauge valve pressure line set to break vacuum with 2 to 5 psi.
8. Perform the following:
A Close manifold gauge valves B Shut off HFC−410A cylinder C Reinstall service valve cores by removing
manifold hose from service valve. Quickly install cores with core tool while maintaining a positive system pressure.
D Replace the stem caps and secure finger tight,
then tighten an additional one−sixth (1/6) of a turn as illustrated in figure 1.
Page 17
XC13 SERIES
Page 18
Electrical Connections
In the United States, 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).
TRANSFORMER − 24VAC
Use the transformer provided with the furnace or coil blower for low-voltage control power (24 − 40VAC minimum)
NOTE − The addition of accessories to the system could exceed the 40VAC power requirement of the factory-provided transformer. Measure the system’s current and voltage after installation is complete to determine transformer loading. If loading exceeds the factory-provided transformer capacity, a larger field-provided transformer will need to be installed in the system.
1
CIRCUIT SIZING AND DISCONNECT SWITCH
MAIN FUSE
BOX/BREAKER
PANEL
DISCONNECT
SWITCH
2
GROUND
WARNING
Electric Shock Hazard. Can cause injury or death.
Line voltage is present at all components on units with single-pole contactors, even when unit is not in operation!
Unit may have multiple power supplies. Disconnect all remote electric power supplies before opening access panel.
Unit must be grounded in accordance with national and local codes.
HIGH VOLTAGE POWER SUPPLY CONNECTIONS
G
L1
L2
OUTDOOR
UNIT
CONTROL BOX
Refer to the unit nameplate for minimum circuit ampacity amperage minimum, and maximum fuse or circuit breaker fusible (HACR per NEC). Install power wiring and properly sized disconnect switch.
NOTE − Units are approved for use only with copper conductors. Ground unit at disconnect switch or to an earth ground.
3
INSTALL THERMOSTAT
THERMOSTAT
Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area and 5 feet (1.5m) from the floor. It should not be installed on an outside wall or where it can be affected by sunlight, drafts or vibrations.
5 FEET
(1.5M)
CONDUIT
CUTOUT
CONDUIT
NOTE − Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring.
NOTE − To facilitate a conduit, a cutout is located in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting.
CONTROL WIRING
4
NOTE − 24VAC, CLASS II CIRCUIT CONNECTIONS ARE MADE IN THE CONTROL BOX.
OUTDOOR UNIT
CONTROL BOX
YELLOW
(Y1)
BLACK
(COM)
Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated.
NOTE − See figure 30 for additional furnace and blower coil application diagrams.
R
W
COOLING
Y
G
COMMON
C
POWER
HEAT
INDOOR
BLOWER
THERMOSTATINDOOR UNIT
R
W1
Y
G
C
506120−01 03/10
Page 18
Page 19
5
LOW VOLTAGE CONNECTIONS
CUTOUT WITH
GROMMET
A
24V CONTROL WIRES
C
WIRE NUTS
BLACK
B
YELLOW
D
TIGHTEN WIRE TIE
HIGH VOLTAGE FIELD WIRING
FACTORY WIRING
LOW VOLTAGE (24V) FIELD WIRING
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.
NOTE − For proper voltages, select thermostat wire (control wires) gauge per table above.
NOTE − Do not bundle any excess 24VAC control wires inside control box.
A Run 24VAC control wires through cutout with grommet. B Run 24VAC control wires through wire tie. C Make 24VAC control wire connections using field provided wire
nuts.
D Tighten wire tie to security 24V control wiring.
NOTE − Wire tie provides low voltage wire strain relief and to main­tain separation of field installed low and high voltage circuits.
XC13
XC13
XC13
XC13 XC13
XC13
NOTE − Refer to furnace, blower coil and accessory instructions for additional wiring configurations with other optional controls.
Figure 30. 24VAC Control Wiring Diagrams (Field Installed)
XC13
Page 19
XC13 SERIES
Page 20
Figure 31. Typical XC13 Unit Wiring Diagram
Servicing Outdoor Unit Delivered Void of Charge
If the outdoor unit is void of refrigerant, clean the system using the procedure described below.
1. Use nitrogen to pressurize the system and check for leaks as described in Testing for Leaks on page 15.
2. Repair all leaks.
3. Evacuate the system to remove as much of the moisture as possible as described in Evacuating the System on page 16.
506120−01 03/10
4. Use nitrogen to break the vacuum and install a new filter drier in the system.
5. Evacuate the system again. Then, weigh the appropriate amount of HFC−410A refrigerant as listed on unit nameplate into the system using Charging System on page .
6. Monitor the system to determine the amount of moisture remaining in the oil. It may be necessary to replace the filter drier several times to achieve the required dryness level. If system dryness is not
verified, the compressor will fail in the future.
Page 20
Page 21
Start−Up Procedure
Use the following procedure prior to starting up the unit for the first time.
1. Rotate fan to check for binding.
2. Inspect all factory− and field−installed wiring for loose connections.
3. Open the liquid line and suction line service valves to release the refrigerant charge (contained in outdoor unit) into the system.
4. Replace the stem caps and secure finger tight, then tighten an additional one-sixth (1/6) of a turn as illustrated in figure 1.
5. Check voltage supply at the disconnect switch. The voltage must be within the range listed on the unit’s nameplate. If not, do not start the equipment until you
Testing Charge Procedure
have consulted the power company and the voltage condition has been corrected.
IMPORTANT
If unit is equipped with a crankcase heater and the outdoor ambient air is 50ºF (10ºC) or below, it should be energized 24 hours before unit start−up to prevent compressor damage as a result of slugging.
6. Set the thermostat for a cooling demand. Turn on power to the indoor blower and close the outdoor unit disconnect switch to start the unit.
7. Recheck voltage while the unit is running. Power must be within range shown on the nameplate.
8. Check system for sufficient refrigerate using the procedures outlined in Charging System on page .
TEMPERATURE
SENSOR
MANIFOLD
GAUGE SET
D
B
TO SUCTION
QC RESTRICTOR
FITTING
REFRIGERANT
TANK
CHARGING SYSTEM
A
A Close manifold gauge set valves and connect the center hose to an upright cylinder of HFC−410A. B Connect the manifold gauge set’s low pressure side to the suction line service port. C Connect the manifold gauge set’s high pressure side to the liquid line service port. D Position temperature sensor on liquid line near liquid line service port.
SERVICE VALVE
TEMPERATURE SENSOR
(LIQUID LINE)
OUTDOOR UNIT
TO LIQUID
LINE SERVICE
VALV E
C
Figure 32. Connecting Gauge Set for Testing and Charging
Page 21
XC13 SERIES
Page 22
INDOOR COIL AIRFLOW CHECK
Temp. of air entering indoor coil ºF
A
Wet−bulb ºF
C
53º
DRY
BULB
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
Dry−bulb
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
57 58 59 60 61 62 63 64 65 66 67 68 69 70
T
Drop
19º
DT
air flowair flow
1. Determine the desired DTMeasure entering air temperature using dry bulb (A) and wet bulb (B). DT is the intersecting value of A and B in the table (see triangle).
2. Find temperature drop across coilMeasure the coil’s dry bulb entering and leaving air temperatures (A and C). Temperature Drop Formula: (T
3. Determine if fan needs adjustmentIf the difference between the measured T adjustment is needed. See examples: Assume DT = 15 and A temp. = 72º, these C temperatures would necessitate stated actions:
Cº T
Drop
B
A
72º
B
64º
DRY
BULB
53º 19 – 15 = 4 Increase the airflow 58º 14 – 15 = −1 (within +3º range) no change 62º 10 – 15 = −5 Decrease the airflow
4. Adjust the fan speedSee indoor unit instructions to
increase/decrease fan speed.
Changing air flow affects all temperatures; recheck temperatures to confirm that the temperature drop and DT are within +3º.
) = A minus C.
Drop
and the desired DT (T
Drop
– DT = ºF ACTION
Drop
–DT) is within +3º, no
All temperatures are
expressed in ºF
INDOOR COIL
WET
BULB
Check indoor coil airflow using the Delta−T (DT) process as illustrated.
Figure 33. Indoor Coil Airflow Check
Charging System
DETERMINING CHARGE METHOD
START: Determine how refrigerant is metered
WHEN TO CHARGE?
Warm weather best Can charge in colder weather
CHARGE METHOD? Determine by:
Metering device type Outdoor ambient temperature
REQUIREMENTS:
Sufficient heat load in structure Indoor temperature between 70-80ºF
(21−26ºC)
Manifold gauge set connected to unit Thermometers:
− to measure outdoor ambient temperature
− to measure liquid line temperature
− to measure suction line temperature
A
64ºF
(17.7ºC) and
Below
WEIGH-IN
TXV
B
65ºF
(18.3ºC) and
Above
APPROACH OR
SUBCOOLING
C
Which indoor
metering
device?
D
40ºF
(4.4ºC) and
Above
FIXED
ORIFICE
E
39ºF
(3.8ºC) and
Below
WEIGH-INSUPERHEAT
506120−01 03/10
Figure 34. Determining Charge Method
Page 22
Page 23
START: Measure outdoor ambient temperature
USE EITHER APPROACH
OR SUBCOOLING
METHOD
A
WEIGH IN TXV
Once refrigerant charge is correct, disconnect gauge set and replace service port caps.
65ºF
and
ABOVE
ABOVE or
BELOW
64ºF and
BELOW
1. Connect gauge set as illustrated in figure
32.
2. Check Liquid and suction line pressures
3. Compare unit pressures with table 4, Normal Operating Pressures.
4. Weigh in the unit nameplate charge plus any charge required for line set differences over feet.
This nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.
Refrigerant
Charge per Line
Set Length
Liquid Line
Set Diameter
3/8" (9.5 mm)
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5’ (85 g per 1.5 m)
Figure 35. Using HFC−410A Weigh In (TXV) Charge Method
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
DO NOT CHARGE UNIT
Weigh-in or remove refrigerant
(Results of charging at low
based upon line length
temperatures not reliable)
64ºF and
BELOW
B
APPROACH TXV
If refrigerant is added or removed, retest to confirm that unit is properly charged.
If value is greater than shown (high approach), add refrigerant; if less than shown (liquid temperature too close to ambient temperature, low approach), remove refrigerant.
NOTE − *If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft. (4.6 m), subtract this amount.
65ºF
and
ABOVE
ABOVE or
BELOW
APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])
ºF (ºC)* −018 −024 −030 −036 −042 −048 −060 Any 4 (2.2) 8 (4.4) 8 (4.4) 11 (6.1) 7 (3.9) 8 (4.4) 9 (5.0) *Temperature of air entering outdoor coil
1. Connect gauge set as illustrated in figure 32.
2. Confirm proper airflow across coil using figure 33.
3. Compare unit pressures with table 4, Normal Operating Pressures.
4. Set thermostat to call for heat (must have a cooling load between 70-80ºF (21−26ºC).
5. When heat demand is satisfied, set thermostat to call for cooling.
6. Allow temperatures and pressures to stabilize.
7. Record outdoor ambient temperature:
AMBº =_________
8. Record liquid line temperature:
LIQº = __________
9. Subtract to determine approach (APPº):
LIQº_____ − AMBº _____ = APPº_____
10. Compare results with table below.
Figure 36. Using HFC−410A Approach (TXV) Charge Method
Page 23
XC13 SERIES
Page 24
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
DO NOT CHARGE UNIT
Weigh-in or remove refrigerant
(Results of charging at low
based upon line length
temperatures not reliable)
64ºF and
ABOVE or
BELOW
BELOW
C
SUBCOOLING TXV
BLOCK OUTDOOR COIL: [sometimes necessary with lower temperatures] Use cardboard or plastic sheet to restrict the airflow through the outdoor coil to achieve pressures from 325−375 psig (2240−2585 kPa). Higher pressures are needed to check charge. Block equal sections of air intake panels and move coverings sideways until the liquid pressure is in the above noted ranges.
Once refrigerant charge is correct, disconnect gauge set and replace service port caps.
CARDBOARD OR
PLASTIC SHEETS
65ºF
and
ABOVE
1. Connect gauge set as illustrated in figure 32.
2. Confirm proper airflow across coil using figure 33.
3. Compare unit pressures with table 4, Normal Operating Pressures.
4. Set thermostat to call for heat (must have a cooling load between 70-80ºF (21−26ºC)
5. Measure outdoor ambient temperature
6. When heat demand is satisfied, set thermostat to call for cooling
7. Allow temperatures and pressures to stabilize.
NOTE − If necessary, block outdoor coil to maintain 325 − 375 psig.
8. Record liquid line temperature:
LIQº = ______
9. Measure liquid line pressure and use the value to determine saturation temperature (see table 3):
SATº = ______
10. Subtract to determine subcooling (SCº):
SATº_____ − LIQº _____ = SCº _____
11. Compare results with table below.
If refrigerant is added or removed, verify charge using the Approach Method.
If value is LESS than shown, add refrigerant.
If value is MORE than shown, remove refrigerant.
MORE or
LESS
Figure 37. Using HFC−410A Subcooling (TXV) Charge Method
START: Measure outdoor ambient temperature
USE SUPERHEAT
40ºF
and
ABOVE
D
WEIGH IN FIXED ORIFICE
Once refrigerant charge is correct, disconnect gauge set and replace service port caps.
Refrigerant Charge per Line Set Length
Liquid Line
Set Diameter
3/8" (9.5 mm)
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5’ (85 g per 1.5 m)
SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°])
ºF (ºC)* −018 −024 −030 −036 −042 −048 −060 Any 10 (5.6) 10 (5.6) 9 (5.0) 12 (6.7) 8 (4.4) 9 (5.0) 7 (3.9) *Temperature of air entering outdoor coil
39ºF and
BELOW
ABOVE or
BELOW
1. Connect gauge set as illustrated in figure
32.
2. Check Liquid and suction line pressures
3. Compare unit pressures with table 4, Normal Operating Pressures.
4. Weigh in the unit nameplate charge plus any charge required for line set differences over feet.
This nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.
NOTE − *If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft. (4.6 m), subtract this amount.
Figure 38. Using HFC−410A Weigh In (Fixed Orifice) Charge Method
506120−01 03/10
Page 24
Page 25
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant based upon line length
Once refrigerant charge is correct, disconnect gauge set and replace service port caps.
If refrigerant is REMOVED, retest to confirm that unit is properly charged.
If value is LESS than shown, then REMOVE refrigerant.
ºF* 50 52 54 56 58 60 62 64 66 68 70 72 74 76 40 15 18 20 23 26 29 32 34 38 41 43 46 48 51 45 13 16 18 21 24 27 30 33 36 39 41 44 46 49 50 11 14 16 19 22 25 28 31 34 37 39 42 44 47 55 9 12141720232730333638404244 60 7 10121518212427303335384043 65 - 6 10 13 16 19 21 24 27 30 33 36 38 41 70 - - 7 1013161921242730333639 75 - - - 6 9 121518212428313437 80 - - - - 5 8 12 15 18 21 25 28 31 35 85 - - - - - - 8 11 15 19 22 26 30 33 90 - - - - - - 5 9 131620242731 95 - - - - - - - 6 101418222529 100 --------81216212428 105 --------5913172226 110 ---------611152025 115 ----------8141824
* Dry−bulb temperature (ºF) of entering outdoor ambient air.
39ºF and
BELOW
SHº (Superheat) Values (+/−5ºF)
Wet Bulb (air entering indoor coil)
MORE or
LESS
ABOVE or
BELOW
40ºF
and
ABOVE
If value is MORE than shown, then ADD refrigerant.
1. Confirm proper airflow across coil using figure 33.
2. Compare unit pressures with Table 4, Normal Operating Pressures.
3. Use SUPERHEAT to correctly charge unit or to verify the charge is correct.
4. Set thermostat to call for heat (must have a cooling load between 70-80ºF (21−26ºC)
5. Connect gauge set.
6. When heat demand is satisfied, set thermostat to call for cooling.
7. Allow temperatures and pressures to stabilize.
8. Measure the suction line pressure and use the use value to determine saturation temperature (table
3):
SATº =_________
9. Record suction line temperature:
VAPº =_________
10. Subtract to determine superheat (SHº):
VAPº − _____ SATº ______ = SHº______
11. Record the wet bulb temperature (air entering indoor coil):
WB =_______
12. Record outdoor ambient temperature.
13. Compare results with table to the left.
NOTE − Do not attempt to charge system where a dash appears, system could be overcharged. Superheat is taken at suction line service port. Suction line superheat must never be less than 5ºF at the suction line service port.
If refrigerant is ADDED, retest to confirm that unit is properly charged.
Once refrigerant charge is correct, disconnect gauge set and replace service port caps.
Figure 39. Using HFC−410A Superheat (Fixed Orifice) Charge Method
Table 3. HFC−410A Temperature (°F) − Pressure (Psig)
°F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig
32 100.8 48 137.1 63 178.5 79 231.6 94 290.8 110 365.0 33 102.9 49 139.6 64 181.6 80 235.3 95 295.1 111 370.0 126 451.8 142 552.3
34 105.0 50 142.2 65 184.3 81 239.0 96 299.4 112 375.1 127 457.6 143 559.1 35 107.1 51 144.8 66 187.7 82 242.7 97 303.8 113 380.2 128 463.5 144 565.9 36 109.2 52 147.4 67 190.9 83 246.5 98 308.2 114 385.4 129 469.5 145 572.8
37 111.4 53 150.1 68 194.1 84 250.3 99 312.7 115 390.7 130 475.6 146 579.8 38 113.6 54 152.8 69 197.3 85 254.1 100 317.2 116 396.0 131 481.6 147 586.8 39 115.8 55 155.5 70 200.6 86 258.0 101 321.8 117 401.3 132 487.8 148 593.8
40 118.0 56 158.2 71 203.9 87 262.0 102 326.4 118 406.7 133 494.0 149 601.0 41 120.3 57 161.0 72 207.2 88 266.0 103 331.0 119 412.2 134 500.2 150 608.1 42 122.6 58 163.9 73 210.6 89 270.0 104 335.7 120 417.7 135 506.5 151 615.4
43 125.0 59 166.7 74 214.0 90 274.1 105 340.5 121 423.2 136 512.9 152 622.7 44 127.3 60 169.6 75 217.4 91 278.2 106 345.3 122 428.8 137 519.3 153 630.1 45 129.7 61 172.6 76 220.9 92 282.3 107 350.1 123 434.5 138 525.8 154 637.5
46 132.2 62 175.4 77 224.4 93 286.5 108 355.0 124 440.2 139 532.4 155 645.0
47 134.6 78 228.0 109 360.0 140 539.0
125 445.9
141 545.6
Page 25
XC13 SERIES
Page 26
Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)
Use this table to perform maintenance checks; it is not a procedure for charging the system. Minor variations in these pressures may be due to
IMPORTANT
differences in installations. Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system.
XC13 −018 −024 −030 −036 −042 −048 −060
5F (5C) * Liquid Line Pressure / Vapor Line Pressure **
Expansion Valve
65 (18) 233 / 132 244 / 137 248 / 127 263 / 135 235 / 128 235 / 132 241 / 130
70 (21) 251 / 133 263 / 138 263 / 131 281 / 138 249 / 129 254 / 132 260 / 130
75 (24) 265 / 133 285 / 139 284 / 132 302 / 140 268 / 130 276 / 134 280 / 132
80 (26) 292 / 135 307 / 140 307 / 134 325 / 142 290 / 132 298 / 134 299 / 134
85 (29) 314 / 136 329 / 141 330 / 135 349 / 142 313 / 133 323 / 135 321 / 135
90 (32) 338 / 137 354 / 142 355 / 136 375 / 143 337 / 134 350 / 137 344 / 134
95 (35) 362 / 138 379 / 143 380 / 137 404 / 144 364 / 134 377 / 138 371 / 135
100 (38) 388 / 140 404 / 144 407 / 138 433 / 145 389 / 135 406 / 140 400 / 137
105 (41) 415 / 141 438 / 145 434 / 139 462 / 147 416 / 136 430 / 141 428 / 139
110 (43) 444 / 142 464 / 147 465 / 141 494 / 149 445 / 137 464 / 142 458 / 141
115 (46) 475 / 143 495 / 148 497 / 142 527 / 150 473 / 139 495 / 143 484 / 142
Fixed Orifice
65 (18) 233 / 121 246 / 126 245 / 123 261 / 134 236 / 119 247 / 125 248 / 124
70 (21) 250 / 124 265 / 129 265 / 126 281 / 136 250 / 121 266 / 128 266 / 126
75 (24) 270 / 128 286 / 132 286 / 129 301 / 138 269 / 124 286 / 131 288 / 130
80 (26) 291 / 131 307 / 135 308 / 132 324 / 140 290 / 127 307 / 133 309 / 133
85 (29) 313 / 134 330 / 137 331 / 135 346 / 142 312 / 130 329 / 135 330 / 135
90 (32) 335 / 136 353 / 140 355 / 138 371 / 144 334 / 133 353 / 138 354 / 138
95 (35) 359 / 138 378 / 142 380 / 140 396 / 146 360 / 136 377 / 140 377 / 140
100 (38) 383 / 140 402 / 143 405 / 142 422 / 148 385 / 139 403 / 142 406 / 142
105 (41) 409 / 142 428 / 145 431 / 144 448 / 150 413 / 141 428 / 144 431 / 144
110 (43) 436 / 145 456 / 147 458 / 146 477 / 151 438 / 143 455 / 146 457 / 146
115 (46) 464 / 147 486 / 149 487 / 148 506 / 153 466 / 145 483 / 147 484 / 148
*Temperature of the air entering the outside coil. **Typical pressures; indoor unit match up, indoor air quality equipment, and indoor load causes pressure variance
System Operation
FILTER DRIER
A filter drier is factory-installed as illustrated in Unit Dimensions on page 2, with each XC13 unit to ensure a
The outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermostat blower switch is in the ON position, the indoor blower operates continuously.
clean, moisture−free system. A replacement filter drier is available from Lennox. Refer to Lennox Repair Part Program.
Maintenance
HIGH PRESSURE SWITCH
XC13 units are equipped with a high-pressure switch that is located in the liquid line of the compressor as illustrated in Unit Dimensions on page 2. The switch is a Single Pole, Single Throw (SPST), manual−reset switch with red cap that is normally closed and removes power from the compressor when discharge pressure rises above factory setting at 590 + 10 psi.
Installation and service must be performed by a licensed professional installer (or equivalent) or a
WARNING
service agency.
DISCHARGE THERMOSTAT
Each XC13 unit is equipped with a discharge thermostat located in the discharge line of the compressor. The switch (SPST, auto−reset, normally closed) and removes power from the compressor when discharge temperature exceeds the factory setting of 220ºF +5ºF.
At the beginning of each cooling season, the system should be checked as follows:
1. Clean and inspect the outdoor coil. The coil may be flushed with a water hose. Ensure the power is turned off before you clean the coil.
506120−01 03/10
Page 26
Page 27
2. Outdoor fan motor is prelubricated and sealed. No further lubrication is needed.
3. Visually inspect connecting lines and coils for evidence of oil leaks.
4. Check wiring for loose connections.
5. Check for correct voltage at the unit (with the unit operating).
6. Check amp−draw outdoor fan motor.
UNIT NAMEPLATE: _________ ACTUAL: __________
NOTE − If owner reports insufficient cooling, the unit should be gauged and refrigerant charge checked.
INDOOR COIL
1. Clean coil, if necessary.
2. Check connecting lines and coils for signs of oil leaks.
3. Check condensate line and clean, if necessary.
INDOOR UNIT
1. Clean or change filters.
2. 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 tables and procedure.
3. Check blower drive belt for wear and proper tension.
4. Check all wiring for loose connections
5. Check for correct voltage at unit (blower operating).
6. Check amp−draw on blower motor.
UNIT NAMEPLATE: _________ ACTUAL: __________
Homeowner Information
MAINTENANCE
In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level.
1. Air FilterAsk your Lennox dealer to show you where your indoor unit’s filter is located. It will be either at the indoor unit (installed internal or external to the cabinet) or behind a return air grille in the wall or ceiling. Check the filter monthly and clean or replace it as needed.
2. Disposable FilterDisposable filters should be replaced with a filter of the same type and size.
NOTE − If you are unsure about the filter required for your system, call your Lennox dealer for assistance.
3. Reusable FilterMany indoor units are equipped with reusable foam filters. Clean foam filters with a mild soap and water solution; rinse thoroughly; allow filter to dry completely before returning it to the unit or grille.
NOTE − The filter and all access panels must be in place any time the unit is in operation.
4. Electronic Air CleanerSome systems are equipped with an electronic air cleaner, designed to remove airborne particles from the air passing through
the cleaner. If your system is so equipped, ask your dealer for maintenance instructions.
5. Indoor UnitThe indoor unit’s evaporator coil is
equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you the location of the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)
IMPORTANT
Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water. Prolonged exposure of the unit to treated water (i.e., sprinkler systems, soakers, waste water, etc.) will corrode the surface of steel and aluminum parts and diminish performance and longevity of the unit.
6. Outdoor UnitMake sure no obstructions restrict
airflow to the outdoor unit. Leaves, trash or shrubs crowding the unit cause the outdoor unit to work harder and use more energy. Keep shrubbery trimmed away from the unit and periodically check for debris which collects around the unit. When removing debris from around the unit, be aware of metal edges on parts and screws. Although special care has been taken to keep exposed edges to a minimum, physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Cleaning of the outdoor unit’s coil should be performed by a trained service technician. Contact your dealer and set up a schedule (preferably twice a year, but at least once a year) to inspect and service your air conditioning or heat pump system.
THERMOSTAT OPERATION
Thermostat operations vary from one thermostat to another. The following provides general operation procedures. Refer to the user’s information manual provided with your thermostat for specific operation details.
Temperature Setting Levers − Set the lever or dial to
the desired temperature setpoints for both heating and cooling. Avoid frequent temperature adjustment; turning the unit offthen back onbefore pressures can equalize will put unusual stress on the unit’s compressor.
Fan Switch − In AUTO or INT (intermittent) mode, the
blower operates only when the thermostat calls for heating or cooling. This mode is generally preferred when humidity control is a priority. The ON or CONT mode provides continuous indoor blower operation, regardless of whether the compressor or furnace is operating. This mode is required when constant air circulation or filtering is desired.
System Switch − Set the system switch for heating,
cooling or auto operation. The auto mode allows the system to automatically switch from heating mode to cooling mode to maintain predetermined comfort settings.
Page 27
XC13 SERIES
Page 28
Temperature Indicator − The temperature indicator
displays the actual room temperature.
PROGRAMMABLE THERMOSTATS
Your Lennox system may be controlled by a programmable thermostat. These thermostats provide the added feature of programmable time-of-day set points for both heating and cooling. Refer to the user’s information manual provided with your thermostat for operation details.
Preservice Check
If your system fails to operate, check the following before calling for service:
Make sure all electrical disconnect switches are ON.
Make sure the room thermostat Temperature Selector
and System Switch (Heat, Cool, Auto) are properly set.
Check for and replace any blown fuses, or reset any
tripped circuit breakers.
Make sure unit access panels are in place. Make sure air filter is clean.
Write down the unit model number and have it handy
before calling.
OPTIONAL ACCESSORIES
Refer to the Lennox XC13 Engineering Handbook for the latest available accessories for this unit.
Start−Up and Performance Checklist
Job Name Job no. Date
Job Location City State
Installer City State
Unit Model No. Serial No. Service Technician
Nameplate Voltage
Rated Load Ampacity Compressor Outdoor Fan
Maximum Fuse or Circuit Breaker
Electrical Connections Tight? Indoor Filter clean? Supply Voltage (Unit Off)
Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.
Discharge Pressure Suction Pressure Refrigerant Charge Checked?
Refrigerant Lines: Leak Checked? Properly Insulated? Outdoor Fan Checked?
Service Valves: Fully Opened? Caps Tight? Thermostat
Voltage With Compressor Operating Calibrated? Properly Set?  Level? 
506120−01 03/10
Page 28
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