advertisement
2012 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.
Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.
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.
IMPORTANT
This unit must be matched with an indoor coil as specified in Lennox Engineering Handbook. Coils previously charged with HCFC-22 must be flushed.
NOTICE TO INSTALLER
UNIT PLACEMENT
It is critical for proper unit operation to place outdoor unit on an elevated surface as described in Unit Placement
BRAZING LINE SET TO SERVICE
VALVES
It is imperative to follow the brazing technique illustrated starting on
page 6 to avoid damaging the service valve's internal seals.
INSTALLATION
INSTRUCTIONS
Small Splits TSA*H4 Units
AIR CONDITIONER
506
646-01
4/2012
Supersedes 11/2010
TABLE OF CONTENTS
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification . . . . . . . . . . . . . . . . . . . . . .
3
Operating Manifold Gauge Set and Service Valves . . .
New Unit Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
New or Replacement Line Set . . . . . . . . . . . . . . . . . . . . .
Brazing Connections . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flushing Line Set and Indoor Coil . . . . . . . . . . . . . . . .
Installing Indoor Metering Device . . . . . . . . . . . . . . . .
Leak Test Line Set and Indoor Coil
Evacuating Line Set and Indoor Coil
. . . . . . . . . . . . . .
. . . . . . . . . . . . .
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge . . . . . . . . . . .
Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-Up and Performance Checklist . . . . . . . . . . . . . .
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 — Liquid line filter drier
General
TSA*H4 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
TSA*H4 Engineering Handbook .
This outdoor unit is designed for use in systems that use one of the following refrigerant metering devices:
Thermal expansion valve (TXV)
4/2012 506646-01
Page 1
Unit Dimensions - Inches (mm)
A
OUTDOOR COIL FAN
A
Discharge Air
COMPRESSOR
B
SUCTION AND LIQUID LINE
CONNECTIONS
OPTIONAL UNIT STAND‐OFF KIT
(4) (FIELD-INSTALLED)
SIDE VIEW SIDE VIEW
Model Numbers
TSA036H4N4
TSA042H4N4
TSA048H4N4
TSA060H4N4
A
28-1/4 (718)
28-1/4 (718)
28-1/4 (718)
32-1/4 (819)
B
37-1/4 (946)
29-1/4 (743)
37-1/4 (946)
33-1/4 (845)
Operating Manifold Gauge Set and
Service Valves
These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation.
CAUTION
Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Be aware of, and use caution when working near these areas during installation or while servicing this equipment.
IMPORTANT
To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted snugly over the cap before tightening.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 provides
torque values for fasteners.
Table 1. Torque Requirements
TORQUE REQUIREMENTS
When servicing or repairing heating, ventilating, and air conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.
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.
See the Lennox Service and Application Notes #C-08-1 for further details and information.
Parts Recommended Torque
Service valve cap
Sheet metal screws
8 ft.- lb.
16 in.- lb.
Machine screws #10 28 in.- lb.
Compressor bolts 90 in.- lb.
Gauge port seal cap 8 ft.- lb.
11 NM
2 NM
3 NM
10 NM
11 NM
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold gauge set that features low loss anti-blow back fittings.
Page 2
Manifold gauge set 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 psig on the high side and a low side of 30” vacuum to 250 psig with dampened speed to
500 psi. Gauge hoses must be rated for use at up to 800 psig of pressure with a 4000 psig burst rating.
506 11/2012
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for removing refrigerant, flushing, leak testing, evacuating, checking charge and charging.
Each valve is equipped with a service port which has a
factory-installed valve stem. Figure 1 provides information
on how to access and operating both angle and ball service valves.
Operating Angle Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.
SERVICE PORT CAP
SERVICE PORT CORE
TO INDOOR
UNIT (VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
SERVICE PORT
CORE
STEM CAP
TO OUTDOOR UNIT
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
When service valve is OPEN , the service port is open to linE set, indoor and outdoor unit.
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
WHEN SERVICE VALVE IS
CLOSED
, THE SERVICE PORT IS OPEN
TO THE LIN
E
SET AND INDOOR UNIT.
Operating Ball Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open. To open valve, rotate stem counterclockwise 90°. To close rotate stem clockwise 90°.
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CORE
SERVICE PORT
CAP
TO OUTDOOR
UNIT
TO INDOOR UNIT
BALL (SHOWN
CLOSED)
VALVE
STEM
STEM CAP
To Access 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 set to service port.
3. When testing is completed, replace service port cap and tighten as follows:
1/6 TURN
With torque wrench: Finger tighten and
Without torque wrench: Finger tighten and use an appropriately sized wrench to turn an additional 1/6 turn clockwise.
Reinstall Stem Cap:
10
11 12
9
8
7
6
1
5
2
4
3
Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows:
1/12 TURN
With Torque Wrench: Finger tighten and
Without Torque Wrench: Finger tight en and use an appropriately sized wrench to turn an additional 1/12 turn clockwise.
9
10
8
11 12
7
6
1
5
2
4
3
NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
Figure 1. Angle and Ball Service Valves
Page 3
TSA*H4 SERIES
CLEARANCE ON ALL SIDES — INCHES (MILLIMETERS)
6 (152)
12 (305)
36 (914)
ACCESS PANEL
30 (762)
NOTES:
Clearance to one of the other three sides must be 36 inches (914mm).
Clearance to one of the remaining two sides may be 12 inches
(305mm) and the final side may be
6 inches (152mm).
LINE SET
CONNECTIONS
MINIMUM CLEARANCE BETWEEN
TWO UNITS
24 (610)
MINIMUM CLEARANCE
ABOVE UNIT
48 (1219)
DETAIL A
Install unit away from windows .
Figure 2. Installation Clearances
DETAIL B
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.
STRUCTURE
DISCHARGE AIR
Two 90° elbows installed in line set will reduce line set vibration.
GROUND LEVEL
MOUNTING SLAB MUST SLOPE
AWAY FROM BUILDING.
New Unit Placement
Figure 3. Placement, and Slab Mounting
See Unit Dimensions
on page 2 for sizing mounting slab,
platforms or supports. Refer to figure 2 for mandatory
installation clearance requirements.
CAUTION
In order to avoid injury, take proper precaution when lifting heavy objects.
POSITIONING CONSIDERATIONS
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 3,
detail A.
Page 4
506 11/2012
PLACING 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 3,
detail B.
ROOF MOUNTING
Install the unit a minimum of 6 inches (152 mm) above the roof surface to avoid ice build-up around the unit. Locate the unit above a load bearing wall or area of the roof that can adequately support the unit. Consult local codes for rooftop applications.
If unit coil cannot be mounted away from prevailing winter winds, a wind barrier should be constructed. Size barrier at least the same height and width as outdoor unit. Mount barrier 24 inches (610 mm) from the sides of the unit in the direction of prevailing winds.
NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some rubber roofing material may absorb oil and cause the rubber to swell when it comes into contact with oil. The rubber will then bubble and could cause leaks. Protect the roof surface to avoid exposure to refrigerant and oil during service and installation. Failure to follow this notice could result in damage to roof surface.
New or Replacement Line Set
This section provides information on new installation or replacement of existing line set. If a new or replacement line set is not required, then proceed to Brazing
Connections
Field refrigerant piping consists of liquid and suction lines from the outdoor unit (braze connections) to the indoor unit coil (flare or braze connections). Use Lennox L15 (braze, non-flare) series line set, or use field-fabricated refrigerant
NOTE - When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351-L9, or contact
Lennox Technical Support Product Applications for assistance.
NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4).
To obtain the correct information from Lennox, be sure to communicate the following points:
Model (TSA*H4) 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.
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.
IMPORTANT
Mineral oils are not compatible with HFC-410A .
If oil must be added, it must be a Polyol ester oil.
The compressor is charged with sufficient Polyol ester oil for line set lengths up to 50 feet. Recommend adding oil to system based on the amount of refrigerant charge in the system. No need to add oil in system with 20 pounds of refrigerant or less. For systems over 20 pounds - add one ounce of every five pounds of refrigerant.
Recommended topping-off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATE RL32CF.
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.
If the TSA*H4 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 TSA*H4 unit.
Typically a liquid line used to meter flow is 1/4” in diameter and copper.
LIQUID LINE FILTER DRIER INSTALLATION
The filter drier (one is shipped with each TSA*H4 unit) must be field installed in the liquid line between the outdoor unit's liquid line service valve and the indoor coil's metering
device (fixed orifice or TXV) as illustrated in figure 4. This
filter drier must be installed to ensure a clean, moisture-free system. Failure to install the filter drier will void the warranty. A replacement filter drier is available from Lennox. See Brazing Connections
special procedures on brazing filter drier connections to the liquid line.
BRAZE CONNECTION POINTS
LIQUID LINE
SERVICE
VALVE
LINE
LIQUID LINE
FILTER DRIER
LIQUID
LINE
OUTDOOR
UNIT
Figure 4. Typical Liquid Line Filter Drier
Installation
Page 5
TSA*H4 SERIES
Models
Number
TSA036H4N4
TSA042H4N4
TSA048H4N4
Field Connections
Liquid Line
3/8 in. (10 mm)
TSA060H4N4 3/8 in. (10 mm)
Suction Line
7/8 in (22 mm)
Table 2. Refrigerant Line Set
Recommended Line Set
Liquid Line Suction Line
3/8 in. (10 mm)
1-1/8 in. (29 mm) 3/8 in. (10 mm)
7/8 in (22 mm)
L15 Line Set
L15-65 — 15 ft. - 50 ft. (4.6 m - 15 m)
1-1/8 in. (29 mm) Field Fabricated
IMPORTANT
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.
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.
Brazing Connections
Use the procedures outline in figures 5 and 6 for brazing
line set connections to service valves.
IMPORTANT
Connect gauge set low pressure side to vapor line service valve and repeat procedure starting at paragraph 4 for brazing the liquid line to service port valve.
IMPORTANT
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 pressurization of the low side shell and suction tubing. Application of a brazing torch to a pressurized system may result in ignition of the refrigerant and oil mixture - Check the high and low pressures before applying heat.
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).
IMPORTANT
Allow braze joint to cool before removing the wet rag from the service valve. Temperatures above 250ºF can damage valve seals.
IMPORTANT
Use silver alloy brazing rods with 5% minimum silver alloy for copper-to-copper brazing. Use 45% minimum alloy for copper-to-brass and copper-to-steel brazing.
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 fire and/or an ex plosion, that could result in property damage, personal injury or death.
Page 6
506 11/2012
1 CUT AND DEBUR
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.
CUT AND DEBUR
2 CAP AND CORE REMOVAL
Remove service cap and core from both the vapor and liquid line service ports.
SERVICE PORT
CAP
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
COPPER TUBE
STUB
SERVICE VALVE
CONNECTION
REDUCER
SERVICE
PORT
CORE
LIQUID LINE SERVICE
VALVE
SERVICE
PORT
CORE
SERVICE
PORT CAP
SUCTION / VAPOR LINE
SERVICE VALVE
LINE SET SIZE IS SMALLER
THAN CONNECTION
REFRIGERANT LINE
DO NOT CRIMP SERVICE
VALVE CONNECTOR WHEN
PIPE IS SMALLER THAN
CONNECTION
3 ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE
VALVES
Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the suction / vapor line service port valve.
A Connect gauge set low pressure side to liquid line service valve (service port).
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
B Connect gauge set center port to bottle of nitrogen with regulator.
LOW HIGH
C Remove Schrader valve in suction / vapor line service port to allow nitrogen to escape.
ATTACH
GAUGES
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
C
VAPOR LINE
INDOOR
UNIT
LIQUID LINE
SUCTION /
VAPOR LINE
SERVICE
VALVE
B
OUTDOOR
UNIT
LIQUID LINE SERVICE
VALVE
A
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
NITROGEN
Figure 5. Brazing Procedures
Page 7
TSA*H4 SERIES
4 WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap a saturated cloth around service valve bodies and copper tube stub. Use another saturated cloth underneath the valve body to protect the base paint.
5 FLOW NITROGEN
Flow regulated 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 manifold gauge set connections
6 BRAZE LINE SET
Wrap both service valves with a saturated cloth as illustrated here before brazing to line set.
LIQUID LINE SERVICE VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
IMPORTANT — Allow braze joint to cool. Apply additional saturated cloths to help cool brazed joint.
Do not remove wet rag until piping has cooled.
Temperatures above 250ºF will damage valve seals.
WARNING
1.
FIRE, PERSONAL INJURY, OR PROPERTY
DAMAGE will result if you do not wrap a wet cloth around both liquid and suction line service valve bodies and copper tube stub while brazing in the line set! The braze, when complete, must be quenched with water to absorb any residual heat.
2. Do not open service valves until refrigerant lines and indoor coil have been leak-tested and evacuated.
Refer to procedures provided in this supplement.
SATURATED CLOTH
LIQUID LINE
SUCTION / VAPOR LINE
SERVICE VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
SUCTION / VAPOR LINE
SATURATED CLOTH
7 PREPARATION FOR NEXT STEP
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply saturated rags to both services valves to cool piping. Once piping is cool, remove all wet cloths. Refer to the unit installation instructions for the next step in preparing the unit.
Figure 6. Brazing Procedures (continued)
Page 8
506 11/2012
Flushing Line Set and Indoor Coil
Flushing is only required if existing indoor coil and line set are to be used. Otherwise proceed to Installing Indoor Metering
Device
1A TYPICAL EXISTING FIXED ORIFICE
REMOVAL PROCEDURE (UNCASED
COIL SHOWN)
OR
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
1B TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
STUB END
TWO PIECE PATCH PLATE
LIQUID LINE CHECK
(UNCASED COIL ONLY)
ORIFICE EXPANSION
HOUSING
DISTRIBUTOR
VALVE
TEFLON
® TUBES
RING TEFLON
®
RING
FIXED ORIFICE
BRASS NUT
TEFLON®
RING
SENSING
LINE
DISTRIBUTOR
ASSEMBLY DISTRIBUTOR
ASSEMBLY
EQUALIZER
LINE REMOVE AND DISCARD
WHITE TEFLON
®
SEAL
(IF PRESENT) LIQUID LINE ASSEMBLY
(INCLUDES STRAINER) LIQUID LINE
ASSEMBLY WITH
BRASS NUT
A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor as sembly.
C Using two wrenches, disconnect liquid line from liquid line orifice hous ing. Take care not to twist or damage distributor tubes during this pro cess.
MALE EQUALIZER
LINE FITTING
SENSING BULB
VAPOR
LINE
LIQUID
LINE
D Remove and discard fixed orifice, valve stem assembly if present and
Teflon ® washer as illustrated above.
A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor assembly.
E Use a field-provided fitting to temporary reconnect the liquid line to the indoor unit's liquid line orifice housing.
C Disconnect the equalizer line from the check expansion valve equalizer line fitting on the vapor line.
2
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
INVERTED HCFC-22
CYLINDER CONTAINS
CLEAN HCFC-22 TO BE
USED FOR FLUSHING.
GAUGE
MANIFOLD
A
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR
UNIT
LIQUID LINE SERVICE
VALVE
CYLINDER
1
B
NEW
OUTDOOR
UNIT
C
LOW
OPENED
TANK
RETURN
INLET
DISCHARGE
CLOSED
RECOVERY MACHINE
HIGH
A Inverted HCFC-22 cylinder with clean refrigerant to the vapor 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.
D Remove the vapor line sensing bulb.
E Disconnect the liquid line from the check expansion valve at the liquid line assembly.
F Disconnect the check expansion valve from the liquid line orifice housing. Take care not to twist or damage distributor tubes during this process.
G Remove and discard check expansion valve and the two Teflon ® rings.
H Use a field-provided fitting to temporary reconnect the liquid line to the
3 indoor unit's liquid line orifice housing.
FLUSHING LINE SET
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.
A 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
B
B Invert the cylinder of clean HCFC-22 and open its valve to allow liquid refrigerant to flow into the system through the vapor 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.
C After all of the liquid refrigerant has been recovered, switch the recovery machine to vapor recovery so that all of the HCFC-22 vapor is recovered. Allow the recovery machine to pull down to 0 the system.
D 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.
Figure 7. Removing Metering Device and Flushing
Page 9
TSA*H4 SERIES
Installing Indoor Metering Device
This outdoor unit is designed for use in systems that use either an fixed orifice (RFC) (included with outdoor unit), or expansion valve metering device (purchased separately) at the indoor coil.
See the Lennox TSA*H4 Engineering Handbook for approved expansion valve kit match ups. The expansion valve 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 expansion valve in a manner that will provide access for field servicing of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit. .
After installation of the indoor coil metering device, proceed to Leak Test Line Set and Indoor Coil
INDOOR EXPANSION VALVE INSTALLATION
TWO PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
(Uncased Coil Shown)
LIQUID LINE
ORIFICE
HOUSING
STUB
END
EXPANSION
VALVE
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
TEFLON
®
RING
EQUALIZER
LINE bulb installation for bulb positioning.
TEFLON
®
RING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
Sensing bulb insulation is required if mounted external to the coil casing. sensing
EQUALIZER LINE INSTALLATION
SENSING
LINE
A 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 to the right.
B 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 to the right.
A Remove the field-provided fitting that temporary reconnected the liquid line to the indoor unit's distributor assembly.
B Install one of the provided Teflon ® rings around the stubbed end of the expansion valve and lightly lubricate the connector threads and expose surface of the Teflon ® ring with refrigerant oil.
C Attach the stubbed end of the expansion valve 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 the figure above, or 20 ft-lb.
D Place the remaining Teflon ® washer around the other end of the expansion valve. Lightly lubricate connector threads and expose surface of the Teflon ® ring with refrigerant oil.
E Attach the liquid line assembly to the expansion valve.
Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above or 20 ft-lb.
1/2 Turn
9
8
10
11 12
7
6
1
2
3
4
5
SENSING BULB INSTALLATION
A Attach the vapor line sensing bulb in the proper orientation as illustrated to the right using the clamp and screws provided.
1/8 Turn
LIQUID LINE
NOTE — Confirm proper thermal contact between vapor line and expansion bulb before insulating the sensing bulb once installed.
B Connect the equalizer line from the expansion valve to the equalizer vapor port on the vapor line. Finger tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated below.
10
11 12
9
8
7
6
1
2
3
4
5
VAPOR LINE
BULB
12
BULB
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.
FLARE SEAL CAP FLARE NUT
VAPOR LINE
OR COPPER FLARE
SEAL BONNET
12
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT ON
BOTTOM OF LINE.
MALE BRASS EQUALIZER
LINE FITTING
BULB
BULB
VAPOR LINE NOTE — NEVER MOUNT ON BOTTOM OF LINE.
Figure 8. Installing Indoor Expansion Valve
Page 10
506 11/2012
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.
IMPORTANT
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.
1 CONNECT GAUGE SET
A Connect an HFC-410A manifold gauge set high pressure hose to the vapor valve service port.
NOTE — Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage.
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 replaced by the nitrogen container.
Leak Test Line Set and Indoor Coil
IMPORTANT
Leak detector must be capable of sensing HFC refrigerant.
After completing the leak testing the line set and indoor coil
as outlined in figure 9, proceed to
Evacuating Line Set and
Indoor Coil
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).
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.
B
LOW HIGH
MANIFOLD GAUGE SET
A
OUTDOOR UNIT
TO VAPOR
SERVICE VALVE
2
NITROGEN
HFC-410A
TEST FOR LEAKS
After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks:
A With both manifold valves closed, connect 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) refrigerant or three pounds (31 kPa) pressure]. Close the valve on the HFC-410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC-410A cylinder.
C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
D 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.
E 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 .
F After leak testing disconnect gauges from service ports.
Figure 9. Leak Test
Page 11
TSA*H4 SERIES
Evacuating Line Set and Indoor Coil
1 CONNECT GAUGE SET
NOTE — Remove cores from service valves (if not already done).
A Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve
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 manifold gauge set. The center port line will be used later for both the
HFC-410A and nitrogen containers.
OUTDOOR
UNIT
A
NITROGEN
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
500
C
MICRON
GAUGE
TO VAPOR
SERVICE VALVE
LOW
MANIFOLD
GAUGE SET
HIGH
HFC-410A
B
VACUUM PUMP
TO LIQUID LINE
SERVICE VALVE
D
2 EVACUATE THE SYSTEM
A Open both manifold valves and start the vacuum pump.
B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
RECOMMEND
MINIMUM 3/8” HOSE
NOTE — During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure 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.
C When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:
Close manifold gauge valves
Close valve on vacuum pump
Turn off vacuum pump
Disconnect manifold gauge center port hose from vacuum pump
Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
Open manifold gauge valves to break the vacuum in the line set and indoor unit.
Close manifold gauge valves.
D Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the dry nitrogen from the line set and indoor unit.
E Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the 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 the vacuum pump 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 an upright cylinder of HFC-410A 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:
Close manifold gauge valves.
1/6 TURN
Shut off HFC-410A cylinder.
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core tool while maintaining a positive system pressure.
Replace stem caps and secure finger tight, then tighten an additional one-sixth (1/6) of a turn as illustrated.
9
10
8
11 12
7
6
1
5
2
4
3
Figure 10. Evacuating System
Page 12
506 11/2012
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.
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.
Evacuating the system of non-condensables is critical for proper operation of the unit. Non-condensables are
SIZE CIRCUIT AND INSTALL SERVICE
DISCONNECT SWITCH
Refer to the unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker (HACR per NEC). Install power wiring and properly sized disconnect switch.
SERVICE
DISCONNECT
SWITCH 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.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns. Use an instrument capable of accurately measuring down to 50 microns.
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 air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air handler for low‐voltage control power (24VAC - 40 VA minimum)
INSTALL 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 or drafts.
THERMOSTAT
5 FEET
(1.5M)
NOTE — Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
NOTE — 24VAC, Class II circuit connections are made in the control panel.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes.
Line voltage is present at all components when unit is not in operation on units with single‐pole contactors.
Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies.
Page 13
TSA*H4 SERIES
ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING
HIGH VOLTAGE / GROUND WIRES
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 in the bottom of the control panel.
Connect conduit to the control panel using a proper conduit fitting.
CONTROL WIRING
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
GROUND
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
NOTE — Wire tie provides low voltage control wire strain relief and to maintain separation of field installed low and high voltage circuits.
NOTE — For proper voltages, select thermostat wire (control wires) gauge per table above .
NOTE — Do not bundle any excess 24VAC control wires inside control panel.
GN
D
THREE PHASE
WIRE
NUTS
GROMMET
Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated.
A Run 24VAC control wires through hole with grommet and secure with provided wire tie.
THERMOSTAT
R
POWER
INDOOR UNIT
R
B Make 24VAC thermostat wire connections. Locate the two wires from the contactor and make connection using field provided wire nuts:
Yellow to Y1
Black to C (common)
W1
Y
HEA
T
COOLING
W
Y
HIGH VOLTAGE
FLEXIBLE CONDUIT
OUTDOOR
UNIT
Y1
G
INDOOR
BLOWER
G
B
CONTROL
WIRING
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100' (30 METERS) 16 35ºC MINIMUM.
C
COMMON
C C
A
GROMMET
AND WIRE TIE
Typical Field Wiring Diagram (Y and G Voltages) Typical Field Wiring Diagram (J Voltage)
Figure 11. Typical Wiring Diagram
Page 14
506 11/2012
Servicing Units Delivered Void of Charge
If the outdoor unit is void of refrigerant, clean the system using the procedure described below.
1. Leak check system using procedure outlined on page
2. Evacuate the system using procedure outlined on
3. Use nitrogen to break the vacuum and install a new filter drier in the system.
4. Evacuate the system again using procedure outlined
5. Weigh in refrigerant using procedure outlined under
Unit Start-Up
IMPORTANT
If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging.
1. Check that fan rotates freely.
2. Inspect all factory- and field-installed wiring for loose connections.
GAUGE SET
CONNECTIONS FOR TESTING AND CHARGING
B
SUCTION LINE
SERVICE PORT
CONNECTION
3. Open the liquid line and suction line service valve stems ( Operating Service Valves
release the refrigerant charge (contained in outdoor unit) into the system.
4. Replace the valve stem caps and tighten as specified in Operating Service Valves
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 have consulted with the power company and the voltage condition has been corrected.
6. Set the thermostat for a cooling demand. Turn on power to the indoor indoor unit 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 unit nameplate.
8. Check system for sufficient refrigerate using the procedures outlined in under System Refrigerant .
System Refrigerant
This section outlines procedures for:
1. Checking and adjusting indoor airflow as
2. Determine the best method for adding or removing
refrigerant as outlined in figure 13.
MANIFOLD GAUGE SET
LOW HIGH
OUTDOOR UNIT
A Close manifold gauge set valves and connect the center hose to a cylinder of
HFC-410A. Set for liquid phase charging.
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.
REFRIGERANT TANK
CHARGE IN
LIQUID PHASE
DIGITAL SCALE
A
C
TO LIQUID
LINE SERVICE
VALVE
TEMPERATURE SENSOR
(LIQUID LINE)
D
TEMPERATURE
SENSOR
Figure 12. Manifold Gauge Set Setup and Connections
Page 15
TSA*H4 SERIES
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
65ºF (18.3ºC)
AND ABOVE
APPROACH OR
SUBCOOLING
TXV
OUTDOOR AMBIENT
TEMPERATURE
64ºF (17.7ºC)
AND BELOW
WEIGH‐IN
CHECKING AIR FLOW AT INDOOR COIL
Figure 13. Determining Charge Method
Temp.
of air entering indoor coil ºF
A
Delta −
T
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
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
Wet-bulb ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70
B
C
53º
T
Drop
19º
A
72º
DRY
BULB air flow
All temperatures are expressed in ºF air flow
INDOOR
COIL
B
64º
WET
BULB
DRY
BULB
1. Determine the desired
D
T —Measure entering air temperature using dry bulb ( A ) and wet bulb ( B ). D T 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
Drop
) = A minus C .
3. Determine if fan needs adjustment —If the difference between the measured T
Drop
and the desired
D
T (T
Drop
–
D
T) is within +3º, no ad justment is needed. See examples: Assume
D
T = 15 and A temp. =
72º, these C temperatures would necessitate stated actions:
Cº T
Drop
– D T = ºF ACTION
53º
58º
62º
19
14
10
–
–
–
15
=
4 Increase the airflow
15
=
-1 (within +3º range) no change
15 = -5 Decrease the airflow
4. Adjust the fan speed —See indoor unit instructions to increase/de crease fan speed.
Changing air flow affects all temperatures; recheck temperatures to confirm that the temperature drop and D T are within +3º.
Figure 14. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart
START: Measure outdoor ambient temperature
USE SUBCOOLING
METHOD
65ºF
(18.3ºC) and
ABOVE
ABOVE or
BELOW
64ºF (17.7ºC) and BELOW
1. Check Liquid and suction line pressures
2. Compare unit pressures with table 3 or 6.
3. Conduct leak check; evacuate as previously outlined.
4. Weigh in the unit nameplate charge plus any charge required for line set differences over feet.
Refrigerant Charge per Line Set Length
Liquid Line
Set Diameter
Ounces per 5 feet (g per 1.5 m) adjust from 15 feet (4.6 m line set*
3/8” (9.5 mm) 3 ounces per 5' (85 g per 1.5 m)
NOTE - *If line length is greater than 15 feet (4.6 m), add this amount. If line length is less than 15 feet (4.6 m), subtract this amount.
Figure 15. HFC-410A Weigh In
Page 16
506 11/2012
This nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.
START: Measure outdoor ambient temperature
USE WEIGH‐IN METHOD
Weigh‐in or remove refriger ant based upon line length
If refrigerant is added or removed, verify charge using the
Subcooling Method .
If value is LESS than shown, add refrigerant.
64ºF and
BELOW
If value is MORE than shown, remove refrigerant.
MORE or
LESS
ABOVE or
BELOW
65ºF and
ABOVE
1. Confirm proper airflow across coil using figure 14.
2. Compare unit pressures with Table 3,
Normal Operating Pressures .
3. Set thermostat to call for heat (must have a cooling load between
70‐80ºF (21-26ºC).
4. Connect gauge set.
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.
APPº (Approach) Values(F:+/-1.0° [C: +/-0.6°])
ºF (ºC)* -036
Any 11 (6.1)
-042
9 (5.0)
-048
8 (4.4)
-060
9 (5.0)
*Temperature of air entering outdoor coil
Figure 16. HFC-410A Approach TXV Charge
START: Measure outdoor ambient temperature
ABOVE or
BELOW
65ºF and
ABOVE
64ºF and
BELOW
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.
If refrigerant is added or removed, verify charge using the
Approach Method .
If value is MORE than shown, remove refrigerant.
If value is LESS than shown, add refrigerant.
MORE or
LESS
1. Confirm proper airflow across coil using figure
2. Compare unit pressures with Table 3,
Normal
Operating Pressures .
3. Set thermostat to call for heat (must have a cooling load between 70‐80ºF (21-26ºC)
4. Connect gauge set
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 4):
SATº = ______
10. Subtract to determine subcooling (SCº):
SATº_____ - LIQº _____ = SCº _____
11. Compare results with table below.
SCº (Subcooling) Values (F:+/-1.0° [C: +/-0.6°])
ºF (ºC)* -036
Any 12 (6.7)
-042
9 (5.0)
-048
9 (5.0)
-060
7 (3.9)
*Temperature of air entering outdoor coil
Figure 17. HFC-410A Subcooling TXV Charge
Page 17
TSA*H4 SERIES
Table 3. HFC-410A Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
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 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.
TSA*H4 -036
5
F (
5
C)* Liquid / Suction
Expansion Valve (TXV)
65 (18)
70 (21)
263 / 135
281 / 138
75 (24)
80 (27)
85 (29)
90 (32)
95 (35)
100 (38)
105 (41)
110 (43)
115 (45)
302 / 140
325 / 142
349 / 142
375 / 143
404 / 144
433 / 145
462 / 147
494 / 149
527 / 150
-042
Liquid / Suction
238 /132
262 / 133
280 / 134
301 / 136
327 / 137
353 / 138
377 / 140
404 / 141
435 / 142
465 / 143
499 / 144
-048
Liquid / Suction
235 / 132
254 / 132
276 / 134
298 / 134
323 / 135
350 / 137
377 / 138
406 / 140
430 / 141
464 / 142
495 / 143
-060
Liquid / Suction
241 / 130
260 / 130
280 / 132
299 / 134
321 / 135
344 / 134
371 / 135
400 / 137
428 / 139
458 / 141
484 / 142
°F
10
15
20
-5
0
5
-40
-35
-30
-25
-20
-15
-10
25
30
35
40
45
50
55
Maintenance
°C
Table 4. HFC-410A Temperature (°F) - Pressure (Psig)
Psig °F °C
-20.6
-17.8
-15.0
-12.2
-9.4
-6.7
-40.0
-37.2
-34.4
-31.7
-28.9
-26.1
-23.3
-3.9
-1.1
1.7
4.4
7.2
10.0
12.8
42.5
48.6
55.2
62.3
70.0
78.3
11.6
14.9
18.5
22.5
26.9
31.7
36.8
87.3
96.8
107
118
130
142
155
95
100
105
110
115
120
60
65
70
75
80
85
90
125
130
135
140
145
150
35.0
37.8
40.6
43.3
46.1
48.9
15.6
18.3
21.1
23.9
26.7
29.4
32.2
51.7
54.4
57.2
60.0
62.8
65.6
Motor Nameplate :_________ Actual :__________.
Psig
295
317
340
365
391
418
170
185
201
217
235
254
274
446
476
507
539
573
608
6. Inspect drain holes in coil compartment base and clean if necessary.
NOTE ‐ If insufficient cooling occurs, the unit should be gauged and refrigerant charge should be checked.
DEALER
Maintenance and service must be performed by a qualified installer or service agency. At the beginning of each cooling season, the system should be checked as follows:
Outdoor Unit
1. Outdoor unit fan motor is pre-lubricated and sealed.
No further lubrication is needed.
2. Visually inspect all connecting lines, joints and coils for evidence of oil leaks.
3. Check all wiring for loose connections.
4. Check for correct voltage at unit (unit operating).
5. Check amp draw on outdoor fan motor.
Outdoor Coil
Clean and inspect outdoor coil (may be flushed with a water hose). Ensure power is off before cleaning.
NOTE — It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (e.g., pet urine, cottonwood seeds, fertilizers, fluids that may contain high levels of corrosive chemicals such as salts)
Page 18
506 11/2012
Sea Coast — Moist air in ocean locations can carry salt, which is corrosive to most metal. Units that are located near the ocean require frequent inspections and maintenance. These inspections will determine the necessary need to wash the unit including the outdoor coil.
Consult your installing contractor for proper intervals/procedures for your geographic area or service contract.
Indoor Unit
1. Clean or change filters.
2. Lennox blower motors are prelubricated and permanently sealed. No more 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 tables and procedure.
4.
Belt Drive Blowers - Check belt for wear and proper tension.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amp draw on blower motor.
Motor Nameplate :_________ Actual :__________.
Indoor Coil
1. Clean coil if necessary.
2. Check connecting lines, joints and coil for evidence of oil leaks.
3. Check condensate line and clean if necessary.
HOMEOWNER
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 outdoor unit. The following maintenance may be performed by the homeowner.
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.
Outdoor Coil
The outdoor unit must be properly maintained to ensure its proper operation.
Please contact your dealer to schedule proper inspection and maintenance for your equipment.
Make sure no obstructions restrict airflow to the outdoor unit.
Grass clippings, leaves, or shrubs crowding the unit can cause the unit to work harder and use more energy.
Page 19
Keep shrubbery trimmed away from the unit and periodically check for debris which collects around the unit.
Routine 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.
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.)
Thermostat Operation
See the thermostat homeowner manual for instructions on how to operate your thermostat.
Preservice Check
If your system fails to operate, check the following before calling for service:
Verify room thermostat settings are correct.
Verify that all electrical disconnect switches are ON.
Check for any blown fuses or tripped circuit breakers.
Verify unit access panels are in place.
Verify air filter is clean.
If service is needed, locate and write down the unit model number and have it handy before calling.
Accessories
For update-to-date information, see any of the following publications:
Lennox TSA*H4 Engineering Handbook
Lennox Product Catalog
Lennox Price Book
Cleaning Outdoor Coil
1. Make sure power is off before cleaning. Clean and inspect outdoor coil. The coil may be flushed with a water hose.
2. The outdoor coil is protected by an inner mesh screen
and a wire cage (see figure 18). If debris has collected
between the mesh screen and the coil and cannot be dislodged by spraying un-pressurized water from
TSA*H4 SERIES
inside coil surface to the outside, the mesh may be removed by first removing the top of the unit which will allow for removal of the wire cage.
3. Then, using pliers to grip the head of the push pins, pull straight out to extract the push pins along one side of the coil. If necessary, remove the push pins along the back of the unit; it is usually unnecessary to fully remove the inner mesh screen.
4. Drape the mesh screen back and wash the coil. When all the debris has been removed from the coil, reinstall the mesh screen by positioning it in its original position and reinserting the push pin. No tool is required to push the pin back into the same slot in the fins.
5. If the push pin is loose and tends not to stay in place, brush the fins with a fin brush (22 fins/in). Line up the push pin a couple fins to the right or left of the original hole and re-insert the pin.
9 PINS USED ON -048
AND -060; 6 PINS ALL
OTHERS
ÂÂÂÂÂÂÂÂÂÂÂ
ÂÂÂÂÂÂÂÂÂÂÂ
ÂÂÂÂÂÂÂÂÂÂÂ
PUSH PIN
ÂÂÂÂÂÂÂÂÂÂÂ
MESH SCREEN
ÂÂÂÂÂÂÂÂÂÂÂ
ÂÂÂÂÂÂÂÂÂÂÂ
Figure 18. Cleaning Debris from Mesh
Start-Up and Performance Checklist
Job Name
Job Location
Installer
Unit Model No.
Job no.
City
City
Serial No.
Nameplate Voltage
Rated Load Ampacity Compressor
Maximum Fuse or Circuit Breaker
Electrical Connections Tight?
Indoor Blower RPM
Indoor Filter clean?
S.P. Drop Over Indoor (Dry)
Discharge Pressure Suction Pressure
Date
State
State
Service Technician
Outdoor Fan
Supply Voltage (Unit Off)
Outdoor Coil Entering Air Temp.
Refrigerant Charge Checked?
Refrigerant Lines: Leak Checked?
Service Valves: Fully Opened?
Voltage With Compressor Operating
Properly Insulated?
Caps Tight?
Outdoor Fan Checked?
Thermostat
Calibrated? Properly Set? Level?
Page 20
506 11/2012
advertisement
Related manuals
advertisement