LENNOX CB28UH-018-024 Upflow Position With Optional Electric Heat Instruction Manual

LENNOX CB28UH-018-024 Upflow Position With Optional Electric Heat

Product Information

Specifications:

• Manufacturer: Lennox Industries Inc.
• Model: CB28UH
• Position: Upflow
• Optional Feature: Electric Heat

Product Usage Instructions:

General
The CB28UH Series Units are up-flow horizontal blower coil units manufactured by Lennox Industries Inc. These units are designed for specific installation requirements and provide heating and cooling functionality.

Shipping & Packing List
Upon receiving the CB28UH Series Unit, check the shipping and packing list to ensure all components are included and there is no shipping damage. Contact the carrier immediately if any damage is found.

Unit Dimensions
The CB28UH Series Units are available in different sizes:

Requirements
Before installation, ensure you meet the following requirements:

• Comply with local codes and regulations
• Consult authorities having jurisdiction

Installation
Follow the installation instructions provided by Lennox Industries Inc. Ensure proper placement and secure mounting of the unit.

Field Piping Connections
Make the necessary field piping connections according to the unit’s piping plate details.

Condensate Drain
Install the condensate drain following the specified guidelines. Refer to the diagrams for the appropriate drain locations.

Filters
Access the filters for cleaning or replacement. Refer to the filter access details provided in the manual.

Sealing the Unit
Ensure proper sealing of the unit to prevent any air leaks. Follow the instructions provided by Lennox Industries Inc.

Blower Speed Adjustments
Adjust the blower speed as needed using the instructions provided in the manual.

Electrical
Refer to the system wiring diagrams for proper electrical connections. Follow all safety precautions when working with electrical components.

Frequently Asked Questions (FAQ)

• Q: Are these instructions applicable worldwide?
  A: These instructions are intended as a general guide and may not comply with local codes and regulations. Consult authorities having jurisdiction before installation.

• Q: What should I do if I find shipping damage?
  A: Immediately contact the last carrier and report the damage.

• Q: How do I adjust the blower speed?
  A: Follow the blower speed adjustment instructions provided in the manual.

• Q: Where can I find the system wiring diagrams?
  A: The system wiring diagrams are available in the manual provided by Lennox Industries Inc.

CB28UH Series Units

The Lennox Merite CB28UH series blower coil units are designed for installation with optional field-installed electric heat and a matched remote outdoor unit. These units are for indoor installation only. The CB28UH units are designed for up-flow/horizontal positional installations and are shipped (completely as-sembled) from the factory for up-flow and horizontal right-hand discharge.

General

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. Check equipment for shipping damage. If you find any damage, immediately contact the last carrier.

Shipping and Packing List

CB28UH Series
Package 1 of 1 contains

1. Assembled blower coil unit

IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of refrigerants (CFCs and HCFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for non- compliance.

WARNING
Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance, or repair will expose you to fiberglass wool. 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

Upflow Unit Dimensions – inches (mm)

Torque Table

Horizontal Left- and Right-Hand Unit Dimensions • inches (mm)

CB28UH HORIZONTAL POSITION
(LEFT-HAND AIR DISCHARGE)

45-1/4

| ****

1149

| ****

16-1/4

| ****

413

| ****

20-5/8

| ****

524

| ****

14-3/4

| ****

375

| ****

19

| ****

483

| ****

15

| ****

351

CB28UH-036 CB28UH-042| ****

49-1/4

| ****

1251

| ****

21-1/4

| ****

540

| ****

20-5/8

| ****

524

| ****

19-3/4

| ****

502

| ****

19

| ****

483

| ****

20

| ****

508

CB28UH-048 CB28UH-060| ****

52-1/2

| ****

1334

| ****

21-1/4

| ****

540

| ****

22-5/8

| ****

575

| ****

19-3/4

| ****

502

| ****

21

| ****

533

| ****

20

| ****

508

Requirements

Installation of Lennox blower coil units with or without optional electric heat must conform with standards in the National Fire Protection Association (NFPA) “Standard for Installation of Air Conditioning and Ventilation Systems NFPA No. 90A,” and “Standard for Installation of ResidenceType Warm Air Heating and Air Conditioning Systems NFPA No. 908,” manufacturer’s installation instructions and local municipal building codes. This unit is certified for installation clearances to combustible material as listed on the unit rating plate.

Installation

CB28UH units are factory-configured for upflow or horizontal right-hand discharge installation. For horizontal left-hand discharge, some field modification is required.

CAUTION
The danger of sharp metallic edges. Can cause injury.
Take care when servicing the unit to avoid accidental contact with sharp edges.

Upflow Application

1. Remove access panel. Remove corrugated padding from the space between the blower and coil assemblies.
2. To ensure proper operation, remove the horizontal drain pan from units in upflow configurations.
3. Place unit in desired location. Make sure that unit is level. Connect return and supply air plenums as required using sheet metal screws. See Figure 1.
4. Mount units that have no return air plenum on a stand at least 14″ from the floor for proper air return. Lennox offers an optional upflow unit stand. (45K31 for CB28UH-018, 024, 030; 45K32 for CB28UH-036 through -060.)

Horizontal Right-Hand Discharge Application

1. Remove the access panel. Remove corrugated padding from the space between the blower and coil assembly.

2. No further adjustment is necessary. Set unit so that it is sloped 1/4 inch toward the drain pan end of the unit.
   NOTE – For horizontal applications, an auxiliary drain pan is required. Refer to local codes.
   NOTE – For horizontal applications in high humidity areas, seal around the exiting drain pipe, liquid line and suction line to prevent infiltration of humid air.

3. If the unit is to be suspended, it must be supported along the entire length of the cabinet. If you use a strap, attach a piece of angle iron or sheet metal to the unit (either above or below) so that the full length of the cabinet is supported. Use securing screws which are no longer than 1/2 inch to avoid damaging the coil or filter. See Figure 3. Connect the return and supply air plenums as required using sheet metal screws. CAUTION Danger in equipment damage and personal injury. Take care when removing coil assembly from units installed in right or left-hand applications. The coil may tip into the drain pan once clear of the cabinet. Support coil when removing.

Horizontal Left-Hand Discharge Application
NOTE – For horizontal applications, an auxiliary drain pan is required. Refer to local codes.

1. Remove the access panel. Remove corrugated padding from the space between the blower and coil assembly before operation.

2. Pull the coil assembly from the unit Pull off the horizontal drain pan.

3. Remove drain plugs from the back drain holes on the horizontal drain pan and reinstall them on the front holes.

4.  Rotate the drain pan 180° front to back and install it on the opposite side of the coil. Follow the instruction steps with the corresponding numbers in Figure 4.

5. Remove screws from the top cap. Remove the horizontal drip shield screw located in the center of the back coil end seal. See Figure 4.

6. Rotate horizontal drip shield 180° front to back.

7. Remove the plastic plug from the left hole on the coil front end seal and reinstall the plug in the back hole. Re-install horizontal drip shield screw in front coil end seal. The drip shield should drain downward into the horizontal drain pan inside the coil. See Figure 4.

8. Rotate the top cap 180° front to back and align it with unused screw holes. Holes must align with front and back coil end plates. Note that the top cap has a 45° bend on one side and a go0 bend on the other. The 90° bend must be on the same side as the horizontal drain pan. See Figures 4 and 5.
   NOTE – Use extreme care when re-installing screws into coil end plate engaging holes. Misaligned screws may damage the coil.

9. Remove the condensate shield from the right front and install it on the left front as shown in figure 4.

10. From the upflow position, flip cabinet go0 to the left and set into place. Put coil assembly back in place. Secure coil in place by putting the cabinet support rail back in place. See figures 4 and 6. NOTE – For horizontal applications in high humidity areas, seal around the exiting drain pipe, liquid line, and suction line to prevent infiltration of humid air.

11.  Knock out the drain seal plate from the access door. Secure plate to cabinet front flange with screw provided.

12. Flip the access door and replace it on the unit.

13. Set the unit so that it is sloped 1/4 inch toward the drain pan end of the unit. Connect return and supply air plenums as required using sheet metal screws.

14. If you are going to suspend the unit, the entire length of the cabinet must be supported. If you use a chain or strap, attach a piece of angle iron or sheet metal to the unit ( either above or below it), so that the full length of the cabinet is supported. Use securing screws which are no longer than 1/2 inch to avoid damaging the coil or filter. See Figure 3. Use sheet metal screws to connect the return and supply air plenums.

Field Piping Connections

All CB28UH coils are equipped with a factory-installed, internally mounted expansion valve. Use Lennox L 15 (sweat) series line sets as shown in table 1 or use fieldfabricated refrigerant lines. L 10 (flare) line sets may be used by cutting off flare nut. Refer to the piping section of the Lennox Unit Information Service Manual for proper size, type and application of field- fabricated lines.

TABLE 1
REFRIGERANT LINE KITS

CB28UH UNIT| LIQUID LINE| VAPOR LINE| L15 LINE SETS
---|---|---|---

-018/-024

| ****

3/8 in (8mm)

| ****

5/8 in (16mm)

| L15-26

20 ft. – 50 ft.

(6 m-15 m)

-030/-036

| ****

3/8 in (10mm)

| ****

3/4 in. (19mm

| L15-41

20 ft. – 50 ft.

(6 m-15 m)

-042/-048

| ****

3/8 in (10mm)

| ****

7/8 in. (22mm)

| L15-65

30 ft. – 50 ft.

(9 m-15 m)

-060

| 3/8 in (10mm)| 1-1/8 in. (29mm)| FIELD FABRICATED

NOTE – CB28UH series evaporators use nitrogen or dry air as a holding charge. If there is no pressure when the rubber plugs are removed, check the coil or line set for leaks before installing. After installation, pull a vacuum on the line set and coil before releasing the unit charge into the system.

1. Use a wet rag to protect the TXV bulb (or remove it) when brazing the suction line.
2. Be aware of the filter access panel when connecting lines. The filter must be accessible.
3. Place heat shield (damp rag) against the piping plate and around the suction line connection. A heat shield must be in place to guard against damage to the paint.
4. With a heat shield in place, sweat in the suction line connection to the line set. After the procedure is completed, remove the heat shield.
5. Place the heat shield against the piping plate and around the liquid line connection. Sweat in the liquid line connection to the line set.
6. Refer to the instructions provided with the outdoor unit for leak testing, evacuating, and charging procedures.

Condensate Drain

Connect main condensate drain and route downward to an open drain or sump. Do not connect the drain to a closed waste system. Refer to figure 7 for a typical condensate trap configuration.

It is recommended that the auxiliary drain be connected to a drain line for all units. If an auxiliary drain is not connected, it must be plugged with the provided cap. See figure 8 for auxiliary and main drain locations.

The following practices are recommended to ensure condensate removal:

1. Drain piping should not be smaller than the drain connections at the drain pan.
2. A trap must be installed in the main drain line.
3. The trap must be deep enough to offset the difference in static pressure between the drain pan and the atmosphere. Generally, two inches is satisfactory for medium static applications.
4. Horizontal runs must be sloped 1 inch per 10 feet of drain line to offset friction.
5. An open vent in the drain line will sometimes be required to prevent vapor lock.
6. Drains should be constructed in a manner to facilitates future cleaning and not interfere with filter access. See figure 7.
7. The auxiliary drain should run to an area where a homeowner will notice it draining. Refer to local codes.
8. All drain connections that are not used during installation must be plugged and properly torqued to 7 ft. lbs. to prevent leaks.

Filters

IMPORTANT
Filter access panels must be in place during unit operation. Excessive warm air entering the unit may result in water blow-off problems.

• Each unit includes a factory-installed filter. Note that the filter access cover fits over the access panel.
• Filters should be inspected monthly and must be cleaned or replaced when dirty to ensure proper operation.
• This unit is equipped with standard throw-away type filters which should be replaced when they become dirty.
• To remove the filter, take off the filter access door, slide the filter out of the guides on either side of the cabinet, insert a new filter, and replace the filter access door. See Table 2 for replacement filter sizes.

TABLE 2
FILTER DIMENSIONS

UNIT MODEL NO.| FILTER SIZE

Inches (mm)

---|---
CB28UH-018/-024| 15 X 20(381 X 508)
CB28UH-030/-042| 20 X 20(508 X 508)
CB28UH-048/-060| 20 X 22(508 X 559)

Sealing the Unit

It is very important to seal the unit so that warm air is not allowed into the cabinet. Warm air introduces moisture, which results in condensation problems. This is especially important when the unit is installed in an unconditioned area. Make sure the liquid line and suction line entry points are sealed with either the provided material or with Permagum. Permagum may also be used to seal around the main and auxiliary drains and around open areas of electrical inlets.

Blower Speed Adjustments

Minimum Blower Speeds (With Electric Heaters)
For the minimum allowable speed for the CB28UH series units with electric heat, refer to the ECB29 installation instructions.

Air Volume Adjustment
Blower speed selection is accomplished by changing the taps at the harness connector at the blower motor. Refer to unit wiring diagram in figure 9. Refer to tables 3 through 8 for blower performance data.

TABLE 3
CB28UH-018/024 BLOWER PERFORMANCE (208/230v)

External Static Pressure| Air Volume and Motor Watts at Specific Blower Taps
---|---
Low| Medium| High
in. w.g.| Pa| cfm| Lis| Watts| cfm| Lis| Watts| cfm| Lis| Watts
.00| 0| 700| 330| 245| 895| 420| 310| 1030| 485| 375
.05| 10| 690| 325| 240| 875| 415| 305| 1010| 475| 370
.10| 25| 680| 320| 235| 865| 410| 300| 990| 470| 365
.15| 35| 665| 315| 230| 850| 400| 290| 970| 460| 355
.20| 50| 655| 310| 225| 830| 390| 285| 955| 450| 350
.25| 60| 640| 300| 220| 810| 385| 280| 925| 440| 345
.30| 75| 625| 295| 220| 795| 375| 270| 900| 425| 335
40| 100| 595| 280| 210| 750| 355| 255| 850| 400| 320
.50| 125| 555| 260| 195| 700| 330| 240| 800| 380| 305
.60| 150| 510| 240| 185| 640| 300| 225| 725| 340| 290
.70| 175| 395| 185| 165| – –| –|  | 620| 295| 265
.75| 185| – – – –| – – – –| – – – –| – – – –| – – – –| – – – –| 570| 270| 255

NOTE All air data 1s measured external to burnt with air filter 1n place. Electric heaters have no appreciable air resistance

TABLE4
CB28UH-030 BLOWER PERFORMANCE (208/230v)

NOTE All air data 1s measured external to the unit with air filter 1n place_ Electric heaters have no appreciable air resistance

TABLE 5
CB28UH-036 BLOWER PERFORMANCE (208/230v) NOTE All air data 1s measured external to unit with air filter 1n place_ Electric heaters have no appreciable air resistance

TABLE 6
CB28UH-042 BLOWER PERFORMANCE (208/230v)

NOTE All air data 1s measured external to unit with air fdter 1n place. Electric heaters have no appreciable air resistance

TABLE 7
CB28UH-048 BLOWER PERFORMANCE (208/230v)

External Static Pressure| Air Volume and Motor Watts at Specific Blower Taps
---|---
Low| Medium| High
in. w.g.| Pa| cfm| Lis| Watts| cfm| Lis| Watts| cfm| Lis| Watts
.00| 0| 1590| 750| 665| 1790| 845| 805| 2055| 970| 1005
.05| 10| 1570| 740| 660| 1770| 835| 790| 2035| 960| 995
.10| 25| 1555| 735| 655| 1750| 825| 785| 2005| 945| 980
.15| 35| 1530| 720| 645| 1730| 815| 775| 1980| 935| 970
.20| 50| 1510| 710| 640| 1710| 805| 765| 1945| 920| 955
.25| 60| 1485| 700| 635| 1685| 795| 755| 1915| 905| 940
.30| 75| 1460| 690| 625| 1660| 785| 745| 1885| 890| 930
40| 100| 1415| 670| 615| 1610| 760| 725| 1820| 860| 900
.50| 125| 1370| 645| 600| 1550| 730| 705| 1750| 825| 875
.60| 150| 1310| 620| 580| 1490| 705| 685| 1670| 790| 845
.70| 175| 1240| 585| 560| 1405| 665| 660| 1575| 745| 820
.75| 185| 1210| 570| 550| 1360| 640| 645| 1520| 720| 800

NOTE all air data 1s measured external to unit with air filter 1n place_ Electric heaters have no appreciable air resistance

TABLE 8
CB28UH-060 BLOWER PERFORMANCE (208/230v)

External Static Pressure| Air Volume and Motor Watts at Specific Blower Taps
---|---
Low| Medium-Low| Medium| Medium-High| High
in.w.g.| Pa| cfm| Lis| Watts| cfm| Lis| Watts| cfm| Lis| Watts| cfm| Lis| Watts| cfm| Lis| Watts
.00| 0| 1570| 740| 575| 1800| 850| 700| 2005| 945| 825| 2135| 1005| 930| 2245| 1060| 1080
.05| 10| 1550| 730| 570| 1780| 840| 690| 1980| 935| 815| 2110| 995| 925| 2220| 1050| 1070
.10| 25| 1530| 725| 560| 1760| 830| 680| 1950| 920| 805| 2080| 985| 915| 2190| 1035| 1060
.15| 35| 1520| 715| 560| 1735| 820| 670| 1930| 910| 795| 2055| 970| 905| 2165| 1020| 1050
.20| 50| 1495| 705| 550| 1710| 805| 660| 1910| 900| 790| 2025| 955| 895| 2135| 1010| 1040
.25| 60| 1475| 695| 545| 1690| 795| 655| 1880| 890| 780| 1995| 940| 885| 2105| 995| 1030
.30| 75| 1460| 690| 540| 1670| 785| 650| 1855| 875| 770| 1965| 930| 875| 2075| 980| 1020
A| 100| 1415| 670| 530| 1615| 760| 630| 1795| 850| 750| 1910| 900| 855| 2005| 945| 995
.50| 125| 1370| 645| 520| 1560| 735| 615| 1735| 820| 730| 1850| 875| 835| 1935| 910| 975
.60| 150| 1310| 620| 505| 1495| 705| 595| 1670| 790| 710| 1780| 840| 810| 1855| 875| 950
.70| 175| 1250| 590| 490| 1425| 675| 575| 1600| 755| 690| 1705| 805| 785| 1780| 840| 925
.80| 200| 1175| 555| 470| 1360| 640| 560| 1520| 715| 665| 1620| 765| 755| 1685| 795| 900
.90| 225| 1025| 485| 440| 1280| 605| 545| 1420| 670| 645| 1520| 715| 725| 1595| 750| 875
.95| 235| – – – –| – – – –| – – – –| 1240| 585| 535| 1365| 645| 630| 1460| 690| 705| 1545| 730| 860

NOTE All air data is measured external to the unit with the air filter in place. Electric heaters have no appreciable air resistance.

Electrical

WARNING USE COPPER CONDUCTORS ONLY.

Wiring must conform to the current National Electric Code ANSI/NFPA No. 70, or Canadian Electric Code Part I, CSA Standard C22.1, and local building codes. Refer to the following wiring diagrams. See unit nameplate for minimum circuit ampacity and maximum overcurrent protection size Select the proper supply circuit conductors per tables 310-16 and 310-17 in the National  Electric Code, ANSI/NFPA No. 70 or tables 1 through 4 in the Canadian Electric Code, Part I, CSA Standard  C22.1. This unit is provided with knockout for conduit. Refer to Figure 9 for the unit schematic wiring diagram. Separate openings have been provided for 24V low voltage and line voltage. Refer to the dimension illustration for the specific location.

WARNING
Run 24V Class II wiring only through specified low voltage openings. Run line voltage wiring only through specified high voltage opening. Do not combine voltage in one opening.

System Wiring Diagrams

HEAT PUMP-ONLY APPLICATION

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