Bosch Multi-Position Cased Coils

Cooling and Heat Pump Compatible

BMAC Series

Installation Manual

2 | Bosch Multi-Position Cased Coils Installation Manual

Data subject to change 04.2023 | Bosch Thermotechnology Corp.

Installation Manual Bosch Multi-Position Cased Coils | 3

Table of Contents

1 Key to symbols and safety instructions

1.2 Safety

2 General

2.1 Codes & regulations

2.2 Inspection upon unit arrival

2.3 Clearances

2.4 Dimensional data

3 Installation Instructions

3.1 Parts

3.2 Pre-installation instructions

3.3 Installation and trap connection

4 Drain application

4.1 Condensate drain piping

4.2 Plastic drain pan installation

5 Refrigerant connections

5.1 Airflow performance [CFM vs pressure drop]:

6 TXV replacement information

12

12

10

10

10

9

9

9

9

14

5

5

6

5

5

4

4

Bosch Thermotechnology Corp. | 04.2023

Data subject to change

4 | Bosch Multi-Position Cased Coils Installation Manual

1 Key to symbols and safety instructions

1.1 Key to symbols

Warnings

Warnings in this document are identified by a warning triangle printed against a grey background.

Keywords at the start of a warning indicate the type and seriousness of the ensuing risk if measures to prevent the risk are not taken.

The following keywords are defined and can be used in this document: f DANGER i ndicates a hazardous situation which, if not avoided, will result in death or serious injury.

f WARNING indicates a hazardous situation which, if not avoided, could result in death or serious injury.

f CAUTION indicates a hazardous situation which, if not avoided, could result in minor to moderate injury.

f NOTICE is used to address practices not related to personal injury.

Important information

This symbol indicates important information where there is no risk to people or property.

1.2 Safety

Please read safety precautions before installation

WARNING: f These instructions are intended as an aid to qualified licensed service personnel for proper installation, adjustment and operation of this unit. Read these instructions thoroughly before attempting installation or operation. Failure to follow these instructions may result in improper installation, adjustment, service or maintenance and possibly resulting in fire, electrical shock, property damage, personal injury or death.

WARNING: f Disconnect all power to the unit before starting any service and maintenance. Failure to do so could cause severe electrical shock resulting in personal injury or death.

WARNING: INSTALLATION REQUIREMENTS f Installation or servicing of this unit can be hazardous due to parts, compo - nents and system pressure. Qualified and proper trained service personnel should perform installation and repai r . Failure to do so could cause severe electrical shock resulting in personal injure or death.

Data subject to change 04.2023 | Bosch Thermotechnology Corp.

Installation Manual Bosch Multi-Position Cased Coils | 5

2 General

These coils are approved for upflow or downflow, vertical and horizontal installation.

For furnace applications, the coil must be installed downstream (in the air outlet) of the furnace.

2.1 Codes & regulations

This product is designed and manufactured to comply with national codes.

Installation in accordance with such codes and/or prevailing local codes/regulations is the responsibility of the installer . The manufacturer assumes no responsibility for equipment installed in violation of any codes or regulations.

The United States Environmental Protection Agency (EPA) has issued various regulations regarding the introduction and disposal of refrigerants. Failure to follow these regulations may harm the environment and can lead to the imposition of substantial fines. Should you have any questions please contact the local office of the EPA.

2.2 Inspection upon unit arrival

As soon as unit is received, it should be inspected and noted for possible shipping damage during transportation. It is carrier ’s responsibility to cover the cost of shipping damage. Manufacturer or distributor will not accept a claim from contractors for any transportation damage.

2.3 Clearances

Following clearances should be provided during installation:

1. Maintenance and service access, including coil cleaning and coil assembly removal

2. Refrigerant piping and connections

3. Condensate drain line

For ensure the proper installation, Select a solid and level site. Ensure enough space required for installation and maintenance. ıʾ

Front of unit ıʾ

Figure 2 Clearance - top view (including air duct) ı ıʾ

AIRFLOW

Figure 1 Clearance -front view (including air duct)

Bosch Thermotechnology Corp. | 04.2023

Data subject to change

6 | Bosch Multi-Position Cased Coils Installation Manual

2.4 Dimensional data

A

1 9 ”

V APOR LINE CONNECTION

COPPER (SWE A T)

LIQUID LINE CONNECTION

AUXILIA RY DRAIN CONNECTION

3/4'' NP T FEMALE PIPE THREAD

W 1

2 0

' '

2 1 ”

COI L ACCESS

P ANE L

H PRIMA RY DRAIN

CONNETION

3/4'' NP T FEMALE

PIPE THREAD

AUXILIA RY DRAIN

CONNECTION

3/4'' NP T FEMALE

PIPE THREAD

W

PRIMA RY DRAIN CONNETION

3/4'' NP T FEMALE PIPE THREAD

T O P AIR S T O P

LIQUID LINE CONNECTION

AUXILIA R Y DRAIN CONNECTION

3/4'' NP T FEMALE PIPE THREAD

Figure 3

Model

BMAC2430ANTD

BMAC2430BNTD

BMAC3036ANTD

BMAC3036BNTD

BMAC3036CNTD

Table 1

Unit Height "H"

20 [508]

20 [508]

20 [508]

20 [508]

20 [508]

Unit Width "W"

14½ [368]

17½ [445]

14½ [368]

17½ [445]

21 [553]

Dimensions inch [mm]

Supply Duct "A"

13 [330]

16 [407]

13 [330]

16 [407]

19½ [495]

"W1"

13½ [343]

16½ [419]

13½ [343]

16½ [419]

20 [508]

Liquid line /Vapor Line

⅜ / ¾

⅜ / ¾

⅜ / ¾

⅜ / ¾

⅜ / ¾

Weight /Shipping

(LBS [kg])

45.6/62.1 [20.7/28.2]

48/66 [21.8/29.9]

45.6/62.1 [20.7/28.2]

48/66 [21.8/29.9]

51.8/74.3 [23.5/33.7]

Data subject to change 04.2023 | Bosch Thermotechnology Corp.

Installation Manual Bosch Multi-Position Cased Coils | 7

A

1 9 ”

V APOR LINE CONNECTION

COPPER (SWE A T)

LIQUID LINE CONNECTION

AUXILIA RY DRAIN CONNECTION

3/4'' NP T FEMALE PIPE THREAD

2 1

”

2

W

0

' '

1

T O P AIR S T O P

V APOR LINE CONNECTION

LIQUID LINE CONNECTION

AUXILIA R Y DRAIN CONNECTION

3/4'' NP T FEMALE PIPE THREAD

COI L ACCESS

P ANE L

H PRIMA RY DRAIN

CONNETION

3/4'' NP T FEMALE

PIPE THREAD

AUXILIA RY DRAIN

CONNECTION

3/4'' NP T FEMALE

PIPE THREAD

W

PRIMA RY DRAIN CONNETION

3/4'' NP T FEMALE PIPE THREAD

Figure 4

Model

BMAC4248BNTF

BMAC4248CNTF

BMAC4248DNTF

Table 2

Unit Height "H"

30 [762]

30 [762]

30 [762]

Unit Width "W"

17½ [445]

21 [533]

24½ [622]

Dimensions inch [mm]

Supply Duct "A"

16 [407]

19½ [495]

23 [584]

"W1"

16½ [419]

20 [508]

23½ [597]

Liquid line /Vapor Line

⅜ /⅞

⅜ /⅞

⅜ /⅞

Weight /Shipping

(LBS [kg])

74.3/93.2 [33.7/42.3]

74.3/97.8 [33.7/44.4]

78/102.9 [35.4/46.7]

Bosch Thermotechnology Corp. | 04.2023

Data subject to change

8 | Bosch Multi-Position Cased Coils Installation Manual

A

1

9 ”

V APOR LINE CONNECTION

COPPER (SWE A T)

LIQUID LINE CONNECTION

AUXILIA RY DRAIN CONNECTION

3/4'' NP T FEMALE PIPE THREAD

2 1 ”

W 1

2 0

' '

T O P AIR S T O P

V APOR LINE CONNECTION

LIQUID LINE CONNECTION

AUXILIA R Y DRAIN CONNECTION

3/4'' NP T FEMALE PIPE THREAD

COI L ACCESS

P ANE L

H PRIMA RY DRAIN

CONNETION

3/4'' NP T FEMALE

PIPE THREAD

AUXILIA RY DRAIN

CONNECTION

3/4'' NP T FEMALE

PIPE THREAD

W

PRIMA RY DRAIN CONNETION

3/4'' NP T FEMALE PIPE THREAD

Figure 5

Model

BMAC4860CNTF

BMAC4860DNTF

Table 3

Unit Height "H"

30 [762]

30 [762]

Unit Width "W"

21 [533]

24½ [622]

Dimensions inch [mm]

Supply Duct "A"

19½ [495]

23 [584]

"W1"

20 [508]

23½ [597]

Liquid line /Vapor Line

⅜ /⅞

⅜ /⅞

Weight /Shipping

(LBS [kg])

83/106.7 [37.6/48.4]

86.4/111.3 [39.2/50.5]

Data subject to change 04.2023 | Bosch Thermotechnology Corp.

Installation Manual Bosch Multi-Position Cased Coils | 9

3 Installation Instructions

3.1 Parts

Contact your distributor for authorized replacement parts.

Furnace

Right Hand

Discharge

3.2 Pre-installation instructions

Carefully read all instructions for installation prior to installing product. Make sure each step or procedure is understood and any special considerations are taken into account before starting installation. Assemble all tools, hardware and supplies needed to complete the installation. Some items may need to be purchased locally.

Make sure everything needed to install the product is on hand before starting.

Horizontal Drain

3.3 Installation and trap connection

1. See Fig.6 & 7 for coil installation and drain connection.

2. Installation steps for cased coil:

A. Shut off or disconnect gas furnace’s power and remove gas pipe if necessary.

B. Disconnect and remove a sufficient portion of the supply ductwork to provide clearance for the cased coil.

C. Ensure that the coil is level. Seal the gap between coil and furnace.

See Figure 6 & 7. In case that coil and furnace sizes are not matched, use proper size of sheet metal or other material to fill the gap and seal the gap to prevent air leak

Figure 7

Left Hand

Discharge

Furnace

Horizontal Drain

Horizontal Drain Conditions

(All other drain connections should be plugged)

D. Reconnect the ductwork to the coil case, and seal any leakage.

E. Reconnect power line on gas furnace, turn on the furnace to check any sign of leakage.

Primary Drain

Alternate Drain

Upflow Discharge

↑↑

Figure 6

Primary Drain

Upflow Drain Connection

Alternate Drain

Downflow Drain Connection

V ertical Drain Conditions

(All other drain connections should be plugged)

Bosch Thermotechnology Corp. | 04.2023

Data subject to change

1 0 | Bosch Multi-Position Cased Coils Installation Manual

4 Drain application

4.1 Condensate drain piping

Consult local codes for special requirements.

To provide extra protection from water damage, it is always recommended to install an additional drain pan, provided by installer, under the entire unit with a separate drain line. Manufacturer will not be responsible for any damages due to the failure to follow these recommendations.

4.2 Plastic drain pan installation

WARNING: f Do not use the coil pan shipped with the unit on OIL furnaces or any application where the temperature of the drain pan may exceed 275 °F . A field fabricated metal drain pan can also be used for these type of applications. Failure to follow this warning may result in property damage and/or personal injury.

The coil drain pan has a primary and an optional secondary drain with 3/4” NP T female connections; use either PVC or copper pipe and hand tighten to a torque of approximately 37 in-lbs. to prevent damage to the drain pan connection. An insertion depth between .355 to .485 inches (3-5 turns) should be expected at this torque setting.

Use male 3/4” NPT threaded fitting for outside connection and make sure the drain holes are not blocked.

Insulation may be needed for drain line to prevent sweating.

Drain pan has two drain connections on each side to provide flexibility of connection and drainage. Make sure pan has proper pitch and plugged if second connection is not used.

If the secondary drain line is required, run the line separately from the primary drain and terminate it where it can be easily seen.

Water coming from this line means the coil primary drain is plugged and needs clearing.

Install a trap in the drain line below the bottom of the drain pan. If using a copper drain line, solder a short piece of pipe to the connector before installing a drain fitting. DO NO T over torque the 3/4” copper connector to the plastic drain connection. Use a wet rag or heatsink material on the short piece to protect plastic drain pan, complete the drain line installation (Fig.8 ). Use (Fig.9) as a template for typical drain pipe routing. This figure shows how to avoid interference with vent piping.

Data subject to change 04.2023 | Bosch Thermotechnology Corp.

Installation Manual Bosch Multi-Position Cased Coils | 11

CONDENS A TE DRAIN TRA P

The condensate trap is not mandatory but is recommended for e f ficienc y .

Unit

DO NO T OVE R TIGHTEN DRAIN FITTING

UNI T MUS T BE SLIGHT L Y INCLINED

T O W ARD DRAIN CONNECTION

T O APPROVED DRAIN

Figure 8 secondary primary secondary primary

Figure 9

Bosch Thermotechnology Corp. | 04.2023

Data subject to change

1 2 | Bosch Multi-Position Cased Coils Installation Manual

5 Refrigerant connections

NOTICE: f Gently remove the sealing plug of vapor line, use one wrench to fix the valve base, loosen the nut with another wrench,take out the flange pad and and sealing ring. The nitrogen pressure is about 10 PSIG.

To prevent refrigerant leak, use proper tools to ensure clean, burr-free cut.

NOTICE: f TXV bulb MUST be protected (wrapped with wet rag) or removed, while brazing the tubing. Overheating of the sensing bulb will affect the functional characteristics and performance of the comfort coil.

Use brazing shield when brazing close to the cabinet surface and wet rag to protect rubber grommet. Brazing alloy should be at least 5% silver content.

5.1 Airflow performance [CFM vs pressure drop]:

Model

BMAC2430ANTD

BMAC2430BNTD

BMAC2430CNTD

BMAC3036ANTD

BMAC3036BNTD

BMAC3036CNTD

BMAC4248BNTF

BMAC4248CNTF

BMAC4248DNTF

BMAC4860CNTF

BMAC4860DNTF

360

456

505

533

439

466

0.05

307

327

360

307

327

585

638

726

857

699

764

0.1

485

527

585

485

527

748

810

932

1105

906

978

0.15

618

682

748

618

682

Table 2 Pressure drop for cooling and heat pump coils

*Data based on wet coil with entering air at 80°F DB / 67°F WB without air filter.

Pressure Drop (Inches of Water)

0.2

0.25

729 823

810

893

729

810

925

1019

823

925

893

953

1098

1319

1071

1157

1019

1077

1244

1509

1224

1313

1132

1191

1375

1675

1362

1466

0.3

911

1024

1132

911

1024

1238

1284

1494

1824

1487

1590

0.35

991

1122

1238

991

1122

1348

1390

1604

1956

1589

1695

0.4

1063

1217

1348

1063

1217

Data subject to change 04.2023 | Bosch Thermotechnology Corp.

Model / Coil

BMAC2430ANTD

BMAC2430BNTD

BMAC2430CNTD

BMAC3036ANTD

BMAC3036BNTD

BMAC3036CNTD

BMAC4248BNTF

BMAC4248CNTF

BMAC4248DNTF

BMAC4860CNTF

BMAC4860DNTF

Table 3

Installation Manual Bosch Multi-Position Cased Coils | 13

Water blow-off could occur in certain installation positions if the airflow setting exceeds the maximum values listed.

Upflow

1125

1125

1250

1200

1250

1250

1800

1800

1800

1850

2000

Maximum airflow setting,CFM

Horizontal Left

1050

1050

1200

1050

1200

1200

1800

1800

1800

1850

2000

Downflow

1050

1050

1050

1050

1050

1050

1700

1700

1700

1750

1850

Horizontal Right

1125

1125

1250

1200

1250

1250

1500

1700

1800

1750

1850

Bosch Thermotechnology Corp. | 04.2023

Data subject to change

1 4 | Bosch Multi-Position Cased Coils Installation Manual

6 TXV replacement information

The TXV replacement options noted in this sheet supersede those in the installation guide. Please reference this sheet for all refrigerant metering options.

WARNING: f Wrap the TXV and coil panel with a wet rag to prevent overheating while brazing; and use a shield plate to prevent the fire and copper pollution.

1. Remove the screws and front coil panel.

2. Remove the rubber plugs from the liquid and vapor lines.

3. Remove relevant ties and pipe insulation.

4. Unwrap and remove the TXV sensing bulb.

5. Remove the equalizer tube from vapor pipe. Wrap the TXV and coil panel with a wet rag to prevent overheating while brazing. Use a shield plate to prevent the copper pollution.

6. Disconnect the input pipe ,Wrap the TXV and coil panel with a wet rag to prevent overheating while brazing,Use a nitrogen flow and braze all connections while brazing. Use a shield plate to prevent the copper pollution.

7. Remove the TXV fixed screws.

8. Replace a new TXV, wrap the TXV with a wet rag or dip into water to prevent overheating while brazing.

9. Allow tubing to cool and pressurize line sets with 150 PSI of nitrogen to check braze connections and flow assembly for leaks. Make repairs as needed.

front view

BULB

screws

TXV

Figure 10

Data subject to change

removed insulation view

04.2023 | Bosch Thermotechnology Corp.

Installation Manual Bosch Multi-Position Cased Coils | 15

10. Dry the TXV.

11. It is recommended to insulate the TXV and liquid line.

12. Connect and secure the TXV to the coil panel, Wrap a wet rag to prevent overheating while brazing.Use a shield plate to prevent the copper pollution.

13. Clean a straight section of the vapor line in original position. Use the straps to secure the TXV sensing bulb on top of the vapor line as picture, about 45 degrees.

14. Insulate the entire vapor line and sensing bulb. It is also recommended to insulate the TXV and liquid line between the valve and coil to prevent condensation in hot humid environments.

15. Replace the front coil panel and secure in place. Follow the steps in the installation guide for vacuum requirements and system start up procedures.

16. Allow system to run for a minimum of 10 minutes in the cooling mode, charge the system to 10degrees of subcooling, Adjust the expansion valve to achieve

9 (± 3 degrees) of superheat.

17. Allow system to run for an additional 10 minutes to verify the subcooling and superheat readings.

Expansion Valve (TXV) Spare Parts

Cased Coil Model Number

BMAC2430ANTD

BMAC2430BNTD

BMAC3036ANTD

BMAC3036BNTD

BMAC3036CNTD

BMAC4248BNTF

BMAC4248CNTF

BMAC4248DNTF

BMAC4860CNTF

BMAC4860DNTF

Table 4

Spare Parts Material Number - Expansion Valve (TXV)

8733948235

8733948235

8733948235

8733948235

8733948235

8733941929

8733941929

8733941929

8733941932

8733941932

brazing shield plate

Figure 11

Bosch Thermotechnology Corp. | 04.2023

brazing shield plate

Data subject to change

United States and Canada

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 866-642-3198

Fax: 954-776-5529 www.boschheatingandcooling.com

BTC 770101101 D / 04.2023