BMAC Series Multi Position Cased Coils

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
Table of Contents

1 Key to symbols and safety instructions

4

1.2 Safety

4

2 General

5

2.1 Codes & regulations

5

2.2 Inspection upon unit arrival

5

2.3 Clearances

5

2.4 Dimensional data

6

3 Installation Instructions

9

3.1 Parts

9

3.2 Pre-installation instructions

9

3.3 Installation and trap connection

9

4 Drain application

10

4.1 Condensate drain piping

10

4.2 Plastic drain pan installation

10

5 Refrigerant connections

12

5.1 Airflow performance [CFM vs pressure drop]:

12

6 TXV replacement information

14

Bosch Multi-Position Cased Coils | 3

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

1.2 Safety Please read safety precautions before installation

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 indicates 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.

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.

i

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.

i
Front of unit i
Figure 2 Clearance – top view (including air duct)

i

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.

2 0 ‘ ‘

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 ”

VAPOR LINE CONNECTION COPPER (SWEAT)
LIQUID LINE CONNECTION
AUXILIARY DRAIN CONNECTION 3/4” NPT FEMALE PIPE THREAD

2 1 ”

W 1 2 0 ‘ ‘

TOP AIR STOP

COIL ACCESS PANEL
H PRIMARY DRAIN CONNETION 3/4” NPT FEMALE PIPE THREAD
AUXILIARY DRAIN CONNECTION 3/4” NPT FEMALE PIPE THREAD
W
PRIMARY DRAIN CONNETION 3/4” NPT FEMALE PIPE THREAD

VAPOR LINE CONNECTION LIQUID LINE CONNECTION
AUXILIARY DRAIN CONNECTION 3/4” NPT 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 / ¾ / ¾ / ¾ / ¾ / 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 ”

VAPOR LINE CONNECTION COPPER (SWEAT)
LIQUID LINE CONNECTION
AUXILIARY DRAIN CONNECTION 3/4” NPT FEMALE PIPE THREAD

2 1 ”

W 1 2 0 ‘ ‘

TOP AIR STOP

COIL ACCESS PANEL
H PRIMARY DRAIN CONNETION 3/4” NPT FEMALE PIPE THREAD
AUXILIARY DRAIN CONNECTION 3/4” NPT FEMALE PIPE THREAD
W
PRIMARY DRAIN CONNETION 3/4” NPT FEMALE PIPE THREAD

VAPOR LINE CONNECTION LIQUID LINE CONNECTION
AUXILIARY DRAIN CONNECTION 3/4” NPT 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 / / /

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 ”

VAPOR LINE CONNECTION COPPER (SWEAT)
LIQUID LINE CONNECTION
AUXILIARY DRAIN CONNECTION 3/4” NPT FEMALE PIPE THREAD

2 1 ”

W 1 2 0 ‘ ‘

TOP AIR STOP

COIL ACCESS PANEL
H PRIMARY DRAIN CONNETION 3/4” NPT FEMALE PIPE THREAD
AUXILIARY DRAIN CONNECTION 3/4” NPT FEMALE PIPE THREAD
W
PRIMARY DRAIN CONNETION 3/4” NPT FEMALE PIPE THREAD

VAPOR LINE CONNECTION LIQUID LINE CONNECTION
AUXILIARY DRAIN CONNECTION 3/4” NPT 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 / /

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.

F u r n a c e F u r n a c e

Installation Manual

Bosch Multi-Position Cased Coils | 9

3 Installation Instructions
3.1 Parts
Contact your distributor for authorized replacement parts.
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.
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.

Furnace

Right Hand Discharge

Horizontal Drain

Left Hand Discharge

Furnace

Horizontal Drain

Figure 7

Horizontal Drain Conditions (All other drain connections should be plugged)

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

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.

Upflow Discharge

Primary Drain Alternate Drain

Downflow Discharge

Primary Drain

Alternate Drain

Upflow Drain Connection

Downflow Drain Connection

Vertical Drain Conditions (All other drain connections should be plugged)

Figure 6

Bosch Thermotechnology Corp. | 04.2023

Data subject to change

1 0 | Bosch Multi-Position Cased Coils
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

Installation Manual
04.2023 | Bosch Thermotechnology Corp.

Installation Manual
Figure 8

2″

2”

Bosch Multi-Position Cased Coils | 11
CONDENSATE DRAIN TRAP The condensate trap is not mandatory but is recommended for efficiency.
Unit
DO NOT OVERTIGHTEN DRAIN FITTING UNIT MUST BE SLIGHTLY INCLINED TOWARD DRAIN CONNECTION TO APPROVED DRAIN

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

Pressure Drop (Inches of Water)

0.05

0.1

0.15

0.2

0.25

307

485

618

729

823

327

527

682

810

925

360

585

748

893

1019

307

485

618

729

823

327

527

682

810

925

360

585

748

893

1019

456

638

810

953

1077

505

726

932

1098

1244

533

857

1105

1319

1509

439

699

906

1071

1224

466

764

978

1157

1313

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.

0.3 911 1024 1132 911 1024 1132 1191 1375 1675 1362 1466

0.35 991 1122 1238 991 1122 1238 1284 1494 1824 1487 1590

0.4 1063 1217 1348 1063 1217 1348 1390 1604 1956 1589 1695

Data subject to change

04.2023 | Bosch Thermotechnology Corp.

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.

Model / Coil
BMAC2430ANTD BMAC2430BNTD BMAC2430CNTD BMAC3036ANTD BMAC3036BNTD BMAC3036CNTD BMAC4248BNTF BMAC4248CNTF BMAC4248DNTF BMAC4860CNTF BMAC4860DNTF Table 3

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.

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.

3. Remove relevant ties and pipe insulation.

7. Remove the TXV fixed screws.

4. Unwrap and remove the TXV sensing bulb.

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

5. Remove the equalizer tube from vapor pipe. Wrap the TXV and coil panel with

overheating while brazing.

a wet rag to prevent overheating while brazing. Use a shield plate to prevent 9. Allow tubing to cool and pressurize line sets with 150 PSI of nitrogen to check

the copper pollution.

braze connections and flow assembly for leaks. Make repairs as needed.

front view

BULB
screws TXV

Figure 10

removed insulation view

Data subject to change

04.2023 | Bosch Thermotechnology Corp.

Installation Manual

Bosch Multi-Position Cased Coils | 15

10. Dry the TXV.

Expansion Valve (TXV) Spare Parts

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.

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

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

shield plate
Figure 11 Bosch Thermotechnology Corp. | 04.2023

brazing
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