Bosch IDP Referenzhandbuch

Technical Service Bulletin:

Evaporator Coil Replacement

Models: IDP (5 Ton) Heat Pump Units

Data subject to change without notice | BTC 761702118 A | 06.2022 Bosch Thermotechnology Corp.

www.bosch-thermotechnology.us 65 Grove Street Watertown, MA 02472 | Tel: 1-866-642-3198

Please read this entire document prior to proceeding with any work.

WARNING:

This bulletin is intended to provide technical guidance to a

professional who is qualiﬁed to work on heat pump products,

components, and refrigerant. If you are not qualiﬁed to work

on such equipment, please obtain the services of qualiﬁed

HVAC professionals.

WARNING: PERSONAL INJURY

The coil replacement procedure must not be undertaken

without ﬁrst removing all existing refrigerant from the

product.

If you have any questions regarding the information provided in this document,

please contact our Heat Pump Technical Support Team by phone at 1-800-283-

3787, or via email at [email protected]

CAUTION: PERSONAL INJURY, PRODUCT DAMAGE

This procedure requires two people and the use of a Coil

Replacement Support Bar (part# 8733957022, available

from Bosch at no charge) in order to be carried out safely.

Please do NOT attempt this procedure alone or without

obtaining the support bar and having it ready to use.

Evaporator Coil Replacement Procedure

1. Ensure that the unit is powered oﬀ and isolated from the electrical supply.

2. Reclaim all refrigerant (refer to installation manual for correct procedure).

3. Remove the 24 screws than run around the middle of all four sides of the

unit (Fig.1).

Figure 1

4. Remove the side panels (Fig.2).

Figure 2

Data subject to change without notice | Printed in the USA | BTC 761702118 A | 06.2022 Bosch Thermotechnology Corp.

Technical Service Bulletin

2 | IDP (5 ton) Heat Pump Units– Evaporator Coil Replacement

5. Heat and separate the brazed joints of the coil’s inlet and outlet connections

(Fig.3).

Figure 3

6. Remove 5 screws (Fig.4).

Figure 4

7. Remove 3 screws (Fig.5).

Figure 5

The following step REQUIRES two people in order to be carried out

safely, and will provide the clearance needed to physically remove the

existing coil.

8. Insert the coil replacemnent support bar in the following order.

a. 1st person - Lift the top section of the unit.

b. 2nd person - Insert temporary “coil replacement support bar” (Fig.6)

that will hold up the top section of the unit.

c. 1st person - Carefully lower the top section down onto the support bar.

Figure 6

9. Carefully remove the existing evaporator coil (Fig.7).

Figure 7

10. Remove the metal bracket from the existing evaporator coil (Fig. 8), and

install it on the new evaporator coil in the same location and orientation.

Data subject to change without notice | Printed in the USA | BTC 761702118 A | 06.2022 Bosch Thermotechnology Corp.

Technical Service Bulletin IDP (5 ton) Heat Pump Units– Evaporator Coil Replacement | 3

Figure 8

11. Pass a cable tie through the copper U-ends as close to the metal bracket

as possible, and gently tighten to bring the four rows of the evaporator

together securely (Fig.9).

Figure 9

12. Install the new evaporator coil into the unit, and secure the 5 screws in the

order shown in Fig.10. Remove the temporary support rod.

Figure 10

13. Using the correct procedure with nitrogen, braze the coil’s inlet and outlet

connections (Fig.11).

Figure 11

14. Evacuate and recharge the unit (refer to the installation manual for correct

speciﬁcations and procedure), reinstall all panels and screws, turn

the power back on to the unit and conduct a test run to ensure correct

operation.

Figure 12

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