Replacing The Safety Pressure Switch (Hp1) Of The Water Chiller - Bosch EPS 708 Repair Instructions

6.11 Replacing the safety pressure switch
(HP1) of the water chiller
6.11.1 Disconnecting the safety pressure switch
electrically
1. Switch off the EPS 708 at the main switch.
2. Secure the main switch so that it cannot be swit-
ched back on.
3. Unplug the mains plug or disconnect from mains
electricity.
4. Check that there is no power.
5. Remove the front cover of the test oil area.
6. Remove the side cover of the test oil area.
Fig. 59: Water chiller electrical cabinet
7. Remove the 4 fastening screws of the cover
(see Fig. 59, item 1).
8. Remove cover and place it to the side.
i
For an overview of the electrical cabinet compo-
nents, see section 4.8.
9. In the electrical cabinet, remove all covers from all
cable ducts.
10. On terminal block X1 (see Fig. 18, item 6), loosen
terminal 4 and terminal 10, and remove the two wi-
res of the safety pressure switch connection cable.
11. Remove all cable ties.
12. Open the cable gland (see Fig. 15, item 5).
13. Pull the safety pressure switch connection cable out
of the electrical cabinet.
Robert Bosch GmbH
6.11.2
1
Fig. 60:
1 Safety pressure switch HP1
2 Pressure switch PV1 for the fan
!
Repair | EPS 708 | 37
Removing the safety pressure switch
Overview of pressure switch
WARNING – Danger of frostbite from refri-
gerant!
Refrigerant causes severe frostbite on the skin
¶
Wear safety goggles
¶
Wear protective gloves.
The safety pressure switch is screwed onto a con-
nection with an integrated Schrader valve. The
Schrader valve ensures that no refrigerant can
escape from the system when the pressure switch
has been removed. Nevertheless, a small amount
of refrigerant may escape when the safety pressu-
re valve is being installed or removed. Excessive
refrigerant loss results in reduced performance or a
malfunction of the water chiller.
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1 689 975 233 2018-05-08