Bosch EPS 708 Repair Instructions page 38

en 38 | EPS 708 | Repair
!
When loosening the union nut on the safety pressure
switch, it is necessary to hold the safety pressure
switch firmly with a second wrench (see Fig. 61).
Otherwise, there is a risk that the connection can be
broken off.
Fig. 61: Installing the pressure switch
¶
Loosen the union nut on the safety pressure switch
(see Fig. 60, item 1) and remove the safety pressure
switch.
6.11.3 Installing the safety 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.
!
When tightening the union nut on the safety pressu-
re switch, it is necessary to hold the safety pressure
switch firmly with a second wrench. Otherwise,
there is a risk that the connection can be broken off
(see Fig. 61).
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After the safety pressure switch has been installed,
the connection must be checked for leaks with a
leak detection spray. Have the leak detection spray
ready prior to installation.
1. Screw the safety pressure switch onto the connec-
tion.
2. Carefully tighten the union nut while holding the
connection securely with a second wrench.
3. Check the connection for leaks with the leak detec-
tion spray.
6.11.4 Connecting the safety pressure switch electri-
cally
1. Push the connection cable into the electrical cabinet
through the cable gland (see Fig. 15, item 5).
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For an overview of the electrical cabinet compo-
nents, see section 4.8.
2. Attach the wires of the connection cable to terminal
4 and terminal 10 on terminal block X1
(see Fig. 18, item 6).
3. Place the connection cable in the cable duct.
4. Attach the covers to the cable ducts.
5. Tighten the cable gland (see Fig. 15, item 5).
6. Place the cover on the electrical cabinet and secure
with 4 fastening screws.
7. Secure the connection cable with cable ties.
6.11.5 Concluding operations
1. Check the protective conductor in accordance with
DGUV A3.
2. Switch on EPS 708.
3. Run the functional test (see section 6.7.6). During
the function test, occasionally check the safety
pressure switch connection for leaks with the leak
detection spray.
4. After a successful function test, reattach all covers.
5. Attach the side cover of the test oil area.
6. Attach the front cover of the test oil area.
Robert Bosch GmbH