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Repair
20 309909H
Replacing Solenoids
Follow this procedure to replace a single solenoid.
1. Remove User Interface cover. See page 16.
2. Disconnect two solenoid wires (V) from main board.
F
IG. 8.
3. Disconnect dispense valve pilot lines (A1, A2, B1,
B2). F
IG. 8.
4. Remove two screws (S).
5. Remove and replace solenoid (306b).
6. Reassemble. Solenoid wires are polarized (red +,
black –). Refer to Electrical Schematic, page 22.
Replacing Alternator Regulator
1. Remove User Interface cover. See page 16.
2. Remove two screws (309) from the back of the con-
trol box.
3. Disconnect supply and exhaust air lines (310). F
IG.
5, page 19.
4. Disconnect solenoid wires 12 position Phoenix con-
nector (306r) from main board.
5. Remove solenoid module (306) with regulator
(306e). F
IG. 8.
6. Unscrew and replace regulator (306e).
7. Reassemble. Refer to Electrical Schematic, page
22.
8. Set regulator to 24 psi (160 kPa, 1.6 bar).
Replacing Alarm
1. Remove User Interface cover. See page 16.
2. Disconnect alarm wires from main board.
3. Unscrew alarm (313) and replace. F
IG. 5, page 19.
4. Reassemble. Refer to Electrical Schematic, page
22.
From left to right, solenoid functions are as follows:
• Component A
• Component B
Make sure gaskets (306j, 306k) are in place when
reinstalling solenoid module.
F
IG. 8
TI4558a
V
310
S
Set regulator pressure to 24 psi (160 kPa, 16 bar).
Safety relief valve (306t) is required on all IS units.
1
2
1
306e
306b
306j
306k
TI4699a
Dispense Valve
Pilot Lines
A1 (off), clear tube
A2 (on), black tube
B1 (off), green tube
B2 (on), red tube
2
306t
A1
A2
B1
B2
A1
B1
A2
B2
AB