Webasto Thermo 90 Installation Instructions

Pos. Designation Comment
A1 Heater Thermo 90/Thermo 90 S
A2 Electronic control unit
B1 Flame detector
B2 Temperature sensor
B3 Temperature limiter
B4 Interior-temperature thermostat
E Pencil-type glow plug
F1 Fuse 20A flat fuse SAE J 1284
F2 Fuse 5A flat fuse SAE J 1284
F3 Fuse 20A flat fuse SAE J 1284
H1 Symbol for “Heating” on display operation indicator (in pos. P1 or P2)
H2 LED in pos. S4 operation indicator (max. 2W)
H3 LED illumination of symbols (in pos. P1 or P2)
H4 LED max. 20 mA flame indicator (option)
H5 Lamp min. 1.2 W Operation indicator of pumping device
H6 Red LED (in pos. P2) Illumination of ’instant heat’ button,
stand-by state indicator, operation indicator
K1 Relay (in pos. A2) main relay
K2 Relay (in pos. A2) for circulating pump
K3 Relay
K5 Relay for vehicle fan
K6 Relay only req. if battery switch connected to neg. pole
M1 Motor combustion air fan
M2 Motor circulating pump
M3 Motor vehicle fan
P Tester for fault diagnosis
P1 Digital timer 1529 for presetting operating times
Pos. Designation Comment
P2 Digital timer, standard (1531) for presetting operating times
R Resistor series resistor for H4
S1 Switch for circulating pump for separate switch-on
S2 Switch battery switch connected to positive pole
S3 Switch battery switch connected to negative pole
S4 Switch on / off
S5 Disconnect switch 1 or 2-pole Emergency Stop switch electr. or pneum.
S6 Switch at pumping device connected to positive or negative pole
S7 Switch, pumping device connected to positive voltage
S8 Pushbutton ’instant heat’ button, remote control
S9 Switch heating/external control of circulating pump
V106 Transistor in pos. A2
V107 Transistor in pos. A2
V108 Transistor in pos. A2
X1 Connector 12-pole part of pos. A1
X2 Connector 8-pole part of pos. P1
X3 Connector 12-pole part of pos. P2
X4 Connector 2-pole
X5 Connector 2-pole
X6 Connector 2-pole diagnostic system
X11 Connector 12-pole at pos. A2 (ST 1)
X12 Connector 12-pole at Pos. A2 (ST 2)
X13 Connector 2-pole at pos. A2 (ST 3)
Y1 Metering pump
Y2 Magnetic valve for pumping device
Thermo 90 / Thermo 90 S
11

Webasto Thermo 90 Specifications

General

Brand	Webasto
Model	Thermo 90
Category	Water Heater
Language	English