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NOTE:
obtained:
On the Thermo 90 the function of the combustion air fan
can be checked with the diagnostic computer or the
Resistance at 25 °C (77 °F): 990 & 1010 &!
components tester.
Test current:
On the Thermo 90 S, the check is performed by means
of the PC heater diagnosis.
6.3.2 Glow Pin Resistance Test
During electrical testing of the glow pin using a digital
multi-meter, the following readings should be obtained:
Glow pin: 12 Volt (red) 24 Volt (green)
Resistance at 25 °C: 0.324 & 0.360 1.3 & 1.44 &!
(77 °F):
Test current:
6-1
THERMO 90 / 90 S 7 CIRCUIT DIAGRAMS
The circuit diagrams (Figs. 7-3 and 7-5) show possible
7. Circuit Diagrams
circuits of the Thermo 90 S heater with:
7.1 General
" with standard switch and harness wiring using
Deutsch connector and blower interlock wiring with
The circuit diagrams (Fig. 7-2 and 7-4) show possible
Deutsch connector North American enclosure &
circuits of the Thermo 90 heater with:
compact kits (see Fig. 7-3).
" with 7-Day 3-Program digital timer wiring without
" with standard switch and harness wiring using
Deutsch connector German version (see Fig. 7-5).
Deutsch connector and blower interlock wiring with
Deutsch connector North American enclosure &
Fig. 7-1 shows the pin assignment (X1) for Thermo 90
compact kits (see Fig. 7-2).
and Thermo 90 S heaters.
" with 7-Day 3-Program digital timer wiring without
Deutsch connector German version (see Fig. 7-4).
CAUTION
The poles must not be looped or reversed as some
components are controlled by negative polarity.
1 = Glow Pin +
2 = Temperature Limiter +
3 = Flame Sensor +
4 = Temperature Sensor +
5 = Circulation Pump +
6 = Combustion Air Fan +
7 = Combustion Air Fan
8 = Circulation Pump
9 = Temperature Sensor
10 = Flame Sensor
11 = Temperature Limiter
12 = Glow Pin
View from rear
Fig. 7-1 Visual Inspection, Burner Rear Wall
7-1
7 CIRCUIT DIAGRAMS THERMO 90 / 90 S
Fig. 7-2 Circuit Diagram Thermo 90, 12 and 24 V Enclosure and Compact Kit with Deutsch Connector
7-2
THERMO 90 / 90 S 7 CIRCUIT DIAGRAMS
Fig. 7-3 Circuit Diagram Thermo 90 S, 12 and 24 V Enclosure and Compact Kit with Deutsch Connector
7-3
7 CIRCUIT DIAGRAMS THERMO 90 / 90 S
Thermo 90 Basic Kit Wiring (German)
Fig. 7-4 Circuit Diagram Thermo 90, 12 and 24 V German Version with 7-Day 3-Program digital timer
7-4
THERMO 90 / 90 S 7 CIRCUIT DIAGRAMS
Thermo 90 S Basic Kit Wiring (German)
Fig. 7-4 Circuit Diagram Thermo 90 S, 12 and 24 V German Version with 7-Day 3-Program digital timer
7-5
THERMO 90 / 90 S 8 SERVICING
8.5 Annual Maintenance
8. Servicing
Before or after each heating season the following
8.1 General
maintenance procedures should be performed to
maintain the heater's functional reliability:
This section describes the servicing procedures that may
be performed with the heater installed.
Heater and Enclosure
" Clean heater exterior and interior of enclosure of any
8.2 Work on the Heater
accumulated debris and dust with compressed air or
water. Do not force water into electrical connections
Prior to performing any work, it is mandatory to
or into heater.
disconnect the vehicle battery main lead. As long as the
heater is in operation or in run-down, the battery main
Electrical System
supply must not be disconnected due to the danger of
overheating and resulting in a response of the overheat " Examine electrical connections for corrosion at
protection. When performing extensive repairs on the connections and for security.
heater, a complete removal is advisable. After work on
" Examine battery condition and clean terminals.
the heating circuit, a coolant mixture consisting of water
" Load test batteries and replace as necessary.
and anti-freeze must be replenished in accordance with
manufacturer instructions followed by a careful bleeding
Combustion Air and Exhaust System
of the heating circuit.
" Check exhaust and combustion air tubes for damage
When performing repairs requiring a relocation of the
and for foreign matter and contamination. Repair or
installation position, the relevant installation instructions
replace damaged items as necessary.
and the vehicle-specific installation proposal have to be
observed.
Fuel System
8.3 Work on the Vehicle
" Replace fuel filter P.N. 487171 if equipped.
" Examine fuel lines and fuel filter for leakage and
damage. Repair or replace damaged items as
CAUTION
necessary.
In the vicinity of the heater, a temperature of 130 °C
(266 °F) must not be exceeded under any circumstances
Coolant System
(e.g. during body paint work).
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