Installation manual

www.webasto.us 37 Webasto Product N.A., Inc.
Thermo 90 S / Thermo 90 ST Technical Data
Table 2: Technical Data - US Standard Measurement
Figure 36: Thermo 90 S (from 3/97) control module,
installation position
Figure 37: Thermo 90 ST control module, arbitrary
installation position
Heater Operation Thermo 90 S Gasoline Thermo 90 S Diesel Thermo 90 ST Diesel
EC licensing symbol e1*2001/56*0005*__ e1*2001/56*0005*__ e1*2001/56*0019*__
Model Water heater with Ferro-tec technology
Heat output Max.
regulating range 3830 BTU/hr – 26000 BTU/hr
31000 BTU/hr
6100 BTU/hr – 26000 BTU/hr
Fuel Gasoline Diesel
Fuel consumption Max.
regulating range 0.066 Gal/hr – 0.264 Gal/hr
0.29 Gal/hr
0.05 Gal/hr – 0.0237 Gal/hr
Rated voltage 12 V 12 or 24 V
Operating voltage range 10 ... 15 V 10 ... 15 or 20 ... 30 V
Nominal power consumption with circulation
pump (without vehicle fan)
Max.
regulating range 37 W - 83 W
90 W
37 W - 83 W
Max. ambient temperature:
Heater: - Operation -40° ... +230 °F (194 °F with control module installed on the heater)
- Storage -40° ... +230 °F (194 °F with control module installed on the heater)
Control module: - Operation -40° ... +167 °F -40° ... +167 °F -40° ... +185 °F
- Storage -40° ... +185 °F
Metering pump: - Operation -40° ... +68 °F -40° ... +104 °F
- Storage -40° ... +185 °F
Max. operating pressure (heat medium) Max. 29.0 PSI
Capacity of the heat exchanger 0.158 quart
Max. combustion air intake temperature +104 °F
Minimum capacity of the system 6.34 quarts
Coolant pump delivery rate against 2.17 PSI 435.8 Gal/hr
CO
2
in the exhaust gases
(normal function range)
Max. 10 ... 12.0% by volume
CO
2
- adjustment values at approx. + 68 °F
and geographic altitude above sea level
Max. 0 ft 1640.5 ft 3280.8 ft
10% 10.6% 11.3%
Heater dimensions (tolerance  0.118 in.)
* Control module installed on the heater
L 12.2 (13.97*) inch
W 5.157 inch
H 9.13 inch
L 12.2 (13.97*) inch
W 5.157 inch
H 9.13 inch
L 12.08 (13.85*) inch
W 5.157 inch
H 9.13 inch
Weight 10.58 lb.
0°-90°
0°-45°
0°-45°
0°-15°
125mm
144mm
49
24 V
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