Service Manual

Page 41
Table 11 – Electric Values
ID
Component
Description
Measuring Wire
Colors
Value Remarks
14 Water Flow Sensor
Red-Blue GND 5 V
DC
Control power
Yellow-Blue GND
≈ 2.5 to 2.9 V
DC
or
(pulse frequency ~Hz)
On: ≥ 0.45 gpm (1.7l/min)
Note: See Table 9 to check
correspondence between water flow and
frequency signal.
22
Water Valve Stepper
Motor Black – Red
5 V dc
When replaced by a new spare part,
calibration is needed using MF parameter
in PA (Actuator) menu of display.
8 Bypass Water Valve Red – Red 0 v to 24 V dc
When replaced by a new spare part,
calibration is needed using bP parameter
in PA (Actuator) menu of display.
13
Thermal Fuse
(actuation
temperature:
237ºF / 114ºC)
Multimeter for Resistance Measurement R (Ω)
White cable – White cable
Circuit Open – Not Ok
(infinity – no continuity)
Circuit Closed – Ok
(0 Ohm – continuity)
19
Heat Exchanger
temperature NTC
10 kΩ NTC
See corresponding values in Table 13.
21
Outlet water
temperature NTC
20
Inlet water
temperature NTC
18
Air Box
temperature NTC
220 kΩ NTC See corresponding values in Table 12.
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