Vaillant ecoTEC plus 937 Instructions For Installation And Servicing

31ecoTEC plus 937 installation and maintenance manual
X 2
BUS
— +
24V
7 8 9
230V
L N 3
4 5
X 20
X40
X31
X12
X41
Electronics box
Hot water
outlet (NTC)
Fan
Ignition electrode
Flow temperature
sensor (NTC)
Diverter valve
Gas valve
Water pressure sensor
Return temperature
sensor (NTC)
X 20/5 red
X 20/7 black
X 20/7 black
X 20/8 blue
X 2/12 green
X 2/11 red
X 2/9 black
Pump
X 20/18 red (24 VDC)
X 20/9 blue (Erde)
X 20/16 blue (Earth)
X 20/13 black
X 20/12 black
X 20/4 grey (PWM)
X 20/3 black (Hall-Signal)
X 20/17 red (24 VDC)
X 2/15 brown C
X 2/8 blue D
X 2/16 black A
X 2/7 pink B
X 2/3 red (+ 5V)
X 2/2 black (Earth)
X 2/6 Green (Signal)
X 2/5 violet (Signal)
X 2/1 black
Plate
heat exchanger
(NTC)
X 2/4 orange
X 2/10 black
Thermal fuse
Plug
connection
Fig. 4.20 Wiring diagram combi boiler
Sequence of operations during installation 4

Vaillant ecoTEC plus 937 Specifications

General

Model	ecoTEC plus 937
Category	Boiler
Type	Combination
Output	37 kW
Dimensions	720x440x338 mm
Mounting	Wall-mounted
ERP Efficiency Rating	A
Fuel Type	Natural Gas
Flow Rate	15.2 l/min
Hot Water Flow Rate	15.2 l/min at 35°C temperature rise
Gas Type	Natural Gas
Warranty	5 years
Efficiency	94%
DHW Output	4.0 - 37.0 kW