Coolant Pump

Coolant pumps, used for main coolant or Water/Air intercoolers

Bosch

General use

0392020034

Used on some GMs, small in size, can be used for W/A IC.

0392020034

Ratings

10w

Flow ?

Fittings:

Inlet: 5/8"? (not sure if od or id) barb

Outlet: 5/8"? barb

Mounting ?

Interchange numbers

0392020034, 10438993

0392022002 (Cobra Pump)

Similar to the 200034, but larger. Used on Supercharged Fords, etc. Suitable for higher flow intercoolers.

Connector

2 pin Junior Power Timer

Ratings

50w

Flow ?

Fittings - Barb size ?

Mounting: ?

Interchange numbers

0392022002, 15076931, PEB500010

0392023004

Mercedes-Benz

Connector

2 pin 1J0973722(?)

Ratings

• 13W
• Operating Pressure (PSI) 1.45
• 4 GPM (15L/Minute)
• 3/4″Lip Creates a Secure Connection when used on 5/8″ Hose
• IP69K Protection Type
• Recommended Mounting Clamp 2.25″

Interchange numbers

0392023004, 1718350064, 1978350064, 2048350364, 2118350264, 6398350064, 16-00102

Pierburg

CWA Flow Rates

Common on VW/BWMs, various sizes to suit small intercoolers to full engine coolant. PWM controlled

https://tecomotive.com/store/en/water-pumps/?o=1&p=1

CWA200

Good-sized pump for most applications main coolant

•     Operation voltage: 8-16 volts
•     Weight: approx. 2.15 kg
•     Current consumption: 15A (16.5A max.) / (approx. 0.2mA in standby mode)
•     Nominal diff. pressure: 0.45 bar *
•     Flow rate: ca. 116 l/min @ 0.45bar / 166 l/min @ 0.30bar
•     Speed: approx. 4500 rpm
•     Temperature range: -40°C – 128°C (water) / -40°C – 140°C (ambient)
•     Protection: IP67

Part numbers

•     Pierburg: 7.02851.20.0 / 7.02851.20.8 / 7.00294.17.0
•     BMW: 11517586925 / 11517586924 / 11517563183 / 11517546994 / 11517545201 / 11517521584

PWM Input

The PWM input is a unidirectional signal input which can be used to control the pump speed.

Input frequency

The frequency of the PWM signal can be in the following range:

• Range: 50 to 1000 Hz

Note: To make sure that the pump awakes under PWM controlling, an uninterrupted high pulse of at least 3 ms is necessary at the PWM input. For example: this is automatically achieved at a PWM frequency of 150 Hz and a duty cycle of 50% or above.

Duty cycle

The percentage duty cycle (DC) is represented by the ratio of T_high to T_periode:

DC[%] = T_high / (T_low+T_high)

Fig 10.

Fig. 10: Definition of the duty cycleTypical square wave PWM signal showing V_Hi, V_Lo, T_high, T_low, and period.

Input level PWM

Signal description	Max	Min
VHi	UB + 3 V* max. 28 V (60 s)*	0.6 UB
VLo	0.4 UB	GND - 3 V*

U_B = Power supply ^* Absolute maximum ratings!

Schematic of PWM interface

Fig 11.

Fig. 11: Schematic of PWM-InterfaceCircuit diagram showing PWM input conditioning with resistors, capacitors, diode, and connection to microcontroller (µP).

Ratio between duty cycle and speed

The ratio between duty cycle and speed is shown in the following diagram. Fig 12.

Fig. 12: Duty cycle versus speedGraph showing pump speed (%) vs. PWM duty cycle (%), with distinct modes: flat at low DC (Mode 1/2), linear from ~14% to 85% (Mode 3), and flat at high DC (Mode 4).

PWM modes

Mode	Duty cycle (DC)	Speed	Description
1	0% – 6%	Max or 0	MAX if BSD = high; 0 if BSD = 0
2	8% – 12%	0	Stop and error reset
3	14% – 85%	Min – Max	Controlled operation. The characteristic is linear
4	85% – 100%	Max	Full speed

The tolerance of the pump's interpretation of the PWM signal can vary by +/- 1% of the duty cycle.