Limitations To Operation; Built-In Protection; Checking Of Operation; Service - Grundfos BMQ Montage- Und Betriebsanleitung

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8.1 Limitations to operation

The performance of the modules should always be
kept within the recommended flow and pressure
ranges of each individual module:
Recommended flows at 25°C (~ 77°F)
Type [m³/h]
BMQ 1 / BMQE-NE 1 0.5-1.6
BMQ 2 / BMQE-NE 2 0.8-3.0
BMQ 3 / BMQE-NE 3 1.0-4.0
BMQ 5 / BMQE-NE 5 2.0-7.0
BMQ 7 / BMQE-NE 7 2.0-9.0
Note: The pump dry-running protection is effective
only within the recommended duty range of the
pump.
Recommended pressures
Inlet pressure
Min.** Max.*
[bar] [p.s.i] [bar] [p.s.i] [bar] [p.s.i]
0.5- 7.5-
3" 15 217
2.0 29.0
* Note: If the maximum inlet/outlet pressure is
exceeded, install a safety valve.
** Note: See the curves on page 27 for correct inlet
pressure.
Maximum permissible liquid temperature
Maximum Minimum
liquid flow velocity
tempera- past
Motor
ture the motor
[°C / °F] [m/s]
≥ 0.15
40 / 104
3"
≥ 0.08
25 / 77

8.2 Built-in protection

The motor incorporates an electronic unit which pro-
tects the motor in various situations.
• In case of overload, the built-in overload protec-
tion will stop the booster module for 5 minutes.
After that period, the booster module will attempt
to restart.
• If started without water (dry running), the booster
module will stop after 30 seconds.
• If stopped as a result of dry running, the booster
module will start automatically after 5 minutes.
To reset the booster module, switch off the electricity
supply for 1 minute.
8
The motor is protected in case of:
• dry running,
• voltage surges (up to 5000 V),
• overvoltage,
• undervoltage,
• overload and
US GPM
• overtemperature.
2.2-7.04

9. Checking of operation

3.5-13.2
Depending on the number of operating hours of the
4.4-17.6
booster modules, the following should be checked at
8.8-30.8
suitable intervals:
8.8-39.0
• Flow.
• Starting frequency.
• Control and protective devices.
• Liquid temperature.
• Minimum flow through the modules during opera-
tion.
Outlet If any of the above checks reveal any abnormal
pressure operating details, inspection should be carried out in
accordance with the fault finding chart in section 11.
Max.*

10. Service

For the replacement and repair of parts of the
34 492
booster unit, please refer to:
1. Service manual for SQ/SQE describing replace-
ment of motor cable and motor.
2. Parts list for SQ/SQE with instructions for dis-
mantling and assembly of pump and motor.
3. If an SQ standard pump is used in connection
with service of the booster unit, the non-return
valve must be removed before the pump is fitted
in the sleeve, see section 10.1 Removal of non-
return valve.
Minimum
Note: The SQE-NE is supplied without non-re-
flow
turn valve.

10.1 Removal of non-return valve

[m³/h /
If a pump without non-return valve is required, the
US GPM]
valve can be removed as follows:
≥ 0.8 / 3.5
1. Cut off the legs of the valve guide using side-cut-
≥ 0.5 / 2.2
ting pliers or a similar tool, see fig. 7.
2. Turn the pump upside down.
3. Check that all loose parts fall out of the pump.
Fig. 7