GRUNDFOS IO 50 SQFlex Instructions
- June 8, 2024
- GRUNDFOS
Table of Contents
IO 50 SQFlex
Instructions
IO 50 SQFlex
Installation and operating instructions
Limited warranty
Products manufactured by GRUNDFOS PUMPS CORPORATION (Grundfos) are warranted
to the original user only to be free of defects in material and workmanship
for a period of 24 months from date of installation, but not more than 30
months from date of manufacture. Grundfos’ liability under this warranty shall
be limited to repairing or replacing at Grundfos’ option, without charge,
F.O.B. Grundfos’ factory or authorized service station, any product of
Grundfos’ manufacture. Grundfos will not be liable or any costs of removal,
installation, transportation, or any other charges which may arise in
connection with a warranty claim. Products which are sold but not manufactured
by Grundfos are subject to the warranty provided by the manufacturer of said
products and not by Grundfos’ warranty. Grundfos will not be liable for damage
or wear to products caused by abnormal operating conditions, accident, abuse,
misuse, unauthorized alteration or repair, or if the product was not installed
in accordance with Grundfos’ printed installation and operating instructions.
To obtain service under this warranty, the defective product must be returned
to the distributor or dealer of Grundfos’ products from which it was purchased
together with proof of purchase and installation date, failure date, and
supporting installation data. Unless otherwise provided, the distributor or
dealer will contact Grundfos or an authorized service station for
instructions. Any defective product to be returned to Grundfos or a service
station must be sent freight prepaid; documentation supporting the warranty
claim and/or a Return Material Authorization must be included if so
instructed.
GRUNDFOS WILL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES,
LOSSES, OR EXPENSES ARISING FROM INSTALLATION, USE, OR ANY OTHER CAUSES.
THERE ARE NO EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE, WHICH EXTEND BEYOND THOSE WARRANTIES
DESCRIBED OR REFERRED TO ABOVE.
Some jurisdictions do not allow the exclusion or limitation of incidental or
consequential damages and some jurisdictions do not allow limit actions on how
long implied warranties may last. Therefore, the above limitations or
exclusions may not apply to you. This warranty gives you specific legal rights
and you may also have other rights which vary from jurisdiction to
jurisdiction.
General information
Read this document before you install the product. Installation and operation must comply with local regulations and accepted codes of good practice.
2.1 Hazard statements
The symbols and hazard statements below may appear in Grundfos installation
and operating instructions, safety instructions and service instructions.
DANGER
Indicates a hazardous situation which, if not avoided, will result in death or
serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided, could result in death
or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided, could result in minor
or moderate personal injury.
The hazard statements are structured in the following way:
SIGNAL WORD
Description of the hazard Consequence of ignoring the warning
• Action to avoid the hazard.
2.2 Notes
The symbols and notes below may appear in Grundfos installation and operating
instructions, safety instructions and service instructions.
Observe these instructions for explosion-proof products.
A blue or grey circle with a white graphical symbol indicates that an action
must be taken.
A red or grey circle with a diagonal bar, possibly with a black graphical
symbol, indicates that an action must not be taken or must be stopped.
If these instructions are not observed, it may result in malfunction or damage
to the equipment.
Tips and advice that make the work easier.
Applications
The IO 50 SQFlex switch box is made for solar-powered SQFlex systems and is an
on/off switch for the system power supply.
In addition, the IO 50 functions as a connection point for all necessary
cables.
By means of the on/off switch, it is possible to
- start/stop the pump
- reset alarms.
All installations must comply with local or National Electrical Codes (NEC article 690, Solar Photovoltaic Systems).
Installation
Warning
Before starting any work on the IO 50, make sure that the power supply has
been disconnected and that it cannot be accidentally connected.
4.1 Mechanical installation
The IO 50 SQFlex must be placed on a firm and stable surface that fits the
box.
4.2 Electrical connection
The electrical connection must be carried out by an authorized electrician in
accordance with local regulations.
Two typical wirings are shown in section A.1. Appendix.
-
One DC conductor grounded. This option is intended for permanently mounted solar panels.
Note: For systems with an open-circuit voltage above 50 V, one conductor must be grounded, NEC 690. -
AC connection. This option is intended for portable AC generators or systems with an open-circuit voltage below 50 VDC.
Position of wire jumpers
| Wiring | Place the wire jumpers between |
|---|---|
| One DC conductor grounded | 1L1 – 3L2…………..5L3 – 7L4………….4T2 – 6T3 |
Explanation
The jumpers are necessary in order to meet the demands of the circuit breaker
due to the complexity of handling DC currents. This means that contact sets in
series connection are required.
Warning
Never make any connections in the IO 50 unless the power supply has been
disconnected.
The IO 50 must be connected in accordance with the rules and standards in
force for the application in question.
Use appropriate compression fittings to ensure watertight cable entries.
The IO 50 must be grounded.
The DC supply voltage is stated on the nameplate. Make sure that the IO 50 is
suitable for the power supply on which it will be used.
Technical data
System voltages
- DC: Maximum 300 V, PE.
- AC: Maximum 254 V, 50/60 Hz, PE.
All four relay contacts must be used to meet the rated DC voltage. See the
connection diagrams in section A.1. Appendix.
Maximum current………………………. 16 A
Ambient temperature…………………………. Tamb.: -30 °C to 50 °C.
Enclosure class…………………………………… NEMA 3R or IP55.
Disposing of the product
This product or parts of it must be disposed of in an environmentally sound way.
- Use the public or private waste collection service.
- If this is not possible, contact the nearest Grundfos company or service workshop.
See also end-of-life information at www.grundfos.com/product- recycling.
A.1. Appendix
| Pos. | Description |
|---|---|
| 1 | Solar Module |
| 2 | SQ Flex |
Connection diagram, AC connection
| Pos. | Description |
|---|---|
| 1 | Solar Module |
| 2 | SQ Flex |
Install the jumpers as indicated in section 4.2 Electrical connection.
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