CALEFFI 518500 Differential By Pass Valve Instructions

CALEFFI 518500 Differential By-Pass Valve

Product Specifications

• Materials:
  • Body: Brass EN 12165 CW617N (518500, 518002), Brass EN 12165 CB7535 (518015)
  • Obturator: PA6G30
  • Obturator seals: EPDM
  • O-Ring seals : EPDM
  • Seals (union) 518500, 518015: Asbestos-free fiber
  • Knob: ABS
  • Spring: Stainless steel
• Connections:
  • 518500: 3 /4 F (ISO 228-1) x M with union
  • 518002: 3/4 F (ISO 228-1) x M with union
  • 518015: 3/4 F (ISO 228-1) x M with union
• Fluid: Water, glycol solutions up to 30%
• Maximum Operating Pressure: 10 bar
• Performance
  • Medium: water, glycol solutions
  • Max. percentage of glycol : 30 %
  • Maximum working pressure: 10 bar
  • Working temperature range: 0–100 °C
  • Setting value: – 518500, 518002, 518015: 10–60 kPa (1–6 m w.g.)

Product Usage Instructions

INSTRUCTIONS FOR INSTALLATION, COMMISSIONING AND MAINTENANCE
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DIFFERENTIAL BY-PASS VALVE

Warnings
The following instructions must be read and understood before installing and maintaining the product. The symbol means:

CAUTION! FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN A SAFETY HAZARD!

Safety
The safety instructions provided in the specific document supplied must be observed.

LEAVE THIS MANUAL AS A REFERENCE GUIDE FOR THE USER DISPOSE OF THE PRODUCT IN COMPLIANCE WITH CURRENT LEGISLATION

Function
The by-pass valve is used in systems where widely varying flow rates may operate. It ensures a flow recirculation proportional to the number of valves being closed, while limiting the maximum differential pressure value generated by the pump.Function The by-pass valve is used in systems where widely varying flow rates may operate. It ensures a flow recirculation proportional to the number of valves being closed, while limiting the maximum differential pressure value generated by the pump.

Installation:

1. Ensure the system is turned off and depressurized.
2. Select an appropriate location for the valve ensuring easy access for maintenance.
3. Connect the valve to the system following the provided connection guidelines.
4. Tighten all connections securely using appropriate tools.

Hydraulic characteristics

Installation

The differential by-pass valve can be fitted in any position, respecting

the flow direction indicated by the arrow on the valve body. In systems with a traditional boiler it is normally fitted between the system flow and return ends, which allows the pressure and passage of a minimum flow through the heat generator to be controlled. In the event of high by-pass flow rate levels, it is recommended to fit the valve between the flow and return ends of each column, rather than fitting a number of valves in parallel at the central heating system. The verification of the tightness and the lack of leakages after the installation of the device is responsibility of the installer. Setting

To regulate the valve, turn the knob to the value required on the graduated scale: the values correspond to the differential pressure at which the by-pass is opened. To carry out rapid by-pass valve adjustment it is possible to use the following practical method, which can be applied, for example, to the system in an apartment fitted with thermostatic valves: the system must be operating, the regulating valves must be fully open and the by-pass valve must be set to its maximum value (fig. E – G). Close approximately 30 % of the thermostatic valves. Gradually open the valve using the control knob (fig. F – H). Use a temperature gauge, or simply your hand, to check that the hot water is flowing into the by-pass circuit. As soon as a temperature rise is detected, open the thermostatic valves again and check that the hot water stops flowing into the by-pass.

Commissioning:

1. Gradually increase the flow through the system.
2. Observe the valve’s operation and adjust as needed to achieve desired flow rates.

Maintenance

1. Regularly inspect the valve for any leaks or signs of wear.
2. Clean the valve and surrounding area to prevent debris accumulation.
3. If any issues are detected, refer to the troubleshooting section of the manual or contact customer support.

H0012907.01

518500 3/4″ 10-60 kPa

518002 Ø22 10-60 kPa

518015 3/4″ 10-60 kPa

Frequently Asked Questions

Q: What is the maximum pressure this valve can handle?
A: The valve can handle a maximum operating pressure of 10 bar.

Q: What type of fluids can be used with this valve?
A: The valve is suitable for water and glycol solutions up to 30% concentration.

Q: How do I adjust the flow recirculation with this valve?
A: The flow recirculation is proportional to the number of valves closed. Adjust the valves in your system to control the flow recirculation.

References

• Caleffi Hydronic Solutions | Caleffi S.p.a.

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