Danfoss EVR 2 - User Manual

Coil and O-ring
A
B
Installation Guide
Solenoid Valve
Types EVR 2 – 22 Normally Closed/Normally Open (NC/NO)
© Danfoss A/S (RC-MDP/RJA), 2014-06 DKRCC.PI.BB0.T1.02 / 520H8766 1
032R9545 032R9545
Refrigerants:
R22/R407C, R404A/R507, R410A, R134a, R407A, R23.
For other refrigerants, please contactDanfoss.
EVR (NC are) EVR (NC solder) EVR (NC ange) EVR (NO solder)
Note:
tube construction
max. 100 °C (212 °F)
On
O
On
O
max. 700 °C (1300 °F)
EVR 2 – 8 EVR 10 PB EVR 15 – 22 PB
Max. working
pressure PS/MWP
45.2 bar
(656 psig)
35 bar
(508 psig)
32 bar
(464 psig)
Max. operating
di. pressure
(MOPD)
UL products – see sticker
Non UL – see armature tube
Media temperature
Min. medium temperature t
min.
= -40 °C (-40 °F)
Max. medium temperature t
max.
= 105 °C (221 °F)
Max. coil temperature
9 W a.c. (EVR 2) t
max.
= 40 °C (105 °F)
10/12 W a.c. t
max.
= 80 °C (175 °F)
20 W d.c. t
max.
= 50 °C (120 °F)
10 W a.c. t
max.
= 55 °C (130 °F)
Warning
Never switch on power
to the coil when the coil
is dismounted from the
valve. Otherwise the coil
may be damaged
and there is risk of injuries
and burns.
A: Be sure that the O-ring
is inplace
B: Sticker applies only
to UL products
Mounting directions
Flare mounting
Electrical connections
Mounting / dismounting coil
Soldering

Summary

Solenoid Valve Installation

Product Overview and Refrigerants

Details on Solenoid Valve types EVR 2-22 NC/NO and compatible refrigerants.

Mounting and Soldering

Instructions for valve mounting directions, soldering, and flare mounting.

Coil and Electrical Connections

Guidance on coil installation, O-ring placement, and electrical connections.

Top Part and Valve Seat Assembly

Procedures for mounting and dismounting the valve's top part and seat.

Overview

1. Installation and Mounting
2. Coil and O-ring Assembly
3. Electrical Connections
4. Soldering and Flare Mounting
5. Mounting/Dismounting Coil
6. Mounting/Dismounting of Top Part
7. Placement of Valve Seat
8. Valve Configurations and Disassembly

This document describes the installation and maintenance of Danfoss Solenoid Valves, specifically types EVR 2 – 22, available in Normally Closed (NC) and Normally Open (NO) configurations. These valves are designed for use with a range of refrigerants, including R22/R407C, R404A/R507, R410A, R134a, R407A, and R23. For applications involving other refrigerants, users are advised to contact Danfoss directly.

The solenoids are depicted in various configurations: EVR (NC flare), EVR (NC solder), EVR (NC flange), and EVR (NO solder). These different connection types offer flexibility for integration into various refrigeration systems.

Installation and Mounting:

The manual provides clear instructions for mounting the solenoid valves. For EVR (NC flare), EVR (NC solder), and EVR (NC flange) types, the mounting directions are illustrated, indicating a 90-degree rotation. The EVR (NO solder) type also shows its specific mounting orientation.

Coil and O-ring Assembly:

A critical aspect of installation is the correct assembly of the coil and O-ring. The diagram highlights the importance of ensuring the O-ring is properly seated. For UL-certified products, a sticker indicates compliance. A crucial safety warning is provided: never switch on power to the coil when it is dismounted from the valve. Doing so can damage the coil and poses a risk of injury and burns to the user.

Electrical Connections:

The electrical connections are illustrated, showing the wiring setup for the solenoid valve. The maximum coil temperatures are specified for different coil wattages (9 W a.c. for EVR 2, 10/12 W a.c., 20 W d.c., and 10 W a.c.), ranging from 40 °C (105 °F) to 80 °C (175 °F). The media temperature range is also provided, from a minimum of -40 °C (-40 °F) to a maximum of 105 °C (221 °F).

Soldering and Flare Mounting:

For solder connections, the maximum soldering temperature is 700 °C (1300 °F), with the maximum temperature at the valve body limited to 100 °C (212 °F). This ensures that the valve's internal components are not damaged during the soldering process. Flare mounting is also depicted, illustrating the proper technique for securing the valve.

Mounting/Dismounting Coil:

Instructions for mounting and dismounting the coil are provided, showing the "On" and "Off" positions, which likely correspond to the energized and de-energized states or the physical attachment/removal of the coil.

Mounting/Dismounting of Top Part:

Detailed steps are given for mounting and dismounting the top part of the valve. This involves specific torque values for different EVR types, ensuring proper sealing and operation. For EVR 2 and EVR 3, the torque is 1.4 Nm (0.15 kpm, 1 ft-lbs) with a T15 Torx size. For EVR 4, EVR 6, and EVR 8, the torque is 2.0 Nm (0.2 kpm, 1.44 ft-lbs) with a T15/T20 Torx size. Larger valves like EVR 10, EVR 15, and EVR 18 require 2.8 Nm (0.3 kpm, 2 ft-lbs) with a T25 Torx, while EVR 20 and EVR 22 require 12 Nm (1.2 kpm, 9 ft-lbs) with a T40 Torx.

Placement of Valve Seat:

The manual illustrates the correct placement of the valve seat, a crucial component for proper valve function. For EVR 4-8, specific instructions are given for dismounting the gasket and supporting ring: "Press and twist."

Valve Configurations and Disassembly:

The document provides exploded views and assembly diagrams for various valve configurations:

• EVR 2-3 (NC): Shows the components and assembly sequence for normally closed valves of smaller sizes.
• EVR 4-8 (NC): Similar to the above, but for medium-sized normally closed valves. For UL products, a sticker indicates specific compliance.
• EVR 10-22 (NC): Illustrates the larger normally closed valves, again with a note about UL product stickers.
• EVR 2-8 (NC): Another view of the normally closed valves, emphasizing certain components.
• EVR 10-22 (NC): A detailed view of the larger normally closed valves.
• EVR 4-8 (NO): Shows the components and assembly for normally open valves of medium size.
• EVR 10-20 (NO): Illustrates the larger normally open valves.

For many of these configurations, a "Sticker applies only to UL products" note is present, indicating specific requirements or certifications for valves intended for the UL market. These detailed diagrams are essential for proper assembly, disassembly, and maintenance, ensuring that all components are correctly installed and torqued to prevent leaks and ensure optimal performance. The emphasis on specific torque values and O-ring placement underscores the precision required for reliable operation of these solenoid valves in refrigeration systems.

Danfoss EVR 2 Specifications