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Installation Guide
ENGLISH
Safety Note
To avoid injury and damage to persons
and devices, it is absolutely necessary
these instructions are carefully read and
observed prior to assembly and commissioning.
Necessary assembly, start-up, and maintenance
work must be performed only by qualified,
trained and authorised personnel.
Prior to assembly and maintenance work on the
controller, the system must be:
- depressurized
- cooled down
- emptied
- cleaned
Please comply with the instructions of the
system manufacturer or system operator.
Disposal instruction
This product should be
dismantled and its components
sorted, if possible, in various
groups before recycling or
disposal.
Always follow the local disposal regulations.
Definition of Application
The controller is used for differential
pressure control of water and water glycol
mixtures for heating, district heating and
cooling systems.
The technical data on the rating plates
determine the use.
Scope of Delivery
Assembly kit PCV-VFG21:
main valve, throttling element, impulse
tube (throttle to main actuator)
To order additionally:
pilot valve, impulse tube set and thread tail
pieces for pilot valve.
Not included:
bypass pipes
Bypass pre-assembly ❶
Remove flat gaskets from tailpieces before
welding.
Welding: tailpiece to bypass pipe 2x, tail piece
to tailpiece 1x. Make a joint (A) first and then do
welding (B).
Return flat gaskets to tailpieces.
Bypass assembly ❷
Connect a throttling element to the pilot
valve ① using welded tailpieces: align
flow direction – throttle in front of the pilot
valve. Align valve actuator and throttle
impulse connection as on drawing.
Connect bypass pipes ②: align pipes and
valve as on drawing.
VI.JA.L1.02
Assembly kit PCV-VFG 21 DN 100-125
Holes for Bypass ❸
Mark connection points on a main pipe
and drill holes for bypass flow.
Connect bypass ❹
Make a join ①. Align main and bypass
media flow direction. Remove main valve
and weld bypass pipe to main pipe.
Return main valve ❺, check flow
orientation. Connect impulse tube from
throttling element to main valve pressure
actuator.
Impulse Tube mounting ❻
Put the steel ring into copper impulse tube ①,
press it completely in②. Immerse the end into
connection screw ③ and tighten with a key ④.
Connect pilot valve impulse tubes for
controllers ➐
Produced by Danfoss A/S © 10/2013
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