22 DKDHR
VI.GP.P2.02
Danfoss District Energy
Instructions for installation and use
VX Solo II substations
10.0 Adjustment and commissioning, filling the system and differential pressure controller
General information
PLEASE NOTE! Some models may have a slightly different appearance,
but the control function is in principle the same as described below.
Commissioning
Commission the unit in accordance with the instructions on pages
17-21.
Filling the system
Filling of water to the heating system must be done through con-
nection to an exterior cold water supply.
Check and tighten all connections before adding water to the system,
as vibrations during transport may have caused leaks. After having
added water to the system, tighten all the connections before per-
forming leak test.
Then heat up the system, check the connections and tighten once
again if necessary.
Before adding water to the system and first start-up, check if:
- pipes are connected according to the circuit diagram,
- expansion vessel is connected,
- heat meter is mounted,
- shut-off valves are closed,
- threaded and flanged connections are tightened.
Filling - (Note, by means of exterior cold water supply):
If the pressure drops below 1 bar, water must be added to the system.
The operating pressure should never exceed 1.5 bar.
(The safety valve opens at 3 bar)
1. Pump must be switched off when water is added to the system.
2. Fill heat exchanger and system with water until the manometer
shows a working pressure, which corresponds to the system
5 m (approx. 1.5 - 2.0 bar)
3. Vent the system completely.
4. Start the pump.
5. For substations, which include zone valve, remember to remove
the red split on the position indicator of the zone valve.
If system pressure drops dramatically within a short time, heating
system should be examined for leakage, - this includes checking
the factory set pressure of the expansion vessel.
Differential pressure controller
(Standard on systems with self-acting thermostatic valve).
The differential pressure controller reduces the fluctuating pressure
in the district heating network to a small and invariable operating
pressure in the substation.
The required room temperature is controlled on your radiator ther-
mostats.
Differential pressure controller AVPL
AVPL is a self-acting differential pressure controller for PN 16 with
adjustable differential pressure setting and the differential pressure
controller can be set at any differential pressure between 5 kPa and
25 kPa (0.05 bar and 0.25 bar).
The preset factory setting of the controller is 10 kPa (0.1 bar).
The differential pressure can be set by means of an Allen key NV 3. 1
turn corresponds with 1 kPa (0.01 bar).
The controller settings can be changed in accordance with the en-
closed producer instructions:
Differential pressure controller (PN 16) AVPL
Return mounting, adjustable setting
7369316-0 SIBC
VI.CB.T1.6K © Danfoss 05/03
1
Instructions
AVPL 1.0/1.6
1
5
3
4
7
r
kPa
20
25
19
24
18
23
17
22
16
21
15
20
14
19
13
18
12
17
11
16
10
15
9
14
8
13
7
12
6
11
5
10
4
9
3
8
2
7
1
6
0
5
2
6
AVPL
