Commissioning
14
—
English
Servimat M/L — 28.01.2021
Description
Calculation
p
st
Static pressure
= static head (h
st
)/10
p
0
Minimum operating pressure
= p
st
+ 0.2 bar
p
a
Supply pressure (pump "ON")
= p
0
+ 0.3 bar
Static pressure range (control ball
valve RKH1 "CLOSED" / Pump
"OFF")
= p
0
+ 0.5 bar
p
e
Final pressure (control ball valve
RKH1 “ON”)
≤ p
Sv
- 0.5 bar (for p
Sv
≤ 5.0 bar)
≤ p
Sv
x 0.9 (for p
Sv
> 5.0 bar)
p
Sv
Safety valve actuating pressure
= p
0
+ 1.2 bar (for p
Sv
≤ 5.0 bar)
= 1.1 x p
0
+ 0.8 bar
(for p
Sv
> 5.0 bar)
1
Suction pressure maintenance
•
Device on the suction side of the system's circulating pump
2
Final pressure maintenance
•
Device on the discharge side of the system's circulating pump
The "P
0
" minimum operating pressure is calculated as follows:
Calculation
Description
p
st
= h
st
/10
h
st
in metres
p
D
0.0 bar
for safety temperatures ≤ 100 °C
(212° F)
0.5 bar
for safety temperatures = 110°C
(230° F)
d
p
60 - 100 % of the differential
pressure of the circulating pump
Depending on the hydraulics
P
0
≥ p
st
+ p
D
+ 0.2 bar* (suction
pressure maintenance)
Enter the calculated value in the start
routine of the controller, see
chapter 9.3 "Modifying the controller's
start routine" on page 17 .
≥ p
st
+ p
D
+ d
p
+ 0.2 bar* (final
pressure maintenance)
*
Addition of 0.2 bar recommended, no addition in extreme cases
Calculation example for "P
0
" minimum operating pressure:
Heating system: Static height 18 m, run-on temperature 70 °C (158° F), safety
temperature 100 °C (212° F).
Example calculation for suction pressure maintenance:
P
0
= p
st
+ p
D
+ 0.2 bar*
p
st
= h
st
/10
p
st
=18 m/10
p
st
= 1.8 bar
p
D
= 0.0 bar at a safety temperature of 100 °C (212° F)
P
0
= 1.8 bar + 0 bar + 0.2 bar
P
0
= 2.0 bar
Note!
–
The initial and final pressure of the following components must
not overlap with the actuating pressure of the safety valve.
•
Control ball valve RKH1
•
Pumps
–
The actuating pressure must not fall below the minimum value of
the actuating pressure of the safety valve.
Note!
Avoid dropping below the minimum operating pressure. Vacuum,
vaporisation and the formation of vapour bubbles are thus excluded.
7.3
Filling the device with water and venting
CAUTION
Risk of burns
Escaping hot medium can cause burns.
•
Maintain a sufficient distance from the escaping medium.
•
Wear suitable personal protective equipment (safety gloves and goggles).
1 "PI" vacuum gauge
5
"PU" pump
2 "DV" degassing valve
WC
Make-up pipe
3 "FD" feed and drain cock
DC
Degassing lines
4 "AV" venting screw
EC
Expansion pipe
1.
Use the facility system to fill the device.
–
After you have opened the "DC" ball valve, the vacuum spray pipe
will autonomously fill if the facility system provides sufficient water.
2.
Optional
–
Use the feed and drain cock to fill water into the device (3).
–
Connect a hose at the feed and drain cock (3) of the "VT" vacuum
spray pipe.
3.
Fill the vacuum spray pipe with water.
–
Air escapes via the degassing valve (2) and the water pressure can be
read at the vacuum gauge (1).
