Operating instructions

29
5603 882 - 01
Pyrotec Installation & Operating
Mechanical
Customer supplied:
- PDP Pressure relief valve drain pipe
- DCW Cold water inlet, min. 36 psi (2.5 bar), max.
51 psi (3.5 bar)
- AV Air separator / vent
- EXP Expansion tank closed;
- for safety heat exchanger required (size according
to volume of safety heat exchanger loops and volume
of piping
- for heating system (optional)
- WSL Water supply line for safety heat exchanger
- WLV Water supply line for thermal run-off safety valve
- SDP Safety heat exchanger drain pipe
- SRL System return line to the boiler from the system
- SSL System supply line from the boiler to the system
- BPL Bypass line
- BR Boiler return
- BS Boiler supply
Note: The KPT 1250, 30 psi will have 2 PRVs.
Piping and Installation of Safety Devices (continued)
Thermal safety flush valve
Boiler Model KPT- Thermal safety
flush valve
TS-2430
(Quantity)
Water through-
put required at
36 psi
(2.5 bar)
L/h GPM
Supply line
WSL
Supply line
WLV
Drain pipe
SDP
2
390 1 1637 7.2
R c in. R c in.
R 1 in.
530 1 2224 9.8
R c in. R c in.
R 1 in.
720 2 3020 13.3 R 1 in.
R c in.
R 1 in.
950 2 3986 17.6 R 1 in.
R c in.
R 1 in.
1250 2 5246 23.0
R 1a in. R c in.
R 1 in.
1
Threaded connection for supply line
2
Length of the drain pipe up to 13 ft. (4.0 m)
Pressure relief valve
Boiler model KPT- Pressure relief valve Conbraco
1
Drain pipe PDP
2
30 psi 60 psi 30 psi 60 psi
390
1a in.
1 in.
1b in. 1a in.
530
1b in. 1a in.
2 in.
1b in.
720 2 in.
1a in. 2b in. 1b in.
950 2 in.
1b in. 2b in.
2 in.
1250 2 in. 2 in.
2b in.
2 in.
Note: To reliably prevent boiler corrosion caused by
condensation of flue gases, the boiler return flow
temperature must not under any circumstances be
below 150° F (65° C).
A Viessmann sized boiler pump with a boiler mixing
valve are provided according to the tables below.
The boiler circuit should be designed such that the
temperature difference between the supply and the
return temperature is equal to or less than ∆t 27° F
(15° C).
The expansion tank has to be connected to the
boiler without any shut-offs.
Safety equipment supplied by Viessmann:
- M 20 Boiler pump
- Y 20 Boiler mixing valve
- PRV Pressure relief valve, pressure set to 30 or 60 psi
- TS2430 Thermal safety flush valve R ¾ in., approved
component; special-purpose, designed for opening at
a temperature of 122°- 248° F (50°- 120° C), (safety
heat exchanger loop built into boiler). The Pyrotec 390
and Pyrotec 530 have two safety heat exchanger loops
and require one thermal run-off safety valve.
The Pyrotec 720 to Pyrotec 1250 have four safety heat
exchanger loops and require two thermal run-off safety
valves.
- LWCO Low water cut-off
- PG Pressure gauge
- TG Temperature gauge (thermometer)
- SHE Safety heat exchanger, water volume 1.1 USG
(4.2L) per loop, NPTM b in.
Design Recommendation: