Adding Prv And Label - Viessmann CombiPLUS Kit Installation & Quick Start Manual

CombiPLUS Kit for Vitodens 100-W, WB1B Quick Start

Adding PRV and Label

Boiler
Supply
Heating
Circuit
Supply
P
O
1
S
2
Boiler
Return
A
Heating
Circuit
DHW DCW Return
Installing the PRV P and tee O to the
CombiPLUS A and label S to the boiler.
Note: The system must be leak tested.
Refer to the boiler Installation
Instructions.
The DHW pressure relief valve is designed
to relieve excessive pressure in the system,
produced during domestic hot water heating.
Model: Watts No. 3L
Size: ¾" NPT
Max. Operating Pressure: 150 psig
Input Rating: 200 MBH
The installation of the DHW pressure relief
valve must be in accordance with local codes.
The DHW pressure relief valve must be installed
in the domestic hot water supply by a heating
contractor. If local codes require a different
relief valve, substitute the valve supplied by the
manufacturer. The heat exchanger is approved
for a max. operating pressure of 150 psig.
The DHW pressure relief valve must be
installed in vertical position in the domestic hot
water supply as close to the CombiPLUS heat
exchanger as possible. Drain pipe (of same
diameter as valve outlet) must be routed to safe
place of disposal, and must be installed with a
downward slope from the valve.
Do not install a shutoff valve between the DHW
pressure relief valve and the heat exchanger, or
in the drain pipe.
1
Install the 150 psi PRV P and tee O
to the installed field supplied piping from
the CombiPLUS A.
2
Apply the scald danger label S as
shown.
Note: This label must be installed as required
by national code.
Installation
13