Return Temperature Elevation - Viessmann VD2-320 Installation Instructions Manual

Vitorond 200, VD2 Series 320 to 1080 Installation
Water Side Connections
Metric flange c/w
weld-on 2½ in.
NPT coupling
System
return header
(ANSI), 4 in.
System
supply
System return
header (ANSI)
(continued)

Return temperature elevation

A suitable low temperature protection package from
Viessmann is necessary for Vitorond 200, VD2 boilers.
Selection of the appropriate package typically takes place
System
supply header
prior to boiler delivery.
(ANSI), 4 in.
Please specify correct package at time of order.
Install the 30% boiler flow package as illustrated.
Metric flange
c/w weld-on
2½ in. NPT
The 30% boiler flow package consists of:
coupling
H 1 boiler pump
H 2 ball valves
H 1 flow check valve
Boiler supply
connection
Legend
(metric)
A Low water cut-off (standard equipment)
Metric flange
B Shunt pump
c/w weld-on
C Flow check valve
2½" NPT
D Location of Honeywell aquastat
coupling
E Location of aJ sensor
Boiler return
All piping field supplied.
connection
(metric)
Install 100% boiler flow package as illustrated.
The 100% boiler flow package consists of:
System supply
H 1 3-way mixing valve
header (ANSI)
H 1 actuator
H 1 boiler pump
Legend
F Boiler pump
G 3-Way mixing valve
Boiler supply
connection
H Low water cut-off (standard equipment)
(metric)
K Location of aJ sensor
All piping field supplied.
Boiler return
connection
(metric)
(to control boiler pump)
(installed in stainless steel well)
(installed in stainless steel well)
Connections
21