Installation On Combustible Floor; Boiler Water Piping - Viessmann Vitogas 050 ECD Series Installation & Service Manual

The boiler location must never be under negative pressure.
Exhaust fans, attic fans, or dryer fans may cause air to be
exhausted at a rate higher than air can enter the structure for
safe combustion.
Warning:
Never cover the boiler or store debris or other
materials near the boiler, or in any way block the flow
of adequate fresh air to the boiler. Never cover the
combustion air duct.
Excerpt from our warranty terms
Boiler is not covered under any warranty terms for damages
resulting from the following:
Improper application and installation, installation by unqualified
personnel, ignorance of instructions, improper service and
maintenance work, incorrect replacement component selection or
application, incorrect field wiring. Full warranty applies only when
boiler is installed and operated according to instructions and
used only with the proper gas and the applicable gas pressures.
Please read boiler warranty card.
Standard equipment
Wet base sectional cast iron heat exchanger with
stainless steel burners
Boiler completely assembled with vertical draft diverter
Electronic ignition
24 VAC redundant seat gas valve
Boiler fully insulated with 1
blanket
Boiler control panel with fixed high limit and temperature
gage
Pump aquastat to turn pump on
One 120/24 VAC transformer
30 psig pressure relief valve, pressure gage and fittings
One cleaning brush
Adjustable high limit

Installation on combustible floor

Placement of boiler
1. Verify that base size and material are in conformity with
local codes.
2. Locate the base so that the minimum clearances of boiler
to combustible materials are maintained as outlined on
page 3.
3. Base must be constructed of hollow concrete blocks,
minimum height 100 mm (4˝), covered with sheet metal at
least 24 ga. thick.
4. The base must extend beyond the boiler enclosure by at
least 150 mm (6˝) on all sides.
5. The blocks must be placed to provide an unbroken
concrete surface under the boiler, with the hollows running
continuously and horizontally to allow air circulation.

Boiler water piping

Install pressure relief valve and pressure gage directly to boiler
supply. No isolation valve must be installed between boiler
supply and pressure relief valve. Install pressure relief valve as
shown in Fig. 4.
Water piping must be supported by pipe hangers. Boiler must
not support weight of water piping.
8
1
⁄ ˝ fiberglass wrap-around
2
Combustible floor
Note: Minimum base extension 6˝ beyond all
sides of boiler enclosure
Fig. 3
Suggested base for installation on combustible floor
Pressure
relief valve
Supply
piping to
radiation
Fig. 4
Pressure relief valve installation
(Use fittings supplied in accessory pack)
Fig. 4a
Multi-zone system using zone pumps. Piping arrangement for
best air elimination (see note on following page)
Before boiler is connected to a piping/heating system which
has previously been in service (boiler is a replacement boiler),
the piping system should be flushed thoroughly with water in
order to remove sludge or other contaminants, especially in
large piping systems such as old gravity pipe systems.
Check system for pipe leaks, defective valves etc. and make
required corrections immediately.
6˝
6˝
4˝
Boiler
supply
connection
Pressure
gage
Air vent
Pressure
reducing
Air separator
valve
Precharged PRV
expansion
tank
C
F
Pressure
gage
ECD boiler
Backflow
preventer