18
Installing the System Piping
When installing the pressure relief valve follow these guidelines
,
:
●
Ensure that the valve s discharge capacity is equal to or greater
’
than the maximum pressure rating of the boiler s space heating
’
system
.
●
Ensure that the maximum BTU H rating on the pressure relief
/
valve is equal to or greater than the maximum input BTU H
/
rating of the boiler
.
●
Direct the discharge piping of the pressure relief valve so
that hot water does not splash on operator or any nearby
,
equipment
.
●
Attach the discharge line to the pressure relief valve and run the
end of the line to within 6 12 in 150 300 mm of the floor
-
(
-
)
.
●
Ensure that the discharge line allows for free and complete
drainage without restriction Do not install a reducing coupling
.
or other restrictions on the discharge line
.
If the relief valve discharges periodically this may be due to
,
thermal expansion caused by expansion tank waterlogging or
undersizing Do not plug the relief valve
.
.
3 2 Installing a Domestic Hot Water DHW
.
(
)
System
The VESTA VC boiler provides domestic hot water continuously
when flow is sensed by the flow sensor This method is the most
.
efficient means of heating water by allowing the boiler to operate at
a lower return water temperature by minimizing standby losses thus
,
increasing combustion efficiency
.
3 2 1 Guidelines for a DHW System
. .
With its multi purpose design the VESTA VC boiler provides hot
-
,
water on demand This means that the boiler produces DHW only
.
when the user demands it
.
The boiler recognizes a DHW demand when the flow sensor
detects a DHW flow of approximately 0 7 GPM or greater Once
.
.
the flow sensor detects the flow the boiler immediately goes into
,
DHW mode regardless of the status of the space heating system
.
Read and follow the guidelines listed below to ensure safe and
proper installation of a boiler heating system
.
Scald Hazard
Hotter water increases the risk of scald injury There is a hot water
.
scald potential if the DHW temperature is set too high Be sure
.
to follow the adjustment instructions in the boiler s operation
’
manual
.
Pressure Relief Valve for DHW
To complete the installation of the DHW system you must install
,
an approved
3
/
4
,
in maximum 150 psi pressure relief valve on
the hot water outlet The VESTA VC boiler has a built in high
.
-
temperature shut off switch so install a pressure only relief valve
,
“
“
.
WARNING
●
Installing the pressure relief valve improperly may result
in property damage personal injury or death Follow all
,
,
.
instructions and guidelines when installing the pressure
relief valve The valve should be installed only by a licensed
.
professional
.
●
The pressure relief valve must be installed at the boiler outlet
and in the vertical position as shown in the example below
,
,
with the drain pipe outlet exiting the side of the pressure
relief valve horizontally and elbowing down
.
The DHW pressure relief valve is not supplied but is required
,
.
The following examples are pressure relief valves approved for use
with the boiler
:
●
Wilkins P 1000A Zurn Industries
-
(
)
●
Conbraco 17 402 04
-
-
●
Watts Industries 3L M7
(
)
●
Cash Acme FWL 2
- ,
3
/
4
in
CAUTION
Install the pressure relief valve as close to the boiler as possible
.
No other valve should be installed between the pressure relief
valve and boiler
.
DHW Supply
Cold Water Inlet
DHW SUPPLY
Cold Water Inlet
Pressure Relief Valve