10/22/2008
6
BI302B
2.
Impurities within a closed loop hydronics boiler are considerably less damaging than the typical domestic water heater.
In a closed loop electric boiler, the water impurities “boil out” and the system essentially reverts to pure water. As a
closed system, this “pure water” becomes the operating mode. In the case of domestic water tank, there is always new
water entering with new impurities.
3.
However, if additives are required, use the recommendations and source from your local professional plumber,
specializing in hydronics heating systems.
WATER FILL PROCEDURE
The following procedure only applies to the prepackaged plumbing kit and/or when the system is plumbed exactly as
shown on drawing BX304.
1.
Connect the temporary household water supply source (probably hose connection) to the "supply water connection"
input.
NOTE
: If supply water connection is permanent, some local building codes may require special anti-siphon
check valve, PRZ check valve, or equivalent between the Mini Boiler fill regulator and the domestic water source
or the city water connection.
2.
Connect a drain hose to lower hose bib, "drain valve".
3.
Open
"drain valve" and
close
"inlet gate valve" (between drain valve and boiler bottom inlet).
4.
Verify “top gate valve” is
open
.
5.
Do not apply 24Ø volt heating power during water fill sequence.
6.
Open
"water supply valve" and
open
household water supply source.
This may be at normal household pressure (4Ø to 6Ø PSI), the auto-fill value regulator keeps the
hydronics loop at its proper low pressure.
7.
Allow system to circulate, discharging through drain valve,
for at least 1Ø minutes
.
8.
Put your ear against the metal pipe and listen for air bubbles. If the water flow is consistent and quiet, the system is
probably purged and water filled.
9.
Close
the "drain valve".
Open
the "inlet gate valve".
10.
The cold system pressure at the gauge should be approximately 1Ø to 14 PSI.
11.
Close
"water supply valve" and disconnect water supply.
12.
Optional – The circulating pump can be energized during this fill operation by having the 240 power main source
breaker off and simply jumpering the 2 screw terminals for the pump wire connection.