Pennco 3KW0.60 - Manual (Page 20)

20
HOT WATER SYSTEM OPERATION
Entire heating system (boiler, piping, and radiation units)
is filled with water. As boiler water boiler is heated, it
is circulated from top of boiler through supply main to
radiation units. Cooler water in radiation units flows back
through return piping through return main into boiler. This
arrangement provides positive and rapid response to the
thermostat.
FILLING SYSTEM WITH WATER
OPTION #1 Method utilizes boiler piping as shown in
figures in the “System Piping” section.
a) Close main shutoff valve, isolation valves, and zone
valves (if applicable). If bypass piping is installed, also
close two throttling valves. Leave boiler service shutoff
valve (if installed) and balancing valves to each heating
zone fully open.
b) Open following valves in order: drain valve for power
purging, isolating valves before and after boiler circulator (if
applicable), both throttling valves (if applicable), and then
open fill line shutoff valve. Water will fill bypass piping and
push air through piping and out power purging drain valve.
When power purging drain valve runs air free, close bypass
piping throttling valve (leaving throttling valve to supply
piping fully open).
c) Next, open isolation valve (or zone valve) to first zone.
Water fills piping and pushes any air out power purging drain
valve. When power purging drain valve runs air free, close
isolation valve (or zone valve). Repeat this procedure for
remaining heating zones.
d) Once all zones are filled with water and purged of air,
close power purging drain valve and fill line shut off valve,
open main shutoff valve, and adjust throttling valves and
balancing valves as required.
OPTION #2 Close air vents on all radiation units.
Open valves to radiation units. Verify boiler drain valve,
expansion tank drain cock, and air bleed screw on
expansion tank drain fitting are closed. Open fill valve on
piping to expansion tank. Open water inlet to boiler and
leave open. Open air vent on lowest radiation unit. When all
air has escaped and water starts to flow from vent, close it.
Go to next radiation unit, and repeat this process finishing
with highest radiation unit. If heating system has automatic
vents, manual venting is unnecessary but will speed up
proper filling of system.
If system is closed expansion tank system, automatic fill
valve is needed. Leave automatic fill valve open to refill
system automatically as needed. Note initial fill pressure
on boiler’s temperature/pressure gauge should be 10-15
psig. Any lowering of pressure from its initial fill pressure
indicates loss of water due to leakage. Automatic fill valve
should compensate for this water pressure loss. If it does
not, manually open this valve to refill system until needle is
again pointing to same pressure reading. Instructions are
packaged with valve.
FILLING THE BOILER