Armstrong 21AR Installazione e manutenzione - Pagina 5

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TO DRAIN
PET COCK
ARMSTRONG
HIGH POINT ON
WATER MAIN
Fig. 1. Air vent on high point of
main of hydronic heating system.
Test pet cock is optional. Gate valve
for isolating vent to permit cleaning
and repair if necessary.
T E S T
ARMSTRONG
P E T C
A I R V E N T
T U B I N G T O
FLOOR
OR SLOP SINK
W A T E R
P I P I N G
F i g . 4 - I n s t a l l a t i o n o f a u t o m a t i c a'r v e n t o n
piping.
TEST PET COCK
ARMSTRONG
AIR VENT
HOT WATER
UNIT HEATER
Fig.
hot
water unit
heater.
ARMSTRONG 21AR AND 21-312AR AIR VENTS
NO.21
RETURN
Fig. 2. Vent to remove air when fill-
ing tank with liquid. If moderate
amounts of air must be vented after
tank is filled use 3/4" pipe and a
isolated for cleaning and/or repair).
NO.21
DRAIN
F i g . 5 -1nstollation
loop
in
piping.
NO.21
NO. 21
o f automatic
air v e n t o n
V A L V E LEVEP
Fig..3 Hook up for No. 21AR to
vent surplus air from a water storage
tank. If vent is to be isolated use gate
valves. Pipe size can be l/2". Line
A-A shows water level - position vent
to secure level desired.
TO DRAIN
- - T E S T P E T C O C K
'ARMSTRONG NO. 21 AIR VENT
VENTING
COIL
F i g . 6 - I n s t a l l a t i o n o f a u t o m a t i c
panel
coil.
V A L V E LEVEE