J.
COMBINATION GAS VALVE
The 24 VAC
combination
gas
valve
serves
three
(3)
functions:
(1)
manual
gas
shut-off,
(2)
main
gas
flame
pressure
regulator,
(3)
automatic
electric
redundant
(double
seated)
gas
shut
off.
(See
Figure 11)
The correct operating manifold
orifice
pressure
range
for
both
natural
and
propane
gas
is
2.0" W.C.
(498.2Pa)
minimum to 4.0" W.C.
(996.aPa)
maximum. By adjusting
the
pressure
regulator
between 2.0"
W.C.
(498.2Pa)
and 4.0' W.C.
(996.4Pa)
on
either natural
or
propane gas,
a
wide
input range can be achieved with a
single
orifice
size.
lf the desired
input
rating cannot be obtained within
the above manifold orifice
pressure
adjustment
range, the next
size
larger
or smaller orifice should
be
used.
(Referto
orifice
chart Fig.
10.)
PRESSURE REGULATOR
ADJ USTMENT
The combination
gas
valve
pressure
regulator,
which has an outlet
pressure
setting
range
of
PRESSURE
REGUI-ATOR
approximately 2.0"
W.C.
(498.2Pa)
to 4.0" W.C.
(996.4Pa)
is factory
set
at
3.5'
W.C
(871.85Pa).
When
pressure
adjustment
is required
for
setting
input capacity with a selected orifice
from
Figure 10,
remove the regulator cap for access
to the slotted
adjustment screw.
Turning the
screw counter
clockwise
reduces
manifold orifice
pressure,
clockwise
increases
the
pressure.
NOTE: MANIFOLD PRESSURE ADJUSTMENTS
CAN ONLY
BE MADE WITH
THE
BURNER RUNNING AND THE
GAS ON.
The 1/8"
(3.175mm)
NPT
pressure
tap
for
orifice
manifold
pressure
measurement is located
on the
outlet
side
of the combination
gas
valve.
Use a
"u"
tube
manometer or dial type
pressure
gauge,
scaled
from
"0"
zero lo
15.0' W.C.
(3736.5Pa)
to
read
pressure (See
Figure 11).
PRESSURE
REGULATOR
1/8"
(3.175mm)
NPT
PRESSURE TAP PLUG
HSG 2OOI4OO GAS
VALVE
HONEYWELL VR83O5
t
/ANUAL
CONTROL
KNOB
(SHOWN
tN
oFF
POSmON)
HSG4OO
GAS VALVE
ROBERTSHAW
TOOO
DERHC
Figure 11
PAGE 6
I.
COMBINATION GAS VALVE
The 24
VAC
combination gas valve serves three
(3)
functions:
(1)
manual gas shut-off,
(2)
main gas
flame pressure regulator,
(3)
automatic electric
redundant (double seated) gas shut off. (See
Figure
11)
The correct operating manifold orifice pressure range
for both natural
and
propane gas
is
2.0"
WC.
(498.2Pa) minimum to 4.0" W.C. (996.4Pa)
maximum.
By
adjusting the pressure regulator
between 2.0"
WC.
(498.2Pa) and 4.0"
WC.
(996.4Pa)
on
either natural or propane gas, a wide
input range can
be
achieved with a single orifice size.
If the desired input rating cannot
be
obtained within
the above manifold orifice pressure adjustment
range, the next size larger or smaller orifice should
be
used. (Refer to orifice chart
Fig.
10.)
J. PRESSURE REGULATOR ADJUSTMENT
The combination gas valve pressure regulator,
which has
an
outlet pressure setting range of
approximately 2.0"
WC.
(498.2Pa) to 4.0"
WC.
(996.4Pa) is factory set at 3.5"
WC
(871.85Pa).
When pressure adjustment
is
required for setting
input capacity with a selected orifice from Figure 10,
remove the regulator cap for access to the slotted
adjustment screw. Turning the screw counter
clockwise reduces manifold orifice pressure,
clockwise increases the pressure.
NOTE: MANIFOLD PRESSURE ADJUSTMENTS
CAN ONLY
BE
MADE
WITH
THE
BURNER RUNNING AND THE GAS ON.
The 1/8" (3.175mm) NPT pressure tap for orifice
manifold pressure measurement is located
on
the
outlet side of the combination gas valve. Use a "u"
tube manometer or dial type pressure gauge,
scaled from "0" zero to 15.0"
WC.
(3736.5Pa) to
read pressure (See Figure
11).
PRESSURE
REGULATOR
MANUAl CONTROL
KNOB
(SHOWN
IN
OFF
pOSmON)
1/8" (3.175mm) NPT
PRESSURE TAP
PLUG
INLET
MANUAL CONTROL
KNOB
(SHO'olN IN
orr POSITION)
118"
(3.175mm) NPT
PRESSURE TAP PLUG
HSG400 GAS
VALVE
ROBERTSHAW 7000 DERHC
HSG
200/400
GAS VALVE
HONEYWELL VR8305
Figure
11
PAGE 6
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