Bryant 246 - Gas Controls and Main Gas Connections; Gas Pressure Regulator; D2 and D5 Gas Controls

SEP/04/2008/THU 09:17 AM UTC TECH PUB
FAX No. 317 240 5662
F. 013/018
When the operating control or room thermostat is
satisfied, the control valve closes the escapement and
opens the supply port to allow gas pressure to build
up bn top of the diaphragm. When the pressure above
and.below the diaphragm is equal, a spring or weight
reseats the diaphragm and the main gas flow is
shutoff.
Additional force (spring or weight) ie applied to the
upper side of the diaphragm to ensure that no gas will
flow to the burners unless there is sufficient pressure
differential.
Gas Pressure Regulator'
The regulator contains a flexible diaphragm which
operates a valve. With no gas flow, the valve is wide
open. As gas is supplied and the pressure increases,
the diaphragm ie pushed up against the force of a
spring until the gas pressure and spring force are
equal. The valve has now been pulled up, blocking
some of the gas supply, resulting in constant pressure
gas at;'the burner. Any fluctuations will pause the
valve to be repositioned, thus keeping the pressure
constant.
TABLE Vlll-Gas Controls and Main Gas Connections
Control Type >
Gas Type
Boiler Type
D2. ••
Propane
Water
100% Shutoff
. ■ ■
. & .
: 24 Vo ft •
■ " . \ ' : _ i '•
Steam
Thermocouple pilot
' ' . ''' ; D4- ■ 7 ' j Natural
•, Water
/, 24 VpItV/r ' ■ ;
i Bryant 'pi,[ot. ••/.
' ■ . > ' :'/ ■ • V
XT' Steam
■ V • " ■ /. D5. : :
Natural Water
k" -ioo% shutoff // ■ "
•' '
&
■ ; 24 Volt:/,
! ./ Steam
. Thermocouple .pilot
- / '
D6 (4, iS, ■ & :6 size only) '
v:; 1 .Natural'/''; J
Water
' ■ 750 Millivolt ';
\r 'v"‘ '• TV'"- ;
•'Thermbpile: pilot ■
•• ‘V/’ -•
Steam
" _ Control Components _
1. 100% pilot shutoff relay
2. Thermocouple pilot
3. Transformer . ■ ■■ • ■ , ..
4. -Bryant automatic gas valve or controller
1. Bryant automatic pilot
2. Bryant automatic gas valve or controller
3. Gas pressure regulator
4. Transformer ' ■ - ' 1 _
1. 100% pilot shutoff relay
2. Thermocouple ; p ilot
3. Transformer. . , .
4. Bryant automatic gas valve or controller
5. Gas pressure regulator _ ' " ••
1. Thermopile pilot
2. 750-Millivolt automatic gas valve
3. Gas pressure regulator