Lochinvar Power-Fin 502 Installation & Operation Manual page 33

3
Gas connections
High and low gas pressure switches
TYPICAL PRESSURE REGULATOR
STYLE MAY VARY FROM SHOWN
"FIELD PROVIDED"
(IF REQUIRED BY LOCAL CODES)
TYPICAL SHUTOFF
VALVE
"FIELD PROVIDED"
(IF REQUIRED BY LOCAL CODES)
BALL VALVE
W/PRESSURE TAP
*SEE REGULATOR
INSTALLATION
NOTE ON PAGE 33
Figure 3-3A_PB/PF 502 - 1302 F9 High & Low Gas
Pressure Switches
TYPICAL PRESSURE REGULATOR
STYLE MAY VARY FROM SHOWN
"FIELD PROVIDED"
(IF REQUIRED BY LOCAL CODES)
TYPICAL SHUTOFF
VALVE
"FIELD PROVIDED"
(IF REQUIRED BY LOCAL CODES)
BALL VALVE
W/PRESSURE TAP
*SEE REGULATOR
INSTALLATION
NOTE ON PAGE 33
Figure 3-3B_PB/PF 502 - 1302 M9 High & Low Gas
Pressure Switches
TYPICAL PRESSURE REGULATOR
STYLE MAY VARY FROM SHOWN
"FIELD PROVIDED"
(IF REQUIRED BY LOCAL CODES)
TYPICAL SHUTOFF
VALVE
"FIELD PROVIDED"
(IF REQUIRED BY LOCAL CODES)
BALL VALVE
W/PRESSURE TAP
*SEE REGULATOR
INSTALLATION
NOTE ON PAGE 33
Figure 3-3C_PB/PF 1501 - 2001 M9 & B9 High & Low
Gas Pressure Switches
The gas train and controls assembly provided
NOTICE
on this unit have been tested under the
applicable American National Standard to
meet minimum safety and performance
criteria such as safe lighting, combustion,
and safety shutdown operation.
(continued)
REGULATING
GAS VALVE
GAS COCK
GAS VALVE
ALUMINUM
HIGH GAS
TUBING
PRESSURE
.25 X .03
SWITCH
ROUTING MAY VARY
GAS
VALVE
GAS COCK
LOW
PRESSURE
SWITCH
ALUMINUM
HIGH
TUBING
PRESSURE
.25 X .03
SWITCH
ROUTING MAY VARY
GAS VALVE
BALL VALVE
LOW
PRESSURE
SWITCH
ALUMINUM
HIGH
TUBING
PRESSURE
.25 X .03
SWITCH
ROUTING MAY VARY
(continued)
F9 gas train
The combination gas valve on this appliance uses line (120
VAC) voltage for operation. These two valves satisfy the
requirement for the safety shutoff and operating valves
LOW GAS
required on boilers and water heaters. The combination valve
PRESSURE
SWITCH
also regulates the amount of gas mixed with the air delivered
to the burner for proper combustion. Both the combination
valve and diaphragm valve have threaded vents - see the
Venting of Gas Train Components section, this page.
There are no serviceable parts on the combination gas valve.
DOWNSTREAM
TEST VALVE
VENTURI
Figure 3-4_Gas Train Assembly F9 - Models 502 - 1302
M9/B9 gas train
The ratio gas valve on this appliance uses line (120 VAC)
voltage for operation. The valve contains the safety shutoff
and operating valves required on boilers and water heaters.
The ratio valve uses the negative pressure signal generated by
the venturi to modulate the amount of gas, so that the proper
mixture of air and gas is delivered to the burner throughout
the full range of burner operation. The ratio gas valve does not
require installation of a vent line - see the Venting of Gas Train
Components section below.
There are no serviceable parts on the combination gas valve.
VENTURI
DOWNSTREAM
TEST VALVE
Figure 3-5_Gas Train Assembly M9/B9 - Models 1501
- 2001
Venting of gas train components - F9/B9/M9
and optional gas train components
Local codes may require the routing component bleeds and
vents to the atmosphere outside the building. Components
(valves, pressure switches) having vents which would require
external vent lines are provided with threaded vent line
connections. These vent line connection points may be accessed
by removing the top jacket panels. Proper routing of vent lines
to the atmosphere from the factory supplied termination
points is the responsibility of the installing contractor.
Installation & Operation Manual
MANUAL SHUTOFF VALVE
DIAPHRAM VALVE
COMBINATION VALVE
MANUAL SHUTOFF VALVE
RATIO VALVE
33