Modine Manufacturing POR Installation And Service Manual page 8

installation
figure 8.1
two Pipe system
table 8.1
equivalent length of straight Pipe or tubing (feet)
fitting 3/8" o.d.
type tube
90° ell 1.4
45° ell 0.5
tee 0.5
multiple unit supply
To save piping, oil tanks, and provide flexibility to extend pipe
supply lines to multiple-unit installations, a centralized oil
distribution system may be installed with a booster pump, oil
safety valves, and vacuum breaker. Figures 9.1 and 9.2 illustrate
typical loop and pressurized oil supply systems. In each of these
systems the unit heater is installed as in a one-pipe system.
BE SURE TO REMOVE THE BYPASS PLUG FROM THE
FUEL UNIT WHEN IT IS CONNECTED TO A ONE-PIPE OIL
SYSTEM.
The loop system utilizes a vacuum breaker to assure an instant
supply of oil to all units. NFPA requires that oil pressure at the
fuel unit does not exceed 3 PSIG.
For multiple-unit systems, as shown in Figures 9.1 and 9.2,
install a generous-capacity oil filter in the inlet line to booster
pump suction line. Refer to Figure 6.2 for a typical wiring
diagram for multiple unit installations.
8
1/2" o.d. 1/2" i.P.s. 3/4" i.P.s
tube Pipe
1.4 1.7
0.5 0.8
0.5 0.7
oil tanks
To provide for a safe and continuous fuel supply, the tanks
and piping to the unit heaters must be installed in accordance
with state and local codes and must conform to applicable
Pipe
sections of NFPA No. 31, "Installation of Oil Burning Equipment."
2.1
Keep oil storage tank filled, even during summer, to prevent
1.0
condensation of water vapor. To prevent air locks, storage tank
1.1
should not be filled while units are operating. If oil tank runs dry,
it may be necessary to vent the air from lines and fuel unit when
re-starting the burner.
figure 8.2
Piping connection to fuel unit two-Pipe system
4-522.4