Honeywell Hauck MEGASTAR MS-25 Instructions Manual page 29

7. Adjustment of LP supply pressure: (see Table 13 for recommended settings).
a. Install an amp probe on the LP pump power supply line.
Do not exceed the minimum LP pump motor nameplate
amp load at any time while making adjustments.
b. Close the ball valve between the back pressure regulator and the tank to temporarily
take the regulator out of the system (see Figure 13).
c. The bypass flow control valve is used as a system safety. Normally set at 50 psig
(345 kPa) above the maximum expected tank pressure, it operates only in the case of
a back pressure regulator failure.
d. Adjust the bypass flow control valve to the following initial settings:
If pump motor nameplate amperage is exceeded, reduce
pressure in Step 7.d to below nameplate amp rating.
e. The back pressure regulator functions as the primary control in setting the LP supply
pressure to the burner. To adjust the back pressure regulator, open the ball valve
between of the back pressure regulator and the tank, and adjust the regulator to an
initial setting of 25 psig (172 kPa) below the flow control valve setting.
f. Adjust the back pressure regulator to the following initial settings:
Frost or icing is an indication of an LP leak. It is possible
for a leak to occur without such evidence. Although the
LP supply is initially in a liquid state, as it is vaporized it
becomes heavier than air and accumulates near the
ground and dissipates relatively slowly, becoming highly
flammable. Extreme care should be exercised with LP
fuels and systems.
100% Commercial Propane
50/50 Propane/Butane
100% Butane
100% Commercial Propane
50/50 Propane/Butane
100% Butane
WARNING
CAUTION
235 psig (16.20 bar)
170 psig (11.70 bar)
95 psig (6.55 bar)
NOTE
210 psig (14.50 bar)
145 psig (10.00 bar)
70 psig (4.80 bar)
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MS-9