Blodgett MT3870 Installation, Operation & Maintenance Manual page 18

Installation
Gas Connection
PRESSURE REGULATION AND TESTING
MT3870 ovens are rated at 150,000 BTU/Hr. (43.9
kW/Hr.) (158 MJ/Hr.) Each oven has been ad-
justed at the factory to operate with the type of gas
specified on the rating plate attached to the left
side of the control panel.
Each oven is supplied with a regulator to maintain
the proper gas pressure. The regulator is essen-
tial to the proper operation of the oven and
should not be removed. It is preset to provide the
oven with 3.5" W.C. (0.87 kPa) for natural gas and
10.0" W.C. (2.50 kPa) for Propane while the flame
is on. The regulator is located on top of the gas
valve, between the manual shutoff and solenoid
valves.
DO NOT INSTALL AN ADDITIONAL REGULATOR
WHERE THE OVEN CONNECTS TO THE GAS
SUPPLY UNLESS THE SUPPLY EXCEEDS THE
MAXIMUM PRESSURE.
NOTE: The maximum gas supply pressure to the
oven is 10.5" W.C. (2.61 kPa) for natural
gas and 13" W.C. (3.2 kPa) for Propane
gas. The minimum gas supply pressure to
the oven is 4.5" W.C. (1.1 kPa) for natural
gas and 11.0" W.C. (2.74 kPa) for Propane
gas.
Gas Connection 5" (127 mm)
Installation must conform with local codes, or in
the absence of local codes, with the National Fuel
Gas Code, NFPA54/ANSI Z223.1 ---Latest Edition,
the Natural Gas Installation Code CAN/CGA-
B149.1 or the Propane Installation Code, CAN/
CGA-B149.2 as applicable.
The oven and its individual shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 1/2 psig (3.45kPa).
The oven must be isolated from the gas supply
piping system by closing its individual manual
shutoff valve during any pressure testing of the
gas piping system at test pressures equal or less
than 1/2 psig (3.45kPa).
Gas Connection 6.5" (165 mm)
Figure 20
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