Blodgett 1048 Installation Operation & Maintenance page 16

Installation
Gas Connection
PRESSURE REGULATION AND TESTING
Each section of the 1048-B series oven is rated at
120,000 BTU per hour (35.2 kW). The 1048-BL se-
ries ovens are rated at 85,000 BTU per hour (24.9
kW). At full demand, each section 1048-B requires
120 cubic feet per hour (3.2 m
cubic feet per hour (1.3 m
section 1048-BL oven requires 85 cubic feet per
3
hour (2.4 m ) Natural gas or 33 cubic feet per hour
3
(0.9 m ) Propane gas. Each oven has been ad-
justed at the factory to operate with the type of gas
specified on the rating plate.
Inlet Pressure
Natural
Min
W.C.
7.0
kPa
1.43
Manifold Pressure
Natural
W.C.
3.5
kPa
.87
Inlet Pressure --- the pressure of the gas before
D
it reaches the oven.
Manifold Pressure --- the pressure of the gas
D
as it enters the main burner(s).
Min --- the minimum pressure recommended to
D
operate the oven.
Max --- the maximum pressure at which the
D
manufacturer warrants the oven's operation.
3
) Natural gas or 47
3
) Propane gas. Each
Propane
Max Min Max
10.5 11.0 13.0
2.61 2.74 3.23
Propane
10.0
2.49
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
must be installed. It is preset to provide the oven
with 3.5" W.C. (0.87 kPa) for natural gas and 10.5"
W.C. (2.50 kPa) for Propane at the manifold.
DO NOT INSTALL AN ADDITIONAL REGULATOR
WHERE THE OVEN CONNECTS TO THE GAS
SUPPLY UNLESS THE SUPPLY EXCEEDS THE
MAXIMUM PRESSURE.
Due to the decrease in oxygen at higher eleva-
tions, above 2000', the unit may need to be re-
rated. (The orifice size may need to be adjusted to
accomodate different air pressures at higher
elevations.) If not rerated, incomplete combustion
may occur releasing Aldehydes and CO or Carbon
Monoxide. Any of these are unacceptable and
may be hazardous to the health of the operator.
Prior to connecting the oven, gas lines should be
thoroughly purged of all metal filings, shavings,
pipe dope, and other debris. After connection, the
oven should be checked for correct gas pressure.
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).
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