Middleby Cooking Systems Group PS360/PS360WB - Manual (Page 39)

2-25
SECTION 2
INSTALLATION
Figure 2-35
Flexible Hose Connector Installation
Appliance
Connection/
Male Nipple
Flexible Hose
Correct Position
Full-Flow Gas
Shutoff Valve
To Gas
Supply Pipe
90° ST
Elbow
Union
VII. GAS SUPPLY FOR GAS HEATED OVENS
Pipe sizing -- Always install a shut off valve in the gas supply
line to the oven. This valve should be the same size as the
supply line.
Please remember that the longer the pipe runs, the more the
pressure drops. One 90° elbow equals a 1,2 m length of pipe.
Each oven section requires a nominal gas input as follows:
PS360U,L (per oven) 40 kW
PS360WB-U, -L (per oven) 50 kW
Follow the recommended pipe sizing and meter sizing as
indicated in the Rough-in Drawing (Figure 2-31,Page 2-22).
The flexible hose furnished with the oven must be positioned
as shown in Figure 2-35.
NOTE: The recommended pipe sizes are larger than usually
required to eliminate any operation problems. It is much less
expensive to make the initial installation large enough to do the
job rather than redoing the job later.
For lighting instructions, refer to Step-by-Step Operation in the
OPERATION Section of this manual.
CAUTION
DURING PRESSURE TESTING NOTE ONE OF THE
FOLLOWING:
1. 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 pressure in
excess of 1/2 psig (3.45 kPA).
2. 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 supply piping
system at test pressure equal to or less than 1/2 psig (3.45
kPA).
3. If the incoming pressure is over 50 mbars, a separate
regulator must be installed before the 3/4” manual gas
shutoff valve located at the rear outside of the oven.
WARNING:
To prevent damage to control
valve regulator during initial
turn on of gas, it is very
important to open manual
shutoff valve very slowly.
After the initial gas turn on, the
manual shutoff valve must
remain open except during
pressure testing as outlined in
the above steps or when
necessary during service
maintenance.