English – Middleby Marshall PS360WB-U User Manual

Page 14

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14

ENGLISH

E. Checking the Gas Supply (Inlet) Pressure
1. Remove the supply (inlet) pressure cap screw from the

multifunction gas valve. Attach a manometer to the stud.

2. Depress the machinery compartment safety switch to

allow the oven to operate.

3. Open the main gas supply valve. Switch the circuit breaker/

fused disconnect to the ON ("I") position.

4. Start the oven and adjust the temperature controller to the

maximum setting (288°C).

5. Measure the supply (inlet) pressure.
6. Switch the oven off. Close the main gas supply valve, and

switch the circuit breaker/fused disconnect to the OFF ("O")

position. Remove the manometer, and replace the cap

screw onto the multifunction gas valve.

7. Compare the measured supply (inlet) pressure to the

nominal pressures shown in the Gas Orifices and Pressure

Specifications table.

If the supply pressure is lower or higher than the nominal

pressure, the reason should be investigated and the gas

supplier contacted.
For natural gas ovens, if the measured supply pressure is lower

than 17mbar, or higher than 25mbar, contact the gas supplier.

DO NOT OPERATE THE OVEN or adjust the oven controls.

F. Adjusting the Orifice (Manifold) Pressure and Heat Input
To use the orifice pressure method, you must know the specific

gas type and quality used. If using the orifice pressure method,

you should double-check the input using the volumetric method.
To use the volumetric method, you must know the heat value

(HuB) of the gas used. This information is available from your

gas supplier.
During these measurements, do not operate any other

appliances that use the same gas meter as the oven.
1. Orifice (Manifold) Pressure Method

a. Check that the main gas supply valve and the circuit

breaker/fused disconnect are in the OFF ("O") position.

b. Remove the regulated (manifold) pressure cap screw

from the multifunction gas valve. Attach a manometer

to the stud.

c. Remove the cap screw from the pressure adjustment

screw (governor) on the multifunction gas valve.

d. Depress the machinery compartment safety switch to

allow the oven to operate.

e. Open the main gas supply valve. Switch the circuit

breaker/fused disconnect to the ON ("I") position.

f.

Start the oven and adjust the temperature controller to

the maximum setting (288°C).

g. Adjust the pressure adjustment screw as necessary

to match the correct pressure for the oven's specific

gas type. Refer to the Gas Orifices and Pressure

Specifications table. Turning the adjustment screw

clockwise increases the flow, while turning it

counterclockwise reduces the flow.

h. Switch the oven off. Close the main gas supply valve,

and switch the circuit breaker/fused disconnect to the

OFF ("O") position. Remove the manometer, and

replace the cap screws onto the multifunction gas

valve.

Consumption (m

3

/hr.) =

NB (Rated input in kW)

HuB (Heat [Calorific] value

of gas in kW/m3)

=

Time (in minutes) of

0.1m3 of gas usage

2. Volumetric Method

a. Determine the time of 0.1m

3

(100 liters) of gas usage

as follows.

b. Check that the main gas supply valve and the circuit

breaker/fused disconnect are in the OFF ("O") position.

c. Remove the cap screw from the pressure adjustment

screw (governor) on the multifunction gas valve.

d. Depress the machinery compartment safety switch to

allow the oven to operate.

e. Open the main gas supply valve. Switch the circuit

breaker/fused disconnect to the ON ("I") position.

f.

Start the oven and adjust the temperature controller to

the maximum setting (288°C).

g. Adjust the pressure adjustment screw as necessary

to match the calculated volume using the time (in

minutes) of 0.1m

3

of gas usage. Turning the

adjustment screw clockwise increases the flow, while

turning it counterclockwise reduces the flow.

h. Record the reading obtained from the gas meter and

calculate the obtained gas flow. Compare this value

to the information in the Gas Orifices and Pressure

Specifications table.

i.

Switch the oven off. Close the main gas supply valve,

and switch the circuit breaker/fused disconnect to the

OFF ("O") position. Replace the cap screw onto the

multifunction gas valve.

6

Consumption

SECTION 2 - INSTALLATION

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