20.
PRESSURE
XEASURING
DEVICES
The pressure at the burner should be checked at the time the refrigerator is started
up, After connecting the pressure gauge, set the thermostat dial at
"i.'ky".
Turn on
the gas at the union cock and light tile burner. At the
“:Xx”
setting the pressure
reading should be
11”
(280 mm).
The L.P. gas is supplied directly to the thermostat
from the regulator fitted on the gas bottle at pressure of 11” (280
nn).
Water U gauge (fig, 67)
The water gauge consists of a glass
U
tube filled to
rrid-point
with water.
Khen
Eas
pressure is exerted on one side of the gauge, the water on
tha-t
side is forced down
and there is a corresponding rise of water on the other side.
Water column pressure per square inch is indicated
by
the difference of the two
columns of water measured in inches.
A convenient scale reading in inches and tenths of an inch is
rounted
bctveen the
two columns.
When reading the gauge proceed as follows
:
If the gauge is filled with water to zero and the lower column is 5.5 inches
(140
mm)
below zero, the other column will also be 5.5 inches (140
IX).
By adding
the tvo together 5.5 + 5.5
-
11 inches (280 mm) water column,
For accuracy of measurement a vater
L’
gauge is far superior to a low pressure gauge.
If a low pressure gauge is used,
it should be checked for accuracy against a water
C
gauge occasionally .
WATER U
IF--
.
GAUGE
Adopter
Part No.
33 87
2.9~GOI4
Fig.
GE
LOW PRESSURE GAUGE
Low pressure gauge (Fischer) (fig, 64)
This gauge is calibrated to read in
“inches of water column pressure”. It is a
standard manometer reading and is colored red.
How to use the pressure gauge
When testing the pressure at the burner,
remove the plug indicated with an arrow in
fig. 67 and fit the hose from the pressure gauge. Use adapter, part
Ko,
33 87 59-031
It is very important that the gas operated refrigerators operate at correct pressure
i.e.
at the pressure stipulated for the refrigerator.
21.
OPERATING
RECOWENDATIONS
Experience over many years shows that incorrect installation and adjustments are
major causes for unsatisfactory refrigeration.
To Next Page
Loading...
Need help?
General
