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September 1, 1997
OVERVIEW
This section is limited to the control settings
required prior to and during start-up. These
include
Traxoil Oil Safety
Pressure Settings
Plate Subcooler Controls
EPR Settings
Winter Condensing Pressure Controls
Mechanical Low Pressure Controls
Condenser Settings
Merchandiser Settings
COMPRESSOR OIL FAILURE
The Traxoil oil safety is an automatic reset device
but, because of the wiring method, it does require
a manual reset of the compressor switch. The
Traxoil will signal an alarm when the oil level
falls below 1/2 sight-glass for more than
90 seconds.
PRESSURE SETTINGS
High Pressure Safety for R-22, R-404a and R-507
is 395 psig. Differential is fixed.
High Suction Pressure is set at 50% above the
suction design setpoint (minimum of 10 psi), or to
customer specification
Satellite Low Pressure Controls
Low-end Temperature Satellites
Cut-out = 1 psig
High-end Medium Temperature Satellites
R
C
EFRIGERANT
R-404a/507
R22
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CONTROL SETTINGS
-
C
-
UT
OUT
UT
IN
36
59
29
49
PLATE SUBCOOLING CONTROLS
Thermostat setting is 50 deg F, with minimum dif-
ferential, or customer specification.
The TEV should be set with the highest possible
superheat that will still maintain the desired liquid
temperature.
EPR setting, if used, is on the store legend.
EPR SETTINGS
The pressure settings are based on a nominal
2 psig pressure drop in the suction line when the
EPR control is mounted in the machine room.
E
VAPORATOR
T
EMPERATURE
-25
-22
-20
-15
6
9
12
15
18
21
25
30
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
P/N 401789
7 - 1
R-404a/507
R-22
11
5
13
7
14
8
18
12
37
27
41
30
44
33
47
36
51
39
55
42
60
47
68
53
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