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ELECTRICAL
4 - 28
OTHER CONTROLS
Each control panel is wired with independent com-
pressor control circuits so any compressor can be
electrically isolated without causing the other com-
pressors to be shut down.
Time Delays
Automatic time delays on the Scroll Plus™
System help avoid electrical overload or compo-
nent damage. Awareness of time delays will
reduce confusion in starting and troubleshooting
the system.
Hussmann's EPC-2000 provides both anti-short
cycle and stagger-start delays. During switchback
operation when the EPC-2000 is not controlling
the system, sensible delays, safeties and controls
can maintain less
efficient operation. These backup systems are tai-
lored to individual customers. Check the store
legend for component listing
Alarm Delays
Alarm delays are used where trip points are
passed in normal operation, yet system damage
would result if cause continued beyond the timed
delay.
Compressor oil pressure failure
Copeland—120 seconds ±15 seconds
Carlyle—60 seconds ±15 seconds
Low liquid level—30 minutes
High suction level pressure—30 minutes
(for EPC-2000 not needed or recommended)
Faulty defrost timer motor—30 minutes
(not available with Paragon timer)
Copeland Solid-state Delay
Copeland compressors equipped with an internal
solid-state protector cycle 120 seconds after
power break.
Thermostats
E
M
L
VAPORATOR
OUNTED
Wire the thermostat in series with the liquid line
solenoid. Any 120V uninterrupted power supply
may be used.
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
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L
S
IQUID
INE
OLENOID
H
M
L
EADER
OUNTED
IQUID
Wire the thermostat in the following manner.
Determine the system number from the store leg-
end. In the control panel the system number
matches the suffix of the appropriate "T" and "B"
terminals.
Remove the jumper between T_ and B_ terminals.
Connect one thermostat wire to the T_ terminal.
Connect the other wire to the B_ terminal.
5 Amp Fuse
Field Supplied
T__
Fi
4 25 R f i
Figure 4-22 — Refrigeration Thermostat
w/ Header Mounted Solenoid
Defrost Termination Thermostats
For each system using defrost termination ther-
mostats, run one 2-wire control circuit placing all
termination thermostats in series and connected
between the R_ and F_ terminals in the control
panel with the suffix corresponding to the system
number. Check the store legend for system num-
ber.
R__
2 Amp Fuse
Field Supplied
Merchandiser Thermostats (One per Unit)
Figure 4-23 — Wiring Defrost Termination
Thermostats
September 1, 1997
L
S
INE
OLENOID
5 Amp Fuse
Field Supplied
B__
i
Th
F__
2 Amp Fuse
Field Supplied
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