Thermo King 914970, Руководство пользователя, Страница: 33 / 186

Operating Instructions
33
NOTE: The
E
NTER
key must be pressed within 6
seconds after releasing the
U
P
or
D
OWN
key to
complete the setpoint change.
L
OW
N
OISE
Key:
Used to lock out high speed
operation to maintain low speed (low noise)
operation.
With the unit switched off, the controller screens
will be dark; nothing will be on the display. When
the unit is switched On, all symbols and readouts
will be displayed for about 10 seconds. Make sure
that all display segments are operational.
Standard Display is set to Return Air Temperature
at the factory. Each controller can be programmed
to show return air or setpoint as the Standard
Display.
When unit is switched off, it is normal for display
to remain On for about 30 seconds.
With power off or battery disconnected, all
settings are saved in the controller memory and
become active when unit is switched On.
During the normal operation, the Standard
Display is on the screen.
Return Air Temperature is factory Standard
Display setting (can be changed). Other operating
data can be displayed.
To view other operating data, repeatedly press and
release the
S
ELECT
key.
The following data may be displayed:
• Discharge Air Temperature
• Setpoint Temperature
• Press
S
ELECT
key for next display.
The remote control box is replaced with an
electric standby power receptacle on units that are
equipped with the cab control box.
Remote Control Box Outside
(Optional)
The switches in the remote control box energize
relays on the option board to control the operation
of the unit. The remote On/Off switch and the unit
On/Off switch must both be in the On position for
the unit to operate. Either switch will turn the unit
off.
The remote control box mounts on the truck body
beneath the unit to offer easier accessibility to unit
controls. This box offers the following functions:
Preheat/Start Switch:
When pressed to Preheat,
the switch energizes the glow plugs to aid in
starting. When pressed to Start, it energizes both
the glow plugs and the starter motor.
On/Off Switch:
The On/Off switch energizes the
On relay, activating the unit electrical system. The
control panel On/Off switch and the remote
On/Off switch must both be On in order for the
unit to operate. Either switch can stop the unit.
Manual Defrost:
Pressing the Manual Defrost
switch will initiate a Defrost cycle if the
evaporator coil temperature is below
42.0 F(5.6 C).
Diesel/Electric Switch (Model 50 only):
Switches
the unit to electric motor standby power when
placed in Electric position and power cord is
connected to the box.
Other Controls
Defrost Termination Switch:
A temperature
sensitive switch is mounted on the evaporator
coil. It is used to control Defrost. The switch
closes when the evaporator temperature drops to
42 F (6 C). This enables Defrost.
Defrost Air Switch:
The Defrost Air switch senses
the air pressure difference between the evaporator
coil inlet and outlet. The switch automatically
places the unit on Defrost when the evaporator
temperature is below 42.0 F (5.6 C) and frost
builds up on the coil to a point where the air flow
across the coil is restricted.