62-11039
4-8
HTCONs may be energized at the same time.) All dual
discharge style remote evaporators must have both
HTCON1 and HTCON2 on at the same time for defrost.
c.
For 3 compartment units where both
Compartment 2 and Compartment 3 evaporators are
dual air discharge style (Systems 6 & 16), and both are
calling for defrost, HTCON2 will not be on in
Compartment 1 until one of the other evaporators
terminates defrost. In this case,
2 HTCON1 and 2HTCON2 will be on in Compartment 2,
and 3HTCON1 and 3HTCON2 will be on for
Compartment 3, and only HTCON1 will be on for
Compartment 1. When either of the remote evaporators
terminate defrost and the HTCON1 & HTCON2 for that
compartment turn off, and Compartment 1 is still in
defrost, then HTCON2 will turn on for Compartment 1.
d.
For 3 compartment units where only one of the
evaporators used in Compartment 2 or Compartment 3
is a dual air discharge style, an d the other is a single air
discharge style (Systems 5, 14, & 15) the evaporator
with the dual air discharge (if it is calling for defrost) will
have both of its HTCON1 and HTCON2 on. If only one
other evaporator is calling for defrost, both HTCON1
and HTCON2 will be on in that compartment. If both
other evaporators are calling for defrost, HTCON2
priority will be determined by RAT temperature for each
compartment. The compartment with the coldest RAT
temperature of the two will have HTCON2 energized,
while the other uses only HTCON1.
When any
compartment using both HTCON1 and HTCON2 ends
defrost, if any compartment is still in defrost, and is using
only HTCON1, then HTCON2 for that compartment will
be energized.
e.
For 3 Compartment units where both
Compartment 2 and Compartment 3 have single air
discharge evaporators, and all 3 evaporators are calling
for defrost, the compartments with the coldest RAT
temperatures will use both HTCON1 and HTCON2,
while the warmest compartment will use only HTCON1
until one of the other compartments terminates defrost.
2) Defrost Initiation And Start
Defrost can be initiated by keypad, defrost timer, or
defrost air switch (Compartment 1 only). The DTT in at
least one compartment must be below 40
°
F (4.4
°
C) in
order for defrost to be initiated. Defrost will only be
performed in compartments where the DTT is 40
°
F
(4.4
°
C) or below.
During Defrost, the Defrost LED will be on, and dF will be
displayed in place of the box temperature.
NOTE
If the DTT Sensor Alarm is active, defrost initia-
tion for that compartment will be based on the
RAT temperature for that compartment. If the
RAT temperature is 45
°
F (7.2
°
C) or lower, de-
frost will be allowed in that compartment. If the
DTT and RAT alarms are both active for the
same compartment, and that compartment has
an SAT, then the SAT temperature will be used.
If the SAT temperature is 45
°
F (7.2
°
C) or lower,
defrost will be allowed in that compartment. If
both DTT and RAT alarms are active in the
same compartment, and there is no SAT, de-
frost will only be allowed if the set point is in the
frozen range.
Any time there is a DTT alarm -- if other criteria allow that
compartment to go into defrost -- that compartment will
defrost for 10 minutes, then end the defrost cycle for that
compartment.
When defrost is called for in any compartment, all
compartments will go through defrost. Cooling is not
allowed when any compartment is in defrost.
Compartments that do not require defrost (DTT above
40
_
F (4.4
_
C), or compartments that have already
completed a defrost cycle will continue with their
respective evaporator fans off, heaters off, and LSV
(s)off, and wait for any remaining compartments to
complete defrost.
When the electric heaters are used for defrost, the
engine will operate in high speed during the defrost
cycle. When electric heaters are not used for defrost,
the engine will operate in low speed.
3) Defrost Termination
When the DTT for an evaporator rises to 55
_
F (12.8
_
C),
the heaters for that compartment will turn off, the evap
fan motors will remain off, and the LSV will remain off
until all other evaporators have also terminated Defrost.
If there is a DTT sensor alarm present, that
compartment evaporator will end defrost after 10
minutes.
When Compartment 1 is operating in Return Air Defrost,
it will operate in defrost for a minimum of 5 minutes, a
maximum of 10 minutes, or until the SAT is equal to or
higher than the RAT.
During Defrost Termination, all the heaters will
de--energize, and the engine will go to low speed. dF will
continue to be displayed in the place of Box
Temperature, and the Cool LED will come on when the
compressor starts. Any compartments that call for Heat
will have the heaters come on 10 seconds after the
compressor starts.
Each compartment that is calling for cool will have the
EVXV (Compartment 1) or LSV (Compartment(s) 2
and/or 3) open, and the evaporator coils will begin to
cool down. The evaporator fans will not come on right
away, so that warm air is not blown into the
compartment, but will wait for the evaporator to cool
down, up to a maximum of 8 minutes. Once all the
evaporator fans have started, the DF will no longer be
displayed, and Box Temperature will again be shown in
the main display.
NOTE
Defrost Mode uses a Defrost Duration Timer
that allows for a maximum of 45 minutes in de-
frost. If any compartments have not automati-
cally terminated defrost during 45 minutes, the
micro will end the defrost cycle, and show the
alarm
“DEFROST NOT COMPLETE”. When this oc-
curs, the Defrost Interval Timer is set for 1.5
hours, at which time the unit will go into defrost
again.
Содержание VECTOR 1800 MT
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Страница 2: ...OPERATION SERVICE MANUAL for VECTOR 1800 MT Trailer Multi Temp Refrigeration Units ...
Страница 19: ...1 5 62 11039 1 3 SAFETY DECALS ...
Страница 20: ...1 6 62 11039 62 03958 00 Heat Warning 62 03957 01 High Voltage 62 60280 00 Standby Safety ...
Страница 21: ...1 7 62 11039 ...
Страница 303: ...10 1 62 11039 ...
Страница 310: ...10 8 62 11039 BASED ON ENGINEERING SCHEMATIC 62 60926 REV G NEXT SHT ...
Страница 311: ...10 9 62 11039 FROM PREVIOUS SHT ...