035-20209-000-A-0904
4
Unitary Products Group
•
Disconnect wire 138/PR from terminal (T3) on
contactor (M5).
•
Extend wire 136/BLK to terminal (96 / U) located
on the VLT6000 control using wires in conduit
#1.
•
Extend wire 137/BRN to terminal (97 / V).
•
Extend wire 138/PR to terminal (98 / W).
•
Connect (BLK) wire of power harness to terminal
(T1) on contactor (M5) and to terminal (91 / L1)
on the VLT6000 control using shielded cable in
conduit #2.
•
Connect (RED) wire of power harness to termi-
nal (T2) on contactor (M5) and to terminal (92 /
L2).
•
Connect (WHT) wire of power harness to termi-
nal (T3) on contactor (M5) and to terminal (93 /
L3).
•
Connect bare wire of power harness to the
grounding terminal on VLT6000 control.
13. The activation pressures are preset at the factory.
See Drive parameters below.
14. Remove existing low ambient switch (LAS) (See
Figure 8), located in the unit control box, and
replace with new 0
o
low ambient switch (provided).
15. Install additional crankcase heaters on the com-
pressors of the system to which the VLT6000 con-
trol is to be applied. Wire each additional heater
parallel to the existing heater, utilizing the existing
ground.
16. Secure wiring in the unit control box in a neat work-
man like manner using wire ties.
17. Replace terminal access cover on VLT6000 con-
trol.
18. Replace lid on VLT6000 enclosure.
19. Close unit control box by replacing unit access
panel and restore power to the unit.
20. Verify proper unit operation.
A call for cooling closes the (M5) contactor power-
ing the VLT6000 control. As the discharge pres-
sure rises above 210 PSI. during startup, the
VLT6000 control will increase the speed of the con-
denser fan accordingly.
The unit’s scroll compressor produces a rapid rise
in discharge pressure upon startup and this,
depending on the ambient temperature, will result
in full speed operation of the condenser fan. After
the discharge pressure has stabilized, the speed of
the condenser fan may decrease especially during
times when the ambient temperature is below 80
°
F.
If the discharge pressure has stabilized and an
additional compressor is energized, the speed of
the condenser fan may increase, compensating for
the rise in discharge pressure.
As the discharge pressure begins to fall below the
210 PSI. setpoint, the drive will reduce the speed of
the condenser fan.
As the ambient temperature drops below 40
°
F the
condenser fan will slow to the minimum speed. The
pressure controlled condenser fan will disengage
when the discharge pressure drops below 180
PSIG as the ambient temperature falls. The system
discharge pressure will increase when the con-
denser fan is disengaged causing the VLT6000
control to increase the condenser fan speed.
21. Contact your local branch or distributor for ques-
tions regarding installation.
NOTE:
VLT6000
See Table 3 for the parameter settings in the
drive. For specific instructions on the VLT6000,
refer to the Danfoss manual shipped with the
kit.
