Hussmann microSC VRL1B - Page 19

HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
VRL Merchandisers
P/N 3034040_H 19
CONTROLLER
Hussmann Controller Operation RTN
The Controller controls refrigeration temperature.
This is factory installed in the control panel.
Defrosts are time initiated and temperature ter-
minated for self contained. The defrost setting
is factory set as shown above. To ensure a thor-
ough defrost, defrost must be terminated by the
temperature termination setting — not by time.
1. Plug the merchandiser plug into its receptacle.
a. The controller display will illuminate.
b. The interior light will illuminate.
2. After the control preprogrammed time
delay of up to 6 minutes, the compressor and
evaporator fan(s) will start if the control is
calling for cooling.
3. The control will cycle the compressor but
may also cycle evaporator fan(s) on and off
determined by the Set-Point and Differential
temperatures.
a. The Set-Point is the adjustable
preprogrammed temperature.
b. The Differential is the non-adjustable pre
programmed temperature.
c. The Control is designed to read and display
a cabinet temperature not a product
temperature.
This cabinet temperature may reflect the
refrigeration cycle of the Set-Point and it’s
Differential. The most accurate temperature
on a cabinets operation is to verify the product
temperature.
Taking as an example a VRL case, freezer, If the
Set-Point is -12°F and the Differential is 9°F.
(Set-Point) -12°F + 9 (Differential) = -3°F. The
compressor and evaporator fan(s) will cycle off
-12°F and back on at -3°F.
Main Features:
• Panel-mounted
• Energy saving algorithms and optimised
defrost control
• 8 preloaded applications
• Defrost at single / double evaporator
• Frame Heater
• Local network auto-conguration
• Direct load connection (up to 2 HP)
• Supply voltage control LVD
• Presence of an open collector output
Model Product Application Controller Set Point ( ° F ) Defrost Frequency ( per day ) Type of Defrost Temp. Termination Failsafe time ( min )
VRL1
-20 ° F ( - 29 ° C )
2
VRL2
-14.5 ° F ( -25.8 ° C )
2
VRL3
-12 ° F ( - 24 ° C ) 2
Electric
48 ° F ( 9 ° C )
50
Frozen Food
3032520_B
FIX IN THE
SUCTION TUBE
SENSOR
DEFROST
SENSOR
AIR DISCHARGE
FIX IN THE WALL
VRM2B
C
DETAIL C
SCALE 1:2.67
ROOF LINE
3.38
ROOF TO
SENSOR
15.00
EVAP BASE EDGE
P/N 3033490
B
B
B
3.08
ROOF TO BOT
EDGE OF EVAP BASE
B
.30
GAP BTW EDGE
OF BASE AND SENSOR
B
(Factory Sengs)