Operation - Gardner Denver 9VXRD Series Instruction Manual

2.0 OPERATION

2.1 Minimum/maximum operating conditions
A. Maximum inlet air pressure: refer to unit serial
number tag
B. Minimum inlet air pressure: 20 psig (1.4 kgf/cm
C. Maximum inlet air temperature: 120°F (49°C)
D. Maximum ambient temperature:
Air-cooled models: 110°F (43°C)
Water-cooled models: 130°F (54°C)
E. Minimum ambient temperature: 35°F (2°C)
2.2 Start-up
IMPORTANT: Energize dryer disconnect switch 24
hours before refrigeration compressor is started!
Never use the disconnect switch to shut-down the
dryer for a extended period of time (except for
repair). Failure to follow these instructions may result
in a non-warrantable compressor failure.
NOTE: Start unit before introducing air flow. High
pressure switch has a manual reset. If refrigerant pressure
cut-out (compressor off light) illuminates during start-up,
reset switch.
A. Control Panel
1. After making sure that on/off switch is off ("O" ),
energize dryer. Green power-on light will glow.
2. On water-cooled units - after 24 hours start flow
of water through condenser.
3. After 24 hours, energize compressor by positioning
-
the on/off switch in the on ("I") position. Green
compressor-on light will glow.
NOTE: COMPRESSOR ROTATION - Model 800 thru 2300
only - ensuring proper compressor rotation - Dryer contains
a scroll compressor which must rotate in the proper
direction. If after starting dryer an unusual noise is heard
and the suction pressure fails to drop into the normal range,
stop dryer, reverse two power leads, restart, and verify that
suction pressure is reading as stated on serial no. tag.
B. Alarms
1. High temperature alarm - If the Lowest Air Tempera-
ture exceeds the alarm set point, the red high
temperature warning light will glow.
2. Refrigerant pressure cut out alarm - If the high or low
refrigerant pressure set points have been exceeded,
the dryer will shut down. The green compressor-on
light will turn off and the red refrigerant pressure cut
out light will glow.
NOTE: High refrigerant pressure switch has a manual
reset. After correcting fault, manually reset switch to
resume operation.
C. Drain Test Button (models with electric drains)
Standard Control Panel: Push test button on drain valve
to manually activate. Drain energized light will glow.
Digital Control Panel: Push test button on digital board.
6
2.3 Operating check points – Check the following on
a periodic basis:
A. Power-on light glows indicating power to the dryer.
B. Compressor-on light (green) glows indicating the
refrigerator compressor is operating.
2 )
C. Standard Panels
1. High air temperature warning light is out. The high air
temperature warning light will illuminate when unit is
energized. Light should go out approximately 15
minutes after start-up. If light remains lit after 30
minutes or lights again after going out, refer to
Troubleshooting Guide.
2. Refrigerant pressure cut out light is out.
D. Digital panels - Check for alarms - compressor on light -
red indicating compressor off because of refrigerant
pressure cut out. High temperature alarm. High level
alarm (optional).
E. Suction pressure gauge indicates proper low side
refrigerant pressure. (Refer to engineering data)
F. Outlet pressure gauge - Compare with pressure at inlet
to dryer to determine if a higher than normal pressure
drop exists.
G. Inlet temperature gauge (supplied on models with
Standard Control Board) - inlet temperature should read
below 120°F (49°C).
H. Condensate is discharging from drain
2.4 Using the Digital Panel
A. Function Lights
1. Power-on light - indicates power to dryer
2. Compressor-on light - indicates power to
control circuit, refrigeration compressor should
be running
3. Drain energized light - indicates power to solenoid
valve, drain should be open
B. Numeric Display - When the on/off switch is placed in
the ON position, the Numeric Display indicates Lowest Air
Temperature. Additional temperatures, alarm setpoints,
and electric drain adjustment are available by pressing
the mode selector button in the following sequence:
1. Display indicates Outlet Air Temperature. Outlet
temperature light glows.
2. Display indicates Ambient Temperature. Ambient
temperature light glows.
3. Display indicates Inlet Temperature Alarm set point.
Green light glows in Temperature Alarm box. Set point
may be changed by pushing up and down arrows.
4. Display indicates Lowest Air Temperature Alarm set
point. Green light glows in Temperature Alarm box. Set
point may be changed by pushing up and down arrows.
5. Used on models with Electric Drains (if dryer is not
equipped with electric drain sequence through this
step) Display indicates Electric Drain Closed time in
minutes and tenths of a minute. Green light in drain
time box glows. Time between valve openings may be
changed by pushing up and down arrows.
6. Display indicates inlet air temperature. Inlet
temperature light glows.