Gardner Denver EBB BB-7.5 HP, Руководство по эксплуатации и обслуживанию

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13–8–612 Page 65
SYMPTOM POSSIBLE CAUSE REMEDY
High suction pressure 1. Excessive air load exceeding 1. Verify proper flow and load at dryer
(62 to 72 psig normal) the capacity of the dryer. inlet.
2. Hot gas by–pass valve setting 2. Follow instructions in manual
too high. checking and setting hot gas by–
pass valve.
3. High ambient condition. 3. Verify ambient conditions as
specified in the manual.
Low suction pressure 1. Low or no air load. 1. Verify proper flow and load at dryer
(62 to 72 psig normal) inlet.
2. Fan not cycling at low load. 2. Check fan operation. Verify proper
operation of fan cycling control.
3. Hot gas by–pass valve setting 3. Follow instructions in manual for
too low. checking and setting hot gas
by–pass valve.
4. Refrigerant leak. 4. Check unit for leaks using soap
bubbles or electronic leak
detector. Repair leak.
5. Low ambient temperature 5. Check fan operation. Verify proper
and fan not cycling. operation of fan cycling control.
Moisture in air system 1. Dryer overloaded (air flow). 1. Verify proper flow and load at dryer
downstream. inlet.
2. Separator drains not functioning. 2. Inspect automatic drain and verify
proper operation. Follow instruc–
tions in maintenance manual.
3. By–pass valve open. 3. Close by–pass.
4. Refrigeration system not 4. See “Dryer not running, Motor light
operating. is on” and “Dryer not running,
Motor light is off,” page 64.
High pressure drop in 1. Dryer overloaded (air flow). 1. Verify proper flow and load at dryer
dryer air circuit. inlet.
2. Heat exchanger clogged. 2. Clean exchanger to remove debris
and restart unit.
3. Frozen evaporator coil. 3. Verify proper load and hot gas by–
pass valve settings. Follow instruc–
tions in manual to check and set
hot gas by–pass valve.