Pioneer Air Systems ADR Series, Owner'S Manual

10

TROUBLESHOOTING

PROBLEM REMEDY 

1. System bypass open. 

Close bypass valve and open inlet/outlet valves 

2. Excessive air flow. 

Check rated output capacity of air compressor; a larger system 
may be needed. 

3. High inlet air temperature. 

A larger system or after-cooler may be needed (consult factory) 

4. Dirty heat exchanger. 

Disconnect dryer inlet/outlet and flush with steam cleaner and 
copper solvent. 

5. Drain malfunction. 

Clean or replace. 

6. Not draining all moisture. 

Adjust on/off times to drain – longer and/or more frequently. 

7. Refrigerant compressor cycling 
due to high refrigerant pressure or 
overload 

a. Overloaded unit. 

b. Dirty atmosphere. 

c.  High ambient temperature. 

d.  Condenser fan motor failure. 

e. Incorrect high-pressure 

shutdown setting. 

f. Bad compressor. 

 
 
 
Reduce load or install larger system. 

Clean condenser and install filter. Relocate unit or convert to 
water-cooled unit. 
Provide suitable ventilation or relocate unit. Consult factory. 

Repair or replace. 

Correct to: R-134a: 235 PSIG/16.2 BarG 
                  R-22:     350 PSIG/2724.1 BarG  

Replace compressor and liquid and suction line filters. 

8. Refrigerant compressor cycling on 
low pressure 

a. Refrigerant low. 

b.  Incorrect low pressure control 

setting. 

c. Low-pressure control 

malfunction. 

 
 
Inspect for leaks, repair, evacuate and recharge. Consult factory. 

Correct to: 
R-134a: cut out 20 PSIG/1.38 BarG, cut in 30 PSIG/2.07 BarG 
R-22:    cut out 40 PSIG/2.16 BarG, cut in 60 PSIG/4.14 BarG 
Units supplied with pump down: 
R-22:    cut out 25 PSIG/1.73 BarG, cut in 35 PSIG/2.42 BarG 

Replace. 

9. Refrigerant suction temperature 
too low/freeze up. 

a.  Check fan cycle switch (if 

supplied). 

b.  Ambient temperature too low. 

Correct settings: 
#1 Fan 
R-134a: cut out 75 PSIG/5.2 BarG, cut in 125 PSIG/8.6 BarG 
R-22   : cut out 150 PSIG/10.4 BarG, cut in 230 PSIG/15.9 BarG 

#2 Fan 
R-134a: cut out 110 PSIG/7.6 BarG, cut in 160 PSIG/11.4 BarG 
R-22   : cut out 200 PSIG/13.8 BarG, cut in 275 PSIG/19 BarG 
Relocate unit to a heated room/install low ambient package. 
Consult factory.