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724-746-5500 | blackbox.com
Chapter 5: Maintenance
Symptom: Water–water/glycol valve fails to open or close.
Probable Causes/Recommendations:
a. Temperature setpoint too high. Adjust to correct temperature setting.
b. No control power to the valve. Valve actuator is wired incorrectly. Check wiring diagram and rewire if required.
c. Actuator failed. Replace actuator.
Symptom: Condenser pressure too high (CRDX-A-FS-12KW, CRDX-A-FS-24KW units).
Probable Causes/Recommendations:
a. Non-condensable gas or air in the system. Recover system, evacuate per Section 2.10.2.2, recharge. Replace drier/strainer.
b. Condenser air intake is blocked. Remove debris and clean condenser.
c. Overcharge of refrigerant. Reclaim excess refrigerant from system.
d. Condenser fan not operating. Check pressure/temperature operating switches and motor. Replace as needed.
Symptom: Condenser pressure too high (CRDX-W-FS-12KW, CRDX-W-FS-24KW, CRDX-G-FS-12KW, CRDX-G-FS-24KW units).
Probable Causes/Recommendations:
a. Flow of water/glycol too low.
1. Check glycol solution level and concentration.
2. Valves not open or partially open. Repair/replace as needed.
3. Air in system—bleed system.
4. Check all strainers and clean if needed.
b. Water/glycol temperature too high. Check flow and operation of drycooler.
c. Control pressure set too high. Adjust controller to obtain correct pressure.
d. Water/glycol solution not mixed prior to adding to system. Remove solution and premix. Refill system.
Symptom: Condenser pressure too low.
Probable Causes/Recommendations:
a. Loss of refrigerant (indicated by bubbles in sight glass). Locate and repair leak. Recharge system.
b. Condenser fan controls not set properly. Adjust or repair controls.
c. Control pressure set too low. R410A—Readjust to 440 psig.