Quantum 340-17ACW-134 User Manual

Document number: QDC0030PD-11                                                                                                                                                                              Page 33 of 40 

 

 

 

 

1.  Tank water drawn off - unit only 

recently started.

 

Wait until water is heated.

 

If water is not heated in the expected time, 
check for other reasons.

 

2.    Low or no refrigerant.

 

Check for shortage of refrigerant or leakage in the system.

 

Refer to Table A.2: Item 1

 

3.    Compressor is not pumping.

 

a.    Check for internal valve leak. When shut off, gas will go 

back through the compressor making noise and vibration. 

b.    Minimum pressure difference across compressor due to TX 

valve malfunction. Test TX valve.

 

a.    Replace compressor if faulty. 
 
b.  Adjust or Replace TX valve. 

4.  Frozen evaporator.

 

a.    Malfunction of de-ice system or persistent cold weather 

resulting in poor performance of the fin coil evaporator. 

b.  Blocked evaporator. 
c.  Restricted airflow.

 

a.  Repair or replace de-ice system or avoid 

running in constant cold weather. 

b.  Repair blockage or replace parts. 
c.  Clean or replace air filter (if fitted), or 

provide ventilation. 

 

 

 

 

1.  System under sized. 

Check actual load with design load. 

Re-size. 

2. 

Unexpected load or weather 
condition. 

a.    Check for excessive hot water draw. 
 
b.    Check for not water leakage. 
c.    Check heat loss if the heater is on reticulation circuit. 
 

a.  Re-size if extra hot water draw is to be 

included in the design. 

b.  Repair leakage if found. 
c.    Re-size with heat loss included in the 

design or install booster. 

3.    System not producing enough heat.  Check according to Table A.3: item 2, 3 & 4. 

See Table A.3: items 2, 3 & 4.