Kysor/Warren 6RLG3, Installation & Operation Manual

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TROUBLESHOOTING
Defrost
A quick check of adequate defrost can be made by checking the air movement across the cases.
Smoke should move gently from the discharge air honeycomb to the return air grill, but an
iced-up coil will be immediately apparent by little or no air current leaving the honeycomb.
Case Icing
If operation of the case seems normal but the case seems to ice up every three to four weeks, the
drain connection to the case and cleanliness of the drain should be checked. Improper drainage
(as a result of improper drain treatment) will show itself as icing every few weeks or so.
Though it is not likely, should icing of the coil or drain pan ever occur, the coil and pan must be
thoroughly and completely defrosted before proper operation may be expected.
Unit Will Not Cool
If the case will not cool perform the following:
1. Verify no heating or air conditioning vents are interfering with the thermostatic controls or
affecting the case temperature. If OK, proceed to step 2. If not OK, follow recommended
installation instructions contained in the Installation chapter of this manual.
2. Verify case discharge or return air grills are not blocked or otherwise obstructed. If OK,
proceed to step 3. If not OK, remove obstruction(s) and verify the proper operation of the
case. Refer to the Operation chapter of this manual.
3. Verify coils are clean. If OK, proceed to step 4. If not OK, remove obstruction(s) and
verify the proper operation of the case. Refer to the Operation chapter of this manual.
4. Verify temperature control is adjusted to proper setting. OK? Proceed to step 5. If not OK,
troubleshoot the temperature controls, including the thermostat, expansion valve, and
expansion valve as applicable.
5. Check fans for proper operation. OK? Proceed to step 6. If not OK, troubleshoot fans and
check for proper voltage to the fans. Remove and replace fans as necessary. Refer to the
Removal chapter of this manual. Verify case temperature is lowered and for proper
operation. Refer to the Operation chapter of this manual.
6. Check refrigerant level to case. OK? Contact your Kysor//Warren Service Representative.
If not OK, go to step 7.
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