Removing a Shell from the Tub
Shell Removal
Servicing plumbing:
Troubleshooting: When it is suspected that a tub has a leak a “Leak Down Test” should be performed to locate the level of the leak.Leak Down test: Turn power off and allow 24 hours for the water to leak down. Mark on the shell with a grease pencil where to waterline is. Allow another 24 hours for leaking and mark the waterline. Continue this process until the waterline no longer drops.
This may take several days in the case of a very small leak.
This will indicate the level of the leak. At this point check all fittings at that level to ensure that they are tight. If the spa still leaks after checking for any loose filling or fixtures, then the shell must be removed from the cabinet for a more complete plumbing inspection.
NOTE: A special note should be taken here, that in most cases leaks are caused by fittings with gaskets inside the equipment area, so be very sure to check and re-check the pump unions, filter nut, heater unions and hose bib connector, as well as the light and suction intake fittings. Other possible leaks in the equipment room would be the temp sensor, pump seal, and ozonator hose.
Shell Removal: This following should be done by a spa service technician
When servicing Nordic Round tubs access to the plumbing is most easily accomplished by removing the shell (plastic interior liner) from the cabinet (exterior wood or plastic enclosure).
On rare occasions it may be necessary to remove a Nordic shell from its cabinet, for plumbing inspection or shell replacement in the case of shell damage.
The following procedure should take approximately 20 minutes, and should be done by two people.
Shell Removal:
- With the power off and the spa drained.
- Disconnect the suction side union on the pump and the left heater union.
- If applicable disconnect the ozonator air-line and unplug it from the control box
- Unplug the topside control from the control box,
- In tubs prior to 2008 disconnect the temperature sensor from the control box.
- Disconnect the light harness from the control box.
- Remove the 2 screws holding the pump down and the 2 screws holding the pack
- Remove the equipment from the spa
- Remove the 8 screws around the lip of the shell.
To help with lining the tub back up when re-installing it is a good idea to mark the shell and cabinet with masking tape.
For shell replacements, you will want to do the same but use a landmark like the center of the air controls.
Using two people, lift the shell and associated plumbing and foam out of the cabinet.
NOTE: A Nordic hot tub can be filled and run outside of the cabinet, for pressure leak detection.
Reassemble shell and cabinet in the reverse order.
