Nortec MH Series - Manual (Page 71)

Maintenance and Servicing | 68
Maintenance Shutdown and Extended Shutdown
The following procedure should be followed to shut down the MHTC/B for maintenance or
should a period of extended shut-down be required.
1 Close the shut-off valve in the water supply line.
2 MHTC Reflow – Empty the hydraulic unit reservoir by starting the manual drain.
3 Wait for the reservoir to be empty.
4 Turn the power switch on the control box to “Off”.
5 Shut off the electrical power at the disconnect and secure the system against accidentally
being reconnected to the mains.
6 If work has to be done on the MH then switch off the air handling system and secure the
system against accidentally being switched on.
7 The unit can now be serviced (if maintenance is being performed), or “stored” in this state
until the next season.
8 To restart the unit follow Start Up Procedure on page 38. If the unit has been left off for a
long period of time then disconnect the supply water line before the unit and flush for at
least 3 minutes. Then reconnect the line.
Note:
If an MHTC unit has to be switched off because of a malfunction, please note the code of
the actual error before shutting the unit off.
Note:
 As long as the MHTC/MHB is powered, it will automatically flush the supply lines to
prevent water in the lines from becoming stagnant. This feature will reduce or prevent
the possible accumulation of algae and bacteria growing in supply lines.
 Dust and dirt can accumulate in the media even when it is not operating. If the MH is to
be left off for a long period of time it may be advantageous to remove media and store
in a safe dry place. Dust and dirt can accumulate in the media even when it is not
operating.