Nautel NX300, Operation And Maintenance Manual

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NX300 Operations and Maintenance Manual Routine maintenance
Page 3-2 Issue 3.0 2012-11-01
Checking hardware
All hardware must be checked at least once a year. Thermal cycling from turning the NX300 on and
off will require more frequent checks.
• To prevent damaging the hardware, ensure that the proper sized tools are used. In most
cases, hardware is metric.
• A mounting surface or terminal that has changed colour indicates a loose hardware connec-
tion.
• Multi-stranded cables installed on terminal strips must be retorqued.
Battery replacement
The NX300's control/interface PWB contains a battery backup circuit that provides a memory of
alarm occurrences during ac power failure. See
“Replacing the control/interface PWB battery” on
page 3-4 .
Replacing a damaged air filter
If an air filter becomes damaged, replace it as follows:
Interval
As required.
Parts and tools
Replacement air filter and filter coat spray.
Procedure
Take the following steps to replace an NX300 air filter:
1. Order a new filter and filter coat spray, as necessary. You can order a standard sized filter
from Nautel (Nautel Part # HR111) or from the manufacturer (Research Products, EZ
Kleen filter # 9151) or obtain one from any local supplier of HVAC supplies.
2. Order new filter coat spray, if necessary. You can order replacement filter coat from Nautel
(Nautel Part # HQ59) or from the manufacturer (Research Products Handi-Koter adhesive
spray bottle # 412) or obtain it from any local supplier of HVAC supplies.