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NS SPLIT INSTALLATION MANUAL
Preventive Maintenance
Water Coil Maintenance
1. Keep all air out of the water. An open loop system should be checked to ensure that the well head is not allowing air to
inltrate the water line. Lines should always be airtight.
2. Keep the system under pressure at all times. It is recommended in open loop systems that the water control valve be
placed in the discharge line to prevent loss of pressure during off cycles. Closed loop systems must have positive static
pressure.
Notes: On open loop systems, if the installation is in an area with a known high mineral content (125 PPM or greater) in
the water, it is best to establish with the owner a periodic maintenance schedule so the coil can be checked regularly.
Should periodic coil cleaning be necessary, use standard coil cleaning procedures which are compatible with either the
cupronickel or copper water lines. Generally, the more water owing through the unit the less chance for scaling.
Other Maintenance
Filters
Filters must be clean to obtain maximum performance. They should be inspected monthly under normal operating con-
ditions and be replaced when necessary. Units should never be operated without a lter.
Condensate Drain
In areas where airborne bacteria produce a slime in the drain pan, it may be necessary to treat chemically to minimize
the problem. The condensate drain can pick up lint and dirt, especially with dirty lters. Inspect twice a year to avoid the
possibility of overow.
Blower Motors
Blower motors on most air handlers are equipped with sealed ball bearings and require no periodic oiling.
Desuperheater Coil
See Water Coil Maintenance section above.
Air Coil
The air coil must be cleaned to obtain maximum performance. Check once a year under normal operating conditions
and, if dirty, brush or vacuum clean. Care must be taken not to damage the aluminum ns while cleaning.
Replacement Procedures
Obtaining Parts
When ordering service or replacement parts, refer to the model number and serial number of the unit as stamped on
the serial plate attached to the unit. If replacement parts are required, mention the date of installation of the unit and the
date of failure, along with an explanation of the malfunctions and a description of the replacement parts required.
In-Warranty Material Return
Material may not be returned except by permission of authorized warranty personnel. Contact your local distributor for
warranty return authorization and assistance.
CAUTION: Fin edges are sharp.