WaterFurnace Envision Hydronic (NDW) - Manual (Page 33)

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NDW INSTALLATION MANUAL
Unit Heat Exchanger Maintenance
1. Keep all air out of the water or antifreeze solution.
2. Keep the system under pressure at all times. Closed loop systems must have positive static pressure or air vents may
draw air into the system.
NOTES: If the installation is in an area with a known high mineral content in the water, it is best to establish with the
owner a periodic maintenance schedule for checking the water-to-refrigerant heat exchanger on a regular basis. Should
periodic cleaning be necessary, use standard cleaning procedures. Generally, the more water flowing through the unit, the
less chance there is for scaling. Low GPM flow rates produce higher temperatures through the heat exchanger. To avoid
excessive pressure drop and the possibility of metal erosion, do not exceed GPM flow rate as shown on the specification
sheets for each unit.
Replacement Procedures
When contacting the company for 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.
Preventive Maintenance