Envision Peripherals Series Water Piping, Closed Loop Earth coupled Systems Outdoor Installations

NS SPLIT INSTALLATION MANUAL

Water Piping

Residential NS split units are supplied standard with brass water connections which will connect to flow center.

CAUTION: Never use flexible hoses smaller than 1-inch inside diameter on the unit and limit hose length to 10 feet per connection. Check carefully for water leaks.

CAUTION: Water piping exposed to outside temperatures may be subject to freezing.

Water Piping

The proper water flow must be provided to each unit whenever the unit operates. To assure proper flow, use pressure/ temperature ports to determine the flow rate. These ports should be located at the supply and return water connections on the unit. The proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerant-to- water heat exchanger.

Closed Loop - Earth coupled Systems (Outdoor Installations)

Locate unit on an air pad with access hole as shown below. When mounting on an existing concrete pad, holes must be bored through to accommodate 1 1/4-inch P.E. pipe with 1/2-inch insulation.

Connecting To Earth Loop

The earth loop trench should be continued directly under the unit as shown in Figure 3. Make the connections to op- tional fittings from the loop circulator pump(s) and insure proper backfill to support the loop pipe during trench settling. All 1 1/4-inch piping should be insulated with a minimum of 1/2-inch closed cell insulation from below the ground surface to the loop circulator.

IMPORTANT - A freeze protection thermostat is installed in the unit to automatically start loop circulator pump if loop temperature drops below 20°F. Loop freeze protection should also be maintained to the lowest temperature the insulated loop may encounter in the case of power failure.

Flow Center Installation

Flow centers FC1-GL or FC2-GL, as needed, may be internally mounted on the NDS splits, Two stub tubes with barbs are pre connected to the coax. Two tubes with brass fittings, to adapt to the flow center, 2 hoses to connect between the two sets of tubes, and four hose clamps are in- cluded with each NDS unit. The brass adapter fittings have plastic swivel connectors and are also internally threaded to accept 1” NPT fittings.

NOTE: For ease of installation, attach provided hoses to coax first and then trim to fit to elbows on flow center.

Figure 3: Typical Split System Outdoor Installation Using Closed Loop

Loop Supply

and Return

Piping