Envision Peripherals Series User Manual

Geothermal/Water Source Outdoor Split Heat Pumps

™

 • R-410ARefrigerant  • 2,3,4,5,6TonDualCapacity

Installation Information

Water Piping Connections

Electrical

Startup Procedures

Troubleshooting

Preventive Maintenance

Envision Series Outdoor Split Installation Manual

IM1615 10/08

WaterFurnace

NS SPLIT INSTALLATION MANUAL

Table of Contents

Nomenclature 2

PhysicalCharacteristics 2

GeneralInstallationInformation 3-6

ElectricalData 7

WaterPiping 8

AirHandlerNomenclature&CoilData 9

LineSetSizing 9

PhysicalData 10

EnvisionCoilNomenclature 11

RefrigerantCoilCompatability 11

HeatRecoveryUnit 12

WiringSchematics 13

ModesofOperation 14

OperationLogic 15

DIPSwitchSettings 16

Refrigeration 17-19

Pressure/TemperatureConversionChart 20

UnitOperatingParameters 21

PressureDropandRecommendedFlowRates 22

UnitStartup&Troubleshooting 23-26

PreventiveMaintenance 27

ReplacementProcedures 27

PhysicalDimensions 28

NS SPLIT INSTALLATION MANUAL

1 2 3 4-6 7 8 9 10 11

N D S 049 A 1 0 A C

Model Type

N = Envision Coax Options

C = Copper Compressor Type N = Cupronickel D = Dual Capacity

Future Option Cabinet Configuration A =

S = Outdoor Split

Hot Water Option Unit Capacity 0 = None

Vintage Voltage

A = Current 1 = 208-230/60/1

Model 026 038 049 064 72

Compressor (1 each)

Factory Charge R410a, oz [kg]

[1.47]

[1.59]

[2.55]

[2.61]

104

[2.95]

Coax and Water Piping

Coax & Piping Water Volume - gal [l]

0.7

[2.6]

1.3

[4.9]

1.6

[6.1]

1.6

[6.1]

2.3

[8.7]

Weight - Operating, lb [kg]

189

[186]

236

[107]

250

[113]

271

[123]

290

[132]

Weight - Packaged, lb [kg]

209 [95]

256

[116]

270

[122]

291

[132]

310

[141]

4/9/08

Notes:

All units have TXV expansion devices, and 1/2" [12.2mm] & 3/4" [19.1mm] electrical knockouts.

Dual Capacity Scroll

Model Nomenclature

Physical Characteristics

NS SPLIT INSTALLATION MANUAL

General Installation Information

Safety Considerations

WARNING:Beforeperformingserviceormaintenanceoperationsonasystem,turnoffmainpower

switchestobothunits.Turnoffaccessoryheaterpowerswitchifapplicable.Electricalshock couldcausepersonalinjury.Installingandservicingheatingandairconditioningequipmentcan behazardousduetosystempressureandelectricalcomponents.Onlytrainedandqualiedservicepersonnelshouldinstall,repairorserviceheatingandairconditioningequipment.

Installing and servicing heating and air conditioning equipment can be hazardous due to system pressure and electri-

cal components. Only trained and qualied service personnel should install, repair or service heating and air conditioning

equipment. Untrained personnel can perform the basic maintenance functions of cleaning coils and cleaning and replacing

lters. All other operations should be performed by trained service personnel. When working on heating and air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply, such as the following safety measures:

Follow all safety codes.• Wear safety glasses and work gloves.• Use a quenching cloth for brazing operations.• Have a re extinguisher available for all brazing operations.•

Moving and Storage

Move units in the normal “up” orientation. Units may be moved and stored per the information on the packaging. Do not stack more than three units in total height. Do not attempt to move units while stacked. When the equipment is received, all items should be carefully checked against the bill of lading to be sure all crates and cartons have been received. Examine units for shipping damage, removing the units from the packaging if necessary. Units in question should also be internally inspected. If any damage is noted, the carrier should make the proper notation on the delivery receipt, acknowledging the

damage.

Split Unit Location

Locate the split compressor section away from areas that may disturb the customer and in a way that allows easy re-

moval of the access panels and the top of the cabinet. Provide sufcient room to make water, electrical and refrigerant line connections and allow space for service personnel to perform maintenance. The NS split is approved for outdoor installation when properly installed.

Air Coil Location

Refer to the air handler manufacturer’s instructions for the blower coil unit for details on installing the air handling portion

of the system.

Condensate Drain

Follow the blower coil manufacturer’s instructions.

Duct System

All blower coil units/air coils must be installed as specied by the manufacturer’s installation instructions; however, the following recommendations should considered to minimize noise and service problems. An air lter must always be installed upstream of the air coil on the return air side of the air handler or furnace. If there is limited access to the lter rack for normal maintenance, it is suggested that a return air lter grill be installed. Be sure that the return duct is properly installed and free of leaks to prevent dirt and debris from bypassing the lter and plugging the air

coil.

In applications using galvanized metal ductwork, a exible duct connector is recommended on both the supply and return air plenums to minimize vibration from the blower. To maximize sound attenuation of the unit blower, the supply and return plenums should include an internal duct liner of 1-inch thick glass ber or be constructed of ductboard. Insulation is usually not installed in the supply branch ducts. Ducts in unconditioned areas should be wrapped with a minimum of 1-inch duct insulation. Application of the unit to uninsulated ductwork in an unconditioned space is not recommended as the unit’s performance will be adversely affected. If the air handler is connected to existing ductwork, a previous check should have

NS SPLIT INSTALLATION MANUAL

General Installation Information (cont.)

been made to assure that the duct system has the capacity to handle the air required for the unit application. If ducting

is too small, as in replacement of heating only systems, larger ductwork should be installed. All existing ductwork should be checked for leaks and repairs made accordingly. The duct systems and diffusers should be sized to handle the design airow quietly. If air noise or excessive airow is a problem, the blower speed can be changed to a lower speed to reduce airow. This will reduce the performance of the unit slightly in heating; however, it will increase the temperature rise across the air coil. Airow must still meet minimum requirements.

Equipment Selection

The following guidelines should be used when mating an Envision Split to an air handler/coil.

Select R-410A components only.• Match the air handler to the air handler coil data table.•

Indoor matching adjustable TXV is factory installed on every air handler/coil. Fixed orice or cap tube systems •

should not be used.

Utilizing Existing Coil or Air Handler

It is recommended that a new R-410A air handler be installed with an Envision Split considering the long term benets of reliability, warranty, etc. versus the short term installation cost savings. However, the existing air handler may be retained provided the following:

Coil currently is R-410A rated• Coil uses a TXV. No capillary or xed orice systems should be used• A life expectancy of more than 7 years remaining for the air handler and components•

NS SPLIT INSTALLATION MANUAL

Lineset

To A ir Handler

Insulated

Suction Line

Return

Duct

Low

Voltage Wire

Disconnect

Remote Air Handler

(Maximum Recommended Distance is

60' Between Units)

Condensate Drain (must be trapped)

Supply

Duct

Air

Handler

General Installation Information (cont.)

Connection to Air Coil

Figures 1 and 2 illustrate typical Envision Split installations. The table on page 9 shows typical lineset diameters and maximum length. Linesets over 60 feet are not recommended. If the lineset is kinked or deformed and cannot be reformed, the bad section of pipe should be replaced. A restricted lineset will affect unit performance. As in all R-410A equipment, a reversible liquid line lter drier is required to insure all moisture is removed from the system. This drier should be replaced whenever “breaking into” the system for service. All linesets should be insulated with a minimum of 1/2” closed cell insulation. All exterior insulation should be painted with UV resistant paint or covering to insure long insulation life.

Air Handler Installation

Air handlers used with dual capacity units must be capable of operating with a minimum of 2 blower speeds. Refer to the manufacturer’s instructions for the blower coil unit for details on installing the air handling portion of the system. All blower coil units/air coils must be installed as specied by the manufacturer’s installations instructions. However, the following rec-

ommendations should be considered to minimize noise and service problems.

An air lter must always be installed upstream of the air coil on the return air side of the air handler of furnace. If there is limited access to the lter rack for normal maintenance, it is suggested that a return air lter grille be installed. Be sure that the return duct is properly installed and free of leaks to prevent dirt and debris from bypassing the lter and plugging the air

coil.

Ensure that the line set size is appropriate to the capacity of the unit (refer to page 9). Line sets should be routed as di-

rectly as possible, avoiding unnecessary bends or turns. All wall penetrations should be sealed properly. Line set should not come into direct contact with water pipes, oor joists, wall studs, duct work, oors, walls and brick. Line set should not be suspended from joists or studs with a rigid wire or strap which comes into direct contact with the tubing. Wide hanger strips which conform to the shape of the tubing are recommended. Isolate hanger straps from line set insulation by using metal sleeves bent to conform to the shape of insulation. Line set insulation should be pliable, and should completely surround the

refrigerant line.

Notes: Improper installation of equipment may result in undesirable noise levels in the living areas.

Figure 1: Typical Split System Application - Remote Blower Coil

NS SPLIT INSTALLATION MANUAL

Thermostat

Wire From Furnace

Wire To

Thermostat

Up-Flow

Fossil Fuel

Furnace

Condensate

Drain

(must be trapped)

"A" or

Slab Coil

Supply Duct

Insulated

Suction Line

Return

Duct

Lineset To Air Handler

Disconnect

General Installation Information (cont.)

Dual Fuel Systems

Envision units can be connected to fossil fuel furnaces that include an A-coil or slab coil. Dual fuel installations utilize the Envision heat pump for heating until the point that auxiliary heat is called for on the thermostat. At that point, the furnace will be enabled and the heat pump will be disabled. The Envision heat pump provides air conditioning through the furnace’s

refrigerant coils.

Refer to the furnace manufacturer’s installation manual for the furnace installation, wiring and coil insertion. A WaterFurnace Dual Fuel thermostat, a eld-installed DPST relay or dual capacity auxiliary heat relay is required. See Figure 2 for typical Dual Fuel application.

In add-on Envision Split applications, the coil should be located in the supply side of the furnace to avoid condensation damage to the furnace heat exchanger. A high temperature limit should be installed upstream of the coil to de-energize the compressor whenever the furnace is operating. Without this switch, the Envision Split will trip out on high pressure. A dual fuel thermostat can remove the Y1 and Y2 calls when a W call is energized to allow gas furnace backup on an Envision Split application. Refer to thermostat wiring on page 13 for details.

Figure 2: Typical Split System Heat Pump Coil Add-On Fossil Fuel Furnace

NS SPLIT INSTALLATION MANUAL

Rated Voltage

HWA Ext Total Min Max

Model Voltage Min/Max

Pump Loop Unit Circ Fuse/

MCC RLA LRA FLA FLA FLA Amp HACR

026 208-230/60/1 197/253 16.0 10.2 52.0 0.4 5.4 16.0 18.6 25 038 208-230/60/1 197/253 26.0 16.6 82.0 0.4 5.4 22.4 26.6 40 049 208-230/60/1 197/253 33.0 21.1 96.0 0.4 5.4 26.9 32.2 50 064 208-230/60/1 197/253 40.0 25.6 118.0 0.4 5.4 31.4 37.8 60 072 208-230/60/1 197/253 42.5 27.2 150.0 0.4 5.4 33.0 39.8 60

Rated Voltage of 208-230/60/1.

Rev.: 02/20/07

HACR circuit breaker in USA only.

Min/Max Voltage of 197/253.

All fuses Class RK-5.

Compressor

Air Handler

Thermostat

24 VAC

Common Common

24 VAC

Reversing Valve

2nd Stage Compressor

1st Stage Compressor

Fan

Ty pical EZ Wiring Diagram

Air Handler transformer must be at least 75 VA.

Fault Signal

Envision Split

Fossil Fuel

Furnace

Thermostat

24 VAC

Common Common

24 VAC

Fault Signal

Reversing Valve

2nd Stage Compressor

1st Stage Compressor

Fan

Auxiliary Heat Relay

Note: Field installed DPST dual fuel relay

(Required for dual fuel installation)

Auxiliary Heat Relay

Shut

Down

= chassis

Envision Split

Auxiliary

Heat Relay

Electrical

General

Be sure the available power is the same voltage and phase as that shown on the unit serial plate. Line and low voltage wiring must be done in accordance with local codes or the National Electric Code, whichever is applicable. See unit electrical data for fuse or cicuit breaker sizing information.

Electrical Data

Thermostat Wiring

Figure 3a: Thermostat Wiring

Figure 3b: Thermostat Wiring for Dual Fuel Applications

NS SPLIT INSTALLATION MANUAL

Loop Supply and Return Piping

Water Piping

Residential NS split units are supplied standard with GeoLink swivel connections with P.T. ports.

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

Water Piping

The proper water ow must be provided to each unit whenever the unit operates. To assure proper ow, use pressure/ temperature ports to determine the ow rate. These ports should be located at the supply and return water connections on the unit. The proper ow rate cannot be accurately set without measuring the water pressure drop through the refrigerantto-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 4. Make the connections to optional ttings from the loop circulator pump(s) and insure proper backll 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

pumpiflooptemperaturedropsbelow20°F.Loopfreezesensingshouldalsobemaintainedtothe lowesttemperaturetheinsulatedloopmayencounterinthecaseofpowerfailure.

- Afreezesensingthermostatisinstalledintheunittoautomaticallystartloopcirculator

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 ttings, to adapt to the ow center, 2 hoses to connect between the two sets of tubes, and four hose clamps are included with each NDS unit. The brass adapter ttings have plastic swivel connectors and are also internally threaded to accept 1” NPT ttings.

NOTE: For ease of installation, attach provided hoses to

coax rst and then trim to t to elbows on ow center.

Figure 4: Typical Split System Outdoor Installation Using Closed Loop

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