Envision Peripherals Series User Manual

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Geothermal/Water Source Outdoor Split Heat Pumps

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 • 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

Envision

Split Model

Matching Air

Handler

Coil Surface

Area (sq ft.)

FPI Rows

Tube

Diameter

022 - 038

042 - 072

NAH060 5.83 12 3 3/8"

NAH036 5.83 12 2 3/8"

Unit Air Factory

Size Handler

Suction Liquid Suction Liquid Suction Liquid

Charge (oz.)

NDS026 NAH026 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 52

NDS038 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 56

NDS049 NAH048 3/4" OD 3/8" OD 7/8" OD 3/8" OD 7/8" OD 1/2" OD 90

NDS064 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 92

NDS072 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 104

Notes: Lineset charge for R410A is 0.50 oz. per ft. for 3/8" and 1.0 oz. per ft. for 1/2" tube. Rev.: 4/1/08

Initial Total System Charge = Factory Split charge + lineset charge + 20 oz, then adjust charge by subcooling and superheat measurements.

20 feet 40 feet 60 feet

Air Handler Nomenclature

NAH 036 A 00 0 1 R

Model Type Air Coil

NAH = Envision Air Handler R = Refrigerant

H = Hydronic

Unit Capacity

Refrigerant Models Nom. CFM Motor

022 MBTUH 800 1 = ECM 208-230/60/1 026 MBTUH 925 030 MBTUH 980 036 MBTUH 1225 042 MBTUH 1425 Disconnect 048 MBTUH 1625 0 = No breaker installed (only on 5kW & 10 kW heaters ) 060 MBTUH 1760 1 = Breaker installed (only on 15kW & 20kW heaters)

Hydronic Models

026 MBTUH 925 036 MBTUH 1225 Electric Heat 048 MBTUH 1625 00 = No electric heat 060 MBTUH 1760 05 = 5 kW (available on 022-036)

10 = 10 kW (available on 030-060)

Vintage

Note: Kit NAHBC must be ordered to field convert the NAH042-060 to bottomflow air discharge

15 = 15 kW (available on 042-060)

A = Current 20 = 20 kW (available on 060 only)

NS SPLIT INSTALLATION MANUAL

Air Handler Coil Data

Line Set Sizes

NS SPLIT INSTALLATION MANUAL

NAH022 NAH026 NAH030 NAH036 NAH042 NAH048 NAH060

Air Coil Total Face Area, ft2 [m2] Tube outside diameter - in. [mm] Number of rows Fins per inch Suction line connection - in. [mm] sweat Liquid line connection - in. [mm] sweat

Nominal cooling capacity - tons [kW] 1.8 [6.44] 2.1 [7.59] 2.5 [8.79] 3 [10.55] 3.5 [12.30] 4 [14.06] 5 [17.58] Condensate drain connection - (FPT) in. [mm] Blower Wheel Size (Dia x W), in. [mm] Blower motor type/speeds Blower motor output - hp [W] Filter Standard - 1" [51mm] MERV3 disposable, in. [mm] Electrical characteristics (60hz) Shipping weight - lbs. [kg] Operating weight - lbs. [kg]

1/11/08

NAH026 NAH036 NAH048 NAH060

Air Coil Total Face Area, ft2 [m2] Tube outside diameter - in. [mm] Number of rows Fins per inch Water In connection - in. [mm] sweat

Water Out connection - in. [mm] sweat Nominal cooling capacity - tons [kW] 2.1 [7.59] 3 [10.55] 4 [14.06] 5 [17.58] Condensate drain connection - (FPT) in. [mm] Blower Wheel Size (Dia x W), in. [mm] Blower motor type/speeds Blower motor output - hp [W] Filter Standard - 1" [51mm] MERV3 disposable, in. [mm] Electrical characteristics (60hz) Shipping weight - lbs. [kg] Operating weight - lbs. [kg]

3/11/08

220 [99.79]

200 [90.71]

208/230 - 1ph

ECM variable speed

1/2 [373] 1 [746]

20 x 24 [508 x 635]

3/4 [19.05]

11 x 10 [279 x 254]

Air Handler Model Number (Hydronic)

Hydronic

Coil

7/8 [22.22]

6.94 [0.64] 3/8 [9.52]

Air Handler Model Number (Refrigerant)

Evaporator

Coil

5.83 [0.54] 3/8 [9.52]

2 3

5/8 [15.87] 7/8 [22.22]

3/8 [9.52]

Refrigerant R-410a

3/4 [19.05]

11 x 10 [279 x 254]

ECM variable speed

1/2 [373] 1 [746]

20 x 24 [508 x 635]

208/230 - 1ph

215 [97.52] 220 [99.79]

195 [88.45] 200 [90.71]

NOTE: Water connection dimensions are O.D.

Physical Data

NR A C 026 C

Cabinet

Model Type

C = Encased

NR = Envision Refrigerant Coil

U = Uncased

NH = Envision Hydronic Coil

Capacity

Configuration Refrigerant Models

A = "A" Coil 026 MBTUH

036 MBTUH 048 MBTUH

Coil 060 MBTUH

Hydronic Models

060 MBTUH

Note: All Refrigerant Coils include TXV. The encased coil cabinet is designed for upflow applications.

Envision Coil Nomenclature

NS SPLIT INSTALLATION MANUAL

Refrigerant Coil Compatibility

Encased/Uncased Coil

NRAC026* NSZ022 - 800 NRAC026* - NDZ026 NDS026 925

NRAC026* NSZ030 - - 980 NRAC036* NSZ036 - - 1225 NRAC036* - NDZ038 NDS038 1225 NRAC048* NSZ042 - - 1425 NRAC048* NSZ048 - - 1625 NRAC048* - NDZ049 NDS049 1625 NRAC060* NSZ060 - - 1760 NRAC060* - NDZ064 NDS064 1760 NRAC060* NSZ070 - - 1760 NRAC060* - NDZ072 NDS072 1760

Indoor Split Model

(Single)

Indoor Split Model

(Dual Capacity)

Outdoor Split Model

(Dual Capacity)

Recommended

Airow (CFM)

7/14/08

NS SPLIT INSTALLATION MANUAL

Compressor

Heat Recovery

Unit “In”

From

Heat Recovery

Unit “Out” to

Reversing

Valve

Insulated Line set

With UV Paint To Air handler

Add-on

Hot Water

Generator with

Internal Pump

Cold

Drain Valve

Pipe Tee

Hot

Venting

Waste Valve or

Vent Coupling

Line set

To Hot Water

Generator

P/T Relief

Valve

Heat Recovery Unit for Domestic Hot Water

Service valves have been provided inside the unit for connecting the discharge gas line to a water heating heat recov-

ery unit (see gure 5). To make the connections, close the service valves inside the unit by turning clockwise. Using a recovery canister connect to either of the schrader ports on the DSH service valves and recover the small amount of refrig-

erant trapped inside of the U-tube. PriortobrazingensurethatallrefrigeranthasbeenremovedfromU-tube. Once

the refrigerant is removed, it is recommended that the tube be cut at the “U” to remove any excess oil that may be trapped. (This will also allow for easier removal of the tubing with a torch, since each section can be removed independently). Servicevalvesmustbeprotectedtopreventoverheating. Unbraze the 1/2-inch O.D. U-tube and run tubing from the left

hand service valve to the inlet of the heat recovery unit and from the outlet of the heat recovery unit to the right hand of the

service valve. Typically the one way discharge line length should be limited to 25-30 feet and line size must be increased depending on unit size and length of run. Follow the instructions supplied with the heat recovery unit for mounting location, water piping, and start up. A typical installation is shown below.

IMPORTANT-Reopendischargelineservicevalvesbeforestartingupunit,butonlyafterleakchecking, purging,andevacuatingnewdischargeline.

Figure 5: Service Valves for Heat Recovery Unit Connections

Maximum One-Way Line Length

SIZE 1/2”OD 5/8”OD 3/4”OD

026-038 Up to 9 ft. Up to 25 ft. Up to 30 ft.

049 Up to 5 ft. Up to 13 ft. Up to 30 ft.

064 N/A Up to 9 ft. Up to 25 ft.

072 N/A Up to 6 ft. Up to 20 ft.

Figure 6: Typical Hot Water Piping Layout

NS SPLIT INSTALLATION MANUAL

Fused L2

240V L1

240V L2

Microprocessor

Logic Control

(DC Voltage)

Fused L2

CC-GND

CR2

COM

NO NC

CR4

COM

F1-10A 240V

CR1

COM

1234567

123P4123C

Down

1234567

Shut

SL1 In

Not

SL1 Out

Used

NOTE 2

Acc Com

Acc NC

Acc NO

123

1 2 3

NO NC

CR3

COM

F1-10A 240V

487

129103

GWO

SW1

1 2 3 4 5 6 7 8 9

SW3

SW2

2 3 4 5 6 7 8 P ulse L / Constant L

Not Used

Fan / Comp

Loop / Well

Test / Norm

Outputs / Norm

Inputs / Norm

Dual/ Single Capacity

Normal/Finish on 2

No RPM / RPM

Must be On

Envision / E Series or P remier

ECM2

Air Flow

Settings

1 2 3 4 5

Status LED PCB

SW4

RRRRRGY

NOTE 1

SL1 In

SL1 Out

Optional

Remote Unit

Without

Loop Pump

NOT USED

CCHI

Fused L1

Black (7)

Field Selection Dips -#1 On, #6 On, #7 On

Not Used

FP thermistor (loop<15°F,well<30°F) Lockout

High Pressure

Low Pressure / Comfort A lert

Not Used

Microprocessor malfunction*

Not Used

Drain

Water Flow

High Press

Low Press/ CA

Air Flow

Status

DHW Limit

DHW off

LED No rmal Display Mode

#1 Off, #6 On, #7 On

Not Used

FP thermistor (loop<15°F, well<30°F)

High Pressure

Low Pressure / Comfort Alert

Not Used

Current Fault Status

#6 Off, #7 On

Not Used

SL1

SL2

Input s

#6 On, #7 Off

Lo Capacity Compressor

FAN

Not Used

Loop Pump 1

Output s

#6 Off, #7 Off

Not Used

Output s2

Diagnostic Modes

*Green LED not flashing

Hi Capacity Compressor

Loop Pump 2

Not Used

Not UsedNot UsedNot Used

Tan

Orange

Not Used

Yellow

Blue

Black

Comfort Alert

NOTE 5

Comfort

Alert

RYC

Unit Power

208-230/60/1

L2 L1

Comfort Alert

Red B lack

Blue

DC SOL

Run

Capacitor

NOTE 6

Sol

Data

Port

Comfort Alert

Physical Layout

POWER

ALERT

TRIP

Envision Logic Board -Physical Layout

1 2 3

OnOff

SW1

240V - L2

240V - L1

Fused L2

Microprocessor

Premier 2 Logic Board

CR2- Loop

Pump

N.O.

240V - L2

240V - L1

1234567

10111213141516

1234567

1011121314

Fused L2

Fused L1

CR1- DHW

Pump

N.O.

CC-GND

CCLO

CCHI

1 2 3

2345678

101112

OnOff

SW2

2345678

OnOff

SW3

234

1 2 3 4 5 6 7 8

3 4 5

6 71

R C Y1 Y2 GOW L

Shut

Down

ACC

COM

C C

SL1

Out

SL2

Out

N.O.

CR4-

Com

N.O.

CR3-

Com

N.C.

Heat

Recovery

Unit

Pump

Loop Pump(s )

1/2 HP 208-230/60/1

Pump

Thermistor

Light Emitt ing Diode - Green

Relay Coil

Capacitor w/ Bleed Resistor

Switch -High Pressure

Switch - Low Pressure

Polarized Connector

Factory Low voltage wiring

Factory Line voltage wiring

Field low voltage wiring

Field line voltage wiring

Optional block

DC Voltage PCB traces

Internal junction

Quick connect terminal

Wire nut

Field wire lug

Ground

Fuse

CC -

CR1 -

CR2-

CR3 -

CR4 -

F1 and F2 -

FP -

HP -

LP -

RV -

SW1 -

SW2 -

SW3 -

Compressor Contactor

Loop Pump Relay 1

Fuses

Freeze protection sensor

High Pressure Switch

Low Pressure Switch

Reversing Valve Coil

Not Used

DIP Package 8 P osition

DIP Package 5 P osition

Relay Contacts-

N.O., N.C.

Loop Pump Relay 2

Not Used

CS -

Compressor Solenoid

Not Used

Legend

Notes

Yellow (8)

Gray (9)

Violet (10)

Black (1)

Violet (2)

Violet (3)

White (4)

Black (5)

Yellow (6)

Orange (14)

Brown (15)

Tan (16)

Red (11)

Red (12)

Black Black

Green/Yellow

Crankcase Heater

Not Used

1125

CA -

Comfort Alert

Connection of remote unit that does not have a loop pump for slave operation

24V Accessory relay (see SW 2-3 for description of operation)

Field installed DPDT dual fuel relay (Required for dual fuel installation)

DHW pump only in models with hot water generation option

Comfort Alert fault output to Premier Control Board

This switch allows the unit to down stage with the t-stat when OFF and finish on second stage when ON.

Finish second stage reduces stage changing in recip dual capacity compressors and should be ON for

unzoned Dual Cap E-Series or Premier 2 speed units

1 -

2 -

3 -

4 -

5 -

6 -

Wiring Schematics

Envision Series - Dual Capacity Split Wiring Schematic - 208-230/60/1

NS SPLIT INSTALLATION MANUAL

Modes of Operation

Heating Operation

Note: At rst power up, a four-minute time delay is employed before the compressor is energized.

Heat,1stStage(Y1)

The compressor and loop pumps are energized 10 seconds after the Y1 input.

Heat,2ndStage(Y1,Y2)DualCapacityUnits

The second stage compressor will be activated 5 seconds after receiving a “Y2” input as long as the minimum rst stage

compressor run time of 1 minute has expired.

The Comfort Alert will delay the second stage compressor until 5 seconds after it receives “Y2” from the board.

Cooling Operation

In all cooling operations, the reversing valve directly tracks the

reversing valve will be energized.

Cool,1stStage(Y1,O)

The compressor and loop pumps are energized 10 seconds after the Y1 input.

“O”

input. Thus, anytime the

“O”

input is present, the

Cool,2ndStage(Y1,Y2,O)DualCapacityUnits

The second stage compressor will be activated 5 seconds after receiving a “Y2” input as long as the minimum rst stage

compressor run time of 1 minute has expired.

The Comfort Alert will delay the second stage compressor until 5 seconds after it receives a “Y2” from the board.

Fan Only Operation

The Fan Only mode is controlled directly from the unit thermostat to the unit air handler. No input is given to the micro-

processor to operate the fan function.

Lockout Conditions

During lockout mode, the appropriate thermostat lockout LEDs (if available) will illuminate. The compressor and loop

pumps are de-energized and if the thermostat calls for third stage heating, emergency heat operation will occur.

Lockout modes of any kind can be reset at the thermostat after a 5-second waiting period, which restores normal

operation.

High Pressure

This lockout mode occurs immediately when the normally closed safety switch is momentarily opened.

Low Pressure

This lockout mode occurs when the normally closed switch is opened for 30 continuous seconds.

Freeze Sensing (Water Flow)

This lockout mode occurs when the freeze sensing thermistor temperature (located between the TXV and coax) is at or

below the selected freeze sensing point (well 30°F or loop 15°F) for 30 continuous seconds.

The unit also contains a secondary freeze sensing sensor located on the entering water line of the unit. If the loop reaches a temperature of 20°F the secondary freeze sensing sensor will cycle the loop pumps "on" until the loop temperature rises to or above 25°F.

Operation Logic Data

NS SPLIT INSTALLATION MANUAL

OPERATIONLOGIC

DUALCAPACITYUNITS

Compressor-Lo

Compressor-Hi

RevValve

Loop Pumps

Secondary1-Out

Secondary2-Out

EmergLED

T-StatSignal

HE AT ING COOLING

STG1 STG2 STG3 EMERG STG1 STG2

On Off Off Off On Off -

Off On On Off Off On -

Off Off Off Off On On -

On On On Off On On On

On On On Off On On -

Off On On Off Off On -

Off Off Off On Off Off -

Y1 Y1, Y2 Y1, Y2, W W Y1, O Y1, Y2, O -

SL1-INON

NS SPLIT INSTALLATION MANUAL

DIP Switch Settings

DIPSWITCH

NUMBER

SW1 N/A NOTUSED N/A N/A

Service/TestMode-Allows control of “NORM” or “TEST” opera-

tional modes. Test mode accelerates most timing functions 16

times to allow faster troubleshooting. Test mode also allows viewing the “CURRENT” status of the fault inputs on the LED display.

FreezeSensingSetting

Allows eld selection of freeze thermistor fault sensing tempera-

tures for well water (30°F) or antifreeze-protected (15°F) earth

loops.

AccessoryRelay

Allows eld selection of the accessory relay to operate with the

compressor or fan.

SW2

4 NOT USED N/A N/A

5 NOT USED N/A N/A

InputDiagnostics-Allows viewing the inputs from the thermo-

stat to the control board such as Y1, Y2, O, G, W, SL1-In on the LED display.

DESCRIPTION OFFPOSITION ONPOSITION

Test Norm

Loop

(Sensing 15° F)

Fan Comp

Diagnostic Inputs

viewed at LEDs

Well

(Sensing 30° F)

Normal Display viewed at LEDs

SW3

OutputDiagnostics-Allows viewing the outputs from the control

board such as the compressor, reversing valve, blower, hot water pump, and loop pump on the LED display.

ThermostatSelection

Congures the control for a pulsed lockout signal (ComforTalk and FaultFlash thermostats) or continuous 5 VAC lockout signal.

1 Single or Dual Capacity Operation Dual Cap 1 Speed

Zoned/FinishonSecondStage

This switch allows the unit to down stage with the thermostat

when off and nish with second stage when on. Finish on second

stage reduces stage changing in reciprocating dual capacity compressors.

3 ECM Fan Monitoring - Set for No PRM on split systems No RPM RPM

4 NOT USED N/A N/A

On dual capacity units this switch allows stage change: on the y

when off, and 1 minute delay when on. A delay is required on all

reciprocating dual capacity units.

Diagnostic

Outputs viewed at

LEDs

Pulsed “L”

signal

Normal -

All other systems

Envision

Normal

Display viewed

at LEDs

Continuous “L”

signal

Finish on 2nd

Unzoned Dual

Capacity

E-Series or

Premier 2 speed

E-Series or

Premier

NS SPLIT INSTALLATION MANUAL

Replace caps after opening system

Service ports for

attaching refrigerant

gauges

Insulated

Suction Line

Braze

Connection

Liquid

Line

ccw

Refrigeration

The Envision series comes with a holding charge. The charge must be adjusted in the eld based on performance. Refrigeration piping on the split consists of installing a brazed copper line set between the blower coil unit and the unit’s split compressor section. To select the proper tube diameters for the installation, refer to the table on page 9. Line sets over 60 feet long are not recommended because of oil return and pressure drop problems. The suction line must always be insulated. Handle and route the line sets carefully to avoid kinking or bending the tubes. If the line set is kinked or distorted and it cannot be formed back into its original shape, the bad portion of the pipe should be replaced. A restricted line set will affect

the performance of the system.

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. 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 insulation should be painted with UV resistant paint or covering to

insure long insulation life.

Fasten the copper line set to the blower coil unit as instructed by the coil installation instructions. Nitrogen should be bled through the system at 2 to 3 PSI to prevent oxidation inside the refrigerant tubing. Use a low silver phos-copper braze alloy

on all brazed connections.

Braze line set to the service valve stubs on the inside front of the split cabinet as shown in Figure 7. Nitrogen should be bled through the system at 2 to 3 PSI to prevent oxidation contamination. Use a low

silver phos-copper braze alloy on all brazed connec-

tions. Envision split units are shipped with a factory

charge and service valves are not to be opened

until the line set has been leak tested, purged and

evacuated. Schrader cores should be removed

before brazing. A heat sink should be used on the

service valves and TXV to prevent damage caused

by excessive heat.

Figure 7: Typical Split System Refrigerant Line Connections

NS SPLIT INSTALLATION MANUAL

Refrigeration (continued)

Leak Testing

The refrigeration line set must be pressurized and checked for leaks before purging and charging the unit. To pressurize the line set, attach refrigerant gauges to the service ports and add an inert gas (nitrogen or dry carbon dioxide) until pressure reaches 60 to 90 PSIG. Never use oxygen or acetylene to pressure test. Use an electronic leak detector or a good quality bubble solution to detect leaks on all connections made in the eld. Check the service valve ports and stem for leaks and all connections made in the eld. If a leak is found, repair it and repeat the above steps. For safety reasons do not pressurize the system above 150 psi. Purge pressure from line set. The system is now ready for evacuating and charging.

System Evacuation

Ensure that the line set and air coil are evacuated before opening service valves to the split unit. The line set must be evacuated to at least 200 microns to remove the moisture and air that may still be in the line set and coil. Evacuate the system through both service ports to prevent false readings on the gauge because of pressure drop through service ports.

Initial System Charge Calculation

The Envision unit comes with a factory pre-charge. This volume is not sufcient to run the system. Additional refrigerant

must be added for the lineset. This additional charge added to the factory pre-charge of the Envision unit should be esti-

mated using the following equation:

Addition to Factory Charge = (lineset length x oz. per ft) + (20 oz. for accumulator)

The lineset charge should be calculated by multiplying the length times 0.5 oz./ft for 3/8” liquid line and 1.0 oz/ft for 1/2” liquid line in R-410A systems. The suction line will not hold ‘liquid’ and can be ignored for the calculation. This should result in a slightly under-charged unit exhibiting low subcooling and high superheat. As charge is added, the subcooling should rise and the superheat should fall until 8-16 degrees of superheat is reached when the TXV should be metering the system. See operating details in the startup section of this manual for exact superheat and subcooling values.

Example: 038 with 40 foot of 3/8” liquid line.

Additional to be added = (40 ft x 0.5 oz./ft) + (20 oz. for accumulator)

= 40 oz.

Solution: 40 oz. should be added to the existing 56 oz. of factory charge as an initial charge.

Charging the System

Charge Method – After purging and evacuating the line set, fully open the service valves counterclockwise. Add R-410A (liquid) into the liquid line service port until the pressure in the system reaches approximately 200 PSIG. Never add liquid

refrigerant into the suction side of a compressor. Start the unit and measure superheat and subcooling. Keep adding refrig-

erant until the unit meets the superheat and subcooling values on page 21.

Checking Superheat and Subcooling

Determining Superheat

Measure the temperature of the suction line at the point where the expansion valve bulb is clamped.

Determine the suction pressure in the suction line by attaching refrigeration gauges to the schrader connection on the

suction side of the compressor.

Convert the pressure obtained in Step 2 to the saturation temperature by using the R-410A Pressure/Temperature Con-

version Chart on page 20. Subtract the temperature obtained in Step 3 from Step 1. The difference is the amount of superheat for the unit. Refer to

tables on page 21 for superheat ranges at specic entering water conditions.

Superheat Adjustment

TXV’s are factory set to a specic superheat; however, the superheat should be adjusted for the application. To adjust the TXV to other superheat settings:

Remove the seal cap from the bottom of the valve.

Turn the adjustment screw clockwise to increase superheat and counterclockwise to decrease superheat. One complete

360° turn changes the superheat approximately 3-4°F, regardless of refrigerant type. You may need to allow as much as 30 minutes after the adjustment is made for the system to stabilize.

NS SPLIT INSTALLATION MANUAL

Refrigeration (continued)

Once the proper superheat setting has been achieved, replace and tighten the seal cap.

Warning: There are 8 total (360°) turns on the superheat adjustment stem from wide open to fully closed. When adjusting the superheat stem clockwise (superheat increase) and the stop is reached, any further clockwise turning adjustment will

damage the valve.

Determining Subcooling

Measure the temperature of the liquid line on the small refrigerant line (liquid line) just outside the split cabinet. This

1. location will be adequate for measurement in both modes unless a signicant temperature drop in the liquid line is anticipated. Measure the liquid line pressure by attaching refrigerant gauges to the schrader connection on the liquid line service

valve.

3. Convert the pressure obtained in Step 2 to the saturation temperature by using the R-410A Pressure/Temperature

Conversion Chart on page 20.

4. Subtract the temperature in Step 1 from the temperature in Step 3. The difference will be the subcooling value for

that unit. Refer to the tables on page 21 for subcooling ranges at specic enter water conditions.

NS SPLIT INSTALLATION MANUAL

Pressure/Temperature Coversion Chart for R-410A

PRESSURE

(PSIG)

TEMP °FPRESSURE

(PSIG)

TEMP

°F

PRESSURE

(PSIG)

TEMP °FPRESSURE

(PSIG)

TEMP

°F

PRESSURE

(PSIG)

60 8.5 180 63.5 300 96.3 420 120.6 540 140.0 62 9.9 182 64.2 302 96.8 422 120.9 542 140.3

64 11.2 184 64.8 304 97.2 424 121.3 544 140.6 66 12.5 186 65.5 306 97.7 426 121.6 546 140.9 68 13.8 188 66.1 308 98.1 428 122.0 548 141.2

70 15.1 190 66.8 310 98.6 430 122.3 550 141.4 72 16.3 192 67.4 312 99.0 432 122.7 552 141.7 74 17.5 194 68.0 314 99.5 434 123.0 554 142.0 76 18.7 196 68.7 316 99.9 436 123.4 556 142.3 78 19.8 198 69.3 318 100.4 438 123.7 558 142.6 80 21.0 200 69.9 320 100.8 440 124.1 560 142.9 82 22.1 202 70.5 322 101.2 442 124.4 562 143.2

84 23.2 204 71.1 324 101.7 444 124.8 564 143.5 86 24.3 206 71.7 326 102.1 446 125.1 566 143.7 88 25.4 208 72.3 328 102.5 448 125.4 568 144.0 90 26.5 210 72.9 330 103.0 450 125.8 570 144.3 92 27.5 212 73.5 332 103.4 452 126.1 572 144.6 94 28.6 214 74.1 334 103.8 454 126.5 574 144.9 96 29.6 216 74.7 336 104.2 456 126.8 576 145.1

98 30.6 218 75.3 338 104.7 458 127.1 578 145.4 100 31.6 220 75.8 340 105.1 460 127.5 580 145.7 102 32.6 222 76.4 342 105.5 462 127.8 582 146.0 104 33.5 224 77.0 344 105.9 464 128.1 584 146.2 106 34.5 226 77.5 346 106.3 466 128.5 586 146.5 108 35.4 228 78.1 348 106.7 468 128.8 588 146.8

110 36.4 230 78.7 350 107.2 470 129.1 590 147.1

112 37.3 232 79.2 352 107.6 472 129.4 592 147.3

114 38.2 234 79.8 354 108.0 474 129.8 594 147.6 116 39.1 236 80.3 356 108.4 476 130.1 596 147.9 118 40.0 238 80.9 358 108.8 478 130.4 598 148.2

120 40.9 240 81.4 360 109.2 480 130.7 600 148.4 122 41.7 242 81.9 362 109.6 482 131.1 602 148.7 124 42.6 244 82.5 364 110.0 484 131.4 604 149.0 126 43.4 246 83.0 366 110.4 486 131.7 606 149.2 128 44.3 248 83.5 368 110.8 488 132.0

608 149.5

130 45.1 250 84.1 370 111 .2 490 132.3 132 45.9 252 84.6 372 111 .6 492 132.7 134 46.7 254 85.1

374 112.0 494 133.0 136 47.5 256 85.6 376 112.3 496 133.3 138 48.3 258 86.1 378 112.7 498 133.6 140 49.1 260 86.6 380 113.1 500 133.9 142 49.9 262 87.1 382 113.5 502 134.2

144 50.7 264 87.7 384 113.9 504 134.5 146 51.5 266 88.2 386 114.3 506 134.9 148 52.2 268 88.7 388 114.7 508 135.2 150 53.0 270 89.2 390 115.0 510 135.5 152 53.7 272 89.6 392 115.4 512 135.8 154 54.5 274 90.1 394 115.8 514 136.1 156 55.2 276 90.6 396 116.2 516 136.4 158 55.9 278 91.1 398 116.5 518 136.7 160 56.6 280 91.6 400 116.9 520 137.0

162 57.4 282 92.1 402 117.3 522 137.3

164 58.1 284 92.6 404 117.6 524 137.6 166 58.8 286 93.0 406 118.0 526 137.9 168 59.5 288 93.5 408 118.4 528 138.2

170 60.2 290 94.0 410 118.7 530 138.5 172 60.8 292 94.5 412 119.1 532 138.8 174 61.5 294 94.9 414 119.5 534 139.1 176 62.2 296 95.4 416 119.8 536 139.4 178 62.9 298 95.8 418 120.2 538 139.7

TEMP

°F

Unit Operating Parameters

Note: Cooling performance based on entering air temperatures of 80º F DB, 67º F WB. Heating performance based on entering air temperature of 70º F DB.

First Stage Operation

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Superheat Subcooling

Water Temp

Rise °F

Air Temp

Drop °F DB

1.5 125-140 205-225 9-15 3-10 17-21 17-23

3.0 120-135 190-210 9-15 3-10 8-12 17-23

1.5 135-145 260-290 9-18 5-11 16-20 17-23

3.0 126-143 230-250 9-18 5-11 9-13 17-23

1.5 138-150 315-345 8-14 7-14 14-20 17-23

3.0 136-148 300-330 8-14 7-14 8-12 17-23

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Superheat Subcooling

Water Temp

Drop °F

Air Temp

Rise °F DB

1.5 76-89 260-325 7-12 4-16 5-9 12-16

3.0 80-93 265-330 7-12 4-16 3-7 14-18

1.5 105-120 295-355 7-14 4-16 7-11 18-22

3.0 110-125 300-360 7-14 4-16 5-9 20-24

1.5 135-155 330-385 9-14 7-15 8-12 24-28

3.0 140-160 335-390 9-14 7-15 6-10 22-30

Second Stage Operation

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Superheat Subcooling

Water Temp

Rise °F

Air Temp

Drop °F DB

1.5 120-135 215-235 10-16 3-11 17-21 17-23

3.0 115-130 200-220 10-16 3-11 8-12 17-23

1.5 121-136 270-305 9-15 5-12 16-20 17-23

3.0 118-133 255-285 9-15 5-12 9-13 17-23

1.5 126-143 325-360 8-14 7-15 14-20 17-23

3.0 123-140 310-340 8-14 7-15 8-12 17-23

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Superheat Subcooling

Water Temp

Drop °F

Air Temp

Rise °F DB

1.5 72-81 280-330 6-12 10-20 5-9 12-16

3.0 76-85 285-335 6-12 10-20 3-7 14-18

1.5 100-115 305-370 6-12 6-18 7-11 18-22

3.0 105-120 310-375 6-12 6-18 5-9 20-24

1.5 133-147 340-400 7-14 4-15 8-12 24-28

3.0 138-152 345-405 7-14 4-15 6-10 22-30

Heating -- No Desuperheater

Entering Water

Temp °F

Water Flow

GPM/Ton

Entering Water

Temp °F

Water Flow

GPM/Ton

Cooling -- No Desuperheater

Entering Water

Temp °F

Water Flow

GPM/Ton

Cooling -- No Desuperheater

Entering Water

Temp °F

Water Flow

GPM/Ton

Heating -- No Desuperheater

Dual Capacity Models

NS SPLIT INSTALLATION MANUAL

30°F 50°F 70°F 90°F 110°F

4 1.4 1.3 1.2 1.1 1.0

6 2.8 2.6 2.4 2.3 2.1

8 4.7 4.4 4.1 3.8 3.5

10 7.0 6.6 6.2 5.8 5.3

3 0.8 0.7 0.7 0.7 0.6

5 2.0 1.8 1.7 1.6 1.5

7 3.6 3.4 3.2 3.0 2.8

9 5.8 5.5 5.1 4.8 4.4

5 1.2 1.2 1.1 1.0 1.0

7 2.2 2.1 1.9 1.8 1.7

9 3.4 3.2 3.0 2.8 2.6

11 4.9 4.6 4.3 4 3.7

4 0.9 0.8 0.8 0.7 0.7

6 1.7 1.6 1.5 1.4 1.3

8 2.8 2.6 2.5 2.3 2.1

10 4.2 3.9 3.7 3.4 3.2

6 1.2 1.2 1.1 1.0 1.0

9 2.4 2.2 2.1 2.0 1.8

12 3.9 3.6 3.4 3.2 2.9

15 5.7 5.3 5 4.7 4.3

5 0.9 0.9 0.8 0.8 0.7

8 2.0 1.8 1.7 1.6 1.5

11 3.4 3.1 2.9 2.8 2.5

14 5.0 4.7 4.4 4.1 3.8

8 1.8 1.7 1.6 1.4 1.3

12 3.8 3.5 3.3 3.0 2.8

16 6.5 6.0 5.6 5.2 4.8

20 9.7 9.1 8.5 8.0 7.4

6 1.0 0.9 0.9 0.8 0.8

10 2.6 2.5 2.3 2.1 2.0

14 5.0 4.7 4.4 4.1 3.8

18 8.1 7.6 7.1 6.6 6.1

12 3.2 3.0 2.8 2.6 2.4

15 4.5 4.2 4.0 3.7 3.4

18 6.0 5.7 5.3 4.9 4.6

21 7.8 7.3 6.8 6.4 5.9

10 2.3 2.1 2.0 1.9 1.7

13 3.6 3.3 3.0 2.8 2.6

16 5.0 4.6 4.3 4.0 3.7

19 6.5 6.2 5.8 5.4 5.0

5/30/06

038

full

load

049

part

load

064

full

load

072

part

load

064

part

load

072

full

load

Pressure Drop (psi)

Model GPM

026

part

load

038

part

load

049

full

load

026

full

load

Pressure Drop and Recommended Flow Rates

Dual Capacity

NS SPLIT INSTALLATION MANUAL

Unit Startup

Before Powering Unit, Check The Following:

High voltage is correct and matches nameplate.

•

Fuses, breakers and wire size correct.

•

Low voltage wiring complete.

•

Piping completed and water system cleaned and ushed.

•

Air is purged from closed loop system.

•

Isolation valves are open, water control valves or loop pumps wired.

•

Transformer switched to 208V if applicable.

•

DIP switches are set correctly.

•

DHW pump switch is “OFF” unless piping is completed and air has been purged.

•

Blower rotates freely.

•

Blower speed correct.

•

Air lter/cleaner is clean and in position.

•

Service/access panels are in place.

•

Return air temperature is between 50-80ºF heating and 60-95ºF cooling.

•

Check air coil cleanliness to insure optimum performance. Clean as needed according to maintenance guidelines.

•

To obtain maximum performance the air coil should be cleaned before startup. A 10-percent solution of dishwasher detergent and water is recommended for both sides of coil, a thorough water rinse should follow.

Startup Steps

Notes: Complete the Equipment Start-Up/Commissioning Check Sheet during this procedure. Refer to thermostat operat- ing instructions and complete the startup procedure.

1. Initiate a control signal to energize the blower motor. Check blower operation.

2. Initiate a control signal to place the unit in the cooling mode. Cooling setpoint must be set below room temperature.

3. First stage cooling will energize after a time delay.

4. Be sure that the compressor and water control valve or loop pump(s) are activated.

5. Verify that the water ow rate is correct by measuring the pressure drop through the heat exchanger using the P/T plugs and comparing to unit capacity data in specication catalog.

6. Check the temperature of both the supply and discharge water (see page 21).

7. Check for an air temperature drop of 15°F to 25°F across the air coil, depending on the fan speed and entering water

temperature.

8. Decrease the cooling set point several degrees and verify high-speed blower operation.

9. Adjust the cooling setpoint above the room temperature and verify that the compressor and water valve or loop pumps

deactivate.

10. Initiate a control signal to place the unit in the heating mode. Heating set point must be set above room temperature.

11. First stage heating will energize after a time delay.

12. Check the temperature of both the supply and discharge water (see page 21).

13. Check for an air temperature rise of 20°F to 35°F across the air coil, depending on the fan speed and entering water

temperature.

14. If auxiliary electric heaters are installed, increase the heating setpoint until the electric heat banks are sequenced on. All stages of the auxiliary heater should be sequenced on when the thermostat is in the Emergency Heat mode. Check amperage of each element.

15. Adjust the heating setpoint below room temperature and verify that the compressor and water valve or loop pumps

deactivate.

NS SPLIT INSTALLATION MANUAL

Unit Startup (cont.)

16. During all testing, check for excessive vibration, noise or water leaks. Correct or repair as required.

17. Set system to desired normal operating mode and set temperature to maintain desired comfort level.

18. Instruct the owner/operator in the proper operation of the thermostat and system maintenance.

Notes: Be certain to ll out and forward all warranty registration papers.

Final Evaluation

After the initial check of superheat/subcooling values in the heating mode, shut off the unit and allow it to sit 3 to 5 minutes until pressures equalize. Restart the unit in the cooling mode and check the values against those in tables on page 21. If the unit performs satisfactorily, charging is complete. If the unit does not perform to specications, the charge may need to be readjusted until the values are close. Adding refrigerant will increase subcooling. Recovering some of the refrigerant will decrease subcooling and increase superheat. If the superheat/subcooling values are still not close to the specications in tables on page 21, analyze refrigerant circuit operation.

Heating Cycle Analysis

COOLING TXV - ACTIVE RIGHT TO LEFT

ClgTXV

Lineset

length

Measure liquid line temperature and pressure here in both heating and cooling modes

COAX

HEATING TXV - ACTIVE LEFT TO RIGHT

HtgTXV

Measure suction temperature here at TXV bulb in heating modes.

Suct PSI____

Suct sat temp____

Volts ____

Amps ____

EWT ____

LWT ____

Suct temp____

Super heat____

Discharge PSI____

Disch. sat temp____

Liquid temp____

Sub cooling____

Bi-flow

filter/drier

Air

Coil

Suction

Discharge

Comp

Desuperheater

Measure suction temperature here at TXV bulb in cooling modes.

Cooling Cycle Analysis

COOLING TXV - ACTIVE RIGHT TO LEFT

ClgTXV

Measure liquid line temperature and pressure here in both heating and cooling modes

COAX

HEATING TXV-ACTIVE LEFT TO RIGHT

HtgTXV

Measure suction temperature here at TXV bulb in heating modes.

Suct PSI ____

Suct sat temp ____

Volts ____

Amps ____

EWT ____ LWT ____

Suct temp ____

Super heat ____

Discharge PSI ____

Disch. sat temp ____

Liquid temp ____

Sub cooling ____

Bi-flow

filter/drier

Air

Coil

Suction

Discharge

Comp

Desuperheater

Measure suction temperature here at TXV bulb in cooling modes.

Note: DO NOT hook up pressure gauges unless there appears to be a performance problem.

Lineset

length

Unit Startup/Troubleshooting

NS SPLIT INSTALLATION MANUAL

Troubleshooting

Standard Microprocessor Controls

To check the unit control board for proper operation:

1. Disconnect thermostat wires at the control board.

2. Jumper the desired test input (Y1, Y2, W, O or G) to the R terminal to simulate a thermostat signal.

3. If control functions properly:

• Check for thermostat and ﬁeld control wiring (use the diagnostic inputs mode).

4. If control responds improperly:

• Ensure that component being controlled is functioning (compressor, blower, reversing valve, etc.).

• Ensure that wiring from control to the component is functioning (refer to the LED Deﬁnition table below and use the diagnostic outputs mode).

• If steps above check properly, replace unit control.

LED Deﬁnitions and Diagnostics

Standard Microprocessor

DIAGNOSTIC MODES

INPUTS OUTPUTS 1 OUTPUTS 2

1 NA

6 Off

7 Off

Compressor

(On or Low)

Blower

Low

LED

Drain

NORMAL

DISPLAY MODE

Field Selection DIPS

SW2- 1 On SW2- 1 Off SW2- 1 NA SW2- 1 NA SW2-

SW2- 6 On SW2- 6 On SW2- 6 Off SW2- 6 On SW2-

SW2- 7 On SW2- 7 On SW2- 7 On SW2- 7 Off SW2-

Drain Pan Overﬂow

Lockout

CURRENT

FAULT STATUS

Drain Pan Overﬂow Y1

Water Flow

High

Pressure

FP Thermistor (Loop

<15º F, Well<30ºF)

Lockout

High Pressure >600

PSI Lockout

FP Thermistor (Loop

<15º F, Well<30ºF)

High Pressure >600 O Reversing Valve

Compressor (On or High)

Blower

Medium

Blower

High

Low

Pressure,

Current

Low Pressure <40 Low Pressure/CA <40 G Fan Aux Heat 1

Sensor

Status

DHW Limit

DHW Off

Microprocessor

Malfunction

HWL Thermistor

>130ºF

DHW Pump

Switch Off

Not Used SL1 Loop Pump 1 Aux Heat 3

HWL Thermistor

>130°F

DHW Pump Switch Off – – –

Not Used Loop Pump 2 Aux Heat 4

Refrigerant Systems

To maintain sealed circuit integrity, do not install service gauges unless unit operation appears abnormal. Compare the change in temperature on the air side as well as the water side to the tables on pages 21. If the unit’s performance is not within the ranges listed, and the airﬂow and water ﬂow are known to be correct, gauges should then be installed and superheat and subcooling numbers calculated. If superheat and subcooling are outside recommended ranges, an adjustment to the refrigerant charge may be necessary.

Notes:

Refrigerant tests must be made with desuperheater turned “OFF”.

proper levels before servicing the refrigerant circuit.

Verify that air and water ﬂow rates are at

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 inltrate 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 overow.

Blower Motors

Blower motors on most air handlers are equipped with sealed ball bearings and require no periodic oiling.

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.

CAUTION:Finedgesaresharp.

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.

NS SPLIT INSTALLATION MANUAL

Top View

Suction Line

Connection

Connection Point for Field Installed

Heat Recovery Unit

Liquid Line Connection

Lineset connections are braze type internally mounted

Front View

Side View

WATER IN

WATER OUT

Rear View

Side View

Physical Dimensions

Cabinet Dimensions and Refrigerant Piping Connections

MODEL A B C D E F G H I J K L M

PHYSICALDIMENSIONS

36.0 23.9 25.7 9.3 7.1 9.0 5.6 8.2 10.7 18.9 8.7 14.8 7.0

NS026thruNS072

Notes: Refer to Physical Dimensions and Piping Connections drawings

Inches [cm]

[91.4] [60.7] [65.2] [23.7] [18.0] [22.8] [14.2] [20.9] [27.2] [48.0] [22.1] [37.6] [17.8]

IM1615 10/08

Manufactured by

WaterFurnace International, Inc.

9000 Conservation Way

Fort Wayne, IN 46809

WaterFurnace International, Inc., 9000 Conservation Way, Fort Wayne, IN 46809-9794. WaterFurnace has a policy of continual product research and development and reserves the right to change

Product: EnvisionSeries-NSOutdoorSplit

Type: Geothermal/Water Source Heat Pumps

Size: 2-6 Tons

Document: Installation Manual

Envision Peripherals Series User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual