Envision Peripherals Geothermal Indoor Split Heat Pumps User Manual

Envision Series Geothermal Indoor Split Heat Pumps

• R-410A Refrigerant

• 2 - 6 Ton Single Speed

• 2 - 6 Ton Dual Capacity

Installation Information

Water Piping Connections

Desuperheater Connections

Electrical

Startup Procedures

Troubleshooting

Preventive Maintenance

Envision Split Installation Manual

IM1592 06/07

ENVISION SERIES INSTALLATION MANUAL

N D Z 049 A 1 1 A C

Coax Options

Model Type C= Copper

N= Envision N= Cupronickel

Compressor Type Open Option

D= Dual Capacity A= Standard S= Single Speed

Hot Water Option

Cabinet Configuration 0= None

Z= Indoor Split 1= Hot Water Gerneration with

factory installed pump

Unit Capacity

Voltage

Vintage 1= 208-230/60/1

A= Current

Model 022 030 036 042 048 060 070 026 038 049 064 072

Compressor (1 each)

Factory Charge R410a, oz [kg]

[1.59]56[1.59]56[1.59]74[2.1]90[2.55]92[2.61]

108

[3.06]52[1.47]56[1.59]90[2.55]92[2.61]

104

[2.95]

Coax and Water Piping

Water Connections Size - Swivel- in [mm]

1 [25.4]

HWG Connection Size - Swivel - in [mm]

1 [25.4]

Coax & Piping Water Volume - gal [l]

0.7

[2.6]

1.0

[3.8]

1.3

[4.9]

1.3

[4.9]

1.6

[6.1]

1.6

[6.1]

2.3

[8.7]

0.7

[2.6]

1.3

[4.9]

1.6

[6.1]

1.6

[6.1]

2.3

[8.7]

Weight - Operating, lb [kg]

164 [74]

174 [79]

212 [96]

213 [97]

246

[112]

251

[114]

292

[132]

189

[186]

236

[107]

250

[113]

271

[123]

290

[132]

Weight - Packaged, lb [kg]

184 [83]

194 [88]

232

[105]

233

[106]

266

[121]

271

[123]

312

[142]

209 [95]

256

[116]

270

[122]

291

[132]

310

[141]

Notes:

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

Rev.:6/7/07

1 [25.4]

Single Speed Scroll Dual Capacity Scroll

1 [25.4]

Model Nomenclature

Physical Characteristics

ENVISION SERIES INSTALLATION MANUAL

Table of Contents

Model Nomenclature 2

Physical Characteristics 2

General Installation Information 4-8

Air Handler Coil Data 9

Line Set Sizes 9

Open Loop Well Water Systems 10-11

Closed Loop Ground Source Systems 12

Desuperheater 13-14

Electical Data 14

Thermostat Wiring 15

Wiring Schematics 16-17

Microprocessor Control Features and Operation 18-19

Operation Logic Data 20

DIP Switch Settings 21

Refrigeration 22-25

Unit Operating Parameters 26-27

Unit Startup 28-30

Pressure Drop & Recommended Flow Rates 31

Troubleshooting 32

Preventive Maintenance 33

Replacement Procedures 33

Physical Dimensions 34

ENVISION SERIES INSTALLATION MANUAL

General Installation Information

Safety Considerations

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

to the indoor unit. If applicable, turn off the accessory heater power switch. Electrical shock could cause

personal injury.

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.

Unit Location

Locate the unit in an indoor area that allows for easy removal of the access panels. Location should have enough space for service personnel to perform maintenance or repair. Provide sufcient room to make water, electrical and refrigerant line connections. Any access panel screws that would be difcult to remove after the unit is installed should be removed prior to setting the unit. Care should be taken when units are located in unconditioned spaces to prevent damage from frozen water lines and excessive heat that could damage electrical components.

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

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

ENVISION SERIES INSTALLATION MANUAL

General Installation Information (continued)

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.

• Select 12 SEER or higher air handler/coil.

• Match the air handler to the air handler coil data table on page 9.

•

Indoor matching adjustable TXV should be used with any 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

•

ENVISION SERIES INSTALLATION MANUAL

Disconnect

Thermostat Wire From Air Handler

Vibration Absorbing Pad or Air Pad

P/T Plugs

Water Out

Water In

Lineset To Air Handler

Insulated Suction Line

Supply

Duct

Wire To

Thermostat

Return

Duct

Condensate Drain

(must be trapped)

To Drain

Remote Air Handler

(Maximum Recommended Distance is

50' Between Units)

DHW In

DHW Out

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 with Remote Blower Coil

ENVISION SERIES INSTALLATION MANUAL

Disconnect

Thermostat

Wire From Furnace

Vibration Absorbing Pad or Air Pad

P/T Plugs

Wire To

Thermostat

Up-Flow

Fossil Fuel

Furnace

Condensate

Drain

(must be trapped)

"A" or

Slab Coil

Supply Duct

Air Temperature Limit Switch to prevent compressor operation when entering air is greater than 90°F.

Water Out

Water In

Lineset To Air Handler

Insulated

Suction Line

DHW In

Return

Duct

DHW Out

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 15 for details.

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

ENVISION SERIES INSTALLATION MANUAL

Locking Ring

Stainless Steel Snap Ring

Gasket Support Sleeve

Gasket Material

Water Piping

The proper water ow must be provided to each unit whenever the unit

Figure 3: Swivel Connections (Residential Units)

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 refrigerant-to-water heat exchanger. All source water connections on residential units are swivel piping ttings (see Figure 3) that accept 1-inch male pipe threads (MPT) . The swivel connector has a rubber gasket seal similar to a rubber hose gasket, which when mated to the ush end of any 1-inch threaded pipe provides a leak-free seal without the need for thread sealing tape or compound. Check to ensure that the rubber seal is in the swivel connector prior to attempting any connection. The rubber seals are shipped attached to the waterline. To make the connection to a ground loop system, mate the brass connector (supplied in CK4L connector kit) against the rubber gasket in the swivel connector and thread the female locking ring onto the pipe threads, while maintaining the brass connector in the desired direction. Tighten the connectors by hand, then gently snug the tting with pliers to provide a leak-proof joint. When connecting to an open loop (ground water) system, thread the 1-inch MPT tting (SCH80 PVC or copper) into the swivel connector and tighten in the same manner as

noted above. The open and closed loop piping system should include pressure/temperature taps for serviceability.

Never use exible hoses smaller than 1-inch inside diameter on the unit. Limit hose length to 10 feet per connection. Check carefully for water leaks.

Air Handler Coil Data

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.)

NZ022 NAH036 5/8" OD 3/8" OD 5/8" OD 3/8" OD 3/4" OD 3/8" OD 56

NZ030 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 3/8" OD 56

NZ036 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 56

NZ042 NAH060 3/4" OD 3/8" OD 3/4" OD 3/8" OD 7/8" OD 1/2" OD 74

NZ048 NAH060 3/4" OD 3/8" OD 7/8" OD 3/8" OD 7/8" OD 1/2" OD 90

NZ060 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 92

NZ070 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 108

NZ026 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 52

NZ038 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 56

NZ049 NAH060 3/4" OD 3/8" OD 7/8" OD 3/8" OD 7/8" OD 1/2" OD 90

NZ064 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 92

NZ072 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.: 6/8/07

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

20 feet 40 feet 60 feet

Notes: * Variable speed air handler required for all dual capacity units.

Line Set Sizes

ENVISION SERIES INSTALLATION MANUAL

Disconnect

Thermostat Wire From Air Handler

Vibration Absorbing Pad or Air Pad

P/T Plugs

Boiler Drains for

System Flushing

Water Solenoid

Control Valve

Rubber Bladder Pressure Tank

Lineset To Air Handler

Flow

Regulator

Shut-Off Valves

Water Out Water In From W ell

Acc Com

Acc NC

Acc NO

Solenoid

Valve

CC-GND

CCHI

Comfort

Alert

Logic Board

Violet(3)

Blk(1)

Wht(4)

VM valve

Violet(2)

Open Loop - Well Water Systems

Typical open loop piping is shown below. Always maintain water pressure in the heat exchanger by placing water control valves at the outlet of the unit to prevent mineral precipitation. Use a closed bladder type expansion tank to minimize mineral formation due to air exposure. Ensure proper water ow through the unit by checking pressure drop across the heat exchanger and comparing it to the gures in the unit capacity data tables in the specication catalog. Usually 1.5-2 GPM of ow per ton of cooling capacity is recommended in open loop applications. In dual capacity units, stage 1 is 70% of the total tonnage. Therefore, due to only minor differences in ow rate from low to high, only one solenoid valve should be used. The valve should be sized for full ow. Discharge water from the unit is not contaminated in any manner and can be disposed of in various ways depending

on local building codes (i.e.

recharge well, storm sewer, drain eld, adjacent stream or pond, etc.). Most local codes forbid the use of sanitary sewer

for disposal. Consult your local building and zoning departments to ensure compliance in your area.

Notes: For open loop/ground-

water systems or sytems that

do not contain an antifreeze

solution, set SW2-Switch #2

to the “WELL” position (Refer

to the table on page 21.) Slow

opening/closing solenoid valves (type VM) are recommended to

eliminate water hammer.

Figure 4: Typical Split System Application Open Loop - Well Water

Figure 5: Open Loop Solenoid Valve Connection Option

Typical quick operating external 24V water solenoid valve (type PPV100 or BPV100) wiring.

Figure 9b: Open Loop Solenoid Valve Connection Option

Typical slow operating external 24V water solenoid valve (type VM) wiring.

ENVISION SERIES INSTALLATION MANUAL

Open Loop - Well Water Systems (continued)

Solenoid Wiring

Water control valves draw their power directly from a unit’s 24V transformer and can overload and possibly burn out the transformer. Check total VA draw of the water valve and ensure that it is under 15 VA.

Water Quality

In ground water situations where scaling could be heavy or where biological growth such as iron bacteria will be present, a closed loop system is recommended. The heat exchanger coils in ground water systems may, over a period of time, lose heat exchange capabilities due to a buildup of mineral deposits inside. These can be cleaned, but only by a qualied service mechanic, as special solutions and pumping equipment are required. Desuperheater coils can likewise become scaled and possibly plugged. In areas with extremely hard water, the owner should be informed that the heat exchanger may require occasional ushing.

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