Heat Controller HTS User Manual

Installation, Operation and

Maintenace Manual

GeoLogix

HTS Series Split System,

Two Stage, 2-5 Tons

1900 Wellworth Ave., Jackson, Michigan 49203

THE QUALITY LEADER IN CONDITIONING AIR

Ph. 517-0787-2100

•

Fax 517-787-9341

•

www.heatcontroller.com

•

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Table of Contents

Model Nomenclature . . . . . . . . . . . . . . . . . . . . 3

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . 5

Equipment Selection . . . . . . . . . . . . . . . . . . . . 6

Air Coil Match-ups . . . . . . . . . . . . . . . . . . . . . . 6

Air Handler Selection . . . . . . . . . . . . . . . . . . . 7

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9

Water Connections . . . . . . . . . . . . . . . . . . . . . 9

Ground Loop Applications . . . . . . . . . . . . . . . . 9-11

Open Loop - Ground Water Systems . . . . . . . . 12-13

Water Quality Standards . . . . . . . . . . . . . . . . . 14

Lineset Information . . . . . . . . . . . . . . . . . . . . . 15

Refrigeration Installation . . . . . . . . . . . . . . . . . 15-19

Hot Water Generator . . . . . . . . . . . . . . . . . . . . 20-22

Electrical - Line Voltage . . . . . . . . . . . . . . . . . 23

Electrical - Low Voltage Wiring . . . . . . . . . . . . 24

Low Water Temperature Cutout Selection . . . 24

Thermostat Wiring . . . . . . . . . . . . . . . . . . . . . . 25

DXM2 Controls . . . . . . . . . . . . . . . . . . . . . . . . 26-27

Wire Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Unit Commissioning and

Operating Conditions . . . . . . . . . . . . . . . . . . . . 29

Unit Start-Up and Operating Conditions . . . . . 30

Unit Start-Up Procedure . . . . . . . . . . . . . . . . . 30-31

Unit Operating Conditions . . . . . . . . . . . . . . . . 32-33

Preventive Maintenance . . . . . . . . . . . . . . . . . 34

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . 35-37

DXM2 Process Flow Chart. . . . . . . . . . . . . . . . 38

Functional & Performance Troubleshooting . . 39-42

Heat Controller, Inc. Water-Source Heating and Cooling Systems2

The Quality Leader in Conditioning Air

1 2

SERIES

HT = Heat Controller Two Stage

CONFIGURATION

S = SPLIT

REVISION LEVEL

A = Obsolete 6-29-12 B = Current Revision DXM2 Effective 6-29-12

UNIT SIZE

024 036 048 060

Model Nomenclature : for Indoor Split Series

4 5 6 7

VO LTAGE

1 = 208-230/60/1

Residential Split - 60Hz R410A

91011121314

B0 2 4 D1 0 1 N N N

RETURN AIR FLOW CONFIGURATION

N = NOT APPLICABLE

HEAT EXCHANGER OPTIONS

Standard

Rev.: 03 August, 2012

SUPPLY AIR FLOW & MOTOR CONFIGURATION

N = NOT APPLICABLE

Copper

Cupro-Nickel

CONTROLS

C = CXM (Revision A only) D = DXM2 (Revision B only)

WATER CIRCUIT OPTIONS

0 = None 1 = HWG w/Internal Pump

CABINET

0 = Residential

www.heatcontroller.com

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Safety

Warnings, cautions and notices appear throughout this manual. Read these items carefully before attempting any installation, service or troubleshooting of the equipment.

DANGER: Indicates an immediate hazardous situation, which if not avoided will result in death or serious injury. DANGER labels on unit access panels must be observed.

WARNING: Indicates a potentially hazardous situation, which if not avoided could result in death or serious injury.

CAUTION: Indicates a potentially hazardous situation or an unsafe practice, which if not avoided could result in minor or moderate injury or product or property damage.

NOTICE: Notiﬁ cation of installation, operation or maintenance information, which is important, but which is not hazard-related.

WARNING! All refrigerant discharged from this unit must be recovered WITHOUT EXCEPTION. Technicians must follow industry accepted guidelines and all local, state, and federal statutes for the recovery and disposal of refrigerants. If a compressor is removed from this unit, refrigerant circuit oil will remain in the compressor. To avoid leakage of compressor oil, refrigerant lines of the compressor must be sealed after it is removed.

CAUTION! To avoid equipment damage, DO NOT use these units as a source of heating or cooling during the construction process. The mechanical components and ﬁ lters will quickly become clogged with construction dirt and debris, which may cause system damage.

 WARNING! 

 CAUTION! 

 WARNING! 

WARNING! Verify refrigerant type before proceeding. Units are shipped with R-410A refrigerants. The unit label will indicate which refrigerant is provided. The EarthPure® Application and Service Manual should be read and understood before attempting to service refrigerant circuits with R-410A

 WARNING! 

WARNING! To avoid the release of refrigerant into the

atmosphere, the refrigerant circuit of this unit must be serviced only by technicians who meet local, state, and federal proﬁ ciency requirements.

Heat Controller, Inc. Water-Source Heating and Cooling Systems4

The Quality Leader in Conditioning Air

Inspection

Upon receipt of the equipment, carefully check the shipment against the bill of lading. Make sure all units have been received. Inspect the packaging of each unit, and inspect each unit for damage. Insure that the carrier makes proper notation of any shortages or damage on all copies of the freight bill and completes a common carrier inspection report. Concealed damage not discovered during unloading must be reported to the carrier within 15 days of receipt of shipment. If not ﬁ led within 15 days, the freight company can deny the claim without recourse. Note: It is the responsibility of the purchaser to ﬁ le all necessary claims with the carrier. Notify your equipment supplier of all damage within ﬁ fteen (15) days of shipment.

Storage

Equipment should be stored in its original packaging in a clean, dry area. Store units in an upright position at all times. Stack units a maximum of 3 units high.

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

General Information

4. Inspect all electrical connections. Connections must be clean and tight at the terminals.

5. Loosen compressor bolts on units equipped with compressor spring vibration isolation until the compressor rides freely on the springs. Remove shipping restraints.

6. Locate and verify any hot water generator (HWG) or other accessory kit located in the compressor section.

 CAUTION! 

WARNING! All refrigerant discharged from this unit must

be recovered WITHOUT EXCEPTION. Technicians must follow industry accepted guidelines and all local, state, and federal statutes for the recovery and disposal of refrigerants. If a compressor is removed from this unit, refrigerant circuit oil will remain in the compressor. To avoid leakage of compressor oil, refrigerant lines of the compressor must be sealed after it is removed.

Unit Protection

Cover units on the job site with either the original packaging or an equivalent protective covering. Cap the open ends of pipes stored on the job site. In areas where painting, plastering, and/or spraying has not been completed, all due precautions must be taken to avoid physical damage to the units and contamination by foreign material. Physical damage and contamination may prevent proper start-up and may result in costly equipment clean-up.

Examine all pipes, ﬁ ttings, and valves before installing any of the system components. Remove any dirt or debris found in or on these components.

Pre-Installation

Installation, Operation, and Maintenance instructions are provided with each unit. Horizontal equipment is designed for installation above false ceiling or in a ceiling plenum. Other unit conﬁ gurations are typically installed in a mechanical room. The installation site chosen should include adequate service clearance around the unit. Before unit start-up, read all manuals and become familiar with the unit and its operation. Thoroughly check the system before operation.

Prepare units for installation as follows:

1. Compare the electrical data on the unit nameplate with ordering and shipping information to verify that the correct unit has been shipped.

2. Keep the cabinet covered with the original packaging until installation is complete and all plastering, painting, etc. is ﬁ nished.

3. Verify refrigerant tubing is free of kinks or dents and that it does not touch other unit components.

 CAUTION! 

CAUTION! To avoid equipment damage, DO NOT use

these units as a source of heating or cooling during the construction process. The mechanical components and ﬁ lters will quickly become clogged with construction dirt and debris, which may cause system damage.

www.heatcontroller.com

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Equipment Selection

NOTICE! AHRI matched systems are required for warranty and applicable federal tax credits.

The installation of geothermal heat pump units and all associated components, parts, and accessories which make up the installation shall be in accordance with the regulations of ALL authorities having jurisdiction and MUST conform to all applicable codes. It is the responsibility of the installing contractor to determine and comply with ALL applicable codes and regulations.

General

Proper indoor coil selection is critical to system efﬁ ciency. Using an older-model coil can affect efﬁ ciency and may not provide the customer with rated or advertised EER and COP. Coil design and technology have dramatically improved operating efﬁ ciency and capacity in the past 20 years. Homeowners using an older coil are not reaping these cost savings and comfort beneﬁ ts. NEVER MATCH AN R-22 INDOOR COIL WITH AN R-410A COMPRESSOR SECTION.

Newer indoor coils have a larger surface area, enhanced ﬁ n design, and grooved tubing. These features provide a larger area for heat transfer, improving efﬁ ciency and expanding capacity. Typical older coils may only have one-third to onehalf the face area of these redesigned coils.

Indoor Coil Selection - HTS GeoLogix

HCI split system heat pumps are rated in the AHRI directory with a speciﬁ c indoor coil match. GeoLogix

(HTS) models are rated with Heat Controller WDG Series air handlers and MWG Series coils as shown in Table 1a. Other brands of air handlers may attain the same AHRI ratings providing that the speciﬁ cations meet or exceed those listed in Table 1a AND Table 1b. However, for warranty and federal tax credits, an AHRI matched system is required. An ECM motor and TXV is required. Cap tubes and ﬁ xed oriﬁ ces are not acceptable. PSC fans may be used if matched to Table 1b, but will not meet AHRI ratings. If using PSC fan, compressor section must be operated as a single stage unit (i.e. wired for either 1st stage or 2nd stage). Without the ability to vary the airﬂ ow, supply air temperatures may not be acceptable if the compressor is allowed to change stages when used with a PSC fan motor.

Table 1a: WDG/MWG Indoor Section Matches for AHRI Ratings

Compressor Section Model 024 036 048 060

Indoor Section Model 024 036 048 060

Refrigerant HFC-410A

Metering Device TXV (required)

Air Coil Type Rows Dimensions

Cabinet Conﬁ guration

WDG Series Fan Motor Type - HP ECM - 1/2 ECM - 1/2 ECM - 1 ECM - 1

Table 1b: Tranquility®

Model* Nominal Tons*

024 - Part Load 1.5 50 530 19.2 - 22.4

024 - Full Load 2.0 52 880 24.2 - 28.2

036 - Part Load 2.5 51 700 25.2 - 29.2

036 - Full Load 3.0 50 1200 34.5 - 40.1

048 - Part Load 3.5 47 1000 34.3 - 39.9

048 - Full Load 4.0 48 1650 46.3 - 53.8

060 - Full Load 5.0 48 1850 54.5 - 63.3

* Nominal tons are at AHRI/ISO 13256-1 GLHP conditions. Two-stage units may be operated in single-stage mode if desired, where smaller capacity is required.

For example, a model 024 may be used as a 1-1/2 ton unit if “locked” into 1st stage operation only. If PSC fan is used, unit must be “locked” into either 1st or 2nd stage. An ECM fan is required for two-stage operation and for AHRI ratings. Size air handler for “Full Load” if operating in two-stage mode.

**When selecting an air handler based upon the above conditions, choose entering WB temperature of 67ºF. Use evaporator temperature, CFM and capacity

requirements as listed above. The air handler capacity must be at least at the minimum capacity shown in the table in order for the AHRI rating condition to be valid. See Figure 1 for an example selection.

27 Air Handler Characteristics for Brands other than Above Models

N 2

14 x 17

Evaporator

Temp (ºF)

N 2

24 x 17

Upﬂ ow/Downﬂ ow/Horizontal (Multipoise)

CFM

N 2

24 x 17

Capacity

(MBtuh)**

N 3

24 x 17

Heat Controller, Inc. Water-Source Heating and Cooling Systems6

The Quality Leader in Conditioning Air

Air Handler Selection Example

Figure 1 shows a typical performance table for a heat pump air handler. Suppose the evaporator temperature required is 50ºF, the capacity required is 35,000 Btuh and the airﬂ ow required is 1,200 CFM. Each evaporator temperature listed in the table shows three wet bulb temperatures. As recommended in the table notes above, select the 67ºF WB column. At 1,200 CFM, the model 003 capacity is 36 MBtuh, which is higher than the minimum capacity required of 35,000 Btuh. In this example, model 003 would be the appropriate match.

Figure 1: Selecting Air Handler

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Equipment Selection

www.heatcontroller.com

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Installation

NOTICE! Failure to remove shipping brackets from spring-mounted compressors will cause excessive noise, and could cause component failure due to added vibration.

The installation of water source heat pump units and all associated components, parts and accessories which make up the installation shall be in accordance with the regulations of ALL authorities having jurisdiction and MUST conform to all applicable codes. It is the responsibility of the installing contractor to determine and comply with ALL applicable codes and regulations.

Removing Existing Condensing Unit (Where Applicable)

1. Pump down condensing unit. Close the liquid line service valve of existing condensing unit and start compressor to pump refrigerant back into compressor section. Then, close suction service valve while compressor is still running to trap refrigerant in outdoor section. Immediately kill power to the condensing unit.

2. Disconnect power and low voltage and remove old condensing unit. Cut or unbraze line set from unit. Remove condensing unit.

3. If condensing unit is not operational or will not pump down, refrigerant should be recovered using appropriate equipment.

4. Replace line set, especially if upgrading system from R-22 to R-410A refrigerant. If line set cannot be replaced, it must be thoroughly ﬂ ushed before installing new compressor section. R-410A compressors use POE oil instead of mineral oil (R-22 systems). Mineral oil is not compatible with POE oil, and could cause system damage if not completely ﬂ ushed from the line set.

Any access panel screws that would be difﬁ cult to remove after the unit is installed should be removed prior to setting the unit. Refer to Figure 2 for an illustration of a typical installation. Refer to “Physical Dimensions” section for dimensional data. Conform to the following guidelines when selecting unit location:

1. Install the unit on a piece of rubber, neoprene or other mounting pad material for sound isolation. The pad should be at least 3/8” [10mm] to 1/2” [13mm] in thickness. Extend the pad beyond all four edges of the unit.

2. Provide adequate clearance for maintenance and service. Do not block access panels with piping, conduit or other materials.

3. Provide access for servicing the compressor and coils without removing the unit.

4. Provide an unobstructed path to the unit within the closet or mechanical room. Space should be sufﬁ cient to allow removal of the unit, if necessary.

5. In limited side access installations, pre-removal of the control box side mounting screws will allow control box removal for future servicing (R22 units only).

6. Provide access to water valves and ﬁ ttings and screwdriver access to the unit side panels and all electrical connections.

Air Handler and Coil Installation

This manual speciﬁ cally addresses the compressor section of the system. Air handler and coil location and installation should be according to the instructions provided with the air handling/coil unit.

Indoor Compressor Section Location

The HTS indoor compressor section is not designed for outdoor installation. Locate the unit in an INDOOR area that allows enough space for service personnel to perform typical maintenance or repairs without removing unit. Units are typically installed in a mechanical room or closet. Never install units in areas subject to freezing or where humidity levels could cause cabinet condensation (such as unconditioned spaces subject to 100% outside air). Consideration should be given to access for easy removal of service access panels. Provide sufﬁ cient room to make water, electrical, and line set connections.

Heat Controller, Inc. Water-Source Heating and Cooling Systems8

Gasket

Swivel Nut

Stainless steel

snap ring

Brass Adaptor

Hand Tighten

Only!

Do Not

Overtighten!

The Quality Leader in Conditioning Air

Figure 2: HTS Installation

External Flow Controller Mounting The Flow Controller can be mounted beside the unit as shown in Figure 4. Review the Flow Controller installation manual for more details.

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Installation

The female locking ring is threaded onto the pipe threads which holds the male pipe end against the rubber gasket, and seals the joint. HAND TIGHTEN ONLY! DO NOT OVERTIGHTEN!

Water Connections-Residential (Distributor) Models Residential models utilize swivel piping ﬁ ttings for water connections that are rated for 450 psi (3101 kPa) operating pressure. The connections have a rubber gasket seal similar to a garden hose gasket, which when mated to the ﬂ ush end of most 1” threaded male pipe ﬁ ttings pro- vides a leak-free seal without the need for thread sealing tape or joint compound. Insure that the rubber seal is in the swivel connector prior to attempting any connection (rubber seals are shipped attached to the swivel connector). DO NOT OVER TIGHTEN or leaks may occur.

GROUND-LOOP HEAT PUMP APPLICATIONS

 CAUTION! 

CAUTION! The following instructions represent industry

accepted installation practices for closed loop earth coupled heat pump systems. Instructions are provided to assist the contractor in installing trouble free ground loops. These instructions are recommendations only. State/provincial and local codes MUST be followed and installation MUST conform to ALL applicable codes. It is the responsibility of the installing contractor to determine and comply with ALL applicable codes and regulations.

Pre-Installation

Prior to installation, locate and mark all existing underground utilities, piping, etc. Install loops for new construction before

Figure 3: Water Connections (Indoor Compressor Section)

sidewalks, patios, driveways, and other construction has begun. During construction, accurately mark all ground loop piping on the plot plan as an aid in avoiding potential future damage to the installation.

Piping Installation

The typical closed loop ground source system is shown in Figure 3. All earth loop piping materials should be limited to polyethylene fusion only for in-ground sections of the loop. Galvanized or steel ﬁ ttings should not be used at any time due to their tendency to corrode. All plastic to metal threaded ﬁ ttings should be avoided due to their potential to leak in earth coupled applications. A ﬂ anged ﬁ tting should be substituted. P/T plugs should be used so that ﬂ ow can be measured using the pressure drop of the unit heat exchanger.

www.heatcontroller.com

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Ground-Loop Heat Pump Applications

Earth loop temperatures can range between 25 and 110°F [-4 to 43°C]. Flow rates between 2.25 and 3 gpm per ton [2.41 to

3.23 l/m per kW] of cooling capacity is recommended in these applications.

Test individual horizontal loop circuits before backﬁ lling. Test vertical U-bends and pond loop assemblies prior to installation. Pressures of at least 100 psi [689 kPa] should be used when testing. Do not exceed the pipe pressure rating. Test entire system when all loops are assembled.

Flushing the Earth Loop

Once piping is completed between the unit, Flow Controller and the ground loop (Figure 4), the loop is ready for ﬁ nal purging and charging. A ﬂ ush cart with at least a 1.5 hp [1.1 kW] pump is required to achieve enough ﬂ uid velocity in the loop piping system to purge air and dirt particles. An antifreeze solution is used in most areas to prevent freezing. All air and debris must be removed from the earth loop piping before operation. Flush the loop with a high volume of water at a minimum velocity of 2 fps (0.6 m/s) in all piping. The steps below must be followed for proper ﬂ ushing.

1. Fill loop with water from a garden hose through the ﬂ ush cart before using the ﬂ ush cart pump to insure an even ﬁ ll.

2. Once full, the ﬂ ushing process can begin. Do not allow the water level in the ﬂ ush cart tank to drop below the pump inlet line to avoid air being pumped back out to the earth loop.

3. Try to maintain a ﬂ uid level in the tank above the return tee so that air cannot be continuously mixed back into the ﬂ uid. Surges of 50 psi (345 kPa) can be used to help purge air pockets by simply shutting off the return valve going into the ﬂ ush cart reservoir. This “dead heads” the pump to 50 psi (345 kPa). To purge, dead head the pump until maximum pumping pressure is reached. Open the return valve and a pressure surge will be sent through the loop to help purge air pockets from the piping system.

4. Notice the drop in ﬂ uid level in the ﬂ ush cart tank when the return valve is shut off. If air is adequately purged from the system, the level will drop only 1-2 inches (2.5 5 cm) in a 10” (25 cm) diameter PVC ﬂ ush tank (about a half gallon [2.3 liters]), since liquids are incompressible. If the level drops more than this, ﬂ ushing should continue since air is still being compressed in the loop ﬂ uid. Perform the “dead head” procedure a number of times.

Note: This ﬂ uid level drop is your only indication of air in the loop.

Pressures will be higher in the winter months than during the cooling season. This ﬂ uctuation is normal and should be considered when charging the system initially. Run the unit in either heating or cooling for a number of minutes to condition the loop to a homogenous temperature. This is a good time for tool cleanup, piping insulation, etc. Then, perform ﬁ nal ﬂ ush and pressurize the loop to a static pressure of 50-75 psi [345-517 kPa] (winter) or 35-40 psi [241-276 kPa] (summer). After pressurization, be sure to loosen the plug at the end of the Grundfos loop pump motor(s) to allow trapped air to be discharged and to insure the motor housing has been ﬂ ooded. This is not required for Taco circulators. Insure that the Flow Controller provides adequate ﬂ ow through the unit by checking pressure drop across the heat exchanger and compare to the pressure drop tables at the back of the manual.

Antifreeze

In areas where minimum entering loop temperatures drop below 40°F [5°C] or where piping will be routed through areas subject to freezing, antifreeze is required. Alcohols and glycols are commonly used as antifreeze; however your local sales manager should be consulted for the antifreeze best suited to your area. Freeze protection should be maintained to 15°F [9°C] below the lowest expected entering loop temperature. For example, if 30°F [-1°C] is the minimum expected entering loop temperature, the leaving loop temperature would be 25 to 22°F [-4 to -6°C] and freeze protection should be at 15°F [-10°C]. Calculation is as follows: 30°F - 15°F = 15°F [-1°C - 9°C = -10°C].

All alcohols should be premixed and pumped from a reservoir outside of the building when possible or introduced under the water level to prevent fumes. Calculate the total volume of ﬂ uid in the piping system. Then use the percentage by volume shown in Table 2 for the amount of antifreeze needed. Antifreeze concentration should be checked from a well mixed sample using a hydrometer to measure speciﬁ c gravity.

Low Water Temperature Cutout Setting - DXM2 Control

When antifreeze is selected, the LT1 jumper (JW3) should be clipped to select the low temperature (antifreeze 13°F [-10.6°C]) set point and avoid nuisance faults (see “Low Water Temperature Cutout Selection” in this manual). NOTE:

Low water temperature operation requires extended range equipment.

Antifreeze may be added before, during or after the ﬂ ushing procedure. However, depending upon which time is chosen, antifreeze could be wasted when emptying the ﬂ ush cart tank. See antifreeze section for more details.

Loop static pressure will ﬂ uctuate with the seasons.

Heat Controller, Inc. Water-Source Heating and Cooling Systems10

The Quality Leader in Conditioning Air

Table 2: Approximate Fluid Volume (U.S. gal. [L]) per 100’ of Pipe

Fluid Volume (gal [liters] per 100’ [30 meters] Pipe)

Pipe Size Volume (gal) [liters]

1” 4.1 [15.3]

Copper

Rubber Hose 1” 3.9 [14.6]

Polyethylene

Unit Heat

Exchanger

Flush Cart Tank

[254mm x 91.4cm tall]

1.25” 6.4 [23.8]

2.5” 9.2 [34.3]

3/4” IPS SDR11 2.8 [10.4]

1” IPS SDR11 4.5 [16.7]

1.25” IPS SDR11 8.0 [29,8]

1.5” IPS SDR11 10.9 [40.7]

2” IPS SDR11 18.0 [67.0]

1.25” IPS SCH40 8.3 [30.9}

1.5” IPS SCH40 10.9 [40.7]

2” IPS SCH40 17.0 [63.4]

Typical 1.0 [3.8]

10” Dia x 3ft tall

10 [37.9]

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Ground-Loop Heat Pump Applications

Figure 4: Loop Connection (Indoor Compressor Section)

To Loop

Flow

Controller

Unit Power Disconnect

Insulated

Hose Kit

AH & Thermostat Wiring

Air Pad or Extruded polystyrene insulation board

NOTICE! Cabinet opening around loop piping (outdoor compressor section) must be sealed to prevent entry of rodents that could potentially damage unit wiring by chewing on the insulation.

P/T Plugs

Table 3: Antifreeze Percentages by Volume

Type

10°F [-12.2°C] 15°F [-9.4°C] 20°F [-6.7°C] 25°F [-3.9°C]

Methanol 100% USP food grade Propylene Glycol Ethanol*

* Must not be denatured with any petroleum based product

Minimum Temperature for Low Temperature Protection

25% 38% 29%

21% 25% 25%

16% 22% 20%

10% 15% 14%

www.heatcontroller.com

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Ground-Water Heat Pump Applications -Compressor Section Only

Open Loop - Ground Water Systems (“Indoor” Compressor Section Only)

The “outdoor” version of the compressor section may not be used with open loop systems due to potential freezing of water piping. Typical open loop piping is shown in Figure

9. Shut off valves should be included for ease of servicing.

Boiler drains or other valves should be “tee’d” into the lines to allow acid ﬂ ushing of the heat exchanger. Shut off valves should be positioned to allow ﬂ ow through the coax via the boiler drains without allowing ﬂ ow into the piping system. P/T plugs should be used so that pressure drop and temperature can be measured. Piping materials should be limited to copper or PVC SCH80. Note: Due to the pressure and temperature extremes, PVC SCH40 is not recommended.

Water quantity should be plentiful and of good quality. Consult Table 4 for water quality guidelines. The unit can be ordered with either a copper or cupro-nickel water heat exchanger. Consult Table 4 for recommendations. Copper is recommended for closed loop systems and open loop ground water systems that are not high in mineral content or corrosiveness. In conditions anticipating heavy scale formation or in brackish water, a cupro-nickel heat exchanger is recommended. In ground water situations where scaling could be heavy or where biological growth such as iron bacteria will be present, an open loop system is not recommended. Heat exchanger coils may over time lose heat exchange capabilities due to build up of mineral deposits. Heat exchangers must only be serviced by a qualiﬁ ed technician, as acid and special pumping equipment is 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 acid ﬂ ushing. In some cases, the desuperheater option should not be recommended due to hard water conditions and additional maintenance required.

Expansion Tank and Pump

Use a closed, bladder-type expansion tank to minimize mineral formation due to air exposure. The expansion tank should be sized to provide at least one minute continuous run time of the pump using its drawdown capacity rating to prevent pump short cycling. Discharge water from the unit is not contaminated in any manner and can be disposed of in various ways, depending on local building codes (e.g. recharge well, storm sewer, drain ﬁ eld, adjacent stream or pond, etc.). Most local codes forbid the use of sanitary sewer for disposal. Consult your local building and zoning department to assure compliance in your area.

The pump should be sized to handle the home’s domestic water load (typically 5-9 gpm [23-41 l/m]) plus the ﬂ ow rate required for the heat pump. Pump sizing and expansion tank must be chosen as complimentary items. For example, an expansion tank that is too small can causing premature pump failure due to short cycling. Variable speed pumping applications should be considered for the inherent energy savings and smaller expansion tank requirements.

Motorized Modulating Water Control Valve

Note the placement of the water control valve in ﬁ gure 9. Always maintain water pressure in the heat exchanger by placing the water control valve(s) on the discharge line to prevent mineral precipitation during the off-cycle. Pilot operated slow closing valves are recommended to reduce water hammer. If water hammer persists, a mini-expansion tank can be mounted on the piping to help absorb the excess hammer shock. This valve regulates the ﬂ ow using entering and leaving water delta-T of the system. Entering and leaving water temperature is read on the communicating thermostat or conﬁ guration/diagnostic service tool. Further details on valve operation are described later in this manual.

Water Quality Standards

Table 4 should be consulted for water quality requirements. Scaling potential should be assessed using the pH/Calcium hardness method. If the pH <7.5 and the Calcium hardness is less than 100 ppm, scaling potential is low. If this method yields numbers out of range of those listed, the Ryznar Stability and Langelier Saturation indecies should be calculated. Use the appropriate scaling surface temperature for the application, 150°F [66°C] for direct use (well water/ open loop) and DHW (desuperheater); 90°F [32°F] for indirect use. A monitoring plan should be implemented in these probable scaling situations. Other water quality issues such as iron fouling, corrosion prevention and erosion and clogging should be referenced in Table 4.

Heat Controller, Inc. Water-Source Heating and Cooling Systems12

The Quality Leader in Conditioning Air

Ground-Water Heat Pump Applications

Water Coil Low Temperature Limit Setting

For all open loop systems the 30°F [-1.1°C] FP1 setting (factory setting-water) should be used to avoid freeze damage to the unit. See “Low Water Temperature Cutout Selection” in this manual for details on the low limit setting.

 CAUTION! 

CAUTION! Refrigerant pressure activated water regulating

valves should never be used with HCI equipment.

Figure 9: Water Well Connections

Water

Control

Va l v e

Flow

Regulator

Pressure

Tank

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

To manually open the internal modulating motorized water valve in HTS024 - 048 push down on the handle to unlock it. Then rotate the handle to the open position as shown in Figure 9a. This fully opens the valve for ﬂ ushing. Once ﬂ ushing is complete, return the valve handle to its normally closed position.

To manually open the internal modulating motorized water valve in HTS060, push down on the lock release button while turning the handle to the open position as shown in Figure 9a. This fully opens the valve for ﬂ ushing. Once ﬂ ushing is complete, press the lock release again and return the valve handle to its normally closed position.

Figure 9a: Optional Modulating Motorized Valve Positions

Sizes 026-049 Sizes 064-072

Sizes 024 - 048 Sizes 060

Closed Closed

Water Out

Shut-Off

Optional

Filter

Boiler

P/T Plugs

Optional Modulating Motorized Valve - For Open Loop Applications

A low Cv modulating motorized valve is used for this application to provide more precise control against the higher system pressure differential of open loop applications.

The Motorized Modulating Valve is regulated by the Communicating DXM2 board based on entering and leaving water temperature (ΔT). The DXM2 board gives a 0-10v signal to determine ﬂ ow rate. The motorized modulating valve defaults to closed position if it loses signal but still has 24V power running to it. If the motorized modulating valve loses both signal from the DXM2 board AND 24V power, it will remain in the same position it was in when it lost 24V power. DO NOT USE open loop units in closed loop applications due to signiﬁ cant pressure drop through the open loop motorized modulating valve.

Drains

Valve

Water In

/RFN5HOHDVH

Open Open

www.heatcontroller.com

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

Residential Split - 60Hz R410A

Rev.: 03 August, 2012

Water Quality Standards

Table 4: Water Quality Standards

Water Quality

Parameter

Material

Closed

Recirculating

Open Loop and Recirculating Well

Scaling Potential - Primary Measurement

Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below

pH/Calcium Hardness

Method

All

pH < 7.5 and Ca Hardness <100ppm

Index Limits for Probable Scaling Situations - (Operation outside these limits is not recommended)

Scaling indexes should be calculated at 66°C for direct use and HWG applications, and at 32°C for indirect HX use. A monitoring plan should be implemented.

Ryznar Stability Index If >7.5 minimize steel pipe use.

Langelier Saturation Index

All

- 6.0 - 7.5

If <-0.5 minimize steel pipe use. Based upon 66°C HWG and

-0.5 to +0.5

Direct well, 29°C Indirect Well HX

Iron Fouling

Iron Fe2+(Ferrous) (Bacterial Iron potential)

Iron Fouling

All

(ferrous)>0.2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria.

If Fe

Above this level deposition will occur .

<0.2 ppm (Ferrous)

<0.5 ppm of Oxygen

Corrosion Prevention

Hydrogen Sulfide (H

Ammonia ion as hydroxide, chloride, nitrate and sulfate compounds

Maximum Chloride Levels

6 - 8.5

All

Copper

Cupronickel

304 S 316 S

Titanium - >1000 ppm >550 ppm >375 ppm

Monitor/treat as

needed

- <0.5 ppm

- <20ppm NR NR

S - <400 ppm <250 pp m <150 ppm S - <1000 ppm <550 ppm < 375 ppm

- <150 ppm NR NR

Minimize steel pipe below 7 and no open tanks with pH <8

At H

S>0.2 ppm, avoid use of copper and copper nickel piping or HX's.

Copper alloy (bronze or brass) cast components are OK to <0.5 ppm.

Rotten egg smell appears at 0.5 ppm level.

Maximum Allowable at maximum water temperature.

10$C24$C38

6 - 8.5

<0.5 ppm

Erosion and Clogging

<10 ppm of particles and a maximum velocity of 1.8 m/s

Particulate Size and Erosion

The Water Quality Table provides water quality requirements for coaxial heat exchangers. When water properties are outside of those requirements, an external secondary heat exchanger must be used to isolate the heat pump heat exchanger from the unsuitable water. Failure to do so will void the warranty for the coaxial heat exchanger.

Notes:

&ORVHG5HFLUFXODWLQJV\VWHPLVLGHQWLILHGE\D

5HFLUFXODWLQJRSHQZHOOVVKRXOGREVHUYHWKHRSHQUHFLUFXODWLQJGHVLJQFRQVLGHUDWLRQV

15Application not recommended. 1RGHVLJQ0D[LPXP

All

Filtered for maximum 841 micron [0.84 mm, 20 mesh] size.

closed pressurized piping system.

<10 ppm (<1 ppm "sandfree” for reinjection) of particles and a maximum velocity of 1.8 m/s. Filtered for maximum 841 micron 0.84 mm, 20 mesh] size. Any particulate that is not removed can potentially clog components.

Rev.: 3/22/2012

Heat Controller, Inc. Water-Source Heating and Cooling Systems14

+ 30 hidden pages