Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
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 poten tially hazardous situa tion , which if
not avoided could result in death or serious injury.
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.
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!
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!
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.
3
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
General Information
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 filed within 15 days, the
freight company can deny the claim without recourse. Note: It is the
responsibility of the purchaser to file 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.
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 cleanup.
7. Locate and verify any hot water generator (HWG), hanger,
or other accessory kit located in the compressor section or
blower section.
CAUTION!
CAUTION! DO NOT store or install units in corrosive
environments or in locations subject to temperature or
humidity extremes (e.g., attics, garages, rooftops, etc.).
Corrosive conditions and high temperature or humidity can
signifi cantly reduce performance, reliability, and service
life. Always move and store units in an upright position.
Tilting units on their sides may cause equipment damage.
CAUTION!
CAUTION! CUT HAZARD - Failure to follow this caution
may result in personal injury. Sheet metal parts may have
sharp edges or burrs. Use care and wear appropriate
protective clothing, safety glasses and gloves when
handling parts and servicing heat pumps.
Examine all pipes, fittings, 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.
4. Inspect all electrical connections. Connections must be clean
and tight at the terminals.
5. Remove any blower support packaging (water-to-air units
only).
6. Loosen compressor bolts on units equipped with compressor
grommet vibration isolation until the compressor rides freely
on the grommets.
4
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
General Information
Horizontal Unit Location
Units are 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
from the ceiling. Horizontal units are typically installed above a
false ceiling or in a ceiling plenum. 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 the fi lter and access panels. Provide suffi cient room to
make water, electrical, and duct connection(s).
If the unit is located in a confi ned space, such as a closet,
provisions must be made for return air to freely enter the space
by means of a louvered door, etc. 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 3 for an
illustration of a typical installation. Refer to unit specifi cations
catalog for dimensional data.
Conform to the following guidelines when selecting
unit location:
1.
Provide a hinged access door in concealed-spline or plaster
ceilings. Provide removable ceiling tiles in T-bar or lay-in
ceilings. Refer to horizontal unit dimensions for specifi c
series and model in unit specifi cations catalog. Size the
access opening to accommodate the service technician
during the removal or replacement of the compressor and
the removal or installation of the unit itself.
2.
Provide access to hanger brackets, water valves and fi ttings.
Provide screwdriver clearance to access panels, discharge
collars and all electrical connections.
3. DO NOT obstruct the space beneath the unit with piping,
electrical cables and other items that prohibit future removal
of components or the unit itself.
4. Use a manual portable jack/lift to lift and support the weight
of the unit during installation and servicing.
Mounting Horizontal Units
Horizontal units have hanger kits pre-installed from the factory
as shown in Figure 1. Figure 3 shows a typical horizontal unit
installation.
Horizontal heat pumps are typically suspended above a ceiling or
within a soffi t using fi eld supplied, threaded rods sized to support
the weight of the unit.
Use four (4) fi eld supplied threaded rods and factory provided
vibration isolators to suspend the unit. Hang the unit clear of the
fl oor slab above and support the unit by the mounting bracket
assemblies only. DO NOT attach the unit fl ush with the fl oor slab
above.
Pitch the unit toward the drain as shown in Figure 2 to improve
the condensate drainage. On small units (less than 8.8kW) ensure
that unit pitch does not cause condensate leaks inside the
cabinet.
Figure 1: Hanger Bracket
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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.
Figure 2: Horizontal Unit Pitch
1/4” (6.4mm) pitch
per foot for drainage
Drain
Connection
5
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
To obtain maximum performance, the air coil should be
cleaned before start-up. A 10% solution of dishwasher detergent
and water is recommended for both sides of the coil. A thorough
water rinse should follow.
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6
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
Field Conversion of Air Discharge
Overview -
Horizontal units can be fi eld converted between side
(straight) and back (end) discharge using the instructions below.
Note: It is not possible to fi eld convert return air between left or
right return models due to the necessity of refrigeration copper
piping changes.
Preparation - It is best to fi eld convert the unit on the ground
before hanging. If the unit is already hung it should be taken down
for the fi eld conversion.
Side to Back Discharge Conversion
1.
Place unit in well lit area. Remove the screws as shown in
Figure 4 to free top panel and discharge panel.
2. Lift out the access panel and set aside. Lift and rotate the
discharge panel to the other position as shown, being careful
with the blower wiring.
3.
Check blower wire routing and connections for tension or
contact with sheet metal edges. Reroute if necessary .
4. Check refrigerant tubing for contact with
other components.
5. Reinstall top panel and screws noting that the location for
some screws will have changed.
6. Manually spin the fan wheel to ensure that the wheel is not
rubbing or obstructed.
7. Replace access panels.
Figure 4: Left Return Side to Back
Water
Connection End
Water
Connection End
Water
Connection End
Side Discharge
Remove Screws
Move to Side
Replace Screws
Return Air
Rotate
Return Air
Back to Side Discharge Conversion - If the discharge is changed
from back to side, use above instruction noting that illustrations will
be reversed.
Left vs. Right Return - It is not possible to fi eld convert return air
between left or right return models due to the necessity of refrigeration copper piping changes. However, the conversion process of
side to back or back to side discharge for either right or left return
confi guration is the same. In some cases, it may be possible to
rotate the entire unit 180 degrees if the return air connection needs
to be on the opposite side. Note that rotating the unit will move the
piping to the other end of the unit.
Back Discharge
Figure 5: Right Return Side to Back
Return Air
Supply Duct
Side Discharge
Return Air
Return Air
Drain
Discharge Air
Connection End
Water
Connection End
Water
7
Drain
Discharge Air
Back Discharge
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
C
g
Horizontal Installation
ondensate Pipin
Condensate Piping – Horizontal Units
Pitch the unit toward the drain as shown in Figure 2 to improve
the condensate drainage. On small units (less than 2.5 tons/8.8
kW), insure that unit pitch does not cause condensate leaks
inside the cabinet.
Install condensate trap at each unit with the top of the trap
positioned below the unit condensate drain connection as shown
in Figure 6. Design the depth of the trap (water-seal) based
upon the amount of ESP capability of the blower (where 2 inches
[51mm] of ESP capability requires 2 inches [51mm] of trap depth).
As a general rule, 1-1/2 inch [38mm] trap depth is the minimum.
Each unit must be installed with its own individual trap and
connection to the condensate line (main) or riser. Provide a
means to fl ush or blow out the condensate line. DO NOT install
units with a common trap and/or vent.
Always vent the condensate line when dirt or air can collect in
the line or a long horizontal drain line is required. Also vent when
large units are working against higher external static pressure
than other units connected to the same condensate main since
this may cause poor drainage for all units on the line. WHEN A
VENT IS INSTALLED IN THE DRAIN LINE, IT MUST BE LOCATED
AFTER THE TRAP IN THE DIRECTION OF THE CONDENSATE
FLOW.
Figure 6: Horizontal Condensate Connection
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* Some units include a painted drain connection.
Using a threaded pipe or similar device to clear
any excess paint accumulated inside this fitting
may ease final drain line installation.
CAUTION!
CAUTION! Ensure condensate line is pitched toward drain
1/8 inch per ft [11mm per m] of run.
DUCT SYSTEM INSTALLATION
Duct System Installation
The duct system should be sized to handle the design airfl ow
quietly. Refer to Figure 3 for horizontal duct system details or
fi gure 8 for vertical duct system details. A fl exible connector is
recommended for both discharge and return air duct connections
on metal duct systems to eliminate the transfer of vibration to
the duct system. To maximize sound attenuation of the unit
blower, the supply and return plenums should include internal
fi berglass duct liner or be constructed from ductboard for the
fi rst few feet. Application of the unit to uninsulated ductwork
in an unconditioned space is not recommended, as the unit’s
performance will be adversely affected.
At least one 90° elbow should be included in the supply duct to
reduce air noise. If air noise or excessive air fl ow is a problem,
the blower speed can be changed. For airfl ow charts, consult
specifi cations catalog for the series and model of the specifi c
unit.
If the unit is connected to existing ductwork, a previous check
should have been made to insure that the ductwork has the
capacity to handle the airfl ow required for the unit. If ducting is
too small, as in the replacement of a heating only system, larger
ductwork should be installed. All existing ductwork should be
checked for leaks and repaired as necessary.
8
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
Vertical Installation
Vertical Unit Location
Units are 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
from the mechanical room/closet. Vertical 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 the fi lter and access panels. Provide suffi cient
room to make water, electrical, and duct connection(s).
If the unit is located in a confi ned space, such as a closet,
provisions must be made for return air to freely enter the space
by means of a louvered door, etc. 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 Figures 7 and 8
for typical installation illustrations. Refer to unit specifi cations
catalog for dimensional data.
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 fi lter replacement and drain
pan cleaning. Do not block fi lter access with piping, conduit
or other materials. Refer to unit specifi cations for dimensional
data.
3. Provide access for fan and fan motor maintenance and 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. Provide access to water valves and fi ttings and screwdriver
access to the unit side panels, discharge collar and all
electrical connections.
Downfl ow units may be installed directly on the fl oor. The
optional internal electric heat is rated for zero clearance to
combustible materials.
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.
Figure 7: Vertical Unit Mounting
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Figure 8: Typical Vertical Unit Installation Using Ducted
Return Air
Internally insulate supply
duct for first 1.2 m each way
to reduce noise
Use turning vanes in
supply transition
Flexible canvas duct
connector to reduce
noise and vibration
Rounded return
transition
Internally insulate return
transition duct to reduce
noise
9
Rev.: 6/2/09S
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
Vertical Installation
Sound Attenuation for Vertical Units - Sound attenuation is
achieved by enclosing the unit within a small mechanical room
or a closet. Additional measures for sound control include the
following:
1. Mount the unit so that the return air inlet is 90° to the
return air grille. Refer to Figure 9. Install a sound baffl e as
illustrated to reduce line-of sight sound transmitted through
return air grilles.
2.
Mount the unit on an Unit Isolation Pad to minimize vibration
transmission to the building structure. For more information on
Unit Isolation Pads, contact your distributor.
Figure 9: Vertical Sound Attenuation
Return
Air Inlet
Condensate Piping for Vertical Units - Vertical units utilize a
condensate hose inside the cabinet as a trapping loop; therefore
an external trap is not necessary . Figure 10a shows typical
condensate connections. Figure 10b illustrates the internal trap
for a typical vertical heat pump. Each unit must be installed with
its own individual vent (where necessary) and a means to fl ush
or blow out the condensate drain line. Do not install units with a
common trap and/or vent.
Figure 10a: Vertical Condensate Drain
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* Some units include a painted drain connection.
Using a threaded pipe or similar device to clear
any excess paint accumulated inside this fitting
may ease final drain line installation.
Figure 10b: Vertical Internal Condensate Trap
10
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
High and
Low Voltage
Knockouts
Vibration Isolation Pad
To Thermostat
Water Connection Installation
External Flow Controller Mounting
The Flow Controller can be mounted beside the unit as shown
in Figure 12. Review the Flow Controller installation manual for
more details.
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 provides a leak-free seal without
the need for thread sealing tape or joint compound. Check for
burrs and ensure 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
Figure 12: Typical Ground-Loop Application
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!
Figure 11: Water Connections
Swivel Nut
Stainless steel
snap ring
Gasket
Hand Tighten
Only!
Do Not
Overtighten!
Brass Adaptor
Pre-Installation
Prior to installation, locate and mark all existing underground
utilities, piping, etc. Install loops for new construction before
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.
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.
Piping Installation
The typical closed loop ground source system is shown in Figure
12. 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.
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 12), 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
11
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
Ground-Loop Heat Pump Applications
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.
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. 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.
Low temperature 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 low temperature 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 - CXM Control
When antifreeze is selected, the FP1 jumper (JW3) should be
clipped to select the low temperature (antifreeze 10°F [-12.2°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.
Table 1: Approximate Fluid Volume (gal.) per 100' of Pipe
Fluid Volume (gal [liters] per 100’ [30 meters) Pipe)
PipeSizeVolume (gal) [liters]
1”4.1 [15.3]
Copper
Rubber Hose 1”3.9 [14.6]
Polyethylene
Unit Heat ExchangerTypical1.0 [3.8]
Flush Cart Tank
1.25”6.4 [23.8]
2.5”9.2 [34.3]
3/4” IPS SDR112.8 [10.4]
1” iPS SDR114.5 [16.7]
1.25” IPS SDR118.0 [29.8]
1.5” IPS SDR1110.9 [40.7]
2” IPS SDR1118.0 [67.0]
1.25” IPS SCH408.3 [30.9]
1.5” IPS SCH4010.9 [40.7]
2” IPS SCH4017.0 [63.4]
10” Dia x 3ft tall
[254mm x 91.4cm tall]
10 [37.9]
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.
12
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
Ground-Loop Heat Pump Applications
Table 2: Antifreeze Percentages by Volume
Minimum Temperature
Type
Methanol
Propylene Glycol
Ethanol*
* Must not be denatured with any petroleum based product
for Low Temperature Protection
10°F
[-12.2°C]
21%
29%
23%
15°F
[-9.4°C]
17%
24%
20%
[-6.7°C]
GROUND-WATER HEAT PUMP APPLICATIONS
20°F
13%
18%
16%
25°F
[-3.9°C]
8%
12%
11%
Open Loop - Ground Water Systems
Typical open loop piping is shown in Figure 13. 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 3 for water quality guidelines. The unit can be ordered with
either a copper or cupro-nickel water heat exchanger. Consult
table 3 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 cupronickel 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.
Water Quality Standards
Table 3 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 3.
Pressure Tank and Pump
Use a closed, bladder-type pressure tank to minimize mineral
formation due to air exposure. The pressure 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 pressure
tank requirements.
Water Control Valve
Note the placement of the water control valve in fi gure 13. 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. Insure that the
total ‘VA’ draw of the valve can be supplied by the unit transformer.
For instance, a slow closing valve can draw up to 35VA. This
can overload smaller 40 or 50 VA transformers depending on the
other controls in the circuit. A typical pilot operated solenoid valve
draws approximately 15VA (see Figure 22). Note the special wiring
diagrams for slow closing valves (Figures 23 & 24).
Flow Regulation
Flow regulation can be accomplished by two methods. One method
of fl ow regulation involves simply adjusting the ball valve or water
control valve on the discharge line. Measure the pressure drop
through the unit heat exchanger, and determine fl ow rate from
tables 9a through 9c. Since the pressure is constantly varying, two
pressure gauges may be needed. Adjust the valve until the desired
fl ow of 1.5 to 2 gpm per ton [2.0 to 2.6 l/m per kW] is achieved.
A second method of fl ow control requires a fl ow control device
13
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
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Ground-Water Heat Pump Applications
mounted on the outlet of the water control valve. The device is
typically a brass fi tting with an orifi ce of rubber or plastic material
that is designed to allow a specifi ed fl ow rate. On occasion, fl ow
control devices may produce velocity noise that can be reduced
by applying some back pressure from the ball valve located on the
discharge line. Slightly closing the valve will spread the pressure
drop over both devices, lessening the velocity noise. NOTE: When
EWT is below 50°F [10°C], a minimum of 2 gpm per ton (2.6 l/m
per kW) is required.
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.
Figure 13: Typical Open Loop/Well Application
CAUTION!
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with this equipment.
14
Installation, Operation & Maintenance HTV/HTD/HTH SERIESHeat Controller, Inc.
Water Quality Standards
Table 3: Water Quality Standards
Water Quality
Parameter
HX
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.
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.
2
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
Manufacturer
The ClimateMaster Water Quality Table provides water quality requirements for ClimateMaster 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.
15Application not recommended.
1RGHVLJQ0D[LPXP
All
Filtered for maximum
841 micron [0.84 mm,
20 mesh] size.
closed pressurized piping system.
Manufacturer
<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.
C
Rev.: 3/22/2012
15
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