NDS Installation Manual
Geothermal/Water Source Outdoor Split Heat Pump
2 to 6 Tons Dual Capacity
Installation Information
Water Piping Connections
Electrical Data
Startup Procedures
Troubleshooting
Preventive Maintenance
IM1004SN 06/10
NDS INSTALLATION MANUAL
Table of Contents
Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thermostat Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Water Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Model Nomenclature - Air Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Coil Data - Air Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Physical Data - Air Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Model Nomenclature - Envision Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Refrigerant Coil Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Heat Recovery Unit for Domestic Hot Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-19
Microprocessor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-23
Operation Logic Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-26
Line Set Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Pressure/Temperature Conversion Chart for R-410A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Pressure Drop and Recommended Flow Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Unit Startup and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-32
Preventative Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Service Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
NDS INSTALLATION MANUAL
Model Nomenclature
1
N
2
D
3
S
4-6
049
7
A
8
1
9
0
10
A
11
C
Model Type
N = Envision
Coax Options
C = Copper
N = Cupronickel
Compressor Type
D = Dual Capacity
Flow Center
A = None
B = Flow Center*
Cabinet Configuration
S = Outdoor Split
IntelliStart Options
0 = No IntelliStart
3 = IntelliStart
Unit Capacity
026
038
049
064
072
Voltage
1 = 208-230/60/1
Vintage
A = Current
NOTE: *026-049 uses the FC1-GL and 060-072 uses
the FC2-GL, the flow center is factory installed. If these
flow centers do not meet the flow requirements, select
A = None for digit 10.
Physical Characteristics
Model
026
038
52 [1.47]
56 [1.59]
0.7 [2.6]
1.3 [4.9]
Weight - Operating lb. [kg]
189 [85]
236 [107]
Weight - Packaged, lb. [kg]
209 [95]
256 [116]
Compressor (1 each)
Factory Charge R-410A, oz. [kg]
049
064
072
90 [2.55]
92 [2.61]
104 [2.95]
1.6 [6.1]
1.6 [6.1]
2.3 [8.7]
250 [113]
271 [123]
290 [132]
270 [122]
291 [132]
310 [141]
Dual Capacity Scroll
Coax and Water Piping
Coax and Piping Water Volume - gal. [l]
NOTE: All units have TXV expansion devices, and 1/2 in. [12.2 mm] and 3/4 in. [19.1 mm] electrical knockouts.
4
4/9/08
NDS INSTALLATION MANUAL
Physical Dimensions
Cabinet Dimensions and Refrigerant Piping Connections
Top View
B
Front View
Connection Point for Field Installed
Heat Recovery Unit
Rear View
WATER OUT
WATER IN
D
E
J
F
Suction Line
Connection
K
H
I
G
L
Lineset connections are braze type
internally mounted
Liquid Line
Connection
Side View
Side View
A
C
M
Model
A
B
C
D
E
F
G
H
I
J
K
L
M
36.0
23.9
25.7
9.3
7.1
9.0
5.6
8.2
10.7
18.9
8.7
14.8
7.0
[91.4]
[60.7]
[65.2]
[23.7]
[18.0]
[22.8]
[14.2]
[20.9]
[27.2]
[48.0]
[22.1]
[37.6]
[17.8]
026 thru 072
Notes: Refer to Physical Dimensions and Piping Connections drawings
Inches [cm]
5
NDS INSTALLATION MANUAL
General Installation Information
Safety Considerations
Condensate Drain
Follow the blower coil manufacturer’s instructions.
WARNING: Before performing service or
maintenance operations on a system, turn off main
power switches to both units. Turn off accessory
heater power switch if applicable. Electrical
shock could cause personal injury. Installing and
servicing heating and air conditioning equipment
can be hazardous due to system pressure and
electrical components. Only trained and qualified
service personnel should install, repair or service
heating and air conditioning equipment.
Duct System
All blower coil units/air coils must be installed as specified
by the manufacturer’s installation instructions; however, the
following recommendations should considered to minimize
noise and service problems.
An air filter 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 filter rack for normal maintenance, it
is suggested that a return air filter grill be installed. Be sure
that the return duct is properly installed and free of leaks
to prevent dirt and debris from bypassing the filter and
plugging the air coil.
Installing and servicing heating and air conditioning
equipment can be hazardous due to system pressure and
electrical components. Only trained and qualified 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 filters. 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 fire extinguisher available for all brazing
operations.
In applications using galvanized metal ductwork, a flexible
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 fiber 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 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 airflow quietly. If air noise or excessive airflow
is a problem, the blower speed can be changed to a lower
speed to reduce airflow. This will reduce the performance
of the unit slightly in heating; however, it will increase the
temperature rise across the air coil. Airflow must still meet
minimum requirements.
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.
Equipment Selection
Split Unit Location
The following guidelines should be used when mating an
Envision Split to an air handler/coil.
• Select R-410A components only.
• Match the air handler to the air handler coil data table.
• Indoor matching adjustable TXV is factory installed on
every NAH air handler/coil. Fixed orifice or cap tube
systems should not be used.
• Minimum of two (2) blower speeds
Locate the split compressor section away from areas that
may disturb the customer and in a way that allows easy
removal of the access panels and the top of the cabinet.
Provide sufficient room to make water, electrical and
refrigerant line connections and allow space for service
personnel to perform maintenance. The NDS split is
approved for outdoor installation when properly installed.
Air Coil Location
Utilizing Existing Coil or Air Handler
Refer to the air handler manufacturer’s instructions for the
blower coil unit for details on installing the air handling
portion of the system.
It is recommended that a new R-410A air handler be
installed with an Envision Split considering the long term
6
NDS INSTALLATION MANUAL
General Installation Information cont.
benefits 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 fixed orifice systems
should be used
• A life expectancy of more than 7 years remaining for the
air handler and components
• Flush air coil and line set
An air filter 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 filter rack for normal maintenance, it is
suggested that a return air filter grille be installed. Be sure
that the return duct is properly installed and free of leaks
to prevent dirt and debris from bypassing the filter and
plugging the air coil.
Ensure that the line set size is appropriate to the capacity
of the unit (refer to Line Set Sizes table). Line sets should
be routed as directly 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, floor joists, wall studs, duct work, floors,
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.
When utilizing the existing air coil or line set, only flushing
compounds that vaporize should be used; which means
they are packaged in a pressurized disposable cylinder. It is
preferable to use a flushing agent that removes oil, water,
and acid, plus, is biodegradeable and non-toxic. The flushing
agent should be safe to use with both HCFC and HFC
refrigerants. Once a flushing agent has been selected, follow
the instructions provided with the product.
The first step should be purging the lines or air coil with
nitrogen. Purging with nitrogen first will remove some of
the particulate and residual oil which will allow the flushing
agent to work better. Never blow the flushing agent
through a compressor, filter drier, or txv as it will cause the
components to fail.
Note: Improper installation of equipment may result in
undesirable noise levels in the living areas.
When flushing is complete and the final system is assembled,
an acid check should be preformed on the system. Acid test
kits are available from most HVACR distributors.
Typical Split System Application Remote Blower Coil
Connection to Air Coil
Supply
Duct
Typical Split System Application - Remote Blower Coil
and Typical Split System Heat Pump Coil Add-on Fossil
Fuel Furnace illustrations show typical Envision Split
installations. The Line Set Sizes table shows typical line
set diameters and maximum length. Line sets over 60 feet
are not recommended. If the line set is kinked or deformed
and cannot be reformed, the bad section of pipe should be
replaced. A restricted line set will affect unit performance.
As in all R-410A equipment, a reversible liquid line filter
drier is required to ensure all moisture is removed from the
system. This drier should be replaced whenever “breaking
into” the system for service. All line sets 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 ensure long insulation life.
Disconnect
Low
Voltage Wire
Air
Handler
Insulated
Suction Line
Lineset
To Air Handler
Return
Duct
Condensate Drain
(must be trapped)
Air Handler Installation
Remote Air Handler
(Maximum Recommended Distance is
60' Between Units)
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 specified
by the manufacturer’s installations instructions. However,
the following recommendations should be considered to
minimize noise and service problems.
7
NDS INSTALLATION MANUAL
General Installation Information cont.
Dual Fuel Systems
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
the Thermostat Wiring section for details.
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 or a field-installed
DPST relay is required. See the Typical Split System Heat
Pump Coil Add-on Fossil Fuel Furnace illustration for
typical Dual Fuel application.
Typical Split System Heat Pump Coil
Add-on Fossil Fuel Furnace
Disconnect
Supply Duct
"A" or
Slab Coil
Insulated
Suction Line
Wire To
Thermostat
Condensate
Drain
(must be trapped)
Lineset To Air Handler
Return
Duct
Thermostat
Wire From Furnace
8
Up-Flow
Fossil Fuel
Furnace
NDS INSTALLATION MANUAL
Electrical Data
General
Be sure the available power is the same voltage and phase
as that shown on the unit serial plate. Line and low voltage
wiring must be done in accordance with local codes or the
National Electric Code, whichever is applicable. See unit
electrical data for fuse or cicuit breaker sizing information.
Rated
Voltage
Model
Voltage
Min/Max
Compressor
MCC
RLA
LRA
LRA*
HWA
Pump
FLA
Ext
Loop
FLA
Total
Unit
FLA
Min
Circ
Amp
Max
Fuse/
HACR
026
208-230/60/1
197/253
16.0
10.2
52.0
18.0
0.4
5.4
16.0
18.6
25
038
208-230/60/1
197/253
26.0
16.6
82.0
29.0
0.4
5.4
22.4
26.6
40
049
208-230/60/1
197/253
33.0
21.1
96.0
34.0
0.4
5.4
26.9
32.2
50
064
208-230/60/1
197/253
40.0
25.6
118.0
41.0
0.4
5.4
31.4
37.8
60
072
208-230/60/1
197/253
42.5
27.2
150.0
53.0
0.4
5.4
33.0
39.8
60
05/06/09
Rated voltage of 208-230/60/1.
HACR circuit breaker in USA only.
Min/Max voltage of 197/253.
All fuses Class RK-5
* With optional IntelliStart
Thermostat Wiring
Thermostat Wiring for Dual Fuel Applications
Thermostat Wiring
Typical EZ Wiring Diagram
Y1
1st Stage Compressor
Envision Split
Thermostat
Envision Split
Thermostat
Y1
Y1
Y2
Y2
2nd Stage Compressor
1st Stage Compressor
Y1
2nd Stage Compressor
Y2
Y2
O
O
Reversing Valve
O
L
Air Handler
Fossil Fuel
Furnace
P1
Fault Signal
L
Reversing Valve
O
P1
Fault Signal
LO
Lo
C
Common
C
C
Common
Common
C
Common
C
C
R
24 VAC
R
R
24 VAC
R
W
24 VAC
R
24 VAC
R
W
W
Auxiliary Heat Relay
G
G
Fan
G
Fan
Shut
P2
G
W
Down
Auxiliary
Heat Relay
Auxiliary Heat Relay
Air Handler transformer must be at least 75 VA.
Note: Field installed DPST dual fuel relay
(Required for dual fuel installation)
or use TP32U03 or TP32U04
9
= chassis
NDS INSTALLATION MANUAL
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 qualified service mechanic, as special solutions and
pumping equipment are required. Hot water generator coils
Material
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 flushing.
Units with cupronickel heat exchangers are recommended
for open loop applications due to the increased resistance
to build-up and corrosion, along with reduced wear caused
by acid cleaning.
Copper
90/10 Cupro-Nickel
pH
Acidity/Alkalinity
7- 9
7-9
7-9
Scaling
Calcium and Magnesium Carbonate
(Total Hardness) less than 350 ppm
(Total Hardness) less than 350 ppm
(Total Hardness) less than 350 ppm
Hydrogen Sulfide
Less than .5 ppm (rotten egg smell
appears at 0.5 PPM)
10 - 50 ppm
Less than 1 ppm
Less than 200 ppm
Sulfates
Less than 125 ppm
Less than 125 ppm
Chlorine
Less than .5 ppm
Less than .5 ppm
Less than .5 ppm
Chlorides
Less than 20 ppm
Less than125 ppm
Less than 300 ppm
Carbon Dioxide
Less than 50 ppm
10 - 50 ppm
10- 50 ppm
Ammonia
Less than 2 ppm
Less than 2 ppm
Less than 20 ppm
Ammonia Chloride
Less than .5 ppm
Less than .5 ppm
Less than .5 ppm
Ammonia Nitrate
Less than .5 ppm
Less than .5 ppm
Less than .5 ppm
Ammonia Hydroxide
Less than .5 ppm
Less than .5 ppm
Less than .5 ppm
Ammonia Sulfate
Less than .5 ppm
Less than .5 ppm
Less than .5 ppm
Total Dissolved Solids (TDS)
Less than 1000 ppm
1000-1500 ppm
1000-1500 ppm
LSI Index
+0.5 to -.05
+0.5 to -.05
+0.5 to -.05
< .2 ppm
< .2 ppm
< .2 ppm
Less than 1 ppm. Above this level
deposition will occur.
Less than 1 ppm. Above this level
deposition will occur.
Corrosion
Iron, Fe2+ (Ferrous)
Bacterial Iron Potential
Iron Fouling
(Biological Growth)
Iron Oxide
Suspended Solids
Erosion
Threshold Velocity (Fresh Water)
Grains = PPM divided by 17
316 Stainless Steel
•
Less than 1 ppm. Above this level
deposition will occur.
Less than 10 ppm and filtered for max of Less than 10 ppm and filtered for max of Less than 10 ppm and filtered for max of
600 micron size
600 micron size
600 micron size
< 6 ft/sec
< 6 ft/sec
mg/l is equivalent to PPM
< 6 ft/sec
2/8/08
10
NDS INSTALLATION MANUAL
Water Piping
Flow Center Installation
Residential NDS split units are supplied standard with
GeoLink swivel connections with P.T. ports.
Flow centers FC1-GL or FC2-GL, as needed, may be
internally mounted on the NDS splits, Two stub tubes with
barbs are pre connected to the coax. Two tubes with brass
fittings, to adapt to the flow center, 2 hoses to connect
between the two sets of tubes, and four hose clamps are
included with each NDS unit. The brass adapter fittings
have plastic swivel connectors and are also internally
threaded to accept 3/4 in. NPT fittings.
CAUTION: Water piping exposed to outside
temperatures may be subject to freezing.
Water Piping
The proper water flow must be provided to each unit
whenever the unit operates. To assure proper flow, use
pressure/temperature ports to determine the flow rate.
These ports should be located at the supply and return
water connections on the unit. The proper flow rate cannot
be accurately set without measuring the water pressure
drop through the refrigerant-to-water heat exchanger.
NOTE: For ease of installation, attach provided hoses to
coax first and then trim to fit to elbows on flow center.
Typical Split System Outdoor Installation
Using Closed Loop
Closed Loop - Earth coupled Systems
(Outdoor Installations)
Locate unit on an air pad with access hole as shown below.
When mounting on an existing concrete pad, holes must
be bored through to accommodate 1 1/4-inch P.E. pipe with
1/2-inch insulation.
Connecting To Earth Loop
The earth loop trench should be continued directly under
the unit as shown in the Typical Split System Outdoor
Installation Using Closed Loop. Make the connections to
optional fittings from the loop circulator pump(s) and
ensure proper backfill to support the loop pipe during
trench settling. All 1 1/4-inch piping should be insulated
with a minimum of 1/2-inch closed cell insulation from
below the ground surface to the loop circulator.
IMPORTANT: A freeze detection thermostat is
installed in the unit to automatically start loop
circulator pump if loop temperature drops
below 20°F. Loop freeze detection should also
be maintained to the lowest temperature the
insulated loop may encounter in the case of
power failure.
Loop Supply
and Return
Piping
Open Loop (Indoor Installations)
NDS Splits can be installed on an open loop system, but
only indoors. All NDS Splits are supplied with GeoLink
swivel connectors. The swivel connectors that are supplied
with the NDS Split also accept 3/4 in. NPT pipe which can
be connected in an open loop system.
11
NDS INSTALLATION MANUAL
Model Nomenclature - Air Handler
1-3
4-6
7
8-9
10
11
12
NAH
036
A
00
0
1
R
Model Type
NAH = Envision Series Air Handler
Air Coil
R = Refrigerant
H = Hydronic
Unit Capacity
Refrigerant Models Nom. CFM
022 MBTUH
800
026 MBTUH
925
030 MBTUH
980
036 MBTUH
1225
042 MBTUH
1425
048 MBTUH
1625
060 MBTUH
1760
Hydronic Models
026 MBTUH
925
036 MBTUH
1225
048 MBTUH
1625
060 MBTUH
1760
Motor
1 = ECM 208-230/60/1
Disconnect
0 = No breaker installed
(only on 5kW & 10kW heaters)
1 = Breaker installed
(only on 15kW & 20kW heaters)
Electric Heat
00 = No electric heat
05 = 5 kW (available on 022-036 only)
10 = 10 kW (available on 030-060 only)
15 = 15 kW (available on 042-060 only)
20 = 20 kW (available on 060 only)
Vintage
A = Current
NOTE: Kit NAHBC must be ordered to field convert the NAH042-060 to bottomflow air discharge.
Coil Data - Air Handler
Envision Split Model
Matching Air Handler
Coil Surface Area (ft2)
FPI
Rows
Tube Diameter
022 - 038
NAH036
5.83
042 - 072
NAH060
5.83
12
2
3/8 in.
12
3
3/8 in.
Compatibilty Table - Air Handler
Air Handler
Indoor Split Model
(Single)
Indoor Split Model
(Dual Capacity)
NAH022A***1R
NSZ022
-
Outdoor Split Model
(Dual Capacity)
Airflow(CFM)
Electric Heat (kW)
800
5
NAH026A***1R
-
NDZ026
NDS026
925
5
NAH030A***1R
NSZ030
-
-
980
5, 10
NAH036A***1R
NSZ036
-
-
1225
5, 10
NAH036A***1R
-
NDZ038
NDS038
1225
5, 10
NAH042A***1R
NSZ042
-
-
1425
10, 15
NAH048A***1R
NSZ048
-
-
1625
10, 15
NAH048A***1R
-
NDZ049
NDS049
1625
10, 15
NAH060A***1R
NSZ060
-
-
1760
10, 15, 20
NAH060A***1R
-
NDZ064
NDS064
1760
10, 15, 20
NAH060A***1R
NSZ070
-
-
1760
10, 15, 20
NAH060A***1R
-
NDZ072
NDS072
1760
10, 15, 20
6/9/08
12
NDS INSTALLATION MANUAL
Physical Data - Air Handler
Air Handler Model Number (Refrigerant)
NAH022 NAH026 NAH030 NAH036 NAH042 NAH048 NAH060
Air Coil Total Face Area, ft2 [m2]
5.83 [0.54]
Tube outside diameter - in. [mm]
Evaporator
Coil
3/8 [9.52]
Number of rows
2
3
Fins per inch
12
Suction line connection - in. [mm] sweat
5/8 [15.87]
7/8 [22.22]
3/8 [9.52]
Liquid line connection - in. [mm] sweat
Refrigerant
R-410a
Nominal cooling capacity - tons [kW]
1.8 [6.44]
2.1 [7.59]
2.5 [8.79]
3 [10.55] 3.5 [12.30] 4 [14.06]
5 [17.58]
3/4 [19.05]
Condensate drain connection - (FPT) in. [mm]
Blower Wheel Size (Dia x W), in. [mm]
11 x 10 [279 x 254]
Blower motor type/speeds
ECM variable speed
1/2 [373]
Blower motor output - hp [W]
1 [746]
20 x 24 [508 x 635]
Filter Standard - 1" [51mm] MERV3 disposable, in. [mm]
208/230 - 1ph
Electrical characteristics (60hz)
215 [97.52]
195 [88.45]
Shipping weight - lbs. [kg]
Operating weight - lbs. [kg]
220 [99.79]
200 [90.71]
1/11/08
Air Handler Model Number (Hydronic)
Hydronic
Coil
NAH026 NAH036 NAH048 NAH060
Air Coil Total Face Area, ft2 [m2]
6.94 [0.64]
Tube outside diameter - in. [mm]
3/8 [9.52]
Number of rows
3
Fins per inch
13
7/8 [22.22]
7/8 [22.22]
Water In connection - in. [mm] sweat
Water Out connection - in. [mm] sweat
Nominal cooling capacity - tons [kW]
2.1 [7.59]
3 [10.55]
4 [14.06]
Blower Wheel Size (Dia x W), in. [mm]
11 x 10 [279 x 254]
Blower motor type/speeds
ECM variable speed
Blower motor output - hp [W]
5 [17.58]
3/4 [19.05]
Condensate drain connection - (FPT) in. [mm]
1/2 [373]
1 [746]
20 x 24 [508 x 635]
Filter Standard - 1" [51mm] MERV3 disposable, in. [mm]
208/230 - 1ph
Electrical characteristics (60hz)
220 [99.79]
200 [90.71]
Shipping weight - lbs. [kg]
Operating weight - lbs. [kg]
3/11/08
NOTE: Water connection dimensions are O.D.
13
NDS INSTALLATION MANUAL
Model Nomenclature - Envision Coil
1-2
NR
3
A
4
C
5-7
026
8
C
Cabinet
C = Encased
U = Uncased
Model Type
NR = Envision Refrigerant Coil
NH = Envision Hydronic Coil
Capacity
Refrigerant Models
026 MBTUH
036 MBTUH
048 MBTUH
060 MBTUH
Hydronic Models
060 MBTUH
Configuration
A = "A" Coil
Coil
NOTE: All Refrigerant Coils include TXV.
Refrigerant Coil Compatibility
Encased/Uncased Coil
NRAC026*
NRAC026*
NRAC026*
NRAC036*
NRAC036*
NRAC048*
NRAC048*
NRAC048*
NRAC060*
NRAC060*
NRAC060*
NRAC060*
Indoor Split Model
(Single)
NSZ022
NSZ030
NSZ036
NSZ042
NSZ048
NSZ060
NSZ070
-
Indoor Split Model
(Dual Capacity)
NDZ026
NDZ038
NDZ049
NDZ064
NDZ072
14
Outdoor Split Model
(Dual Capacity)
NDS026
NDS038
NDS049
NDS064
NDS072
Recommended Airflow
(CFM)
800
925
980
1225
1225
1425
1625
1625
1760
1760
1760
1760
7/14/08
NDS INSTALLATION MANUAL
Heat Recovery Unit for Domestic Hot Water
Service valves have been provided inside the unit for
connecting the discharge gas line to a water heating heat
recovery unit (see Service Valves for Heat Recovery Unit
Connections illustration). To make the connections, close
the service valves inside the unit by turning clockwise.
Using a recovery canister connect to either of the schrader
ports on the DSH service valves and recover the small
amount of refrigerant trapped inside of the U-tube. Prior
to brazing ensure that all refrigerant has been removed
from U-tube. Once the refrigerant is removed, it is
recommended that the tube be cut at the “U” to remove
any excess oil that may be trapped. (This will also allow
for easier removal of the tubing with a torch, since each
section can be removed independently). Service valves
must be protected to prevent overheating. Unbraze the
1/2-inch O.D. U-tube and run tubing from the left hand
service valve to the inlet of the heat recovery unit and
from the outlet of the heat recovery unit to the right hand
of the service valve. Typically the one way discharge line
length should be limited to 25-30 feet and line size must be
increased depending on unit size and length of run. Follow
the instructions supplied with the heat recovery unit for
mounting location, water piping, and start up. A typical
installation is shown below.
IMPORTANT: Reopen discharge line service
valves before starting up unit, but only after leak
checking, purging, and evacuating new discharge
line.
Maximum One-Way Line Length
Service Valves for Heat Recovery Unit Connections
To
Compressor
Heat Recovery
Unit “In”
From
Heat Recovery
Unit “Out” to
Reversing
Valve
SIZE
1/2” OD
5/8” OD
3/4” OD
026 - 038
Up to 9 ft.
Up to 25 ft.
Up to 30 ft.
049
Up to 5 ft.
Up to 13 ft.
Up to 30 ft.
064
N/A
Up to 9 ft.
Up to 25 ft.
072
N/A
Up to 6 ft.
Up to 20 ft.
Typical Hot Water Piping Layout
Cold
Line set
To Hot Water
Generator
Hot
Venting
Waste Valve or
Vent Coupling
P/T Relief
Valve
Insulated Line set
With UV Paint
To Air handler
Add-on
Hot Water
Generator with
Internal Pump
15
Drain Valve
Pipe Tee
NDS INSTALLATION MANUAL
Wiring Schematics
Dual Capacity Split Wiring Schematic - 208-230/60/1
S
C
R
Loop Pump(s)
1/2 HP 208-230/60/1
Blue
Gray(9)
Red
Pump
Pump
G
G
L2
CS
+
-
CC
Tan (16)
Run
Capacitor
Heat
Recovery
Unit
DC SOL
Comfort Alert
Unit Power
208-230/60/1
Yellow (8)
1 - Connection of remo
for slave operation.
2 - 24V Accessory rela
3 - Field installed DPD
installation)
4 - DHW pump only in
5 - Comfort Alert fault
6 - This Switch allows
when OFF and finis
second stage reduc
compressors and s
E-Series or Premie
Black
L2
L1
L1
FP
Red (11)
Green /Yellow
Crankcase Heater
NO
COM
CR1
NC
CR3
COM
NC
F1-10A 240V
Wire n
COM
CR4
Groun
Relay
N.O.,
Fuse
R
Black (5)
P6
8
CCHI
Violet (2)
CC
13
Black (1)
CC-GND
P1
1
R
7
C
2
Y1
3
Y2
4
W
5
O
6
G
7
LO
8
4
5
14
12
Microprocessor
Logic Control
(DC Voltage)
6
15
10
9
2
Crank
1
C
11
22
C
C
SL1 In
33
4
SL1 Out
5
Not
6
Used
7
SL1 In
Acc NC
2
Acc NO
3
1
2
3
SW2
1
2
3
4
5
6
7
8
9
10
11
12
SW3
On
1 Test / Norm
2 Loop / Well
3 Fan / Comp
4 Not Used
5 Not Used
6 Inputs / Norm
7 Outputs / Norm
8 Pulse L / Constant L
11
On
1 Dual/ Single Capacity
2 Normal/ Finish on 2nd NOTE 6
3 No RPM / RPM
4 Must be On
5 Envision / E Series or Premier
P4
R
R
G
Y
R
SW4
Tan
L
Comfort Alert
LED
Normal Display Mode
Field Selection Dips - #1 On, #6 On, #7 On
Not Used
Drain
FD thermistor(loop<15 °F,well <30°F) Lockout
Water Flow
High Pressure
High Press
Low Press /CA Low Pressure / Comfort Alert
Not Used
Air Flow
Microprocessor malfunction*
Status
Not Used
DHW Limit
Not Used
DHW off
*Green LED not flashing
16
Current Fault Status
#1 Off, #6 On, #7 On
Not Used
FD thermistor (loop <15°F, well <30°F)
High Pressure
Low Pressure / Comfort Alert
Not Used
Not Used
Not Used
Not Used
Switch
4
9
Orange
2
Orange
10
Not Used
3
8
Not Used
RV
Switc
P
Not Used
1
Not Used
12
Yellow
5
Yellow
13
Blue
6
Blue
7
Black
14
Black
T
LP
HP
Diagnostic Modes
R
R
R
Capac
NOTE 5
Inputs
Outputs
#6 Off, #7 On
Y1
Y2
O
Not Used
Not Used
SL1
SL2
Not Used
#6 On, #7 Off
Lo Capacity Compressor
Hi Capacity Compressor
RV
FAN
Not Used
Loop Pump1
Loop Pump2
Not Used
Outputs2
#6 Off, #7 Off
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
FD
1
1
Relay
P5
3
Acc Com
16
2
NOTE 2
P3
Status LED PCB
SL1 Out
Optional
Remote Unit
Without
Loop Pump
Light
G
11
ECM2
Air Flow
Settings
SW1 On
NOT USED
NOTE 1
Therm
T
3
P2
Shut
Down
Comf
Comp
Comp
Not U
Loop
Loop
Not U
Fuses
Freez
High P
Low P
Rever
Not U
DIP P
DIP P
CA CS CC CR1 CR2CR3 CR4 F1 and F2 FD HP LP RV SW1 SW2 SW3 -
C
White (4)
CC
Field w
L1
Fused L1
Black (7)
Yellow (6)
Violet (3)
240V L1
NO
NOT USED
R
Comfort C
Alert Y2Y
COM
CR2
240V L2
Fused L2
NO
Facto
Facto
Field l
Field l
Option
DC Vo
Intern
Quick
Black
F1-10A 240V
NO
Brown (15)
Orange (14 )
Black
Fused L2
Lege
Red (12)
Polari
NDS INSTALLATION MANUAL
Wiring Schematics cont.
Dual Capacity Split Wiring Schematic - 208-230/60/1 cont.
F1
F1
N.C.
N.O.
N.O.
N.O .
N.O.
Com
CR2- Loop
Pump
CR1- DHW
Pump
Com
CR3-
CR49
CC-GND
CC
CCLO
CCHI
Factory Low voltage wiring
Factory Line voltage wiring
Field low voltage wiring
Field line voltage wiring
Optional block
DC Voltage PCB traces
Internal junction
Quick connect terminal
Wire nut
Field wire lug
L1
Ground
10
11
12
13
14
15
Microprocessor
Legend
SW1
Off On
C
C
R
R
P4
1 2 3
1
2
3
P1
4
5
240V - L2
240V - L2
Fused L2
Fused L2
Fused L2
Fused L2
Fused L1
240V - L1
1 - Connection of remote unit that does not have a loop pump
for slave operation.
2 - 24V Accessory relay (see SW2 -3 for description of operation)
3 - Field installed DPDT dual fuel relay. (Required for dual fuel
installation)
4 - DHW pump only in models with hot water generation option.
5 - Comfort Alert fault output to Premier Control Board
6 - This Switch allows the unit to down stage with the t-stat
when OFF and finish on second stage when ON. Finish
second stage reduces stage changing in recip dual capacity
compressors and should be ON for unzoned Dual Cap
E-Series or Premier 2 speed units.
240V - L1
Logic Board - Physical Layout
Notes
6
1
2
3
4
5
6
7
8
9
10
11
12
7
8
R C Y1 Y2 W O G L
SW2
Off On
SW3
Off On
1
2
3
4
5
6
7
8
P2
1
2
3
Shut
Down
C
C
1
2
3
4
5
4
5
SL1
IN
SL 1 SL 2
Out
IN
6
7
1
SL 2
Out
ACC
NO
1
2
3
4
5
6
7
16
8
8
1
9
2
10
3
11
4
12
5
13
6
14
7
P3
2
P6
P5
3
ACC ACC
NC COM
Relay Contacts N.O., N.C.
Fuse
Comfort Alert
Compressor Solenoid
Compressor Contactor
Not Used
Loop Pump Relay1
Loop Pump Relay2
Not Used
Fuses
Freeze Detection sensor
High Pressure Switch
Low Pressure Switch
Reversing Valve Coil
Not Used
DIP Package 8 Position
DIP Package 5 Position
CA CS CC CR1 CR2CR3 CR4 F1 and F2 FD HP LP RV SW1 SW2 SW3 -
Comfort Alert
Physical Layout
POWER
Y2
Y
Data
Port
L
R
Crankcase Heater
C
Thermistor
T
DC
Sol
Light Emitting Diode - Green
G
ALERT
TRIP
Relay Coil
Capacitor w/ Bleed Resistor
E5
Comfort Alert
Switch-High Pressure
RV
Switch-Low Pressure
1
FD
3
T
2
P
Polarized Connector
LED Flash Code
Green
Solid
Red
Solid
Code 1
Code 2
Code 3
Code 4
Yellow
Code 5
Code 6
Code 7
Code 8
Code 9
Comfort Alert Status
Description
Module Has Power
Y1 Present But Compressor Not Running
Long Run Time
System Pressure Trip
Short Cycling
Locked Rotor
Open Circuit
Open Start Circuit
Open Run Circuit
Welded Contactor
Low Voltage
LP
HP
Outputs2
#6 Off, #7 Off
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
97P788-01
17
4/19/10
NDS INSTALLATION MANUAL
Wiring Schematics cont.
Dual Capacity Split with IntelliStart Wiring Schematic - 208-230/60/1
S
C
Blue
PB2
2
R
Black
Loop Pump(s)
1/2 HP 208-230/60/1
Pump
Pump
Heat
Recovery
Unit
Tan (16)
G
L2
Pink
Blue
CC
Run
Capacitor
L2
Black
T1
T2
Red
CS
+
-
Red
Unit Power
208-230/60/1
Yellow (8)
G
1
DC SOL
Comfort Alert
Gray(9)
Leg
L1
L1
Fa
Fa
Fi
Fi
Op
DC
In
Qu
FP
Red (11)
Red (12)
Green /Yellow
Crankcase Heater
Brown (15)
Orange (14 )
Black
W
Black
Fi
L1
NO
NO
COM
CR1
COM
CR3
NC
COM
Violet (3)
NO
NC
Re
N.
F1-10A 240V
Fu
COM
CR4
R
Black (5)
C
White (4)
CC
CA CS CC CR1 CR2CR3 CR4 F1 and F2 FP HP LP RV SW1 SW2 SW3 -
Fused L1
Black (7)
Yellow (6)
Gr
240V L1
P6
8
CCHI
Violet (2)
CC
13
Black (1)
CC-GND
P1
1
R
7
C
2
Y1
3
Y2
4
W
5
O
6
G
7
LO
8
Co
Co
Co
No
Lo
Lo
No
Fu
Fr
Hi
Lo
Re
No
DI
DI
4
5
14
12
Microprocessor
Logic Control
(DC Voltage)
6
15
10
9
2
NOT USED
R
Cr
T
Th
G
Lig
Re
Ca
1
3
33
4
SL1 Out
SL1 Out
5
Optional
Remote Unit
Without
Loop Pump
Not
6
Used
7
ECM 2
Air Flow
Settings
SW1 On
NOTE 2
P3
Acc Com
1
Acc NC
2
Acc NO
3
1
2
3
P5
SW2
1
2
3
4
5
6
7
8
9
10
11
12
SW3
On
1 Test / Norm
2 Loop / Well
3 Fan / Comp
4 Not Used
5 Not Used
6 Inputs / Norm
7 Outputs / Norm
8 Pulse L / Constant L
R
R
G
Y
R
SW4
NOTE 5
11
On
1 Dual/ Single Capacity
2 Normal/Finish on2nd NOTE 6
3 No RPM / RPM
4 Must be On
5 Envision / E Series or Premier
P4
Tan
L
LED
Drain
Water Flow
High Press
Low Press/CA
Air Flow
Status
DHW Limit
DHW off
Normal Display Mode
Field Selection Dips - #1 On, #6 On, #7 On
Not Used
FD thermistor (loop<15 °F,well <30°F) Lockout
High Pressure
Low Pressure / Comfort Alert
Not Used
Microprocessor malfunction*
Not Used
Not Used
*Green LED not flashing
18
Current Fault Status
#1 Off, #6 On, #7 On
Not Used
FD thermistor (loop <15°F, well <30°F)
High Pressure
Low Pressure / Comfort Alert
Not Used
Not Used
Not Used
Not Used
P
Comfort Alert
Po
4
9
Orange
2
Orange
10
Not Used
3
8
Not Used
1
Not Used
12
Yellow
5
Yellow
13
Blue
RV
Not Used
6
Blue
7
Black
14
Black
T
Inputs
Outputs
#6 Off, #7 On
Y1
Y2
O
Not Used
Not Used
SL1
SL2
Not Used
#6 On, #7 Off
Lo Capacity Compressor
Hi Capacity Compressor
RV
FAN
Not Used
Loop Pump1
Loop Pump2
Not Used
FD
LP
HP
Diagnostic Modes
R
R
R
Sw
1
SL1 In
C
SL1 In
16
3
C
C
Sw
11
2
NOTE 1
11
22
NOT USED
P2
Shut
Down
Status LED PCB
Comfort C
Alert Y2Y
NO
CR2
240V L2
Fused L2
F1-10A 240V
Fused L2
Outputs2
#6 Off, #7 Off
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
1 - Connection
for slave op
2 - 24V Access
3 - Field install
installation)
4 - DHW pump
5 - Comfort Ale
6 - This Switch
when OFF
second sta
compresso
Series or P
NDS INSTALLATION MANUAL
Wiring Schematics cont.
Dual Capacity Split with IntelliStart Wiring Schematic - 208-230/60/1 cont.
Run Winding
Pink
Active
Blue
Start
Black
N.C.
N.O.
N.O.
N.O.
Com
CR2- Loop
Pump
CR1- DHW
Pump
9
SW1
Off On
C
C
R
R
Field wire lug
Ground
Relay Contacts N.O., N.C.
P4
Comfort Alert
Compressor Solenoid
Compressor Contactor
Not Used
Loop Pump Relay 1
Loop Pump Relay 2
Not Used
Fuses
Freeze Detection sensor
High Pressure Switch
Low Pressure Switch
Reversing Valve Coil
Not Used
DIP Package 8 Position
DIP Package 5 Position
CR4-
1 2 3
1
2
3
P1
4
5
6
1
2
3
4
5
6
7
8
9
10
11
12
7
8
R C Y1 Y2 W O G L
SW2
Off On
SW3
Off On
1
2
3
4
5
6
7
8
P2
1
2
3
Shut
Down
C
C
1
2
3
4
5
6
7
16
8
8
1
9
2
10
3
11
4
12
5
13
6
14
7
P3
10
11
12
13
14
15
Microprocessor
Wire nut
Fuse
Com
CR3-
CC-GND
CC
CCLO
CCHI
Factory Low voltage wiring
Factory Line voltage wiring
Field low voltage wiring
Field line voltage wiring
Optional block
DC Voltage PCB traces
Internal junction
Quick connect terminal
240V - L2
F1
N.O .
Legend
CA CS CC CR1 CR2CR3 CR4 F1 and F2 FP HP LP RV SW1 SW2 SW3 -
240V - L2
Fused L2
F1
IntelliStart
Common
L1
Fused L2
Fused L2
Fused L2
Red
240V - L1
240V - L1
1
Fused L1
Logic Board - Physical Layout
PB2
2
1
2
3
4
5
4
5
SL1
IN
SL 1 SL 2
Out
IN
6
7
1
SL 2
Out
ACC
NO
2
P6
P5
3
ACC ACC
NC COM
Comfort Alert
Physical Layout
POWER
Y2
Y
Data
Port
Crankcase Heater
L
R
T
Thermistor
G
Light Emitting Diode-Green
C
DC
Sol
Relay Coil
ALERT
TRIP
Capacitor w/ Bleed Resistor
Switch- High Pressure
Switch- Low Pressure
1
P
Comfort Alert
3
L
2
NOTE 5
Polarized Connector
RV
T
LED Flash Code
Green
Solid
Red
Solid
Code 1
Code 2
Code 3
Code 4
Yellow
Code 5
Code 6
Code 7
Code 8
Code 9
Comfort Alert Status
Description
Module Has Power
Y1 Present But Compressor Not Running
Long Run Time
System Pressure Trip
Short Cycling
Locked Rotor
Open Circuit
Open Start Circuit
Open Run Circuit
Welded Contactor
Low Voltage
FD
LP
HP
Outputs2
#6 Off, #7 Off
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Notes
1 - Connection of remote unit that does not have a loop pump
for slave operation.
2 - 24V Accessory relay (see SW2 -3 for description of operation)
3 - Field installed DPDT dual fuel relay. (Required for dual fuel
installation)
4 - DHW pump only in models with hot water generation option.
5 - Comfort Alert fault output to Premier Control Board
6 - This Switch allows the unit to down stage with the t-stat
when OFF and finish on second stage when ON. Finish
second stage reduces stage changing in recip dual capacity
compressors and should be ON for unzoned Dual Cap E
Series or Premier 2 speed units.
Not Used
97P788-02
19
4/19/10
NDS INSTALLATION MANUAL
Microprocessor Control
Startup
Heating Operation
The unit will not operate until all the inputs and safety
controls are checked for normal conditions. At first powerup, a four-minute delay is employed before the compressor
is energized.
Heat, 1st Stage (Y1)
The blower motor is started on low speed immediately
(PSC ON), the loop pump is energized 5 seconds after the
“Y1” input is received, and the compressor is energized on
low capacity 10 seconds after the “Y1” input. The blower
is switched to medium speed 15 seconds after “Y1” input
(ECM only).
Component Sequencing Delays
Components are sequenced and delayed for optimum
space conditioning performance.
Heat, 2nd Stage (Y1,Y2) Dual Capacity Units
Accessory Relay
The second stage compressor will be activated 5 seconds
after receiving a “Y2” input as long as the minimum first
stage compressor run time of 1 minute has expired. The
ECM blower changes from medium to high speed 15
seconds after the “Y2” input.
An accessory relay on the control board allows for field
connection of solenoid valves, electronic air cleaners, etc.
The accessory relay has a normally open output and a
normally closed output.
The Comfort Alert will delay the second stage compressor until 5 seconds after it receives a “Y2” from the board.
Short Cycle Protection
The control employs a minimum “off” time of four minutes
to provide for short cycle protection of the compressor.
Heat, 3rd Stage (Y1,Y2,W) Dual Capacity Units
The 1st stage of resistance heat is energized 10 seconds
after “W” input, and with continuous 3rd stage demand,
the additional stages of resistance heat engage 90 seconds
after the first stage.
Shutdown Mode
A 24VAC common signal to the “shutdown” input on
the control board puts the unit into shutdown mode.
Compressor and blower operation are suspended.
Emergency Heat (W only)
Safety Controls
The blower is started on high speed, and the first stage of resistance heat is energized 10 seconds after the “W” input. Continuing demand will engage the additional stages of resistance heat 90 seconds after the first stage.
The Envision control receives separate signals for a high
pressure switch for safety, a low pressure switch to prevent
loss of charge damage, and a low suction temperature
thermistor for freeze detection. Upon a continuous
30-second measurement of the fault (immediate for
high pressure), compressor operation is suspended, the
appropriate lockout LED begins flashing. (Refer to the
“Fault Retry” section below.)
Cooling Operation
In all cooling operations, the reversing valve directly tracks the “O” input. Thus, anytime the “O” input is
present, the reversing valve will be energized.
Testing
Cool, 1st Stage (Y1,O)
The Envision control allows service personnel to shorten
most timing delays for faster diagnostics. (Refer to the
Field Selection DIP switch table.)
The blower motor is started immediately, the loop pump(s)
is energized 5 seconds after the “Y1” input is received.
The compressor will be energized (on low capacity for
Dual Capacity units) 10 seconds after the “Y1” input.
The ECM blower will shift from low to medium speed 15
seconds after the “Y1” input (85% of medium speed if in
dehumidification mode).
Fault Retry
All faults are retried twice before finally locking the unit
out. An output signal is made available for a fault LED at
the thermostat. The “fault retry” feature is designed to
prevent nuisance service calls.
Cool, 2nd Stage (Y1, Y2, O) Single Speed Units
The blower changes to high speed (85% of high speed if
in dehumidification mode) 15 seconds after the “Y2” input
(ECM only).
Diagnostics
The Envision control board allows all inputs and outputs to
be displayed on the LEDs for fast and simple control board
diagnosis. (Refer to the Field Selection DIP Switch SW2-1
table.)
20
NDS INSTALLATION MANUAL
Microprocessor Control cont.
Cool, 2nd Stage (Y1, Y2, O) Dual Capacity Units
High Pressure
The second stage compressor will be activated 5 seconds
after receiving a “Y2” input as long as the minimum first
stage compressor run time of 1 minute has expired. The
ECM blower changes to high speed 15 seconds after the
“Y2” input (85% of high speed if in dehumidification mode).
The Comfort Alert will delay the second stage compressor
until 5 seconds after it receives a “Y2” from the board.
This lockout mode occurs when the normally closed safety
switch is opened momentarily (set at 600 PSI).
Low Pressure
This lockout mode occurs when the normally closed low
pressure switch is opened for 30 continuous seconds (set
at 40 PSI). A low pressure fault may also be indicated when
a Comfort Alert lockout has occurred.
Blower (G only)
The blower starts on low speed (PSC ON). Regardless of
blower input “G” from thermostat, the blower will remain
on low speed for 30 seconds at the end of each heating,
cooling or emergency heat cycle.
Freeze Detection (Water Flow)
This lockout mode occurs when the freeze detection
thermistor temperature is at or below the selected point
(well 30°F or loop 15°F) for 30 continuous seconds.
Lockout Conditions
During lockout mode, the appropriate unit and thermostat
lockout LEDs will illuminate. The compressor, loop pump,
and accessory outputs are de-energized. The blower will
continue to run on low speed. If the thermostat calls for
heating, emergency heat operation will occur.
Comfort Alert lockouts cannot be reset at the thermostat.
All other lockout modes can be reset at the thermostat
after turning the unit off, then on, which restores normal
operation but keeps the unit lockout LED illuminated.
Interruption of power to the unit will reset a lockout
without a waiting period and clear all lockout LEDs.
21
NDS INSTALLATION MANUAL
Microprocessor Control cont.
Compressor Monitoring/Comfort Alert
passive. All compressor alerts are displayed on the module
by flashing the yellow Alert LED a specific number of times
consecutively followed by a pause, and then repeated. The
number of consecutive flashes or “Flash Code” correlates
to a specific abnormal condition. The red “TRIP” LED
means there is a thermostat demand signal “Y” present but
the compressor is not running. The green “POWER” LED
means the module has power.
The Comfort Alert displays abnormal compressor
conditions through a unique flash code and communicates
the conditions to the heat pump microprocessor control.
The heat pump microprocessor will determine which fault
to act on and ignore. Fault codes 2 (system pressure),
4 (locked rotor), 6 (open start circuit), and 7 (open run
circuit) will result in a lockout. All other fault codes are
Green "POWER" LED - module has power
Red "TRIP" LED - Thermostat "Y" demand signal is present, but the compressor is not running.
Comfort Alert Flash Codes
Yellow "ALERT" LED
Flash Code 1
Flash Code 2
Flash Code 3
Flash Code 4
Flash Code 5
Flash Code 6
Flash Code 7
Flash Code 8
Flash Code 9
LED Description
Long Run Time
System Pressure Trip
Short Cycling
Locked Rotor
Open Circuit
Open Start Circuit
Open Run Circuit
Welded Contactor
Low Voltage
Cause
Eighteen consecutive hours of compressor run time
Not applicable
Compressor run time of less than 3 minutes on 4 consecutive cycles
Four consecutive compressor protector trips indicating compressor won't start
"Y" thermostat demand signal with no compressor current
"Y" thermostat demand signal with no current in the start circuit
"Y" thermostat demand signal with no current in the run circuit
Current detected with no "Y" thermostat demand signal present
Less than 17 VAC detected in control circuit
* Flash code number corresponds to a number of LED flashes, followed by a pause and then repeated.
* TRIP and ALERT LEDs flashing at the same time indicates control circuit voltage is too low for operation.
* Reset ALERT flash code by removing 24 VAC power from module.
* Last ALERT flash code is displayed for 1 minute after module is powered on.
Resetting Comfort Alert Codes
Alert codes can be reset manually by cycling power off and on to the Comfort Alert module. Alert codes will reset automatically if
conditions return to normal.
Flash Code Number
Flash Code 1
Flash Code 2
Flash Code 3
Flash Code 4
Flash Code 5
Flash Code 6
Flash Code 7
Flash Code 8
Flash Code 9
LED Description
Long Run Time
System Pressure Trip
Short Cycling
Locked Rotor
Open Circuit
Open Start Circuit
Open Run Circuit
Welded Contactor
Low Voltage
Automatic Reset of Alert Codes
Thirty "alert free" on and off cycles to reset automatically
Not applicable
Four "alert free" on and off cycles to reset automatically
Four "alert free" on and off cycles to reset automatically
One "alert free" on and off cycles to reset automatically
One "alert free" on and off cycles to reset automatically
One "alert free" on and off cycles to reset automatically
One "alert free" on and off cycles to reset automatically
Resets when voltage rises above 19 VAC
* Reset ALERT flash code by removing 24 VAC power from module.
22
NDS INSTALLATION MANUAL
Microprocessor Control cont.
Thermostat Displays
thermostat can be configured to show either lockout text
or lockout codes.
Fault Flash
When using a TA32W01 or TP32W02 thermostat and SW28 is in the pulsing “L” position, FaultFlash will enable a user
to view the thermostat and count the fault indicator flashes
to determine the lockout condition the unit is experiencing.
The LED board on the front of the unit will display all
lockouts. The Low Pressure LED will flash for a low pressure
condition or a Comfort Alert fault. If the low pressure
lockout was caused by Comfort Alert codes 4, 6 or 7, then
the Comfort Alert will be flashing. If no Comfort Alert code
is visible, then it is a low pressure lockout.
ComforTalk
When using a TP32U03, 04 or 05 thermostat and SW2-8
is in the pulsing “L” position, ComforTalk will enable the
user to view the thermostat and determine the fault. The
The following tables show the codes that will be displayed on the different ComforTalk and FaultFlash thermostats.
FaultFlash Thermostats
ComforTalk Thermostats
TA32W01 and TP32W02 Thermostats
Thermostat Display
Lockout Code
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes
10 Flashes
TP32U03, TP32U04 and TP32U05 Thermostats
Thermostat Display
Lockout Code
Lockout Description
High Pressure Fault
Low Pressure Fault
Not Applicable
Water Flow Fault
Not Applicable
Condensate Fault
Voltage out of Range
RPM Fault
Comfort Alert Compressor
Module Fault
Lockout code 10 - see Comfort Alert module to determine the specific flash code for
compressor abnormalities.
"High Pressure" or "E2"
"Low Pressure" or "E3"
"E4"
"Water Flow" or "E5"
"E6"
"Condensate" or "E7"
"Voltage Range" or "E8"
"RPM" or "E9"
"Comfort Alert" or "E10"
Lockout Description
High Pressure Fault
Low Pressure Fault
Not Applicable
Water Flow Fault
Not Applicable
Condensate Fault
Voltage out of Range
RPM Fault
Comfort Alert Compressor
Module Fault
These thermostats can be configured to display the lockout condition "text" or error number.
* A slow flash of 1 second on and off means the heat pump microprocessor SW2-1 is configured
for "Test Mode" or thermostat is miswired.
Lockout code 10 - see Comfort Alert module to determine the specific flash code for
compressor abnormalities.
23
NDS INSTALLATION MANUAL
Operation Logic Data
OPERATION LOGIC
HEATING
STG1
STG2
On
Off
COOLING
STG3
EMERG
STG1
STG2
Off
On
Off
SL1 - IN ON
DUAL CAPACITY UNITS
Compressor-Lo
Off
-
Compressor-Hi
Off
On
On
Off
Off
On
-
Rev Valve
Off
Off
Off
Off
On
On
-
Loop Pumps
On
On
On
Off
On
On
On
Secondary 1- Out
On
On
On
Off
On
On
-
Secondary 2- Out
Off
On
On
Off
Off
On
-
Emerg LED
Off
Off
Off
On
Off
Off
-
T-Stat Signal
Y1
Y1, Y2
Y1, Y2, W
W
Y1, O
Y1, Y2, O
-
DIP Switch Settings
DIP SWITCH
NUMBER
SW1
SW2
DESCRIPTION
N/A
OFF POSITION
NOT USED
ON POSITION
N/A
N/A
1
Service/Test Mode - Allows control of “NORM” or “TEST” operational
modes. Test mode accelerates most timing functions 16 times to allow
faster troubleshooting. Test mode also allows viewing the “CURRENT”
status of the fault inputs on the LED display.
Test
Norm
2
Freeze Detection Setting
This DIP allows field selection of freeze detection fault sensing for well
water (30°F) or anti-freeze protected earth loops (15°F).
Loop
(Sensing 15° F)
Well
(Sensing 30° F)
3
Accessory Relay
Allows field selection of the accessory relay to operate with the compressor
or blower.
Blower
Comp
4
NOT USED
N/A
N/A
5
NOT USED
N/A
N/A
6
Input Diagnostics - Allows viewing the inputs from the thermostat to the
control board such as Y1, Y2, O, G, W, SL1-In on the LED display.
Diagnostic Inputs
viewed at LEDs
7
Output Diagnostics - Allows viewing the outputs from the control board
such as the compressor, reversing valve, blower, and loop pump on the LED
display.
Diagnostic
Outputs viewed at
LEDs
8
Thermostat Selection
Configures the control for a pulsed lockout signal (ComforTalk and
FaultFlash thermostats) or continuous 5 VAC lockout signal.
Pulsed “L”
signal
Continuous “L”
signal
1
Single or Dual Capacity Operation
Dual Cap
1 Speed
Normal All other systems
Finish on 2nd
Unzoned Dual
Capacity
E-Series or
Premier 2 speed
Zoned/Finish on Second Stage
2
This switch allows the unit to down stage with the thermostat when off and
finish with second stage when on. Finish on second stage reduces stage
changing in reciprocating dual capacity compressors.
3
ECM Blower Monitoring - Set for No PRM on split systems
SW3
Normal Display
viewed at LEDs
Normal
Display viewed
at LEDs
No RPM
RPM
4
NOT USED
N/A
N/A
5
On dual capacity units this switch allows stage change: on the fly when off,
and 1 minute delay when on. A delay is required on all reciprocating dual
capacity units.
Envision
E-Series or Premier
24
NDS INSTALLATION MANUAL
Refrigeration
Leak Testing
After initial charge, the system should be operated and
the system subcooling and superheat verified to the Unit
Operating Parameters table.
The refrigeration line set must be pressurized and
checked for leaks before purging and charging the unit.
To pressurize the line set, attach refrigerant gauges to the
service ports and add an inert gas (nitrogen or dry carbon
dioxide) until pressure reaches 60 to 90 PSIG. Never use
oxygen or acetylene to pressure test. Use an electronic leak
detector or a good quality bubble solution to detect leaks
on all connections made in the field. Check the service
valve ports and stem for leaks and all connections made in
the field. If a leak is found, repair it and repeat the above
steps. For safety reasons do not pressurize the system
above 150 psi. Purge pressure from line set. The system is
now ready for evacuating and charging.
If an air handler manufactured by others is used then
refrigerant should be added to the Envision Split factory
pre-charge. Refrigerant should be added for liquid line
length. This should result in a slightly under-charged
system exhibiting low subcooling and high superheat.
As charge is added, the subcooling should rise and the
superheat should fall.
Charging the System
Charge Method – After purging and evacuating the line set,
fully open the service valves counterclockwise. Add R-410A
(liquid) into the liquid line service port until the pressure
in the system reaches approximately 200 PSIG. Never add
liquid refrigerant into the suction side of a compressor.
Start the unit and measure superheat and subcooling. Keep
adding refrigerant until the unit meets the superheat and
subcooling values in the Operating Parameters tables.
System Evacuation
Ensure that the line set and air coil are evacuated before
opening service valves to the split unit. The line set must be
evacuated to at least 200 microns to remove the moisture
and air that may still be in the line set and coil. Evacuate
the system through both service ports to prevent false
readings on the gauge because of pressure drop through
service ports.
Checking Superheat and Subcooling
Determining Superheat
Charge Amount When Using NAH Air Handler
1.
Measure the temperature of the suction line at the
point where the expansion valve bulb is clamped.
2. Determine the suction pressure in the suction line
by attaching refrigeration gauges to the schrader
connection on the suction side of the compressor.
3. Convert the pressure obtained in Step 2 to the
saturation temperature by using the Pressure
Temperature Conversion Chart for R-410A.
4. Subtract the temperature obtained in Step 3 from
Step 1. The difference is the amount of superheat for
the unit. Refer to the Operating Parameters tables for
superheat ranges at specific entering water conditions.
The Envision Split is shipped with a facotry pre-charge. This
volume of refrigerant is not sufficient to run the system and
additional refrigerant must be added. If using an NAH Air
Handler please refer to the table in this section for charge
amounts to be added. The “Factory Charge” column is the
charge amount the compressor section/split is shipped
with from the factory. The “Charge Amount with NAH Air
Handler” column is the total amount of charge for the NAH
Air Handler + Compressor section/split. This column does
not factor in additional refrigerant needed for the line set.
The installer of the system must add charge appropriately
for the specific length of the line set. A 3/8 in. liquid line is
calculated at 0.50 oz. of charge per linear foot, and a 1/2
in. liquid line is calculated at 1.0 oz. of charge per linear
foot using R-410A refrigerant. The suction line will not hold
“liquid” and should be ignored for the charge calculation.
Superheat Adjustment
TXVs are factory set to a specific superheat; however, the
superheat should be adjusted for the application. To adjust
the TXV to other superheat settings:
1. Remove the seal cap from the bottom of the valve.
2. Turn the adjustment screw clockwise to increase
superheat and counterclockwise to decrease
superheat. One complete 360° turn changes the
superheat approximately 3-4°F, regardless of
refrigerant type. You may need to allow as much as 30
minutes after the adjustment is made for the system to
stabilize.
3. Once the proper superheat setting has been achieved,
replace and tighten the seal cap.
Example:NDS036/NAH036 with 20 ft. of 3/8 in. liquid line. Remember that when using the NAH Air Handler, the column “Charge Amount with NAH Air Handler” will be used. Now calculate for the additional 20 ft. ineset.
Additional refrigerant to be added= (20 ft. x 0.5 oz.)
= 10 oz.
Solution: 10 oz. should be added to the recommended charge of 86 oz. found in the “Charge Amount with NAH Air Handler” column for a total charge of 96 oz.
Warning: There are 8 total (360°) turns on the superheat
adjustment stem from wide open to fully closed. When
25
NDS INSTALLATION MANUAL
Refrigeration cont.
adjusting the superheat stem clockwise (superheat
increase) and the stop is reached, any further clockwise
turning adjustment will damage the valve.
Determining Subcooling
1.
Measure the temperature of the liquid line on the
small refrigerant line (liquid line) just outside the
split cabinet. This location will be adequate for
measurement in both modes unless a significant
temperature drop in the liquid line is anticipated.
2. Measure the liquid line pressure by attaching
refrigerant gauges to the schrader connection on the
liquid line service valve.
3. Convert the pressure obtained in Step 2 to the
saturation temperature by using the Pressure
Temperature Conversion Chart for R-410A.
4. Subtract the temperature in Step 1 from the
temperature in Step 3. The difference will be the
subcooling value for that unit. Refer to the Operating
Parameters tables for subcooling ranges at specific
enter water conditions.
Line Set Sizes
20 feet
40 feet
60 feet
Unit
Size
Air
Handler
Suction
Liquid
Suction
Liquid
Suction
Liquid
Factory
Charge (oz.)
026
038
049
064
072
NAH026
NAH036
NAH048
NAH060
NAH060
5/8” OD
3/4” OD
3/4” OD
7/8” OD
7/8” OD
3/8” OD
3/8” OD
3/8” OD
1/2” OD
1/2” OD
3/4” OD
3/4” OD
7/8” OD
7/8” OD
7/8” OD
3/8” OD
3/8” OD
3/8” OD
1/2” OD
1/2” OD
3/4” OD
3/4” OD
7/8” OD
1-1/8” OD
1-1/8” OD
1/2” OD
1/2” OD
1/2” OD
1/2” OD
1/2” OD
52
56
90
92
104
NOTES: * The “Charge Amount with NAH Air Handler” column is based on the charge amount for an NAH Air Handler + Compressor Section Split.
Additional charge will have to be added accordingly for line set length.
After charge is added, adjustments can be made to get appropriate subcooling and superheat.
Additional charge for R-410A is 0.50 oz. per ft. for 3/8 in. and 1.0 oz. per ft. for 1/2 in. tube.
26
*Charge
Amount
with NAH
Air Handler
(oz.)
74
86
115
112
132
4/16/10
NDS INSTALLATION MANUAL
Pressure/Temperature Coversion Chart for R-410A
PRESSURE
(PSIG)
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
102
104
106
108
110
112
114
116
118
120
122
124
126
128
130
132
134
136
138
140
142
144
146
148
150
152
154
156
158
160
162
164
166
168
170
172
174
176
178
TEMP
°F
8.5
9.9
11.2
12.5
13.8
15.1
16.3
17.5
18.7
19.8
21.0
22.1
23.2
24.3
25.4
26.5
27.5
28.6
29.6
30.6
31.6
32.6
33.5
34.5
35.4
36.4
37.3
38.2
39.1
40.0
40.9
41.7
42.6
43.4
44.3
45.1
45.9
46.7
47.5
48.3
49.1
49.9
50.7
51.5
52.2
53.0
53.7
54.5
55.2
55.9
56.6
57.4
58.1
58.8
59.5
60.2
60.8
61.5
62.2
62.9
PRESSURE
(PSIG)
180
182
184
186
188
190
192
194
196
198
200
202
204
206
208
210
212
214
216
218
220
222
224
226
228
230
232
234
236
238
240
242
244
246
248
250
252
254
256
258
260
262
264
266
268
270
272
274
276
278
280
282
284
286
288
290
292
294
296
298
TEMP
°F
63.5
64.2
64.8
65.5
66.1
66.8
67.4
68.0
68.7
69.3
69.9
70.5
71.1
71.7
72.3
72.9
73.5
74.1
74.7
75.3
75.8
76.4
77.0
77.5
78.1
78.7
79.2
79.8
80.3
80.9
81.4
81.9
82.5
83.0
83.5
84.1
84.6
85.1
85.6
86.1
86.6
87.1
87.7
88.2
88.7
89.2
89.6
90.1
90.6
91.1
91.6
92.1
92.6
93.0
93.5
94.0
94.5
94.9
95.4
95.8
PRESSURE
(PSIG)
300
302
304
306
308
310
312
314
316
318
320
322
324
326
328
330
332
334
336
338
340
342
344
346
348
350
352
354
356
358
360
362
364
366
368
370
372
374
376
378
380
382
384
386
388
390
392
394
396
398
400
402
404
406
408
410
412
414
416
418
27
TEMP
°F
96.3
96.8
97.2
97.7
98.1
98.6
99.0
99.5
99.9
100.4
100.8
101.2
101.7
102.1
102.5
103.0
103.4
103.8
104.2
104.7
105.1
105.5
105.9
106.3
106.7
107.2
107.6
108.0
108.4
108.8
109.2
109.6
110.0
110.4
110.8
111.2
111.6
112.0
112.3
112.7
113.1
113.5
113.9
114.3
114.7
115.0
115.4
115.8
116.2
116.5
116.9
117.3
117.6
118.0
118.4
118.7
119.1
119.5
119.8
120.2
PRESSURE
(PSIG)
420
422
424
426
428
430
432
434
436
438
440
442
444
446
448
450
452
454
456
458
460
462
464
466
468
470
472
474
476
478
480
482
484
486
488
490
492
494
496
498
500
502
504
506
508
510
512
514
516
518
520
522
524
526
528
530
532
534
536
538
TEMP
°F
120.6
120.9
121.3
121.6
122.0
122.3
122.7
123.0
123.4
123.7
124.1
124.4
124.8
125.1
125.4
125.8
126.1
126.5
126.8
127.1
127.5
127.8
128.1
128.5
128.8
129.1
129.4
129.8
130.1
130.4
130.7
131.1
131.4
131.7
132.0
132.3
132.7
133.0
133.3
133.6
133.9
134.2
134.5
134.9
135.2
135.5
135.8
136.1
136.4
136.7
137.0
137.3
137.6
137.9
138.2
138.5
138.8
139.1
139.4
139.7
PRESSURE
(PSIG)
540
542
544
546
548
550
552
554
556
558
560
562
564
566
568
570
572
574
576
578
580
582
584
586
588
590
592
594
596
598
600
602
604
606
608
TEMP
°F
140.0
140.3
140.6
140.9
141.2
141.4
141.7
142.0
142.3
142.6
142.9
143.2
143.5
143.7
144.0
144.3
144.6
144.9
145.1
145.4
145.7
146.0
146.2
146.5
146.8
147.1
147.3
147.6
147.9
148.2
148.4
148.7
149.0
149.2
149.5
NDS INSTALLATION MANUAL
Operating Parameters
Dual Capacity Models
First Stage Operation
Cooling -- No Desuperheater
Entering Water
Temp °F
50
70
90
Water Flow
GPM/Ton
1.5
3.0
1.5
3.0
1.5
3.0
Suction
Pressure
PSIG
125-140
120-135
135-145
126-143
138-150
136-148
Discharge
Pressure
PSIG
205-225
190-210
260-290
230-250
315-345
300-330
Suction
Pressure
PSIG
76-89
80-93
105-120
110-125
135-155
140-160
Discharge
Pressure
PSIG
260-325
265-330
295-355
300-360
330-385
335-390
Suction
Pressure
PSIG
120-135
115-130
121-136
118-133
126-143
123-140
Discharge
Pressure
PSIG
215-235
200-220
270-305
255-285
325-360
310-340
Suction
Pressure
PSIG
72-81
76-85
100-115
105-120
133-147
138-152
Discharge
Pressure
PSIG
280-330
285-335
305-370
310-375
340-400
345-405
Superheat
Subcooling
9-15
9-15
9-18
9-18
8-14
8-14
3-10
3-10
5-11
5-11
7-14
7-14
Water Temp Air Temp
Rise °F
Drop °F DB
17-21
8-12
16-20
9-13
14-20
8-12
17-23
17-23
17-23
17-23
17-23
17-23
Heating -- No Desuperheater
Entering Water
Temp °F
30
50
70
Water Flow
GPM/Ton
1.5
3.0
1.5
3.0
1.5
3.0
Superheat
Subcooling
7-12
7-12
7-14
7-14
9-14
9-14
4-16
4-16
4-16
4-16
7-15
7-15
Water Temp Air Temp
Drop °F
Rise °F DB
5-9
3-7
7-11
5-9
8-12
6-10
12-16
14-18
18-22
20-24
24-28
22-30
Second Stage Operation
Cooling -- No Desuperheater
Entering Water
Temp °F
50
70
90
Water Flow
GPM/Ton
1.5
3.0
1.5
3.0
1.5
3.0
Superheat
Subcooling
10-16
10-16
9-15
9-15
8-14
8-14
3-11
3-11
5-12
5-12
7-15
7-15
Water Temp Air Temp
Rise °F
Drop °F DB
17-21
8-12
16-20
9-13
14-20
8-12
17-23
17-23
17-23
17-23
17-23
17-23
Heating -- No Desuperheater
Entering Water
Temp °F
30
50
70
Water Flow
GPM/Ton
1.5
3.0
1.5
3.0
1.5
3.0
Superheat
Subcooling
6-12
6-12
6-12
6-12
7-14
7-14
10-20
10-20
6-18
6-18
4-15
4-15
Note: Cooling performance based on entering air temperatures of 80º F DB, 67º F WB.
Heating performance based on entering air temperature of 70º F DB.
28
Water Temp Air Temp
Drop °F
Rise °F DB
5-9
3-7
7-11
5-9
8-12
6-10
12-16
14-18
18-22
20-24
24-28
22-30
NDS INSTALLATION MANUAL
Pressure Drop and Recommended Flow Rates
Dual Capacity
110°F
0.7
1.3
2.2
3.6
1.1
2.3
3.9
5.8
0.8
1.6
2.6
4.8
0.6
1.7
3.3
5.4
0.8
1.7
3.0
5.1
1.8
2.9
4.3
7.2
2.2
3.3
4.4
7.3
5/30/06
Model
026
full
load
026
part
load
038
full
load
038
part
load
049
full
load
049
part
load
064
full
load
064
part
load
072
full
load
072
part
load
GPM
4
6
8
10
3
5
7
9
5
7
9
11
4
6
8
10
6
9
12
15
5
8
11
14
8
12
16
20
6
10
14
18
12
15
18
21
10
13
16
19
30°F
1.4
2.8
4.7
7.0
0.8
2.0
3.6
5.8
1.2
2.2
3.4
4.9
0.9
1.7
2.8
4.2
1.2
2.4
3.9
5.7
0.9
2.0
3.4
5.0
1.8
3.8
6.5
9.7
1.0
2.6
5.0
8.1
3.2
4.5
6.0
7.8
2.3
3.6
5.0
6.5
Pressure Drop (psi)
50°F
70°F
90°F
1.3
1.2
1.1
2.6
2.4
2.3
4.4
4.1
3.8
6.6
6.2
5.8
0.7
0.7
0.7
1.8
1.7
1.6
3.4
3.2
3.0
5.5
5.1
4.8
1.2
1.1
1.0
2.1
1.9
1.8
3.2
3.0
2.8
4.6
4.3
4
0.8
0.8
0.7
1.6
1.5
1.4
2.6
2.5
2.3
3.9
3.7
3.4
1.2
1.1
1.0
2.2
2.1
2.0
3.6
3.4
3.2
5.3
5
4.7
0.9
0.8
0.8
1.8
1.7
1.6
3.1
2.9
2.8
4.7
4.4
4.1
1.7
1.6
1.4
3.5
3.3
3.0
6.0
5.6
5.2
9.1
8.5
8.0
0.9
0.9
0.8
2.5
2.3
2.1
4.7
4.4
4.1
7.6
7.1
6.6
3.0
2.8
2.6
4.2
4.0
3.7
5.7
5.3
4.9
7.3
6.8
6.4
2.1
2.0
1.9
3.3
3.0
2.8
4.6
4.3
4.0
6.2
5.8
5.4
110°F
1.0
2.1
3.5
5.3
0.6
1.5
2.8
4.4
1.0
1.7
2.6
3.7
0.7
1.3
2.1
3.2
1.0
1.8
2.9
4.3
0.7
1.5
2.5
3.8
1.3
2.8
4.8
7.4
0.8
2.0
3.8
6.1
2.4
3.4
4.6
5.9
1.7
2.6
3.7
5.0
5/30/06
29
NDS INSTALLATION MANUAL
Unit Startup
Before Powering Unit, Check The Following:
Startup Steps
8. Decrease the cooling set point several degrees and
verify high-speed blower operation.
9. Adjust the cooling setpoint above the room
temperature and verify that the compressor and water
valve or loop pumps deactivate.
10. Initiate a control signal to place the unit in the heating
mode. Heating set point must be set above room
temperature.
11. First stage heating will energize after a time delay.
12. Check the temperature of both the supply and
discharge water (see Operating Parameters tables).
13. Check for an air temperature rise of 20°F to 35°F
across the air coil, depending on the blower speed and
entering water temperature.
14. If auxiliary electric heaters are installed, increase
the heating setpoint until the electric heat banks
are sequenced on. All stages of the auxiliary heater
should be sequenced on when the thermostat is in
the Emergency Heat mode. Check amperage of each
element.
15. Adjust the heating setpoint below room temperature
and verify that the compressor and water valve or loop
pumps deactivate.
16. During all testing, check for excessive vibration, noise
or water leaks. Correct or repair as required.
17. Set system to desired normal operating mode and set
temperature to maintain desired comfort level.
18. Instruct the owner/operator in the proper operation of
the thermostat and system maintenance.
Notes: Complete the Equipment Start-Up/Commissioning
Check Sheet during this procedure. Refer to thermostat
operating instructions and complete the startup procedure.
Notes: Be certain to fill out and forward all warranty
registration papers.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1.
2.
3.
4.
5.
6.
7.
High voltage is correct and matches nameplate.
Fuses, breakers and wire size correct.
Low voltage wiring complete.
Piping completed and water system cleaned and
flushed.
Air is purged from closed loop system.
Isolation valves are open, water control valves or loop
pumps wired.
Transformer switched to 208V if applicable.
DIP switches are set correctly.
DHW pump switch is “OFF” unless piping is completed
and air has been purged.
Blower rotates freely.
Blower speed correct.
Air filter/cleaner is clean and in position.
Service/access panels are in place.
Return air temperature is between 50-80ºF heating
and 60-95ºF cooling.
Check air coil cleanliness to ensure optimum
performance. Clean as needed according to
maintenance guidelines. To obtain maximum
performance the air coil should be cleaned before
startup. A 10-percent solution of dishwasher detergent
and water is recommended for both sides of coil, a
thorough water rinse should follow.
Initiate a control signal to energize the blower motor.
Check blower operation.
Initiate a control signal to place the unit in the cooling
mode. Cooling setpoint must be set below room
temperature.
First stage cooling will energize after a time delay.
Be sure that the compressor and water control valve or
loop pump(s) are activated.
Verify that the water flow rate is correct by measuring
the pressure drop through the heat exchanger using
the P/T plugs and comparing to unit capacity data in
specification catalog.
Check the temperature of both the supply and
discharge water (see Operating Parameters tables).
Check for an air temperature drop of 15°F to 25°F
across the air coil, depending on the blower speed and
entering water temperature.
Final Evaluation
After the initial check of superheat/subcooling values
in the heating mode, shut off the unit and allow it to sit
3 to 5 minutes until pressures equalize. Restart the unit
in the cooling mode and check the values against those
in the Operating Parameters tables. If the unit performs
satisfactorily, charging is complete. If the unit does not
perform to specifications, the charge may need to be
readjusted until the values are close. Adding refrigerant will
increase subcooling. Recovering some of the refrigerant
will decrease subcooling and increase superheat. If the
superheat/subcooling values are still not close to the
specifications in the Operating Parameters tables, analyze
refrigerant circuit operation.
30
NDS INSTALLATION MANUAL
Unit Startup and Troubleshooting
Heating Cycle Analysis
Measure suction
temperature here
at TXV bulb in
cooling modes.
Measure suction temperature
here at TXV bulb in heating modes.
Volts ____
Suct PSI____
Amps ____
Suct sat temp____
Suct temp____
Super heat____
Lineset
length
Air
Coil
Suction
Comp
Bi-flow
filter/drier
ClgTXV
HtgTXV
COAX
Discharge
Hot Water
Generator
Discharge PSI____
COOLING TXV - ACTIVE
RIGHT TO LEFT
Measure liquid line
temperature and
pressure here in
both heating and
cooling modes
Disch. sat temp____
EWT ____
Liquid temp____
LWT ____
Sub cooling____
HEATING TXV - ACTIVE LEFT TO RIGHT
Note: DO NOT hook up pressure gauges unless there appears to be a performance problem.
Cooling Cycle Analysis
Measure suction
temperature here
at TXV bulb in
cooling modes.
Measure suction temperature
here at TXV bulb in heating modes.
Volts ____
Suct PSI ____
Amps ____
Suct sat temp ____
Suct temp ____
Super heat ____
Lineset
length
Air
Coil
Suction
Comp
ClgTXV
Bi-flow
filter/drier
HtgTXV
COAX
Discharge
Hot Water
Generator
Discharge PSI ____
COOLING TXV - ACTIVE
RIGHT TO LEFT
Measure liquid line
temperature and
pressure here in
both heating and
cooling modes
EWT ____
LWT ____
Disch. sat temp ____
Liquid temp ____
Sub cooling ____
HEATING TXV-ACTIVE LEFT TO RIGHT
31
NDS INSTALLATION MANUAL
Troubleshooting
Standard Microprocessor Controls
4. If control responds improperly:
• Ensure that component being controlled is
functioning (compressor, blower, reversing
valve, etc.).
• Ensure that wiring from control to the
component is functioning (refer to the LED
Definition table below and use the diagnostic
outputs mode).
• If steps above check properly, replace unit
control.
To check the unit control board for proper operation:
1. Disconnect thermostat wires at the control board.
2. Jumper the desired test input (Y1, Y2, W, O or G) to the
R terminal to simulate a thermostat signal.
3. If control functions properly:
• Check for thermostat and field control wiring
(use the diagnostic inputs mode).
LED Definitions and Diagnostics
Standard Microprocessor
LED
NORMAL
DISPLAY MODE
DIAGNOSTIC MODES
CURRENT
FAULT STATUS
INPUTS
OUTPUTS 1
OUTPUTS 2
Field Selection DIPS
SW2-
1 On
SW2-
1 Off
SW2-
1 NA
SW2-
1 NA
SW2-
1 NA
SW2-
6 On
SW2-
6 On
SW2-
6 Off
SW2-
6 On
SW2-
6 Off
SW2-
7 On
SW2-
7 On
SW2-
7 On
SW2-
7 Off
SW2-
7 Off
Drain
Drain Pan Overflow
Lockout
Drain Pan Overflow
Y1
Compressor
(On or Low)
Blower
Low
Water Flow
FD Thermistor
(Loop <15°F,
Well<30°F) Lockout
FD Thermistor
(Loop <15°F,
Well<30°F)
Y2
Compressor
(On or High)
Blower
Medium
High Pressure >600
PSI Lockout
High Pressure >600
O
Reversing Valve
Blower
High
Low Pressure <40/
Comfort Alert
Low Pressure <40/
Comfort Alert
G
Blower
Aux Heat 1
Status
Microprocessor
Malfunction
Not Used
SL1
Loop Pump 1
Aux Heat 3
DHW Limit
HWL Thermistor
>130°F
HWL Thermistor
>130°F
Not Used
Loop Pump 2
Aux Heat 4
DHW Off
DHW Pump
Switch Off
DHW Pump Switch
Off
–
–
–
High
Pressure
Low
Pressure,
Comfort
Alert
Refrigerant Systems
Notes: Refrigerant tests must be made with hot water
generator turned “OFF”. Verify that air and water flow rates
are at proper levels before servicing the refrigerant circuit.
To maintain sealed circuit integrity, do not install service
gauges unless unit operation appears abnormal. Compare
the change in temperature on the air side as well as the
water side to the Operating Parameters tables. If the unit’s
performance is not within the ranges listed, and the airflow
and water flow are known to be correct, gauges should
then be installed and superheat and subcooling numbers
calculated. If superheat and subcooling are outside
recommended ranges, an adjustment to the refrigerant
charge may be necessary.
32
NDS INSTALLATION MANUAL
Preventive Maintenance
Water Coil Maintenance
Condensate Drain
1.
In areas where airborne bacteria produce a slime in the
drain pan, it may be necessary to treat chemically to
minimize the problem. The condensate drain can pick up
lint and dirt, especially with dirty filters. Inspect twice a
year to avoid the possibility of overflow.
Keep all air out of the water. An open loop system
should be checked to ensure that the well head is not
allowing air to infiltrate the water line. Lines should
always be airtight.
2. Keep the system under pressure at all times. It is
recommended in open loop systems that the water
control valve be placed in the discharge line to prevent
loss of pressure during off cycles. Closed loop systems
must have positive static pressure.
Blower Motors
Blower motors on most air handlers are equipped with
sealed ball bearings and require no periodic oiling.
Notes: On open loop systems, if the installation is in
an area with a known high mineral content (125 PPM or
greater) in the water, it is best to establish with the owner a
periodic maintenance schedule so the coil can be checked
regularly. Should periodic coil cleaning be necessary, use
standard coil cleaning procedures which are compatible
with either the cupronickel or copper water lines. Generally,
the more water flowing through the unit the less chance for
scaling.
Air Coil
The air coil must be cleaned to obtain maximum
performance. Check once a year under normal operating
conditions and, if dirty, brush or vacuum clean. Care must
be taken not to damage the aluminum fins while cleaning.
CAUTION: Fin edges are sharp.
Other Maintenance
Filters
Filters must be clean to obtain maximum performance.
They should be inspected monthly under normal operating
conditions and be replaced when necessary. Units should
never be operated without a filter.
Replacement Procedures
Obtaining Parts
In-Warranty Material Return
When ordering service or replacement parts, refer to the
model number and serial number of the unit as stamped on
the serial plate attached to the unit. If replacement parts
are required, mention the date of installation of the unit
and the date of failure, along with an explanation of the
malfunctions and a description of the replacement parts
required.
Material may not be returned except by permission
of authorized warranty personnel. Contact your local
distributor for warranty return authorization and assistance.
33
NDS INSTALLATION MANUAL
Service Parts List
Refrigeration
Components
Compressor
Part Description
038
049
064
072
Compressor
34P585-01
34P573-01
34P574-01
34P575-01
34P586-01
Run Capacitor
16P002D19
16P002D20
Sound Jacket
11P781-01
Solenoid Harness
11P782-01
Accumulator
36P509-02
Coax
62I504B01
62I542B01
TXV
33P609-01
33P609-03
Reversing Valve
33P506-04
33P503-05
Hot Water Generator
62I543B01
33P609-05
33P609-06
33P526-04
36P500B01
36P500B02
62P516-05
62P516-03
Hot Water Generator Pump
24P501-02
Comfort Alert
19P571-02
13P004A03
Transformer
Electrical
16P002D39
36P509-01
Contactor
15P501B01
3 Pole Power Block
12P503-06
2 Pole Screw Term. Block
12P500A01
Status Light Board
17P503-02
Harness, Status Light Board
11P783-01
Premier Board
Sensors &
Safeties
16P002D21
92P504A16
Power Harness
Filter Dryer
Hot Water
Generator
Dual Capacity Split Units
026
17P513-07
Freeze Detection Thermistor
12P505B03
HWL Thermistor
12P505B02
High Pressure Switch
35P506B02
Low Pressure Switch
35P506B01
Part numbers subject to change
6/8/10
34
Manufactured by
WaterFurnace International, Inc.
9000 Conservation Way
Fort Wayne, IN 46809
www.waterfurnace.com
IM1004SN
06/10
Product: Type:
Size: Document:
Envision NDS
Geothermal/Water Source Outdoor Split Heat Pump
2-6 Tons Dual Capacity
Installation Manual
©2010 WaterFurnace International, Inc., 9000 Conservation Way, Fort Wayne, IN 46809-9794. WaterFurnace has a policy of continual product research and development and
reserves the right to change design and specifications without notice.
Download PDF
Similar pages