Water Furnace Envision NRAC026 User manual

IM1618 09/09
Envision Air Coils Installation Manual
Dimensional Data
Installation Information
Maintenance
Geothermal/Water Source Heat Pumps
• R-410A Refrigerant
• 2-5 Ton
ENCASED/UNCASED AIR COILS

2
ENVISION AIR COILS INSTALLATION MANUAL
Table of Contents
Model Nomenclature 3
Initial Inspection  3
Safety Considerations 3
Dimensional Data4-5
General Installation Information  6-9
Hydronic Models  10-11
Maintenance 12

3
ENVISION AIR COILS INSTALLATION MANUAL
WARNING: Before performing service or
maintenance operations on a system, turn off main
power switches to the equipment. If applicable,
turn off the accessory heater power switch.
Electrical shock could cause personal injury.
Installation 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 apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use a quenching cloth for brazing operations and
have a fire extinguisher available.
NOTE: Local codes and regulations take precedent over
any recommendations by the manufacturer. In addition to
conforming to manufacture’s and local municipal building
codes, the equipment should be installed in accordance
with the National Electric Code and National Fire Protection
Agency recommendations.
Model Nomenclature
Initial Inspection
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 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.
Safety Considerations
NR A C 026 C
Model Type Cabinet
NR = Envision Series Refrigerant Coils
NH = Envision Series Hydronic Coils
C = Encased
U = Uncased
Configuration
A = “A” Coil
Capacity
Refrigerant Models
026 MBTUH
036 MBTUH
048 MBTUH
060 MBTUH
Hydronic Models
060 MBTUH
Coil
NOTE: All Refrigerant Coils include TXV.
1-2 3 4 5-7 8

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ENVISION AIR COILS INSTALLATION MANUAL
Dimensional Data
TOP
FRONT
LEFT SIDE
1
3
2
4
5
5
5
E
D
BN
M
AB
AC
AD
T
XY
K
L
BOTTOM
I
G
F
H
C
J
Q
P
Z
AA
R
S
U
A
W
V
O
Encased
Models
Overall Cabinet Connections Supply
Connection
Inlet
Connection
1
Suction
2
Liquid
3
Water
4
Water
5
Condensate
A
Width
B
Depth
C
Height*
D
Supply Width
E
Supply Depth F G H I
Sweat Sweat Sweat Sweat FPT
NRAC026-036C in. 20.8 26.0 29.1 5/8 3/8 - - 3/4 19.0 24.1 23.4 16.8 2.1 2.0
cm. 52.8 66.0 73.9 1.6 1.0 - - 1.9 48.3 61.2 59.4 42.7 5.3 5.1
NRAC048-060C in. 20.8 26.0 29.1 7/8 3/8 - - 3/4 19.0 24.1 23.4 16.8 2.1 2.0
cm. 52.8 66.0 73.9 2.2 1.0 - - 1.9 48.3 61.2 59.4 42.7 5.3 5.1
NHAC026-060C in. 20.8 26.0 29.1 - - 7/8 7/8 3/4 19.0 24.1 23.4 16.8 2.1 2.0
cm. 52.8 66.0 73.9 - - 2.2 2.2 1.9 48.3 61.2 59.4 42.7 5.3 5.1
Encased
Models
Refrigerant & Water
Connections
Condensate
Connections Miscellaneous
J K L M N O P Q R S T U V W X Y Z AA AB AC AD
NRAC026-036C in. 10.4 8.0 14.4 2.4 1.1 1.6 6.1 3.6 0.9 1.5 15.4 17.9 19.9 19.3 1.8 2.4 22.6 25.1 0.8 1.0 1.0
cm. 26.4 20.3 36.6 6.1 2.8 4.1 15.5 9.1 2.3 3.8 39.1 45.5 50.6 49.1 4.5 6.0 57.4 63.7 1.9 2.5 2.5
NRAC048-060C in. 10.4 8.0 14.4 2.4 1.1 1.6 6.1 3.6 0.9 1.5 15.4 17.9 19.9 19.3 1.8 2.4 22.6 25.1 0.8 1.0 1.0
cm. 26.4 20.3 36.6 6.1 2.8 4.1 15.5 9.1 2.3 3.8 39.1 45.5 50.6 49.1 4.5 6.0 57.4 63.7 1.9 2.5 2.5
NHAC026-060C in. 10.4 8.0 14.4 2.4 1.1 1.6 6.1 3.6 0.9 1.5 15.4 17.9 19.9 19.3 1.8 2.4 22.6 25.1 0.8 1.0 1.0
cm. 26.4 20.3 36.6 6.1 2.8 4.1 15.5 9.1 2.3 3.8 39.1 45.5 50.6 49.1 4.5 6.0 57.4 63.7 1.9 2.5 2.5
NOTE: All refrigerant coils feature factory installed TXV. 9/1/09

5
ENVISION AIR COILS INSTALLATION MANUAL
1
2
3
A
C
D
EF G
B
H
J
I
K
L
Overall Dimensions
Uncased 1 2 3
Models A B C Water Water Condensate D E F G H I J K L
Width Depth Height Sweat Sweat FPT
NHAC060U in. 20.0 24.9 25.2 7/8 7/8 3/4 15.0 17.5 0.7 1.3 10.0 2.9 1.7 7.0 13.3
cm. 50.8 63.3 63.5 2.2 2.2 1.9 38.1 44.5 1.8 3.3 25.4 7.4 4.3 17.8 33.8
Condensate Connections
Connections
Hydronic Connections
RIGHT SIDE FRONT BOTTOM
Dimensional Data cont.
Hydronic Coil
1
2
3
C
A
D
E
GF
B
I
J
H
K
L
Overall Dimensions
Uncased 1 2 3
Models ABCSuction Liquid Condensate D E F G H I J K L
Width Depth Height Sweat Sweat FPT
NRAC026-036U in. 20.0 24.9 20.7 5/8 3/8 3/4 15.0 17.5 0.7 1.3 10.0 3.0 1.7 7.0 13.3
cm. 50.8 63.3 52.6 1.6 1.0 1.9 38.1 44.5 1.8 3.3 25.4 7.6 4.2 17.8 33.8
NRAC048-060U in. 20.0 24.9 20.7 7/8 3/8 3/4 15.0 17.5 0.7 1.3 10.0 3.0 1.7 7.0 13.3
cm. 50.8 63.3 52.6 2.2 1.0 1.9 38.1 44.5 1.8 3.3 25.4 7.6 4.2 17.8 33.8
NHAC026-060U in. 20.0 24.9 20.7 - - 3/4 15.0 17.5 0.7 1.3 10.0 3.0 1.7 7.0 13.3
cm. 50.8 63.3 52.6 - - 1.9 38.1 44.5 1.8 3.3 25.4 7.6 4.2 17.8 33.8
NOTE: All refrigerant coils feature factory installed TXV. Water connection dimensions are O.D.
Refrigerant Connections
Connections Condensate Connections
RIGHT SIDE FRONT BOTTOM
Refrigerant Coil

6
ENVISION AIR COILS INSTALLATION MANUAL
General Installation Information
The Envision series encased and uncased coils are designed
for upflow, horizontal, and bottomflow applications. The
coils have a dry nitrogen holding charge and are equipped
with brazing stub refrigerant connections for easy
installation. Both models come equipped with a factory
installed TXV.
The installer should read the installation manual supplied
with the compressor section for refrigerant line set sizing,
connection procedure, and other important information
pertaining to the system installation.
The installer should:
1. Make sure that the air delivery of the furnace is adequate
enough to handle the recommended CFM and allow for
pressure drop across the air coil, filter, and duct work.
2. Where precise forming of refrigerant lines is required, a
copper tubing bender is recommended for small
diameter tubing. One should avoid sharp bends and
contact of the refrigerant lines with metal surfaces.
3. Refrigerant lines should be protected where they pass
through the raw edges of holes.
4. Coil suction line must be insulated, as well as the field
constructed plenum used to enclose the uncased coil.
Encased coils are manufactured with insulated cabinets.
5. Coil must be level for proper condensate drainage.
6. Seal the openings into the cabinet to reduce risk of
condensate blow off from the coil.
NOTE: The installation of optional heating and cooling
equipment must be properly sized and installed in
accordance with the furnace manufacture’s specifications
and recommendations In some cases “heating only”
furnace air circulators may have to be replaced with
multispeed blowers to upgrade the air delivery (CFM)
when an add-on coil is installed Refer to the Encased and
Uncased Coil Specification table for recommended CFM
across the coil and filters
Model NRAC026 NRAC036 NRAC048 NRAC060 NHAC060
BTUH 26,000 36,000 48,000 60,000 60,000
CFM 925 1,225 1,625 1,760 1,760*
Encased and Uncased Coil Specifications
Coil Installation for Encased Models
WARNING: Electric furnaces may be connected to
more than one supply circuit
The installer should:
1. Disconnect all electrical power to the furnace.
2. For the install of an encased coil, it might be necessary
to fabricate a plate to adapt the coil’s cabinet to the
furnace or air handler air discharge opening.
3. Install the cabinet and level it as needed to allow proper
condensate drainage.
4. Seal the enclosure as required minimizing air leakage.
5. Connect the refrigerant lines as outlined in the
Refrigerant Lines section.
Coil Installation for Uncased Models
WARNING: Electric furnaces may be connected to
more than one supply circuit
The installer should:
1. Disconnect all electrical power to the furnace.
2. For the install of an uncased coil, it might be necessary
to fabricate a plate to adapt the coil’s cabinet to the
furnace or air handler air discharge opening.
3. Install the coil and level it as needed to allow proper
condensate drainage.
4. Make a plenum to enclose the coil or drop the duct
directly over the coil.
5. Seal the enclosure as required minimizing air leakage to
reduce risk of condensate blow off from the coils.
6. Insulate the entire plenum assembly as needed.
7. Connect the refrigerant lines as outlined in the
Refrigerant Lines section.
* NHAC060 CFM is dependent on desired capacity (see Hydronic Coil Performance tables in SP1603)

7
ENVISION AIR COILS INSTALLATION MANUAL
General Installation Information cont.
Encased Coil Cabinet Configuration
The Envision encased coil cabinet is factory configured for
upflow and horizontal left hand air discharge installation
(Figure 1). For bottomflow or horizontal right hand
discharge, certain field modifications are required.
WARNING: Do not lift or reposition the ‘A’ coil by
grasping the copper tube header or distributor.
This could cause a tubing fracture resulting in a
refrigerant leak.
Bottomflow Application
To convert the NRA/NHA encased coil cabinets for
bottomflow applications follow the steps shown below:
Bottom air discharge units require the supply air opening 1.
to be cut at least a 1/2” larger than the unit’s air outlet.
When installed on combustible flooring, protect the 2.
edges of the floor opening with sheet metal over wrap or
other non-combustible material.
Bottom air discharge units should be sealed well to the 3.
floor to prevent air leakage.
Horizontal Right Air Discharge
Application
To convert the NRA/NHA encased coil cabinets for
horizontal right air discharge applications follow the steps
shown below
Remove all access panels. Remove the ‘A’ coil assembly 1.
and the horizontal drain pan.
From the vertical upflow position, rotate the top of the 2.
cabinet 90° to the right and set in place.
Remove the support bracket mounted to the top plate of 3.
the ‘A’ coil. Rotate the ‘A’ coil support bracket 180° from
its original position and re-attach into existing holes in
the top plate of the coil. This must be done to prevent
the ‘A’ coil from falling into the drain pan (Figure 3).
Move the horizontal drain pan from the left side of the ‘A’ 4.
coil to the right hand side of the ‘A’ coil. Place the ‘A’ coil
and horizontal drain pan assembly into the cabinet
so that the support bracket is resting in the horizontal
drain pan as shown in Figure 3.
Remove the 2 drain plugs from the upper right of the 5.
access panel and install them on the lower left of the
access panel. Replace the access panels.
If the unit is suspended, the entire length of the cabinet 6.
should be supported.
IMPORTANT: When removing the coil, there
is possible danger of equipment damage and
personal injury. Be careful when removing the coil
assembly from the unit.
Figure 2 - Bottomflow NRA/NHA
Figure 3 - Horizontal Right Hand Air Discharge
Rotate the coil support bracket to this position
Figure 1 - Factory Configuration

8
ENVISION AIR COILS INSTALLATION MANUAL
General Installation Information cont.
Refrigerant Line Connections
Use field supplied tubing of refrigerant grade. Refer to the
Refrigerant Line Sizing table to determine the proper line
set configuration for the system being installed. Line sets
over 60 feet in length are not recommended. If the line set
is kinked or deformed and cannot be reformed, the bad sec-
tion of pipe should be replaced. A restricted line set will af-
fect unit performance. Line sets should be routed as directly
as possible, avoiding any unnecessary bends, and turns. As
in all R-410a equipment, a reversible liquid line filter drier is
required to insure all moisture and non-condensables are re-
moved from the system. This drier should be installed in the
common liquid line if not already installed in the compressor
section. This drier should be replaced whenever “breaking
into” the system for service. ALWAYS evacuate the coil and
line set before opening the compressor section unit service
valves.
When matched with an Envision split the Refrigerant Line
Sizing table below should be followed. If another compres-
sor section is used, follow the manufactures guidelines for
installation.
The installer should.
The encased and uncased coils are pressure tested at the 1.
factory; slowly relieve pressure from the coil and remove
the pressure taps from the suction and liquid stubs on
the coil.
Wrap the TXV and nearby tubing with a heat sinking 2.
material such as a wet cloth.
Connect the refrigerant line set to the coils stubs.3.
Nitrogen should be bled through the system at 2 to 3 psi 4.
to prevent oxidation inside the refrigerant tubing.
Braze the connections using a low silver phos-copper 5.
braze alloy rod.
After brazing, allow joints to cool, leak check the 6.
connections, evacuate the lines, insulate the suction
line and connect TXV as instructed in the TXV
Connection section.
Air
Coil
20 Feet 40 Feet 60 Feet
Suction Liquid Suction Liquid Suction Liquid
NRAC026 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 1/2” OD
NRAC036 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 1/2” OD
NRAC048 3/4” OD 3/8” OD 7/8” OD 3/8” OD 7/8” OD 1/2” OD
NRAC060 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD
Encased and Uncased Refrigerant Line Sizing
NOTE: Adding refrigerant charge for R-410a line set should be calculated using 0.50 oz. per
ft. for 3/8” and 1.0oz. per ft. for 1/2” tube.
Leak Testing
The refrigeration line set must be pressurized and checked
for leaks before purging and charging the system. To pres-
surize 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 the system. Use an electronic
leak detector or a good quality bubble solution to detect
leaks on 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 PSIG. Purge pressure
from the line set slowly when the pressure test is complete.
The system is now ready for evacuation.
System Evacuation
The line set and air coil must be evacuated to 250 microns
with a good quality vacuum pump and use a vacuum gauge
to ensure that the air and moisture are removed. With the
system shut off from the vacuum pump a sufficient system
vacuum is achieved when a 500 micron vacuum can be
held for 30 minutes. A fast rise in atmospheric pressure
indicates a leak, while a slower rise to around 1500 microns
indicates moisture is still present in the system and further
evacuation is required.
TXV Connection
The Envision encased and uncased coils are supplied with
an expansion device. Once the line set has been brazed
into the coil the txv bulb must be attached to the suction
line and insulated with foam tape The bulb should be
placed at the 2 or 10 o’ clock position on the suction line.
Be careful not to crush the txv bulb by over-tightening the
clamp. The TXV supplied has an internal check valve so no
external check valve is necessary. The TXV supplied with
the coil can be adjusted to achieve desired superheat. After
unit start up, check sub-cooling, superheat, and refrigerant
charge; TXV may require further adjustment.
TXV’s may require adjustments for a specific application.

9
ENVISION AIR COILS INSTALLATION MANUAL
General Installation Information cont.
The installer should.
Remove the seal cap from the bottom of the valve.1.
Turn the adjustment screw counterclockwise to increase 2.
superheat and clockwise to decrease superheat. One
complete 360° turn changes the superheat approximately
3-4° F. You may need to allow as much as 30 minutes
after the adjustment is made for the system to stabilize.
Once the proper superheat setting has been achieved 3.
replace and tighten the seal cap.
WARNING: There are a total of 8 (360°) turns on
the superheat adjustment stem from wide open
to fully close When adjusting the superheat stem
counterclockwise (superheat increase) and the
stop is reached, any further counterclockwise
turning adjustment will damage the valve
Condensate Drain
To facilitate condensate removal the encased and uncased
coils must be properly plumbed. The drain line contains
cold water and should be insulated in unconditioned
spaces to avoid drain line condensation from dripping on
ceiling, etc. The drain pan has a primary and auxiliary drain
connection. The coil drain connection must be connected
to a drain line pitched away from the unit a minimum of
1/8” per foot to allow the condensate to flow away from
the coil. A trap must be installed in the drain below the
bottom of the pan to ensure free condensate flow (encased
coils are not internally trapped). The primary condensate
drain must be terminated to an open drain or sump. Do not
connect the condensate drain to a closed waste system.
An open vertical air vent should be installed to overcome
line length, friction, and static pressure. It is recommended
that the auxiliary drain be connected to a drain line for all
units. The auxiliary drain should be run to an area where the
homeowner will notice it draining. The drain line should not
be smaller than the drain connection at the condensate pan.
If the coil is located in an unconditional space, water in the
trap may freeze. It is recommended that the trap material
be of a type that will allow for the expansion of water when
it freezes. Drain lines must be in conformance with local
codes.
Charging the System
Refer to the installation manual supplied with the
compressor section unit for amount of refrigerant charge
and other important information pertaining to the charging
of the system.
Figure 4 -
Decrease Superheat: Open Valve
Increase Superheat: Close Valve
1.5"
3.0"
3/4" PVC
Coupling
Vent (if needed)
3/4" PVC
1/8" per foot

10
ENVISION AIR COILS INSTALLATION MANUAL
Hydronic Models
The water heater and hydronic air handler must be located
indoors and not subject to freezing temperatures. The water
heater must be installed in accordance to local codes and
its own installation instructions. The piping between the
water heater and air handler should be kept to a minimum.
Piping should be sized to allow for water velocities of 2’-4’
per second. At average water velocities, air bubbles should
be carried along the piping to an air separator where they
can be discharged from the system. Water velocities greater
than 4’ per second could cause flow noise and should be
avoided. If water lines pass through an unconditioned space
they should be protected to prevent them from freezing.
Valves should be installed to allow system isolation. All
closed loop hydronic systems must be equipped with
an expansion tank to allow room for the heated liquid to
expand. A system is considered closed when a check valve
or backflow prevention valve is installed in the cold water
pipe upstream of the water heater.
Once piping is complete all air must be purged from the
water lines. There is a dole valve at the top of the hydronic
coil header that can be opened to purge air from the coil.
There is also a plug at the bottom of the hydronic coil
header for draining the coil.
Plug for coil drainage.
Dole valve for air purging
Typical Installation. See the Hydronic Application Guide for other applications
LOAD PUMP
Source IN
P/T PortsP/T Ports
Ball Valve
Dielectric
Unions
Dielectric
Unions
WaterFurnace
HYDRONIC UNIT
WaterFurnace
ENCASED HYDRONIC COIL
*NOTE: A 30 PSI pressure relief valve
(Part No: SRV30) should be used in
hydronic applications.
1-1/2˝
FPT
Expansion
Tank
Air
Vent
Pressure
Gauge
30 PSI
RELIEF VALVE
Air
Separator
TO
DSH
FROM
DSH
Back Flow Preventer /
Pressure Relief Valve
Source OUT
GEO
STORAGE
TANK
P/T Ports

11
ENVISION AIR COILS INSTALLATION MANUAL
Hydronic Models cont.
Flow gpm Pressure Drop (PSI)
40°F 50°F 60°F 100°F 110°F 120°F 130°F
3.0 0.5 0.5 0.5 0.4 0.4 0.4 0.4
4.5 0.9 0.9 0.9 0.8 0.8 0.8 0.8
6.0 1.4 1.4 1.4 1.2 1.2 1.2 1.2
9.0 2.8 2.6 2.5 2.4 2.4 2.4 2.3
12.0 4.6 4.4 4.2 4.0 4.0 4.0 3.9
15.0 7.0 6.8 6.6 6.0 6.0 5.9 5.8
Water Pressure Drop - Hydronic Coil
Entering Water Temperature °F
EAT °F 100 110 120 130 140 150
65 44% 56% 69% 81% 94% 106%
70 37% 50% 63% 75% 87% 100%
Coil Capacity vs. Entering Water Temperature
To ensure optimum system performance and to minimize
the possibility of equipment failure, the following periodic
maintenance should be performed on the coil.
Filter Maintenance
The air filter installed with the system must be cleaned or
replaced to obtain maximum performance. They should be
inspected monthly under normal operating conditions and
be replaced when necessary. Coils should never be oper-
ated without a filter. Always replace the filter with the same
type as originally furnished with the system.
Condensate Drain
In areas where airborne bacteria produce 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.
Air Coil
The air coil must be cleaned to obtain maximum perfor-
mance. Check once a year under normal operating condi-
tions and, if dirty, brush or vacuum clean. Care must be
taken not to damage the aluminum fins while cleaning.
CAUTION: Fin edges are sharp.
Maintenance

12
ENVISION AIR COILS INSTALLATION MANUAL
Notes

13
ENVISION AIR COILS INSTALLATION MANUAL
Notes

Product: Envision Series Encased/Uncased Air Coils
Type: Hydronic or R-410A
Size: 2-5 Ton Single Speed
Document: Installation Manual
IM1618 09/09
Manufactured by
WaterFurnace International, Inc.
9000 Conservation Way
Fort Wayne, IN 46809
www.waterfurnace.com
©2009 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 specications without notice.