Installation Instructions
Installation Instructions
NOTE:
Read the entire
instruction
manual
before
starting
the installation,
TABLE
OF CONTENTS
PAGE NO.
SAFETY CONSIDERATIONS
......................................................................
INSTALLATION
RECOMMENDATIONS
............................................................
2
2
INSTALLATION
3
..................................................................................
Step I -- Check Equipment and Job site ..........................................................
Step 2 -- Install on Solid, Level Mounting Pad ....................................................
3
3
Step 3 -- Clearance Requirements ...............................................................
4
Step 4 -- Operating Ambient ..................................................................
Step 5 -- Elevate Unit ........................................................................
4
4
Step 6 -- Making Piping Connections ............................................................
Step 7 -- Make Electrical Connections ...........................................................
4
4
Step 8 -- Compressor Internal Crankcase Heater
8
...................................................
Step 9 -- Install Accessories ...................................................................
Step 10 -- Start-Up ..........................................................................
8
8
Step 11 -- System Functions and Sequence of Operation .............................................
Step 12 -- Check Charge ......................................................................
9
11
Step 13 -- Pumpdown & Evacuation .............................................................
MAJOR COMPONENTS
...........................................................................
TROUBLESHOOTING
.............................................................................
FINAL CHECKS ..................................................................................
14
15
16
21
CARE AND MAINTENANCE
21
PURON ® REFRIGERANT
.......................................................................
QUICK REFERENCE
GUIDE
...............................................
21
Information
in these
25VNA8 series units.
installation
SAFETY
Improper installation,
or use can cause
instructions
pertains
only
to
Indoor
Thermostat
conditions
which may cause death, personal injury, or property
damage.
Consult
a qualified
installer,
service agency, or your
distributor
or branch for information
or assistance. The qualified
Options
Model
Infinity Touch
Control
Standard
HP Thermostat
25VNA8
Yes*
Yes**
CONSIDERATIONS
adjustment,
alteration, service, maintenance,
explosion,
fire, electrical
shock,
or other
Control
Requires model SYSTXCCUITN01
. software or newer.
** Using standard HP thermostat
or SYSTXCCUITW01
limits functionality
with version 11 .
of system
installer or agency nmst use factory-authorized
kits or accessories
when modifying
this product. Refer to the individual
instructions
packaged
Follow
with the kits or accessories
all safety
codes.
when
Wear safety
installing.
glasses,
protective
and work gloves. Use quenching
cloth for brazing
Have
fire
extinguisher
available.
Read
these
clothing,
operations.
instructions
thoroughly
and follow
all warnings
or cautions
included
in
literature and attached to the unit. Consult local building codes and
current editions of the National Electrical Code ( NEC ) NFPA 70.
In Canada, refer to current editions of the Canadian electrical code
CSA 22.1.
Recognize
safety
information.
This
When you see this symbol on
manuals, be alert to the potential
is the safety-alert
symbol/_k
the unit and in instructions
or
for personal injury.
Understand
- HIGH
ELECTRICAL
HAZARD
Failure to follow
or death.
this warning
VOLTAGE!
could
result in personal
injury
Electrical components
may hold charge.
DO NOT remove
control
box cover for 2 nfinutes
after power
has been
removed from unit.
PRIOR
TO TOUCHING
ELECTRICAL
Verify zero (0) voltage
inverter cover.
COMPONENTS:
at inverter
connections
EXPLOSION
HAZARD
shown
on
these signal words; DANGER,
WARNING, and CAUTION.
These
words are used with the safety-alert
symbol. DANGER
identifies
the most serious hazards which will result in severe personal injury
or death. WARNING
signifies
hazards
which could
result in
personal injury or death. CAUTION
is used to identify unsafe
practices which would
and property
damage.
result in nfinor personal injury or product
NOTE is used to highlight
suggestions
which will result in enhanced
CUT
Failure
installation,
reliability,
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
or operation.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant
compressors.
Pressurized
nfixtures
of air or gases containing
oxygen can lead to an explosion.
HAZARD
to follow
this caution
may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear
appropriate
protective
clothing
and gloves
when
handling parts.
Inverter
Cover
IMPORTANT:
because
the
there
The
inverter
is no reason
inverter.
The
cover
should
to remove
inverter
NEVER
the inverter
has linfited
be removed
cover
to access
serviceability.
Refer
to
Service
Manual
for details
on field replaceable
parts.
replacement
cover is provided with a replacement
inverter.
INSTALLATION
UNIT
OPERATION
AND SAFETY
could
RECOMMENDATIONS
HAZARD
In some
Failure to follow this warning
or equipment damage.
A
result in personal
injury
pulsations
cases
1. Locate
Puron® refrigerant
systems operate at higher pressures than
standard R-22 systems.
Do not use R-22 service equipment
or components
on Puron® refrigerant equipment.
noise
in the
from improper
unit
living
away from
unit operation
area
installation
sound
has been
windows,
may disturb
2. In noise sensitive applications
lineset is mounted to ceiling
traced
to gas
of equipment.
patios,
decks,
etc. where
customer.
(such as bedrooms),
joists or floor joists,
when a
the out-
door unit nmst be located at least 10 ft (3.05 m) away. If
this is not possible,
create a line set configuration
with
ELECTRICALSHOCK
enough bends to provide
length outside the dwelling
HAZARD
3. Ensure
Failure to follow
injury or death.
this warning
could
result
in personal
Before installing,
modifying,
or servicing
system, main
electrical disconnect
switch nmst be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
that vapor
10 ft (3.05
and liquid
m) of total line set
tube diameters
are appropriate
for unit capacity.
4. Run refrigerant
necessary
tubes as directly
as possible
by avoiding
un-
turns and bends.
5. Leave some
bration.
slack between
structure
and unit to absorb
vi-
6. When passing refrigerant tubes through the wall, seal opening with RTV or other pliable silicon-based
caulk (see Fig.
1).
7. Avoid
direct
tubing
contact
with
water
pipes,
8. Do not suspend
Specifications
refrigerant
tubing
from joists
a rigid wire or strap which
comes
in direct
and studs with
contact with tub-
ing (see Fig. 1).
9. Ensure
that tubing
rounds
vapor
10. When
use hanger
to shape
11. Isolate
hanger
and completely
of tubing
straps which
insulation.
straps from insulation
bent to conform
12. If these
is pliable
Conditioners
and
required
retrofit.
to shape
installation
are 1 in. wide
(See Fig. 1.)
of insulation.
recommendations
were
not followed,
gas pulsation
may be transmitted
through
improperly
mounted line sets. In this case, an external vapor line muftier accessory (part no. LM10KK003)
mize noise due to gas pulsations.
is available
Unpack
Move
unit.
to mini-
and Heat Pumps
unit
Step 1 --
by using metal sleeves
for this unit in residential
changes
Check
for
Using
Failure
DAMAGE
Puron®
specific
Equipment
market
Refrigerant
applications
to obtain
and
for
R-22
and Job Site
Unit
to final location.
Remove
carton
taking
care not to damage
This unit employs one louver spacer on each of the four sides to
prevent louver movement during operation.
The louver spacers are
trapped
between
the coil surface
and louver
center of each side (See Fig. 2).
present
and, if dislodged
during
before unit is placed into operation.
EQUIPMENT
new construction
require the outdoor unit, indoor unit (including
metering device),
refrigerant
tubing sets, and filter drier listed in pre-sale literature.
There can be no deviation.
Consult the Service Manual - Air
sur-
tube.
necessary,
conform
insulation
INSTALLATION
duct work,
floor joists, wall studs, floors, and walls.
at the approximate
This louver spacer
shipment,
must be
should be
reinstalled
HAZARD
to follow this caution
may result in equipment
damage.
If proper lineset routing techniques
are not followed, variable
speed systems can be susceptible
to lineset transmitted
noise
inside the dwelling and, in extreme cases, tubing breakage.
Al1380a
Fig. 2 - Louver
M{N
_'-
L_QUiD
Inspect
A07588
The outdoor
for operation
Tubing
m) of field-supplied
or factory
Ac[iust
to/from
refrigerant
charge
the unit depending
by adding
on lineset
calculated
calculates
Installation
unit contains the correct amount of refrigerant
with AHRI rated indoor units when connected
ft (4.57
and displayed
required
charge
accessory
charge
by 15
tubing.
or removing
the charge
length and indoor unit as
on the UI. The user interface
(UI)
ac[iustment
and total system
charge
required.
For proper unit operation,
check refrigerant charge using
charging
information
in the Check
Charge
section
of this
instruction.
IMPORTANT:
applications.
Liquid-line
size
The maximum
is 3/8-in.
allowable
OD for all 25VNA8
equivalent
line set length
is
100 ft. (30.5 m).
IMPORTANT:
Always
install
filter drier. Obtain replacement
branch.
the
factory-supplied
filter driers
Location
TUBE
SUSPENSION
Fig. 1 - Connecting
Spacer
liquid-line
from your distributor
or
Equipment
File claim with shipping company
is damaged
or incomplete.
Locate
panel.
Check
prior to installation if shipment
unit rating plate on unit corner
It contains
information
needed to properly
install
rating plate to be sure unit matches job specifications,
Step 2
--
If conditions
down bolts
Install
on a
Solid, Level Mounting
or local codes require the unit be attached
should
be used and fastened
through
Pad
to pad, tie
knockouts
provided in unit base pan. Refer to unit mounting pattern
to determine base pan size and knockout hole location.
For
hurricane
(Professional
tie downs,
Engineer)
On rooftop applications,
unit above a load-bearing
contact
Certification,
distributor
governing
Roof
wind
mounted
baffles.
rooftop
for details
in Fig. 3
and PE
if required.
mount on level platform or frame. Place
wall and isolate unit and tubing set from
structure. Arrange supporting
members
and minimize transmission
of vibration
codes
unit,
to adequately
support unit
to building.
Consult local
applications.
units exposed to winds above
Consult
the Service
Manual
System
Air
Conditioners
and Heat
Refrigerant
for wind baffle construction.
5 mph may require
- Residential
Split
Pumps
Using
Puron®
NOTE:
Unit must be level to within -2 ° (---3/8 in./ft,-9.5
per compressor
manufacturer
specifications.
mm/m.)
Step 3 -- Clearance
Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 24 in. (609.6 ram)
clearance to service end of unit and 48 in. (1219.2 ram) (above
unit. For proper airflow, a 6-ira (152.4 ram) clearance on 1 side of
unit and 12-ira (304.8 ram) on all remaining sides must be
maintained. Maintain a distance of 24 in. (609.6 ram) between
units. Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
[]NIT
OPERATION
HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Locate the unit in such a way that it is stable in all
circumstances including adverse weather conditions.
On rooftop applications, locate unit at least 6 in. (152.4 ram) above
roof surface.
Step 6 --
Make Piping Connections
3/8-in,
(9,53 mm) Dia,
Tie-down
Knockouts in
Basepan(2) Places
PERSONAL
HAZARD
INJURY AND []NIT DAMAGE
Failure to follow this warning could result in personal iniury or
death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal. Use all service ports and open all
flow-control devices, including solenoid valves.
J
View From Top
A05177
UNIT BASE PAN
Dimension in. (mm)
23
(596
31.2
(792
X
X
X
X
TIEDOWN
A
23
596)
31.2
792)
7-13/16
9-1/8
LOCATIONS
B
(198)
(232)
Fig. 3 - Tie-down
Step 4 -- Operating
KNOCKOUT
in. (mm)
C
4-7/16
(102)
18-1/8
6-9/16
(167)
24-11/16
Knockout
[]NIT
(627)
Ambient
[]NIT
DAMAGE
HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
If ANY refrigerant tubing is buried, provide a 6 in. (152.4
ram) vertical rise at service valve. Refrigerant tubing lengths
up to 36 in. (914.4 ram) may be buried without further
special consideration. Do not bury lines longer than 36 in.
(914.4 ram).
Unit
OPERATION
HAZARD
Do not allow water and/or ice to build up in base pan.
Table 1 - Refrigerant Connections
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. For tubing requirements between 80 - 100 ft.
(24.38 - 30.48 m), capacity and performance losses can occur.
Follow the pipe sizing recommendations in the 25VNA8 Product
data to manage these losses. This unit shall not be installed with
greater than 100 fl (30.48 m) of equivalent line length.
Refer to Table 1 for field tubing diameters. No additional
accessories are required for line lengths between 80 - 100 ft. (24.4
- 30.5 m) on this product.
Failure to follow this caution may result in equipment
damage or improper operation.
and Recommended
Liquid and Vapor Tube Diameters (in.)
LIQUID
UNIT SIZE
25VNA824,
may result in equipment
Do not leave system open to atmosphere any longer than
minimum required for installation. POE oil in compressor is
extremely susceptible to moisture absorption. Always keep
ends of tubing sealed during installation.
Locations
Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit.
[]NIT
HAZARD
Failure to follow this caution
damage or improper operation.
(458)
The n_ininmm outdoor operating ambient in cooling mode is 40°F
(4.4°C) with Infinity Touch Control, 55°F (12.8°C) with
non-conmmnicating
systems. The maximum outdoor operating
ambient in cooling mode is 115°F (46.1°C).
Compressor
protections will prevent cooling mode operation below minimum
ambient temperature range. The system may operate in cooling up
to 125°F (52°C) (52C) with significant reduced capacity cutback
above 115°F (46.1°C). Refer to Product Data "Detailed Cooling
Capacity" table. Low ambient cooling operation is not currently
available.
The maximum heating operation ambient is 66°F
(18.9 oC). Compressor protections will prevent starting below 10 ° F
(-12.2°C) and operation below 2°F (-16.7°C).
Step 5 -- Elevate
DAMAGE
25VNA825
VAPOR*
Connection
Diameter
Tube
Diameter
Connection
Diameter
Max (Rated)
Diameter
Minimum Tube
Diameter
3/8
3/8
3/4
7/8
5/8
25VNA836
3/8
3/8
3/4
7/8
5/8
25VNA848
3/8
3/8
7/8
1 - 1/8
3/4
Units are rated with 25 ft. (7.6 m) of lineset. See Product
Notes:
1. Do not apply
capillary
tube indoor coils to these units,
Data sheet for performance
data when
using different
size and length
line sets,
Outdoor
Unit
to
Factory-Approved
unit contains
correct
with factory-approved,
system
refrigerant
AHRI-rated indoor
Unit
Outdoor
operation
Connected
Sweat Connections
Indoor
charge for
units when
connected by 15 ft. (4.57 m) of field-supplied
or factory-accessory
tubing, and factory-supplied
filter drier. Check refrigerant charge
for maximum
efficiency.
NOTE:
casing
If the indoor
width,
furnace
coil width
refer to the indoor
[]NIT
is more than the furnace
coil Installation
Instructions
Liquid-Line
Filter
Drier
Indoor
Use refrigerant
Refer to Fig. 4 and install filter drier as follows:
1. Braze 5-in. (127 ram) liquid tube to the indoor
2. Wrap filter drier with damp
4. Connect
[]NIT
DAMAGE
coil.
Service
valves
are closed
and indoor coil are now ready for leak testing.
include all field and factory joints.
(127 ram) liquid tube.
and braze liquid refrigerant
grade tubing.
from factory
and ready for brazing. After wrapping
service valve with a wet
cloth, braze sweat connections
using industry accepted
methods
and materials.
Consult local code requirements.
Refrigerant
tubing
cloth.
3. Braze filter drier to above 5-in.
HAZARD
• Use a brazing shield
• Wrap service valves with wet cloth or heat sink material.
for
transition requirements.
Install
DAMAGE
Failure to follow this caution may result in equipment
damage or improper operation.
tube to the filter drier.
Refrigerant Tubing
Evacuate
and
This check
Indoor
should
Coil
HAZARD
[]NIT DAMAGE HAZARD
Failure to follow this caution
improper operation.
Installation
may result in unit damage
or
Failure to follow this caution may result in equipment
damage or improper operation.
of filter drier in liquid line is required.
Never use the system compressor as a vacuum pump.
Refrigerant
tubes and indoor coil should be evacuated
using the
recommended
deep vacuum method of 500 microns. The alternate
triple
triple
evacuation
evacuation
nitrogen
Deep
The
method may be used.
See Service Manual
method.
Always
break a vacuum
with
prior to opening
Vacuum
deep
the refrigerant
system
for
dry
for servicing.
Method
vacuum
method
requires
a vacuum
pump
capable
of
pulling a vacuum of 500 microns and a vacuum gauge capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most
liquid
positive
way of assuring
a system
LEAK IN
SYSTEM
A05227
Fig. 4 - Liquid-Line
Refrigerant
Tubing
connection
Filter
Drier
Outdoor
is free of air and
water. (See Fig. 5)
ffJ
O
ft.
om
Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 1).
No Installation of Adapter
Tube
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
Although it is a heat pump this unit has a standard AC liquid
service valve. An EXV inside the unit serves as the heating
expansion device.
1
2
3
4
MINUTES
5
6
A95424
Fig. 5 - Deep Vacuum Graph
Final
Tubing
Check
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
Step 7 -- Make Electrical
Connections
Connect
Wiring-Infinity
Control
Touch
Connect to Infinity connections.
Only two wires (AB) to Infinity
capable indoor unit (furnace or fan coil) are required.
Connect C if
additional
ELECTRICALSHOCK
Connect
Do not supply power to unit with compressor ternfinal box
cover removed.
Six
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within linfits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE:
Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage may fluctuate above or below
pernfissible linfits.
Use copper wire only between disconnect switch and unit.
are required
when
connecting
supplied
25VNA8
General
Information
Use No.
nfininmm)
18 AWG
or larger
color-coded,
wire for low voltage control wires.
All
wiring
inconfing
power.
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
the power
to the
unit, for the UI to communicate
with
models
to
control,
disconnect
the green (A) and yellow
(B) wires from
ABCD plug and connect appropriate wires to low voltage ternfinal
block. Use wire nuts to attach thermostat wire to LVCH harness.
Route Ground
Wires
(see Fig. 7).
requires
non-communicating
2-stage thermostats.
Use Fig. 8 For required
connections.
Unit
is configured
by factory
for Infinity
communicating
control.
To wire unit for non-communicating
Use
must
be NEC
Class
2 and
insulated
must
(35°C
be separated
from
power leads.
furnace
transformer,
fan
coil
transformer,
or
accessory
transformer
for control power requirement
of system accessories
external to the OD unit. The outdoor unit has its own transformer
Final
Wiring
Check
IMPORTANT:
Check factory wiring and field wire connections
ensure ternfinations
are secured properly.
Check wire routing
ensure wires are not in contact with tubing, sheet metal, etc.
User
ELECTRICALSHOCK
system
Wiring- Non-Communicating
Control
wires
NOTE: Install branch circuit disconnect of adequate size per NEC
to handle unit starting current. Locate disconnect within sight from
and readily accessible from unit, per Section 440-14 of NEC.
and Power
is required
This
outdoor unit, and the indoor
the outdoor unit.
Failure to follow this warning could result in personal
iniury or death.
NOTE:
grounding
IMPORTANT:
HAZARD
Interface
(UI)
Furnace
or Fan
Coil
25VNA
to
to
H P
HAZARD
noi required
25VNA
Failure to follow this warning could result in personal iniury
or death.
HeN
on
Pump
CandD
The unit cabinet must have an uninterrupted
or unbroken
ground to minimize
personal
injury if an electrical
fault
should occur, The ground may consist of electrical wire or
metal conduit
when installed
in accordance
with existing
electrical codes,
Connect
Ground
and Power
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
Humidifier
TERMINAL
BLOCK
1
[email protected] o
WIRING
FIELD GROUND
WIRING
oplion al
Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 6.
FIELD POWER
'C' con necl[on
Al1144
Fig. 7 - Infinity Furnace or Fan Coil Wiring with
Communicating
Variable Speed HP
Q
j
GROUND
LUG
A14028
Fig. 6 - Line Power
Connections
Fan Coil
Thermidistat
I
I
RVS Cooling
I O/B W2 I'"
Heat Stage 3
I
I
i
-1
-t
W1
I
w2
O
Heat Pump
f
......
-__
I=.- ....
Heat/Cool Stage 1
I Y1 /W2
I-
Heat/Cool Stage 2
I
Y/Y2
I'-
Fan
I
G
_'-
24VAC Hot Heating
,,'-I
Rh
I-
24VAC Hot Cooling
_-I
i
I'-
Rc
-t
-4
-t
1
//_
Y1
_ ......
Y/Y2
1" ......
G
I
R
_ ......
I
_El
D1
I--
Dry Contact 2
TL I
D2
_-
24VAC Common
I
C
I'-
Humidify
I
HUM
t-
Outdoor Air Temp
[
OAT
I-
Remote Room Sensor
I
RRS
I--
Y2
I-"
R
I
Single-Stage
J1 Jumper
on Control Board
I
i
I
,i
-I DH b
-I c k ..... -_--I
-I
Humidifier Solenoid
Valve
-"1
c
I
L5
I
III
Outdoor
-1
Sensor
I
!
i
I
I SRT. I
Remote Room
Sensor
i
I
!
I
Wire
Y1 I-" Jumper
Required for
•-_::Lt
I
OAT/RRS
Corn
on Control Board
-_-t
I
I
I
Dry Contact 1
II
J2 Jumper
iI
W/W1
o
Wl
................................
I
A14269
Furnace
Thermidistat
Heat Pump
,-_
I...................
RVS Cooling
Heat Stage 3
I
I O/B W2
I
(furnace)
W/W1
.........
Heat/Cool Stage 1
I Y1 / W2
f-
.........
Heat/Cool Stage 2
I
Y/Y2
t-
......
Fan
[
G
I--_
24VAC Hot Heating
,"1
Rh
24VAC Hot Cooling
_-I
Rc
Dry Contact 1
_
D1
Dry Contact 2
ILl
D2
24VAC Common
I
C
f-
Humidify
I
HUM
[-
Outdoor Air Temp
I
OAT
Remote Room Sensor
I
RRS
OAT/RRS Com
I
SRTN
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A14029
Fig. 8 - Low Voltage Wiring (Non-Communicating)
Step 8 -- Compressor
Crankcase
Heater
Step 9 --
This compressor has an internal crankcase heater. Furnish power
to the unit a minimum of 24 hr before starting the unit for the first
time.
To furnish power to heater only, set thermostat to OFF and close
electrical disconnect to outdoor unit.
Power is not required to the indoor unit or User Interface for proper
operation of heater.
Crankcase heater will be intelligently
energized as needed between operations, even when the UI or
thermostat and indoor unit is not installed, as long as there is power
to the outdoor unit.
Airflow Setup for Infinity Touch
or FE Fan Coil (communicating)
Control
No refrigeration circuit accessories are required or are available for
installation within the unit.
External to the unit, the same
accessories such as support feet, snow rack, wind baffle etc.,
available on other Carrier units, can also be used on this line of
product. For models utilizing 23 inch x 23 inch base pans, it is
recommended to use 5 support feet in order to fully support unit.
See Fig. 9.
Refer to the individual Installation Instructions
packaged with kits or accessories when installing.
Furnace
This system can only be installed with Infinity-capable indoor and
Infinity Touch User Interface (UI) SYSTXCCUITN01
or
SYSTXCCUITW01
with version 11 software or newer. When
using an Infinity Touch User Interface, airflow is automatically
selected based on equipment size. The user has the option of
selecting Comfort, Efficiency and Max airflow for Heating and/or
Cooling modes.
These should be selected based on balance
between the homeowner's
comfort and energy consumption
expectations. See User Interface Installation Instructions for
additional available adjustments.
Due to using a communicating control with the fan coil or the
furnace, dip switch adjustments are not necessary. The outdoor
unit configuration and the indoor airflows are determined by
communicating control setup.
Airflow
Setup
for Non-communicating
For replacement applications with older FV4(A,B), FK4 and 40FK
fan coils, the model plug in the outdoor unit must be changed per
Table 2 below.
The model plug adjusts compressor speed to match available low
stage indoor airflow.
Table 2 - Alternate Model Plug
Factory
Model Plug #
H K70EZ***
25VNA824
25VNA825
001
016
25VNA836
002
017
25VNA848
003
018
Airflow
also require
Setup
Step
10 --
Support
Feet Location
Start-Up
UNIT OPERATION
AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
Observe the following:
1. Do not overcharge system with refrigerant.
2. Do not operate unit in a vacuum or at negative pressure.
3. Do not disable low pressure transducer or high pressure.
4. Dome temperatures may be hot.
FK4, 40FK Fan Coil Models*
outdoor model plug change)
Unit Size
FK4 and 40FK
A14008
Fig. 9 - Recommended
Fan Coil
The system can be installed with a standard 2-stage heat pump
thermostat and FV4C fan coil without additional accessories.
Select appropriate unit size on fan coil Easy select board.
FV4(A,B),
(Requires
Install Accessories
a TXV change.
Required Accessory
Model Plug #
H K70EZ***
See accessory
for Non-communicating
list for approved
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective
handling refrigerant.
clothing, and gloves when
TXV.
Furnaces
For installations with non-communicating furnaces, set airflows to
350-400 cfm/nominal ton in high stage and 70-80 percent of high
stage airflow in low stage.
ENVIRONMENTAL
HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.
Follow
these
steps
to properly
start
up the system:
1. After system is evacuated, close the disconnects
to energize
the ID and OD units to access the user interface (UI), Keep
system in off mode.
Under the Advanced
function menu,
on the Infinity
Touch Control,
access the REQUIRED
CHARGE
CALCULATION
screen.
Enter the lineset
length and vapor tube diameter.
The user interface (UI)
will now display the required charge adjustment
(see Fig.
10 for example) for the lineset and an adjustment for a large
indoor coil if recognized
as such by the UI.
2. Add or remove the required charge
length to liquid service valve.
Note:
moval
If lineset is less than
may be necessary.
3. Fully open liquid
and vapor
adjustment
15 feet (-9.4°C),
for lineset
charge
re-
service valves.
Step 11 -Operation
System
The 25VNA8
models
Functions
utilize
and Sequence
either Infinity
User Interface (UI) or conventional
controls,
a call for cooling
will
Touch
of
Communicating
HP thermostat.
When
energize the outdoor
using UI
fan and
compressor
to run at lowest cooling demand. If this does not satisfy
cooling demand, the system will ramp up in stages until it satisfies
the demand. After coping with the higher demand, the unit returns
to lower capacity operation until the demand is satisfied or until an
increase in demand.
When using a conventional
thermostat,
the
thermostat controls the staging of outdoor unit.
When all demand is satisfied, the compressor
will shut off. As the
unit operates at lower capacity, system vapor (suction) pressure will
be higher than it is during a standard single-stage
system operation
or during a higher capacity operation.
The user interface (UI) displays the operation mode and fault codes
as specified in the troubleshooting
section. See Table 7 for codes
and definitions.
The conventional
thermostat inputs are designed to work with most
indoor units. See AHRI for approved combinations.
Connections
are Y/Y2, YI, O, R, W, and C. Depending
on thermostat
and
indoor unit, the system will operate at 1 or 2 capacities in heating
or cooling mode.
NOTE:
Only one code will be displayed
on the outdoor
control board (the most recent, with the highest priority).
latest codes are stored and can be accessed via the UI.
A14019
Fig. 10 - Required
Charge
Adjustment
Calculated
in UI
4. Set User Interface to operate cooling in CHARGING
mode.
Charging mode operates system compressor
speed and fan
speeds to proper conditions
to check the refrigerant charge.
NOTE:
See Step 13 for charging
5. Wait for the specified
check.
stabilization
time, depending
on line-
set length.
Compare subcooling
at liquid line service valve
to Liquid Line Subcooling
Target as shown CHARGING
screen
(LiqLin
SC TGT)
(see Fig. 11 for example).
unit
The
Upon a call for cooling through the UI (or the YI and/or Y2
connections
in a non-communicating
system), the Application
Operation Control (AOC) board (see Fig. 19) will open the EXV to
the fully open position. For heating, the AOC board will open the
EXV to a preset position, depending
upon the conditions.
Based
upon the indoor space demand and the outdoor conditions,
the UI
will then request a compressor
speed and outdoor fan motor speed.
If the conditions
are correct for operation,
the control board will
allow the requested
operation
to begin, but if the control board
determines
that the conditions
are not correct, the board will decide
what other operation
nearing that condition
is acceptable.
The
inverter
Motor Operational
Control
(MOC)
then outputs
the
three-phase
PWM signal and frequency
that gently ramps the
compressor
speed up to stage 2, and then will adjust to the
demanded
speed. The gentle ramp-up
results in no locked rotor
amps to the compressor
motor. The unit 0 for compressor
LRA will
be stamped
N/A (not applicable).
During operation,
the AOC monitors
itself and the compressor
operation
along with the system pressures and temperatures.
The
MOC board monitors
the temperature,
current
and operational
status of the compressor,
OD fan and the inverter itself. During
operation,
the compressor
speed will be adjusted
to meet the
changes to the demand.
A14020
Fig. 11 - Liquid
Line Subcooling
Target
When the demand is satisfied, the inverter will ramp-down
the
compressor
speed and stop.
The EXV will step down to the
completely
closed position.
When the compressor
stops, a 35 nfinute Time Guard period is
activated which is followed by opening of the PEV valve for 150
seconds to equalize the refrigerant pressure difference between the
high and low sides of the compressor.
Upon equalizing
the
refrigerant
pressure,
and an additional
15 seconds of the Time
Guard period, the compressor
will be ready for the next operational
demand.
If there is a power cycle, the Pressure Equalizer Valve (PEV) will
open for 150 seconds before the compressor
start-up.
Opening the
PEV valve returns the discharge
gas directly back to the suction
side of the compressor.
This is done in either cooling or heating
mode so that the rotary compressor
will start with a very low
pressure differential.
The
3.5
nfinute
Time
Guard
can
be bypassed
by
shorting the Forced Defrost pins. Only the 3.5 nfinute
can be bypassed.
Because it is important for compressor
the 150-second
PEV delay cannot be bypassed.
momentarily
time delay
reliability,
A14021
Fig.12Crankcase
AOC
Operation
Heater
Control
Board
Communication
This unit has an internal crankcase heater that will be energized
during the off cycle and is intelligently
demanded by the system to
Infinity
prevent the compressor from
thus enhancing
the reliability.
A green
being the coldest part of the system
The crankcase heater will flmction
as needed any time the outdoor unit is powered. The indoor unit
and UI do not need to be installed for the crankcase
heater to
operate
The
properly.
compressor
windings
will
occasionally
be energized
during
the OFF cycle (depending
on the length of the OFF cycle) to start
the stator heat operation, thus maintaining
a sump temperature
that
is essential for compressor
reliability.
The compressor
will not run
during
this process.
Outdoor
Fan
Motor
Operation
Time
and the cooling
or heating
capacity
required.
Delays
The unit time delays
Control,
Green
include:
• 3.5 minute time delay after last cycle, initial power up, return
from brown-out
condition.
To bypass this feature, momentarily
short and release Forced Defrost pins.
• At the end of every compressor
ON cycle, there will be 150
seconds of PEV open period for pressure equalization
followed
by 15 seconds of PEV Off period before the next compressor
ON cycle. This delay cannot be bypassed as it helps compressor
reliability.
• 15 second delay at termination
of defrost before the auxiliary
heat is de-energized.
• See Table 7 for other delay information.
Lights
Communications
(COMM)Light
LED
(COMM
light) on the outdoor
board
(see Fig. 12)
indicates
successful
communication
with
the other
system
products. The green LED will remain OFF until communication
is
established.
Once a valid command is received, the green LED will
turn ON continuously.
If no conmmnication
minutes,
the LED will be turned
OFF
communication.
standard 2-stage
Amber
Status
is received within 2
until the next valid
The green LED will be turned off when using a
non-communicating
heat pump thermostat.
Light
Amber colored STATUS light indicates
See Table 7 for definitions.
The outdoor unit control (Fig. 12) energizes outdoor fan anytime
the compressor
is operating, except for defrost. The OD fan motor
is variable speed. The speed will change depending on the ambient
temperature
Touch
and Status Function
operation
• Two minute time delay to return to standby
valid communication.
and error status.
operation
from last
Defrost
This user interface (UI) offers 5 possible defrost interval
60 and 90 minutes, or AUTO.
The default is AUTO.
Defrost
interval
times:
30,
60,
and
90
minutes
or
times: 30,
AUTO
are
selected by the Infinity Touch Control User Interface if using UI.
The 90 and 120 minute selection will default to 60 minutes at
ambient
below
to 90 minutes
37 degrees.
at ambient
The
120 minute
selection
will default
above 37 degrees.
If using non-communicating
thermostat,
defrost intervals are set
using dip switches on outdoor control board (see Fig. 12). AUTO
defrosts adjusts the defrost interval time based on the last defrost
time as follows:
• When defrost
time <5 minutes,
the next defrost
minutes. (outdoor temperature
above 37°F)
• When defrost time 5-7 minutes, the next defrost
minutes.
• When defrost
minutes.
10
time >7 minutes,
the next defrost
interval=90
interval=60
interval=30
Thecontrolboardaccumulates
compressor
run time.
accumulated
run time approaches
the selected
defrost
As the
interval time,
the control board monitors the coil temperature
sensor for a defrost
demand. If a defrost demand exists, a defrost cycle will be initiated
at the end of the selected time interval. A defrost demand exists
when the coil temperature
is at or below 32°F (0°C) for 4 minutes
during the interval. If the coil temperature
does not reach 32°F
(0°C)
over.
within
the interval,
the interval
timer will be reset and start
• Upon initial power up the first defrost interval is defaulted to 30
minutes. Remaining
intervals are at selected times.
• Defrost is only allowed to occur below 50°F (10°C) outdoor
ambient temperature.
The defrost
cycle is terminated
as described
below.
• When OAT is > 25 °F (+3.89 ° C), defrost terminates if outdoor
coil temperature
(OCT) > 60°F (+15.6°C).
And a minimum of 2
minutes defrost length.
• When OAT _> 25°F (+3.89°C),
defrost will terminate if OCT is
>45 °F (+4.4 ° C) and a minimum
• Or 10 minutes has passed.
At the defrost
before
NOTE:
the outdoor
defrost
length.
fan will turn on 10 seconds
valve switching.
Compressor
Step 12 -Charge
termination,
the reversing
of 2 minutes
speed during
mode
defrost
will go to defrost
speed.
(communicating
only)
Factory charge amount and desired subcooling
are shown in the
user interface (UI). To properly check or adjust charge, conditions
must be favorable
for subcooling
charging
in cooling
mode.
Favorable
conditions
exist when
the outdoor
temperature
is
between
65°F and 100°F
(18°C
and 38°C),
and the indoor
temperature
is between
70°F and 80°F (21°C and 27°C). If the
temperatures
are outside of these ranges, weigh-in
charge only. If
charge confirmation
is needed
return to check subcooling
in
cooling mode when between 65°F (18.3°C)
and 100°F (37.8°C)
or use heating check chart in heating mode below 65°F (18.3°C).
Charging
Procedure:
Unit is factory charged for 15ft (4.57 m) of
lineset. If any refrigerant charge adjustment is required due to the
user inputted line set length, the UI will calculate and display the
target subcooling
and the amount of additional charge to be added.
Therefore,
the UI is your source of information
for charging the
system correctly. Refrigerant
charge adjustment
amount for adding
or removing 0.6 oz/ft (17.74 g/m) of 3/8 liquid line above or below
15ft (4.57 m) respectively. Perform a final charge check only when
in cooling and OD is between 65°F (18°C) and 100°F (38°C).
NOTE:
UI indicates acceptable conditions
if outside of this range.
Do not charge if outside 65°F (18°C) and 100°F (38°C) outdoor
temperature.
If the range
is acceptable,
go the CHARGING
screen
in the user
interface (UI). At cooling conditions,
set the user interface (UI) to
check the charge in cooling mode.
Allow system to operate in
cooling mode for the stabilization
period as indicated in the user
interface
(UI). Once conditions
are indicated
as favorable
and
stable by the user interface
(UI), check the system charge by
subcooling
method.
Compare the subcooling
taken at the liquid
service valve to the subcooling
target (LiqLin SC TGT) listed on
the charging screen. Add refrigerant if the subcooling
is low and
remove
charge if subcooling
(no greater
25 minutes
is high.
Tolerance
should
is necessary,
add or remove
the charge
slowly
than 0.5 lb per minute) and allow system to operate for
to stabilize before declaring a properly charged system.
The use of a commercial
charge metering device (restrictor) such as
Imperial
liquid
low side
charger
model
535-C
or Watsco
ChargeFaster
model
CH200
is recommended
when
adding
refrigerant to an operating system.
This prevents potential damage
of liquid slugging of the compressor
and allows the subcooling
to
stabilize quicker.
If the indoor
temperature
is above 80°F (26.67°C),
and the
outdoor temperature
is in the favorable range, adjust system charge
by weight based on line length and allow the indoor temperature
to
drop to 80°F
by subcooling
(26.67°C)
before attempting
method as described above.
to check
system
charge
If the indoor temperature
is below 70°F (21.11°C),
or the outdoor
temperature
is not in the favorable range, adjust charge for line set
length above or below 15ft (4.57 m) and indoor fan coil / furnace
coil per Table 3. Charge level should then be appropriate
for the
system to achieve rated capacity. The charge level could then be
checked
at another
time when the both indoor
and outdoor
temperatures
maximum
Check Charge
in CHARGING
If any adjustment
are
efficiency
in
a more
favorable
range.
This
ensures
and reliability.
Charging Non-Communicating
Systems
Charging
Procedure:
Force system to operate in high stage
cooling by creating a large differential between room temperature
and set point on thermostat.
Use multi-meter
to verify that 24
VAC is present between C, YI/Y2
terminals at outdoor unit.
Factory charge amount is shown on unit rating plate for high stage.
Target subcooling
chart is provided on back of control box door
see Fig. 13 - 15 for example.
To properly check or adjust charge,
condition
must be favorable
for subcooling
charging. Favorable
conditions
exists when
outdoor
temperature
is between
65°F
(18°C) and 100°F (38°C), and the indoor temperature
is between
70°F (21°C) and 80°F (27°C). Follow the procedure below:
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge
by adding or removing 0.6 oz/ft (17.7 g/m) of 3/8 liquid line above
or below
15ft (4.57 m) respectively.
For standard refrigerant line lengths (80ft/24.4
m or less), allow
system to operate in cooling mode at least 25 minutes. If conditions
are favorable,
check system charge by subcooling
method. If any
adjustment is necessary, adjust charge slowly and allow system to
operate for 25 minutes to stabilize before declaring
a properly
charged system.
If the indoor temperature
is below 70°F (21.11 °C), or the outdoor
temperature
is not in the favorable range, adjust charge for line set
length above or below 15ft (4.57 m) and indoor fan coil/furnace
coil per Table 4. Charge level should then be appropriate
for the
system to achieve rated capacity. The charge level should then be
checked
at another
time when the both indoor
and outdoor
temperatures
are in a more favorable
range.
NOTE:
If the line length is beyond 80fl (24.38 m) or greater than
20fl (6.10 m) vertical separation see Long line guideline for special
charging requirement.
be --2°F.
11
Table
3 Furnace or Fan Coil Model
Number
Required
Charge
Adjustment
25VNA824A003
for Indoor
Coil Model
25VNA825A003
25VNA836A003
25VNA848A003
CNPV*36**
0
0
0
N/A
CAP**36**
CSPH*36**
0
0
0
0
0
0
N/A
N/A
FE4A or FV4(A,B,C)NF002
0
0
0
N/A
FE4A or FV4(A,B,C)N(B,F)003
CNPV*42**
CAP**42**
CNPV*48**
0
0
0
+0.75
0
0
0
+0.75
0
0
0
+0.75
N/A
N/A
N/A
0
CAP**48**
CSPH*48**
+0.75
+0.75
+0.75
+0.75
+0.75
+0.75
0
0
FE4A or FV4(A,B,C)N(B,F)005
CNPV*60**
+0.75
N/A
+0.75
N/A
+0.75
N/A
0
0
CSPH*60**
CAP**60**
N/A
N/A
N/A
N/A
N/A
N/A
0
+2.2
FE4A or FV4(A,B,C)NB006
N/A
N/A
N/A
+2.2
CHARGING
uid Service
iN
Valve
COOLING
Subcoolin(
- For
MODE
all AHRI
- 24,
listed
indoor
I
(36°C)
(39°C)
(42°C)
(44%)
25
combinations
I
(47°C)
I
(50°C)
I
(53°C)
(56°C)
(58°C)
Outdoor Ambient Temperature °F (%)
Fig.
13 -
Charging
in Cooling
Mode
25VNA824/25
CHARGINGiN COOLING
MODE- 36
Liquid
20
Service Valve Subcooling
= For all AHRI listed indoor combinations
19.5
I
I
I
II
I
I
18.s
_
¢._
_
o
t6.s
N
16
15.5
15
65
70
75
(36oc) (3_oc)
80
(42oc)
85
(_c)
90
(47oc)
Outdoor
Fig. 14 - Charging
95
(50oc)
(53oc)
Ambient
Temperature
in Cooling
Mode
t00
t05
(5_c)
(_8oc)
(42_C)
(
(
Outdoor
Fig.
15
- Charging
Ambient
Temperature
in Cooling
12
Mode
(_oc)
iiiiiiiiiiiiiiiiiiiiiiiiiiiii
Y
(39_C)
1t5
25VNA836
:
(3PC)
1t0
(610c)
°F (°C)
°F (°C)
25VNA848
Heating
Check
(Communicating
Chart
Procedure
/ Non-communicating
(See Fig.16 - 18)
running in stage 5 with appropriate
outdoor fan speed and indoor
airflow.
Upon completion
of a countdown
period for system
stabilization,
check
refrigerant
pressures
for the appropriate
ambient temperatures
shown in Fig. 16, 17 or 18 based the OD unit
size.
Systems)
In heating mode, the required charging method is by weigh-in.
On
new installations
or complete recharge,
refer to the unit 0 and
indoor fan coil / furnace coil per Table 3 for additional charge
needed.
Refrigerant
charge adjustment amount
for adding or
removing 0.6 oz/fl (17.74 g/m) of 3/8 liquid line above or below
15fl (4.57 m) respectively.
Use the Defrost CHECKOUT
mode to remove ice or frost from
coil, if present,
prior to checking
the heating
To use the Heating Check Chart in non-communicating
systems,
operate
system
at Yl+Y2-high
stage.
These charts indicate
whether
a correct
relationship
exists between
system operating
pressure and air temperature
entering indoor and outdoor units. If
pressure and temperature
do not match on chart, system refrigerant
charge may not be correct. DO NOT USE CHART
TO ADJUST
REFRIGERANT
CHARGE.
pressures.
To use the Heating Check Chart, the user interface (UI) must be in
Refrigerant
Charging
mode selected
from the Installation
and
Service screen.
The Charging
Mode Selection screen will show
selections for Weigh-In
Charge Method or Heating Check Charge
Method.
Select Heating
Check Charge Method.
The Heating
Check Charge method will only be displayed if the conditions
are
right for checking
the charge in heating mode. When Heating
Check Charge Method is selected,
the system will operate by
NOTE:
High pressure is at vapor service valve.
high pressure is taken from liquid service valve.
NOTE:
must
When
charging
be weighed
is necessary
in accordance
(--17.74
g/m). of 3/8-in.
m), respectively.
during heating
with
liquid-line
Heatin 9 Check Chart - 24, 25
For use in Heating
Charging
Mode
only
- For all AHRI
listed indoor
combinations
480
I
400
=
Vapor
Valve
I
I
Service
Pressure
"
"
"
"
350
300
200
250
180
100
Suction
Pressure
__.=.==_=_
8C
=
20
30
(4°C)
40
(-t_C)
Outdoor
Fig. 16 - Heating
50
(4°0)
Ambient
Pressure
60
(10°C)
Temperature
°F
Check
(t6°C)
65
(_°C)
(°C)
Chart
25VNA824,
25
Heating Check Chart • 36
For use
400
Vapor
in Heating
Service
380 _
Charging
Mode
only = For
all AHRI
listed
indoor
combinations
--
2757
o
°C
i
"
2413
2565
250
1724
200
U_
1380
_.
5
tO
20
(.12_C)
30
(.7°C)
(.1_0)
Outdoor
{4_0)
Ambient
Fig. 17 - Heating
Temperature
Pressure
°F (°C)
Check
Chart
25VNA836
Heating Check Chart - 48
For use in Heating
Charging
Mode
only
I
I
i
Vapor
Valve
10
(.12°C}
Service
Pressure
-
20
(-70C)
30
(.1°C)
Outdoor
Fig. 18 - Heating
Ambient
-
-
40
(4°C)
50
(10°C)
Temperature
Pressure
Check
13
°F (°C)
(;hart
25VNA848
60
(16°C}
Add
12 psig if
season,
charge
unit rating plate,
--0.6 oz./fl
above
15 fl (4.57
or below
Step 13 -- Pumpdown
& Evacuation
4. The unit will continue to run until high or low pressure
switches open. Close vapor service valve once compressor
shuts down.
ENVIRONMENTAL
Failure to follow
damage.
HAZARD
this caution
may
result
5. Remove power from indoor and heat pump unit prior to
servicing unit.
6. A quantity of charge will remain in isolated section of
system dependent on ambient temperature and overall
system charge. This charge must be manually recovered. A
recovery system will be required to remove final quantity of
refrigerant from indoor coil and line set.
in environmental
Federal regulations
require that you do not vent refrigerant to
the atmosphere.
Recover
during system repair or final unit
disposal.
If this system requires either a Pump Down or Evacuation for any
reason, the procedures below must be followed:
Pump Down - Infinity
Communicating
Because this system is inverter controlled, compressor, suction
pressure transducer and EXV, conventional procedure cannot be
used to "pump down" and isolate the refrigerant into the outdoor
unit. The UI (User Interface) has provisions to assist in performing
this function.
Evacuation
and recovery
of refrigerant
from 25VNA8
Because this system has an EXV for the heating expansion device,
additional steps may be taken to open the EXV for fastest
refrigerant recovery and evacuation. If the EXV is not open when
pulling a vacuum or recovering refrigerant from the heat pump
unit, extended evacuation time may be required and/or inadequate
vacuum obtained. The UI (User Interface) has provisions to open
the EXV for refrigerant recovery and/or evacuation.
1. Connect gauges to 25VNA8 liquid and vapor service valve
ports to monitor operating pressures during and at completion of the procedure. Attach recovery system or vacuum
pump to gauge set as needed for the service procedure. The
service valves must be open to evacuate the unit through the
line set service ports. The suction capillary service port is a
direct connection to the suction port of the compressor and
may also be used.
2. In the advanced menu of the UI, go to Checkout > Heat
Pump > Evacuation.
3. Set desired time period. Default time period for the procedure is 120 minutes.
1. Connect gauges to 25VNA8 liquid and vapor service valve
ports to monitor operating pressures during and at completion of the procedure.
2. In the advanced menu of the UI, go to Checkout > Heat
Pump> Pumpdown
3. Select mode to pump down in (COOL or HEAT), COOL
mode allows refrigerant to be isolated in outdoor unit.
HEAT mode allows the refrigerant to be isolated in indoor
coil and lineset. Set desired time period. Default time period for the procedure is 120 minutes.
4. Select Start on UI to begin the pump-down process. []nit
will begin running in selected mode after a brief delay.
5. Close the liquid service valve.
6. The unit will run in selected mode with the low pressure
protection set to indicate pump-down is complete when the
suction pressure drops below 10 psig. Compressor protections are still active to prevent damage to the compressor or
inverter (high pressure, high current, high torque, etc.).
7. Once system indicates pump-down complete or failure to
complete shutdown, close vapor service valve.
8. A small quantity of charge will remain in isolated section of
system dependent on ambient temperature and overall system charge. This charge must be manually recovered. A
recovery system will be required to remove final quantity of
refrigerant from indoor coil and line set.
9. Remove power from indoor and heat pump unit prior to servicing unit.
4. Select START on UI to open the valve.
5. Begin evacuation or refrigerant recovery as required for the
procedure after UI indicates the EXV is open. Power may
be removed from heat pump after the UI indicates "READY
TO EVACUATE."
6. Remove power from indoor and heat pump unit prior to servicing unit. The EXV will retain the open position.
NOTE:
See service training materials for troubleshooting the
EXV using EXV CHECK mode.
Evacuation
and recovery
of refrigerant
from 25VNA8
when using non-communicating
thermostat
Refrigerant recovery and evacuation can be performed without a
UI (User Interface) but will take more time. If EXV is not forced
open the recovery and evacuation must rely on check valve as a
bypass.
1. Connect gauges to 25VNA8 liquid and vapor service valve
ports to monitor operating pressures during and at
completion of the procedure.
Attach recovery system or
vacuum pump to gauge set as needed for the service
procedure. The service valves must be open to evacuate the
unit through the line set service ports. The suction capillary
service port is a direct connection to the suction port of the
compressor and may also be used.
2. Begin evacuation or refrigerant.
Allow extra time for
refrigerant recovery and establishing a thorough evacuation.
Pump Down - Using 2-stage HP Thermostat
(Non- Communicating)
Because this system has an inverter controlled compressor, suction
pressure transducer and EXV, conventional procedure cannot be
used to "pump down" and isolate the refrigerant into the outdoor
unit.
1. Connect gauges to 25VNA8 liquid and vapor service valve
ports to monitor operating pressures during and at
completion of the procedure.
2. Force system to operate in high stage by creating a large
differential between room temperature and set point on
thermostat.
Use multi-meter to verify that 24 VAC is
present between C and YI and Y2 terminals at outdoor unit.
3. Close the liquid service valve.
14
MAJOR
COMPONENTS
Variable
Speed
Compressor
This unit contains a variable speed rotary compressor
that has a
wide operating
range. It operates on a variable 3 phase sine wave
provided by the inverter. This compressor
can only be operated by
Variable speed Control Board
the specific
inverter
EQUIPMENT
supplied
with the unit.
DAMAGE
Failure
to follow this caution
and/or
improper
HAZARD
Do not attempt
to apply
compressor.
This will destroy
Electronic
may result in equipment
damage
operation.
Expansion
line voltage
directly
the compressor.
to
the
Valve (EXV)
This unit uses an electronic expansion valve for refrigerant
metering in the heating mode. The control board drives the EXV to
its proper position based on the operating mode and conditions.
The Infinity Touch Control Service mode allows for manual
opening and closing of the EXV for troubleshooting and pump
down.
Field
A13361
Fig. 19 - AOC
(Application
Operational
Control)
Board
control
For communicating operation use the communication Infinity plug
only. Only two wires, AB (color), are required. If necessary,
connect C for additional grounding (see Fig. 7). If using standard
2-stage HP thermostat, connect discrete inputs (R,C,Y2,Y1,O,W)
for 2-stage control in heating and cooling modes.
Pressure
The AOC board is located
tray. It's functions include:
in the lower
right hand side of inverter
• Compressor
speed control
• Outdoor fan motor control
• Reversing
• Defrost
valve operation
operation
• Crankcase
• Pressure
heater operation
switch monitoring
• Time Delays
• Pressure Transducer
• PEV control
• Temperature
valve)
control
Inverter
The inverter is located inside the control box. This is an air-cooled
device that communicates
with the control board and drives the
compressor
and fan motor to the demanded
RPM. The inverter is
always powered with line voltage since no contactor is used. The
The unit may be operated
or a standard
utilize
5
thermostat
2-stage
stages
of
HP thermostat.
heating
and
will only allow 2 discrete
with an Infinity
Infinity
cooling,
Equalizer
Valve (PEV)
The PEV is located next to the suction and discharge of the
compressor.
The function of this valve is to prevent the
compressor
from starting with a high refrigerant pressure
differential, thus helping the reliability of the compressor.
NOTE:
A hissing sound may be heard during the equalization
process. This is normal.
inverter changes the line voltage to DC volts and then recreates 3
phase sine waves that vary in frequency
to drive the compressor
and fan motor at the desired RPM.
NOTE:
(SPT)
At the end of every compressor operation (after the 3.5 minute
Time Guard period), the equalizer valve opens for 150 seconds
plus an additional 15 seconds of protection before allowing the
compressor to start ramping up.
measurements
• EXV (Electronic Expansion Valve) operation
• Inverter communication
and control
Transducer
A .5 VDC output low pressure transducer that provides a 0-.5 VDC
data for interpretation by the control board for a 0 to 200 psig
range of pressure at the suction tube. This interpreted pressure data
is then intelligently used by the AOC control board for low
pressure cut-out,
loss of charge management,
compressor
protection, oil circulation management, lubrication management
and EXV control.
Pressure
(pressure equalizer
measurements
Connections
Touch
Control
Touch
Control
will
while
2-stage
HP
stages of heating
and cooling
operation.
15
connect the C and D wires from the service tool to the two
ternfinals of the 120VAC to 24VAC adapter (0.5Amp minimum) as
shown in Fig. 20.
TROUBLESHOOTING
Systems
Communication
Failure
If communication is lost with the User Interface (UI), the control
will flash the appropriate fault code (see Table 7). Check the wiring
to the User Interface and the indoor and outdoor units and power.
Model Plu_
Each control board contains a model plug. The correct model plug
must be installed for the system to operate properly (see Table 4).
The model plug is used to identify the type and size of unit to the
control.
On new units, the model and serial numbers are inputted into the
AOC board s memory at the factory. If a model plug is lost or
nfissing at initial installation, the unit will operate according to the
information input at the factory and the appropriate error code will
flash temporarily. An RCD replacement AOC board contains no
model and serial information. If the factory control board fails, the
model plug must be transferred from the original board to the
replacement board for the unit to operate.
When the service tool is connected and powered up, the
communicating controls inside the home will "go to sleep" and let
the service tool take control of the system. In this manner, the
service technician can run the diagnostic checkouts right at the
outdoor unit using the service tool.
After the checkouts are completed and it is no longer necessary to
use the service tool, remove it from the communicating controls
and the indoor communicating controls will regain control in about
two nfinutes.
Pressure
1. Display the appropriate fault code (see Table 7).
2. After a 15 nfinute delay, if there is a call for cooling or heating and HPS is reset, the PEV opens for 150 seconds to
equalize system pressures. The compressor and fan will then
ramp to the next lower stage of operation until demand is
satisfied. In the next call for heating/cooling system will resume normal operation.
3. If the opened switch closes at any time after the 15 nfinute
delay, then the PEV opens for 150 seconds to equalize system pressures. The compressor and fan will then ramp to the
next lower stage of operation until demand is satisfied. In
the next call for heating/cooling system will resume normal
operation.
Table 4 - Factory Supplied Model Plug Information
MODEL PLUG
NUMBER
PIN RESISTANCE
(K-ohms)
Pins 1-4
HK70EZ001
5.1K
25VNA836
HK70EZ002
5.1K
18K
25VNA848
HK70EZ003
5.1K
24K
Service
4. If HPS trips 3 consecutive
locked out for 4 hours.
Pins 2-3
25VNA824
25VNA825
Protection
The outdoor unit is equipped with high pressure switch. If the
control senses the opening of a high pressure switch (open 600+/-5
psig, close 470+/-10 psig @77°F), it will respond as follows:
When installing heat pump with older fan coils, a model plug
change may be required. See table 2 for fan coils requiring model
plug change.
NOTE:
The model plug takes priority over factory model
information input at the factory. If the model plug is removed after
initial power up, the unit will operate according to the last valid
model plug installed, and flash the appropriate fault code
temporarily.
MODEL
NUMBER
Switch
cycles, the unit operation is
5. In the event of a high-pressure switch trip or high-pressure
lockout, check the refrigerant charge, outdoor fan operation,
and outdoor coil (in cooling) for airflow restrictions, or indoor airflow in heating.
11K
6. In the event of a low-pressure trip or low-pressure lockout,
check the refrigerant charge and indoor airflow (cooling)
and outdoor fan operation and outdoor coil in heating.
Control Fault
Tool
If the outdoor unit control board has failed, the control will flash
the appropriate fault code (see Table 7). The control board should
be replaced.
Brown- Out Protection
Connect
to
to 24vac
120VAC
(05A
rain )
adapter
A14178
Fig. 20 - Service Tool Connection
When working on the outdoor unit of a split system, the technician
would usually need to repeatedly walk between the indoor wall
control and the unit outside. To save time, the communicating
controls offer a service tool feature.
By wiring the service tool into the AOC board and powering it
with an external adapter, the technician can have a wall control
capable of running the system right at the outdoor unit.
To use a service tool, connect the A and B communication bus
wires from this second communicating control to the ternfinals
marked A and B on the ternfinal strip located in the bottom left
corner of the AOC board (see Fig. 20). But instead of connecting
the wires on the service tool to the ternfinals marked C and D,
If the line voltage is less than 187V for at least 4 seconds, the
Compressor and OD fan goes to 0 rpm. Compressor and fan
operation are not allowed until voltage is a nfinimum of 190V. The
control will flash the appropriate fault code (see Table 7).
230V Line (Power Disconnect)
Detection
The control board senses the presence of absence of 230V through
inverter feedback. Voltage should present at all times when system
is in service regardless if system is running or standby. If there is
no 230V at the inverter when the indoor unit is powered with a
cooling or heating demand, the appropriate fault code is displayed
on UI (communicating only - see Table 7). If system is configured
with conventional heat pump thermostat (non-communicating),
no
fault code will be displayed on AOC board, nor will any status
LEDs be lit. Use multimeter to check for the presence of 230V in
this situation.
Temperature
Thermistors
Thermistors are electronic devices which sense temperature. As the
temperature increases, the resistance decreases.
10Kohm
thermistors are used to sense outdoor air temperature (OAT), coil
temperature (OCT) and the suction line temperature (OST) located
between the reversing valve and the accumulator. A 50Kohm
thermistor is used to sense discharge temperature (ODT).
16
Refer
to
Table
5 and Fig. 21 and 22 for resistance
values
versus
temperature.
Table
5 - 10K/50Kohm
Resistance
Values
Failed
vs Temperature
RESISTANCE
(ohms)
25.0 (77.0)
10.0 + / - 2.3%
0.0 (32.0)
32.6 + / - 3.2%
-28.0 (-18.4)
85.5 + / - 3.4%
50Kohm
125.0 (257.0)
1.7 + / -
1.6%
75.0 (167.0)
7.40 + / - 2.0%
25.0 (77.0)
50.0 + / - 2.3%
THERMISTOR
90
I
I
I
_
I
_
L
I
I
I
I
I
I
_
I
T
±
I
I
I
I
I
I
•
I
I
I
•
I
_
•
I
I
I
I
I
40
60
80
100
80
I
70
d
60
50
40
30
20
Outdoor
(DEG.
Coil Thermistor
The outdoor coil thermistor is a 10Kohm resistor used for nmltiple
system operations, It provides the coil/liquid line temperature to
the heat pump board and user interface, Low ambient operation,
defrost initiation, defrost termination and assistance with OAT
temperature measurement of some of the functions. The sensor
must be securely mounted to the tube connecting the EXV and
distributor. See Fig. 24 for proper placement. See Table 5 for
proper resistances.
0
TEMPERATURE
Operation
Count the number of short and long flashes to determine the
appropriate flash code. Table 7 gives possible causes and actions
related to each error.
10
20
Default
If there is a thermistor out-of-range error, defrost will occur at
each time interval during heating operation, but will terminate after
2 minutes.
CURVE
I
Thermistor
Factory defaults have been provided in the event of failure of
outdoor air thermistor (OAT) and/or outdoor coil thermistor
(OCT).
If the OAT sensor should fail, defrost will be initiated based on coil
temperature and time.
If the OCT sensor should fail, defrost will occur at each time
interval during heating operation, but will terminate after 2
minutes.
10Kohm
°C (°F)
TEMPERATURE
The thermistor comparisons are not performed during low ambient
cooling or defrost operation,
120
F)
A91431
Fig. 21 - 10K Thermistor
Resistance Versus Temperature
50K THERMISTOR
450
• 400
OCT
3350
Sensor
Location
/
300
_ 2so
200
150
100
50
0
0
20
40
60
TEMPERATURE
80
100
120
(°F)
A14022
Fig. 22 - 50K Thermistor
Resistance Versus Temperature
A14302
Fig. 23 - Outdoor Coil Thermistor (OCT) Attachment
(On Distributor 1hbe)
If the outdoor air or coil thermistor should fail, the control will
flash the appropriate fault code (see Table 7).
IMPORTANT: The outdoor air thermistor, coil thermistor and
suction thermistor should be factory mounted in the final
locations, Check to ensure thermistors are mounted properly
(See Fig. 23, 24, 25 and 26).
Thermistor
Sensor
OAT Thermistor must be locked in place with
spherical nib end facing towards the front of
the control box\ \
.........
Comparison
The control continuously monitors and compares the outdoor air
temperature sensor and outdoor coil temperature sensor to ensure
proper operating conditions. The comparison is:
• In cooling if the outdoor air sensor indicates ->10 °F (->5.6 ° C)
warmer than the coil sensor (or) the outdoor air sensor indicates
->25°F (->15°C) cooler than the coil sensor, the sensors are out
of range.
• In heating if the outdoor air sensor indicates ->35 °F (-> 19.4 ° C)
warmer than the coil sensor (or) the outdoor air sensor indicates
->10°F (->5.6°C) cooler than the coil sensor, the sensors are out
of range.
If the sensors are out of range, the control will flash the appropriate
fault code as shown in Table 7.
,
f
_
--- ........
.... j/--_
Al1142
Fig. 24 - OAT Thermistor
17
Location (Bottom of Control Box)
Suction
Thermistor
Variable Speed Compressor Winding Resistance
(OST)
Suction Thermistor is used for assisting in EXV control and must
be secured on the suction tube and aligned longitudinally to the
vertical surface of the tube axis (see Fig. 25).
This compressor operates with 3-phase variable frequency
PWM
variable voltage. For troubleshooting
certain fault codes related to
compressor
resistances, follow these steps:
1. Disconnect
compressor
terminals,
UNIT
DAMAGE
Failure
damage
U (YEL),
2. Measure
HAZARD
to follow this caution
or improper operation.
may
result
power
leads from the inverter
V (RED),
and W (BLK).
between
YEL to RED,
the resistance
and RED to BLK and compare
resistance set should be equal.
in equipment
3. Measure
In order to minimize the ambient influence, make sure the
thermistor
curved surface
hugs the pipe surface
and is
secured tight using the wire tie fished through the original
slot insulating polymer body.
the resistance
4. If the
resistances
appropriate
to ground
check
out,
YEL to BLK,
6 values.
to measure
appear
for each lead.
reconnect
to be abnormal,
the resistance
the removal
power
leads
to
it will be necessary
at the compressor
of the compressor
fusite terminals.
fusite cap, do not re-
move the RTV sealant. Remove the harness
the resistances, and compare to Table 6.
7. Special
Each
terminal.
5. If the resistances
6. During
to Table
MOC
plug,
measure
care will need to be taken with the replacement
of
the compressor
fusite cap. Make sure the two holes in the
compressor
fusite terminal box are still full of RTV sealant
before the cap is reinstalled. The factory RTV can be reused
as long
removal.
ii
...........
as none
of it has been
removed
during
the cap
8. Reinstall compressor
sound blanket making sure discharge
thermistor and compressor
power harness are routed as they
were from the factory
Table
6 - Variable
(winding
A14023
Fig. 25 - Suction
Thermistor
(On Suction
Discharge
Thermistor
(OST)
Compressor
at 70°F
Between terminals
24
25
36
48
0.59
OHM
0.59
OHM
0.59
OHM
0.37
OHM
Between terminal
& ground
(ODT)
Resistance
:t= 20°F)
MODEL 25VNA8
WINDING
Attachment
Tube)
Speed
resistance
>1 mega OHM
Discharge Thermistor is used for protection against over
temperature of the compressor.
The ODT is located on the
compressor discharge stub-out (see Fig. 26).
[]NIT
/
:(t;
}
DAMAGE
HAZARD
i
Failure to follow this caution
and/or improper operation.
Do not use Meggar
UNIT
DAMAGE
for measuring
the winding
damage
resistance.
HAZARD
Failure to follow this caution
and/or improper operation.
To maintain
may result in equipment
water
integrity
may result in equipment
of the compressor
fusite
damage
terminal
box, the two holes in outer ring need to be full of RTV sealant.
A14024
Fig. 26 - Discharge
Thermistor
(ODT)
Fan Motor
If verification
of proper operation
used in this unit, follow these steps:
1. Disconnect
2. Measure
3. Compare
is required
fan motor connector
resistance
between
measurement
for the fan motor
from control
board.
any 2 of the 3 leads present.
to values
below
Fan Motor Resistance
Unit Size
24, 25,
18
36, 48
Resistance (Ohms)
11.1
Status
EXAMPLE:
Codes
Table 7 shows the status codes flashed
Most system problems can be diagnosed
as flashed
by the amber status
The codes are flashed
by the amber status light.
by reading the status code
Utility
light on the control board.
by a series of short
and long flashes
of the
status light. The short flashes indicate the first digit in the status
code, followed by long flashes indicating
the second digit of the
error code.
The short flash is 0.25 seconds ON and the long flash is 1.0 second
ON. Time between flashes is 0.25 seconds.
Time between short
flash
and first
repeating
Codes
long
flash
is 2.5 seconds
is 1.0
second.
Time
between
3 short flashes followed
by 2 long
Table 7 shows this to be low pressure
code
Interface
With
Infinity
flashes indicates
switch open.
Touch
a 32 code.
Control
The utility curtailment relay should be wired between
UTIL
connections
on the control
board
for this
the two
Infinity
Communicating
System (see Fig. 27). This input allows a power
utility device to interrupt compressor
operation
during peak load
periods. When the utility sends a signal to shut the system down,
the User Interface
See UI installation
status screen will display, "Curtailment
instructions
for setup details.
Yes".
with LED OFF.
are easily read from user interface
(UI)
Utility Relay
A13414
Fig. 27 - Variable
Speed
Control
Board
19
with
optional
Utility
Relay
Table 7 - Troubleshooting
RESET TiME
(Minimum)
Minutes
AMBER LED DESCRIPTION
Standby
Variable
ON,noflash
Capacity
Mode
1,pause
Variable
Speed
Range
Cutback
Communications
Loss
Invalid Model
1(2sec
ON),
bnger
pause
(1second
OFF)
"
16
25
N/A
N/A
31
32
45
46
48
15
15
N/A
6
6
49
52
6
N/A
OutdoorAir Temp Sensor Fault
Suction Temp Sensor Fault
53
54
N/A
N/A
Coil Temp Sensor Fault
OAT-OCT Thermistor Out of Range
Suction Pressure Sensor Fault
55
56
57
N/A
N/A
15
SuctionThermistor
Range Fault
Discharge Temperature Out of RangeEvent
Fan Inverter Fault
58
59
61
N/A
15
6
Fan Inverter Temp High
Fan Inverter Over Current
62
63
6
6
D C Voltage Low Fault
Outdoor Fan Dropped Out
Stator Heater Fault
65
66
67
6
6
6
Inverter / Compressor Internal Fault
Compressor Dropped Out
69
71
15
6
Suction Over Temperature Event
Discharge Temp Out of Range Lockout
72
74
15
2 Hours
Maximum Power Mode-Temp
Fan Inverter Lockout
75
76
N/A
2 Hours
Maximum Power Mode-Comp Current
Compressor/Inverter
Fault
Suction Over Temp Lockout
Low Pressure Lockout for 4 hours
77
79
82
83
N/A
15
4 Hours
4 Hours
High Pressure Lockout for 4 hours
84
4 Hours
Fan Inverter Temp Lockout
Fan Inverter Current Lockout
85
86
15
15
Inverter Temp Lockout
88
2 Hours
Compressor Inverter Overcurrent Lockout
Inverter VDC-Out Over Voltage Event
Inverter VDC-Out Under Voltage Event
230VAC Under Voltage Event
89
91
92
93
15
15
15
15
230VAC Over Voltage Event
High Current Lockout
94
95
15
2 Hours
VDC Under Voltage Lockout
96
2 Hours
VDC Over Voltage Lockout
High Torque Event
High Torque Lockout
--
97
98
99
OFF
2 Hours
10
2 Hours
N/A
High Pressure Switch Open
Low Pressure Trip
Control Fault
Brownout Event
Lost Inverter Communication
230VAC Dropout-Reset Event
-Outdoor Discharge Temp Sensor Fault
* Short Flashes indicate the first digit in
the status code followed by long flashes
indicating the second digit of the status code.
\
340326o101 REV. E
20
FINAL
IMPORTANT:
Before
CHECKS
leaving
job,
CARE
be sure
to do
the
For
1. Ensure that all wiring is routed away from tubing
and sheet metal edges to prevent rub-through
or
that all wiring
3. Tighten service
finger tight.
and tubing
is secure
in unit
and covers.
Securely
fasten
valve stem caps to 1/12-turn
performance
and
to
minimize
maintenance
must be
Frequency
of maintenance
may vary depending
geographic
areas, such
as coastal
applications.
Owner's Manual for information.
wire pinching.
before adding panels
all panels and covers.
high
MAINTENANCE
possible equipment
failure, periodic
performed
on this equipment.
following:
2. Ensure
continuing
AND
upon
See
past
4. Leave User's Manual with owner. Explain system
operation
and periodic maintenance
requirements
outlined in manual.
5. Fill out Dealer
customer file.
Installation
Checklist
PURON®
• Puron
refrigerant
components
• Puron
are designed
refrigerant
• Recovery
• Puron
operates
cylinder
when charging
• Manifold
(R-410A)
at 50-70
to operate
cylinders
service
refrigerant
systems
• Leak detectors
percent
higher
with Puron
pumps
pressures
pressure
should
pressure
be designed
refrigerant
moisture
equipment
and replacement
or DOT BW400.
Use a commercial
type metering
device
in the manifold
hose
retard.
rating.
to detect HFC refrigerant.
moisture
suction
with POE oils.
from oil.
line filter driers
pressures
less than 600 psig.
in line longer
than 72 hours.
filter drier in liquid-line.
rapidly.
• POE oils may cause damage
Do not expose
oil to atmosphere.
to certain plastics and roofing
• Wrap all filter driers
and service
valves
• A factory-approved
liquid-line
filter drier is required
• Do NOT use an R-22
GUIDE
operating.
filter driers with rated working
• Do not install a suction-line
• If indoor
Be sure that servicing
rating must be 400 psig, DOT 4BA400
be charged with liquid refrigerant.
will not remove
• Do not use liquid-line
• POE oils absorb
than R-22.
REFERENCE
refrigerant.
as with other HFCs, is only compatible
• Do not leave Puron
QUICK
be 700 psig high side and 180 psig low side with 550 psig low-side
should
refrigerant,
• Vacuum
REFRIGERANT
into suction line with compressor
sets should
in
are rose colored.
• Use hoses with 700 psig service
• Puron
and place
materials.
with wet cloth when brazing.
on every unit.
TXV.
unit is equipped
with an R-22
TXV or piston metering
device, it must be changed
to a hard-shutoff
Puron refrigerant
TXV.
• Never open system
• When system
driers. Evacuate
to atmosphere
must be opened
refrigerant
• Do not use capillary
• Observe
• All indoor
for service,
to 500 microns
• Do not vent Puron
all warnings,
while it is under
recover
a vacuum.
refrigerant,
evacuate
then break vacuum
with dry nitrogen
prior to recharging.
into the atmosphere.
tube coils.
cautions,
coils must be installed
and bold text.
with a hard-shutoff
Puron
refrigerant
TXV metering
21
device.
and replace
filter
Copyright
2014 Carrier Corp. • 7310 W. Morris
Manufacturer
reserves
the right to change,
St. • Indianapolis,
IN 46231
at any time, specification8
and design8
Edition
without
Date: 05/14
notice and without
22
obligations,
Catalog No: 25VNA8-2SI
Replaces:
25VNAS-
lSl
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