25VNA8---6SI
25VNA8
Infinityr 18VS Variable Speed Heat Pump
with Puronr Refrigerant
Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
TABLE OF CONTENTS
PAGE NO.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 1 — Check Equipment and Job site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 2 — Install on Solid, Level Mounting Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 3 — Clearance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 4 — Operating Ambient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 5 — Elevate Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 6 — Making Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 7 — Make Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 8 — Compressor Internal Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 9 — Install Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 10 — Start--Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 11 — System Functions and Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 12 — Check Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 13 — Pumpdown & Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
MAJOR COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FINAL CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
PURONr REFRIGERANT QUICK REFERENCE GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Replaces: 25VNA8--- 5SI
Indoor Thermostat Control Options
IMPORTANT: Effective January 1, 2015, all split system and
packaged air conditioners must be installed pursuant to applicable
regional efficiency standards issued by the Department of Energy.
Information in these installation instructions pertains only to
25VNA8 series units.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
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
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these 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.
Infinity Touch
Control
Standard
HP Thermostat
25VNA8
Yes*
Yes**
* Requires model SYSTXCCITC01, SYSTXCCITW01 or SYSTXCCITN01
with version 11 software or newer.
* Version 12 software or newer required for model size 13.
** Using standard HP thermostat limits functionality of system.
!
WARNING
ELECTRICAL HAZARD -- HIGH VOLTAGE!
Failure to follow this warning could result in personal injury
or death.
Electrical components may hold charge. DO NOT remove
control box cover for 2 minutes after power has been
removed from unit.
PRIOR TO TOUCHING ELECTRICAL COMPONENTS:
Verify zero (0) voltage at inverter connections shown on
inverter cover.
!!
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
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 result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or operation.
!
Model
!
WARNING
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
CAUTION
CUT HAZARD
Inverter Cover
Failure to follow this caution may result in personal injury.
IMPORTANT: The inverter cover should NEVER be removed
because there is no reason to remove the inverter cover to access
the inverter. The inverter has limited serviceability. Refer to
Service Manual for details on field replaceable parts.
A
replacement cover is provided with a replacement inverter.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.
!
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury
or equipment damage.
PuronR refrigerant systems operate at higher pressures than
standard R--22 systems. Do not use R--22 service equipment
or components on PuronR refrigerant equipment.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
INSTALLATION RECOMMENDATIONS
In some cases noise in the living area has been traced to gas
pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.
2. In noise sensitive applications (such as bedrooms), when a
lineset is mounted to ceiling joists or floor joists, the outdoor unit must be located at least 10 ft (3.05 m) away. If
this is not possible, create a line set configuration with
enough bends to provide 10 ft (3.05 m) of total line set
length outside the dwelling
3. Ensure that vapor and liquid tube diameters are appropriate
for unit capacity.
4. Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.
5. Leave some slack between structure and unit to absorb vibration.
6. When passing refrigerant tubes through the wall, seal opening with RTV or other pliable silicon--based caulk (see Fig.
1).
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2
Replaces: 25VNA8--- 5SI
7. Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, and walls.
8. Do not suspend refrigerant tubing from joists and studs with
a rigid wire or strap which comes in direct contact with tubing (see Fig. 1).
9. Ensure that tubing insulation is pliable and completely surrounds vapor tube.
10. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 1.)
11. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
12. If these installation recommendations were not followed,
gas pulsation may be transmitted through improperly
mounted line sets. In this case, an external vapor line muffler accessory (part no. LM10KK003) is available to minimize noise due to gas pulsations.
!
CAUTION
INSTALLATION
Specifications for this unit in residential new construction market
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
Conditioners and Heat Pumps Using Puron Refrigerant to obtain
required unit changes for specific applications and for R--22
retrofit.
Step 1 — Check Equipment and Job Site
Unpack Unit
Move to final location. Remove carton taking care not to damage
unit.
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 at the approximate
center of each side (See Fig. 2). This louver spacer should be
present and, if dislodged during shipment, must be reinstalled
before unit is placed into operation.
EQUIPMENT DAMAGE HAZARD
Failure 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.
OUTDOOR WALL
INDOOR WALL
CAULK
LIQUID TUBE
SUCTION TUBE
INSULATION
THROUGH THE WALL
JOIST
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
INSULATION
SUCTION TUBE
A11380a
Fig. 2 -- Louver Spacer Location
1” (25.4 mm)
MIN
LIQUID TUBE
Inspect Equipment
SUSPENSION
A07588
Fig. 1 -- Connecting Tubing Installation
The outdoor unit contains the correct amount of refrigerant charge
for operation with AHRI rated indoor units when connected by 15
ft (4.57 m) of field--supplied or factory accessory tubing.
Adjust refrigerant charge by adding or removing the charge
to/from the unit depending on lineset length and indoor unit as
calculated and displayed on the UI. The user interface (UI)
calculates required charge adjustment and total system charge
required. For proper unit operation, check refrigerant charge using
charging information in the Check Charge section of this
instruction.
IMPORTANT: Liquid--line size is 3/8--in. OD for all 25VNA8
applications. The maximum allowable equivalent line set length is
100 ft. (30.5 m).
IMPORTANT: Always install the factory--supplied liquid--line
filter drier. Obtain replacement filter driers from your distributor or
branch.
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.
Step 2 — Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig. 3
to determine base pan size and knockout hole location.
For hurricane tie downs, contact distributor for details and PE
(Professional Engineer) Certification, if required.
On rooftop applications, mount on level platform or frame. Place
unit above a load--bearing wall and isolate unit and tubing set from
structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may require
wind baffles. Consult the Service Manual -- Residential Split
System Air Conditioners and Heat Pumps Using Puron
Refrigerant for wind baffle construction.
NOTE: Unit must be level to within 2 (3/8 in./ft,9.5 mm/m.)
per compressor manufacturer specifications.
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
Replaces: 25VNA8--- 5SI
Step 3 — Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 24 in. (609.6 mm)
clearance to service end of unit and 48 in. (1219.2 mm) (above
unit. For proper airflow, a 6--in. (152.4 mm) clearance on 1 side of
unit and 12--in. (304.8 mm) on all remaining sides must be
maintained. Maintain a distance of 24 in. (609.6 mm) between
units. Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
On rooftop applications, locate unit at least 6 in. (152.4 mm) above
roof surface.
!
CAUTION
UNIT 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.
Step 6 — Make Piping Connections
WARNING
!
3/8--- in. (9.53 mm) Dia.
Tie--- down Knockouts in
Basepan(2) Places
PERSONAL INJURY AND UNIT DAMAGE
HAZARD
Failure to follow this warning could result in personal injury 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.
!
View From Top
A05177
UNIT BASE PAN
Dimension in. (mm)
23 X 23
(596 X 596)
31.2 X 31.2
(792 X 792)
TIEDOWN KNOCKOUT LOCATIONS in. (mm)
A
B
C
7 ---13/16 (198)
4 ---7/16 (102)
18 ---1/8 (458)
9 ---1/8 (232)
6 ---9/16 (167)
24 ---11/16 (627)
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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.
Fig. 3 -- Tie--down Knockout Locations
Step 4 — Operating Ambient
The minimum outdoor operating ambient in cooling mode is 40_F
(4.4_C) with Infinity Touch Control, 55_F (12.8_C) with
non--communicating 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_C). Compressor protections will prevent starting below 10_F
(--12.2_C) and operation below 2_F (--16.7_C).
Step 5 — Elevate Unit
Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit.
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
CAUTION
!
CAUTION
UNIT 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
mm) vertical rise at service valve. Refrigerant tubing lengths
up to 36 in. (914.4 mm) may be buried without further
special consideration. Do not bury lines longer than 36 in.
(914.4 mm).
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 ft (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.
Do not allow water and/or ice to build up in base pan.
Table 1 – Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (in.)
LIQUID
UNIT SIZE
13, 24B
25
36
37
48
60
Connection
Diameter
3/8
3/8
3/8
3/8
3/8
3/8
Tube
Diameter
3/8
3/8
3/8
3/8
3/8
3/8
Connection
Diameter
3/4
3/4
3/4
7/8
7/8
7/8
VAPOR†
Max (Rated)
Diameter
3/4
7/8
7/8
7/8
(1 ---1/8)
(1 ---1/8)
Minimum
Tube Diameter
5/8
5/8
5/8
5/8
3/4
3/4
* *24A unit height is 38--- 7/16”, 24B unit height is 31--- 5/8
{ Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for performance data when using different size and length line sets.
Notes:
1. Do not apply capillary tube indoor coils to these units.
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
Replaces: 25VNA8--- 5SI
Outdoor Unit Connected to Factory-- Approved Indoor
Unit
Sweat Connections
Install Liquid-- Line Filter Drier Indoor
Refer to Fig. 4 and install filter drier as follows:
1. Braze 5--in. (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5--in. (127 mm) liquid tube.
4. Connect and braze liquid refrigerant tube to the filter drier.
!
CAUTION
!
Outdoor unit contains correct system refrigerant charge for
operation with factory--approved, AHRI--rated indoor 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: If the indoor furnace coil width is more than the furnace
casing width, refer to the indoor coil Installation Instructions for
transition requirements.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
S Use a brazing shield
S Wrap service valves with wet cloth or heat sink material.
Use refrigerant grade tubing. Service valves are closed 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
and indoor coil are now ready for leak testing. This check should
include all field and factory joints.
Evacuate Refrigerant Tubing and Indoor Coil
CAUTION
CAUTION
!
UNIT DAMAGE HAZARD
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage or
improper operation.
Failure to follow this caution may result in equipment
damage or improper operation.
Installation 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 evacuation method may be used. See Service Manual for
triple evacuation method. Always break a vacuum with dry
nitrogen prior to opening the refrigerant system for servicing.
Deep Vacuum Method
The deep 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 positive way of assuring a system is free of air and
liquid water. (See Fig. 5)
5000
4500
4000
3500
3000
2500
Fig. 4 -- Liquid--Line Filter Drier
Refrigerant Tubing connection Outdoor
Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 1).
LEAK IN
SYSTEM
MICRONS
A05227
2000
1500
1000
No Installation of Adapter Tube
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.
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
500
0
1
2
3
4
5
MINUTES
6
7
A95424
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.
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
5
Replaces: 25VNA8--- 5SI
Step 7 — Make Electrical Connections
Connect Infinity Control Wiring
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not supply power to unit with compressor terminal box
cover removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits 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
permissible limits.
NOTE: Use copper wire only between disconnect switch and unit.
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.
Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
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 Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 6.
Connect to Infinity connections. Only two wires (AB) or (GN,YL)
to Infinity capable indoor unit (furnace or fan coil) are required.
Connecting C (WT) is recommended if wires are available (see Fig.
7). This will reduce the chance of communication issues. Unused
low voltage wires should be bundled together and terminated with
a wire nut at each end. The end nearest the indoor coil should be
connected to C terminal.
IMPORTANT: This system requires the power supplied to the
outdoor unit, and the indoor unit, for the wall control to
communicate with the outdoor unit.
Connect Control Wiring-- Non-- Communicating
4 wires are required when connecting 25VNA8 models to
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
control, disconnect the green (GN) and yellow (YL) wires from
4--pin green communication plug and connect appropriate wires to
low voltage terminal block. Use wire nuts to attach thermostat
wire to LVCH harness.
General Information
Use 18--20 solid AWG color--coded, insulated (35_C minimum)
wire for low voltage control wires. All wiring must be NEC Class
2 and must be separated from incoming power leads.
Installations using greater than 200 feet of low voltage wiring
should consult the Infinity wall control manual for additional
guidelines regarding daisy chaining wiring method and terminating
resistors. Never route control wiring in parallel to high voltage
power wires when possible as electrical noise may transfer and
generate nuisance fault codes. Where low voltage control and high
voltage wires must cross paths, do so at perpendicular angles to
eliminate transferred noise.
If further communication issues exist, consider using shielded low
voltage wires and only connect shielding to C terminal at end
nearest indoor coil. Use 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 power.
Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections to
ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
Unused Wires
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
TERMINAL
BLOCK
Furnace or Fan Coil
Wall Control
WIRING
D
D
C
C
B
B
YL
A
A
GN
WT
D not required
’C’ connection optional
OAT
FIELD GROUND
GROUND
LUG
R
WIRING
HP or AC
Sheild Cable
FIELD POWER
Y
A14028
Fig. 6 -- Line Power Connections
C
HUM
24vac C
W
Humidifier
O
!
A150776
Fig. 7 -- Infinity Furnace or Fan Coil Wiring with
Communicating Variable Speed HP
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
6
Replaces: 25VNA8--- 5SI
Thermidistat
Fan Coil
O
RVS Cooling
O/B W2
W1
Heat Pump
O
W1
J2 Jumper
on Control Board
Heat Stage 3
W/W1
W2
Heat/Cool Stage 1
Y1 / W2
Y1
Y1
Heat/Cool Stage 2
Y/Y2
Y/Y2
Y2
Fan
G
G
24VAC Hot Heating
Rh
R
24VAC Hot Cooling
Rc
Dry Contact 1
D1
Dry Contact 2
D2
DH
24VAC Common
C
C
Humidify
HUM
Outdoor Air Temp
OAT
Remote Room Sensor
RRS
OAT/RRS Com
SRTN
Jumper Wire
Required for
Single-Stage
R
J1 Jumper
on Control Board
C
Humidifier Solenoid
Valve
Outdoor Sensor
Remote Room
Sensor
A14269
Thermidistat
Furnace
Heat Pump
O
RVS Cooling
O/B W2
W2
Heat Stage 3 (furnace)
W/W1
W/W1
W1
Heat/Cool Stage 1
Y1 / W2
Y1
Y1
Heat/Cool Stage 2
Y/Y2
Y/Y2
Y2
Fan
G
G
24VAC Hot Heating
Rh
R
24VAC Hot Cooling
Rc
Dry Contact 1
D1
Dry Contact 2
D2
DHUM
24VAC Common
C
COM
Humidify
HUM
Outdoor Air Temp
OAT
Remote Room Sensor
RRS
OAT/RRS Com
SRTN
Jumper Wire
Required for
Single-Stage
R
J1 Jumper
on Control Board
C
Humidifier Solenoid
Valve
Outdoor Sensor
Remote Room
Sensor
Fig. 8 -- Low Voltage Wiring (Non--Communicating)
A14029
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
7
Replaces: 25VNA8--- 5SI
Step 8 — Compressor Crankcase Heater
Step 9 — Install Accessories
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.
Upon initial start--up of unit, status code 68 will be generated and
system will operate at stage 2 for 11 minutes. This operation is
important to system reliability and cannot be bypassed. Each time
high voltage is removed and reapplied this behavior will be
repeated.
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.
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.
Airflow Setup for Infinity Touch Control Furnace
or FE Fan Coil (communicating)
This system can only be installed with Infinity--capable indoor and
Infinity Touch User Interface (UI) SYSTXCCITC01,
SYSTXCCITW01 or SYSTXCCITN01 with version 11 software
or newer. Version 12 or newer software required on model size 13.
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.
Fig. 9 -- Recommended Support Feet Location
(for 23” x 23” basepan)
Step 10 — Start--Up
!
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 system safety
devices such as discharge thermistor or the high pressure
switch.
4.Dome temperatures may be hot.
5.Discharge thermistor is engaged tight on the discharge tube.
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.
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.
NOTE: 25VNA813 is AHRI rated with communicating indoor
units only due to low stage airflow requirements.
Table 2 – Alternate Model Plug
24
25
36
48
60
CAUTION
UNIT OPERATION AND SAFETY HAZARD
Airflow Setup for Non--communicating Fan Coil
25VNA8
A14008
!
CAUTION
PERSONAL INJURY HAZARD
FV4(A,B), FK4, 40FK Fan Coil Models*
(Requires outdoor model plug change)
Factory
Required Accessory
Model Plug #
Model Plug #
HK70EZ***
HK70EZ***
009
015
001
016
002
017
003
018
004
019
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant.
!
CAUTION
ENVIRONMENTAL HAZARD
* FK4 and 40FK also require a TXV change. See accessory list for approved TXV.
Failure to follow this caution may result in environmental
damage.
Airflow Setup for Non--communicating 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.
Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
8
Replaces: 25VNA8--- 5SI
Follow these steps to properly start up the system:
1. After system is evacuated, close the disconnects to energize
indoor unit, outdoor unit, and User Interface (UI). Do not
attempt to operate the system in heating or cooling mode at
this time. Mode: OFF.
2. Navigate to the service area by pressing MENU from main
screen. Scroll down to service icon and hold until icon
turns green. Once in the Installation and Service menu, select Refrigerant Charging, then select Charging Cooling.
A14569
Fig. 10 -- Service Icon
A14566
A14570
Fig. 13 -- Select Line Set Length & Vapor Line Diameter
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper unit
operation.
For new installations only. Add additional refrigerant due to
indoor coil, line set, and vapor line settings. Outdoor unit is
pre--charged with weight of refrigerant shown on rating plate.
Fig. 11 -- Select Refrigerant Charging
A14567
A14571
Fig. 14 -- Weigh In Value
Fig. 12 -- Select Charging Subcooling
4. Add additional required charge for line set and indoor coil
size then fully open liquid and vapor service valves. If lineset is less than 15 feet (4.57 m) in length, charge removal
may be necessary and will be shown as a negative number
on UI screen. UI screen displays charge in lb and oz, while
unit rating plate is in decimal format.
A14568
3. If installed indoor unit is a furnace coil, model should have
been selected manually during the initial discovery process.
Press the text “line set” and “vapor line” to choose line set
length and vapor line diameter. After complete, press “next”
to advance to next screen. The “weigh in” value is the total
charge weight and includes refrigerant shipped in unit. If
“weigh in” text is selected the additional charge required is
broken down into the line set adder and indoor coil size
adder.
Factory Charge
Coil & Lineset
Additional Charge
Required
Fig. 15 -- Additional Required Charge
A14572
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
9
Replaces: 25VNA8--- 5SI
Step 11 — System Functions and Sequence of
Operation
The 25VNA8 models utilize either Infinity Touch Communicating
User Interface (UI) or conventional HP thermostat. When using UI
controls, a call for cooling will energize the outdoor 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, Y1, 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 unit
control board (the most recent, with the highest priority). The
latest codes are stored and can be accessed via the UI.
Upon a call for cooling through the UI (or the Y1 and/or Y2
connections in a non--communicating system), the Application
Operation Control (AOC) board (see Fig. 34) 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.
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 3.5 minute 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 minute Time Guard can be bypassed by momentarily
shorting the Forced Defrost pins. Only the 3.5 minute time delay
can be bypassed. Because it is important for compressor reliability,
the 150--second PEV delay cannot be bypassed.
Crankcase Heater Operation
This unit has an internal crankcase heater that will be energized
during the off cycle and is intelligently demanded by the system to
prevent the compressor from being the coldest part of the system
thus enhancing the reliability. The crankcase heater will function
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 properly.
The 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
The outdoor unit control (Fig. 16) 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 and the cooling or heating capacity required.
Time Delays
The unit time delays include:
S 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.
S 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.
S 15 second delay at termination of defrost before the auxiliary
heat is de--energized.
S See Table 7 for other delay information.
Communication and Status Function Lights
Infinity Touch Control, Green Communications
(COMM)Light
A green LED (COMM light) on the outdoor board (see Fig. 16)
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 communication is received within 2
minutes, the LED will be turned OFF until the next valid
communication. The green LED will be turned off when using a
standard 2--stage non--communicating heat pump thermostat.
Amber Status Light
Amber colored STATUS light indicates operation and error status.
See Table 7 for definitions.
S Two minute time delay to return to standby operation from last
valid communication.
Defrost
This user interface (UI) offers 5 possible defrost interval times: 30,
60 and 90 minutes, or AUTO. The default is AUTO.
Defrost interval times: 30, 60, and 90 minutes or 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 37 degrees. The 120 minute selection will default
to 90 minutes at ambient above 37 degrees.
If using non--communicating thermostat, defrost intervals are set
using dip switches on outdoor control board (see Fig. 16). AUTO
defrosts adjusts the defrost interval time based on the last defrost
time as follows:
S When defrost time <5 minutes, the next defrost interval=90
minutes. (outdoor temperature above 37_F)
S When defrost time 5--7 minutes, the next defrost interval=60
minutes.
S When defrost time >7 minutes, the next defrost interval=30
minutes.
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
10
Replaces: 25VNA8--- 5SI
A14021
Fig. 16 -- AOC Control Board
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.
Charging using the subcooling method optimizes charge volume
and is preferred if possible. If the outdoor temperature is between
65_F -- 100_F (18.3_C -- 37.8_C) and indoor temperature is 70_F
-- 80_F (21.1_C -- 26.7_C), the option to further adjust charge
using “service valve subcool” will be available in the “charging
mode selection” screen. If temperatures are outside of range, this
option will be greyed out and not selectable. Inaccurate charging
may result in nuisance fault codes.
Initial start--up can be performed using calculated charge only and
once conditions are within range, the ”Service Valve Subcool”
option will become selectable.
Once start is selected the system will operate in a preset mode until
“done” is selected. Wait for required stabilization time then check
subcooling at service valve.
Adjust charge as required to meet target service valve subcooling
shown on screen +0/--3 degrees for tolerance. If any adjustment is
necessary, add or remove the charge slowly (no greater than .5 lb
per minute) and allow system to operate for 25 minutes to stabilize,
before declaring a properly charged system.
The control board accumulates compressor run time. As the
accumulated run time approaches the selected defrost 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) within the interval, the interval timer will be reset and start
over.
S Upon initial power up the first defrost interval is defaulted to 30
minutes. Remaining intervals are at selected times.
S Defrost is only allowed to occur below 50_F (10_C) outdoor
ambient temperature.
The defrost cycle is terminated as described below.
S 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.
S When OAT ≥ 25_F (+3.89_C), defrost will terminate if OCT is
>45_F (+4.4_C) and a minimum of 2 minutes defrost length.
S Or 10 minutes has passed.
At the defrost termination, the outdoor fan will turn on 10 seconds
before the reversing valve switching.
NOTE: Compressor speed during defrost will go to defrost speed.
A14573
Fig. 17 -- Adjusting Charge Using Service Valve Subcool
Step 12 — Check Charge
Charge in CHARGING mode (communicating only)
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 or indoor coil, 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).
Fig. 18 -- Service Valve Subcool Target Value
Fig. 19 -- Stabilization Time
A14574
A14575
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
11
Replaces: 25VNA8--- 5SI
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, Y1 /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. 21 -- 26 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 80ft (24.38 m) or greater than
20ft (6.10 m) vertical separation see Long line guideline for special
charging requirement.
Fig. 22 -- Charging in Cooling Mode 25VNA825
Fig. 23 -- Charging in Cooling Mode 25VNA836
Fig. 24 -- Charging in Cooling Mode 25VNA837
Fig. 20 -- Charging in Cooling Mode 25VNA813
Fig. 25 -- Charging in Cooling Mode 25VNA848
Fig. 21 -- Charging in Cooling Mode 25VNA824
Fig. 26 -- Charging in Cooling Mode 25VNA860
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
12
Replaces: 25VNA8--- 5SI
Heating Check Chart Procedure (See Fig.29 - 32)
(Communicating / Non-- communicating Systems)
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. 29, 30 or 32 based the OD unit
size.
To use the Heating Check Chart in non--communicating systems,
operate system at Y1+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.
NOTE: High pressure is at vapor service valve. Add 12 psig if
high pressure is taken from liquid service valve.
NOTE: When charging is necessary during heating season, charge
must be weighed in accordance with unit rating plate, ±0.6 oz./ft
(±17.74 g/m). of 3/8--in. liquid--line above or below 15 ft (4.57
m), respectively.
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/ft (17.74 g/m) of 3/8 liquid line above or below
15ft (4.57 m) respectively.
Use the Defrost CHECKOUT mode to remove ice or frost from
coil, if present, prior to checking the heating 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
Table 3 – Required Charge Adjustment for Indoor Coil Model
Furnace or Fan Coil Model
Number
13
24B
25
36
37
48
60
CNPV*18**
---
/
/
/
/
/
/
CAP**18**
---
/
/
/
/
/
/
CNP**24
---
/
/
/
/
/
/
CNPV*19**
---
/
/
/
/
/
/
CAP**24
---
/
/
/
/
/
/
CSPH*24
---
/
/
/
/
/
/
CSPH*30**
/
/
/
/
/
/
/
F(E,V)4(A,B,C)NF002
+0.19
---
---
---
---
/
/
CAP**30
/
---
/
/
/
/
/
CNP**30
/
---
/
/
/
/
/
CNP**36
/
---
---
---
---
/
/
F(E,V)4(A,B,C)N(B,F)003
/
---
---
---
---
/
/
CAP**36
/
---
---
---
---
/
/
CNP**42
/
+.50
---
---
+.75
/
/
CAP**42
/
+.50
---
---
+.75
/
/
CSPH*36
/
/
---
---
+.75
/
/
CSPH*42**
/
/
+.75
+.75
+.75
/
/
CNP**31**
/
/
+.75
+.75
+.75
/
/
CNP**48
/
/
+.75
+.75
+.75
---
/
CSPH*48**
/
/
+.75
+.75
+1.00
---
/
CNP**37
/
/
/
/
/
/
/
CNP**43
/
/
/
/
/
/
/
CAP**48
/
/
/
+.75
+1.00
---
/
CNP**60
/
/
/
/
+1.00
---
-----
CSPH*60
/
/
/
/
+1.00
---
F(E,V)4(A,B,C)N(B,F)005
/
/
+.75
+.75
+1.00
---
/
F(E,V)4(A,B,C)NB006
/
/
/
/
+1.00
+2.2
+1.00
CAP**60
/
/
/
/
/
+2.2
+1.00
/
/
/
/
/
/
/
/
---
CNP**61
= Comb. not allowed
= No charge adjust for ID
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
13
Replaces: 25VNA8--- 5SI
Fig. 27 -- Heating Pressure Check Chart 25VNA813
Fig. 31 -- Heating Pressure Check Chart 25VNA837
Fig. 28 -- Heating Pressure Check Chart 25VNA824
Fig. 32 -- Heating Pressure Check Chart 25VNA848
Fig. 29 -- Heating Pressure Check Chart 25VNA825
Fig. 33 -- Heating Pressure Check Chart 25VNA860
Fig. 30 -- Heating Pressure Check Chart 25VNA836
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
14
Replaces: 25VNA8--- 5SI
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.
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.
CAUTION
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.
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.
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. Unit
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.
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 Y1 and Y2 terminals at outdoor unit.
3. Close the liquid service valve.
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.
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.
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
15
Replaces: 25VNA8--- 5SI
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
the specific inverter supplied with the unit.
Variable speed Control Board
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
and/or improper operation.
Do not attempt to apply line voltage directly to the
compressor. This will destroy the compressor.
Electronic Expansion 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 control Connections
A13361
Fig. 34 -- AOC (Application Operational Control) Board
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 Transducer (SPT)
The AOC board is located in the lower right hand side of inverter
tray. It’s functions include:
S Compressor speed control
S Outdoor fan motor control
S Reversing valve operation
S Defrost operation
S Crankcase heater operation
S Pressure switch monitoring
S Time Delays
S Pressure Transducer measurements
S PEV control (pressure equalizer valve)
S Temperature measurements
S EXV (Electronic Expansion Valve) operation control
S Inverter communication and 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
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: The unit may be operated with an Infinity Touch Control
or a standard 2--stage HP thermostat. Infinity Touch Control will
utilize 5 stages of heating and cooling, while 2--stage HP
thermostat will only allow 2 discrete stages of heating and cooling
operation.
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 Equalizer Valve (PEV)
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.
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.
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
16
Replaces: 25VNA8--- 5SI
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 Plug
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
missing 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 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.
Table 4 – Factory Supplied Model Plug Information
25VNA8
MODEL PLUG
NUMBER
13
25
24B*
36
37
48
60
HK70EZ029
HK70EZ001
HK70EZ009
HK70EZ002
HK70EZ026
HK70EZ003
HK70EZ004
PIN RESISTANCE
(K--- ohms)
Pins 1--- 4
Pins 2--- 3
11K
5.1K
5.1K
5.1K
11K
5.1K
5.1K
220K
11K
91K
18K
120K
24K
33K
Service Tool
To use a service tool, connect the A and B communication bus
wires from this second communicating control to the terminals
marked A and B on the terminal strip located in the bottom left
corner of the AOC board (see Fig. 35). But instead of connecting
the wires on the service tool to the terminals marked C and D,
connect the C and D wires from the service tool to the 24V and C
on ST1 as shown in Fig. 35.
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 minutes.
Pressure Switch 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:
1. Display the appropriate fault code (see Table 7).
2. After a 15 minute 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 minute
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.
4. If HPS trips 3 consecutive cycles, the unit operation is
locked out for 4 hours.
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.
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
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
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 minimum of 190V. The
control will flash the appropriate fault code (see Table 7).
230V Line (Power Disconnect) Detection
Fig. 35 -- Service Tool Connection
A150062
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.
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.
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
17
Replaces: 25VNA8--- 5SI
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).
Refer to Table 5 and Fig. 36 and 37 for resistance values versus
temperature.
Table 5 – 10K/50Kohm Resistance Values vs Temperature
10Kohm
_C (_F)
TEMPERATURE
25.0 (77.0)
0.0 (32.0)
-28.0 (-18.4)
RESISTANCE (ohms)
10.0 + / --- 2.3%
32.6 + / --- 3.2%
85.5 + / --- 3.4%
50Kohm
125.0 (257.0)
75.0 (167.0)
25.0 (77.0)
1.7 + / --- 1.6%
7.40 + / --- 2.0%
50.0 + / --- 2.3%
THERMISTOR CURVE
90
RESISTANCE (KOHMS)
80
S 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.
The thermistor comparisons are not performed during low ambient
cooling or defrost operation.
Failed Thermistor Default Operation
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.
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.
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.
Outdoor Coil Thermistor
70
The outdoor coil thermistor is a 10Kohm resistor used for multiple
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. 39 for proper placement. See Table 5 for
proper resistances.
60
50
40
30
20
10
0
0
20
40
60
80
TEMPERATURE (DEG. F)
100
120
A91431
Fig. 36 -- 10K Thermistor Resistance Versus Temperature
RESISTANCE (KOHMS)
50K THERMISTOR
450
400
350
300
250
200
150
100
50
0
0
20
40
60
80
100
120
TEMPERATURE (°°F)
A14022
A14302
Fig. 37 -- 50K Thermistor Resistance Versus Temperature
Fig. 38 -- Outdoor Coil Thermistor (OCT) Attachment
(On Distributor Tube)
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. 38, 39, 40 and 41).
OAT Thermistor must be locked in place with
spherical nib end facing towards the front of
the control box
Thermistor Sensor 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:
S 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.
A11142
Fig. 39 -- OAT Thermistor Location (Bottom of Control Box)
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
18
Replaces: 25VNA8--- 5SI
Suction Thermistor (OST)
Variable Speed Compressor Winding Resistance
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. 40).
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 power leads from the inverter MOC
terminals, U (YEL), V (RED), and W (BLK).
2. Measure the resistance between YEL to RED, YEL to BLK,
and RED to BLK and compare to Table 6 values. Each
resistance set should be equal.
3. Measure the resistance to ground for each lead.
4. If the resistances check out, reconnect power leads to
appropriate terminal.
5. If the resistances appear to be abnormal, it will be necessary
to measure the resistance at the compressor fusite terminals.
6. During the removal of the compressor fusite cap, do not remove the RTV sealant. Remove the harness plug, measure
the resistances, and compare to Table 6.
7. Special 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 as none of it has been removed during the cap
removal.
8. Reinstall compressor sound blanket making sure discharge
thermistor and compressor power harness are routed as they
were from the factory
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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.
Table 6 – Variable Speed Compressor Resistance
(winding resistance at 70_F 20_F)
A14023
WINDING
Fig. 40 -- Suction Thermistor (OST) Attachment
(On Suction Tube)
MODEL 25VNA8
25
36
37, 48
13, 24B
Between
terminals
1.13
OHM
.59
OHM
Between
terminal &
ground
Discharge Thermistor (ODT)
Discharge Thermistor is used for protection against over
temperature of the compressor. The ODT is located on the
compressor discharge stub--out (see Fig. 41).
.59
OHM
.37
OHM
60
.24
OHM
>1 mega OHM
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
and/or improper operation.
Do not use Meggar for measuring the winding resistance.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
and/or improper operation.
To maintain water integrity of the compressor fusite terminal
box, the two holes in outer ring need to be full of RTV sealant.
A14024
Fig. 41 - Discharge Thermistor (ODT)
Fan Motor
If verification of proper operation is required for the fan motor
used in this unit, follow these steps:
1. Disconnect fan motor connector from control board.
2. Measure resistance between any 2 of the 3 leads present.
3. Compare measurement to values below
Fan Motor Resistance
Unit Size
Resistance (Ohms)
13, 24B
21.2
25, 36, 37, 48, 60
11.1
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
19
Replaces: 25VNA8--- 5SI
Status Codes
!
ATTENTION
Unit may occasionally become unresponsive due to certain
combinations of previous fault codes. There may not be
anything wrong with the unit or components. The unit may
require a high voltage power cycling for at least 2 minutes or
longer to clear the condition. If the condition persists, conduct
further troubleshooting per Service Manual.
Table 7 shows the status codes flashed by the amber status light.
Most system problems can be diagnosed by reading the status code
as flashed by the amber status light on the control board.
The codes are flashed 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 long flash is 1.0 second. Time between code
repeating is 2.5 seconds with LED OFF.
Codes are easily read from user interface (UI)
EXAMPLE:
3 short flashes followed by 2 long flashes indicates a 32 code.
Table 7 shows this to be low pressure switch open.
Utility Interface With Infinity Touch Control
The utility curtailment relay should be wired between the two
UTIL connections on the control board for this Infinity
Communicating System (see Fig. 42). 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 status screen will display, ”Curtailment Yes”.
See UI installation instructions for setup details.
Utility Relay
A13414
Fig. 42 -- Variable Speed Control Board with optional Utility Relay
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
20
Replaces: 25VNA8--- 5SI
Table 7 – Troubleshooting
Flash Code
Type
ON, no flash
1, pause
1,
(2 sec ON),
longer pause
(1 second OFF)
25
31
32
33
46
48
49
53
Amber LED Description
Reset
Time
Mode
Possible Causes
Both
Wrong Model Plug
Installed
Damaged Model
Plug
Missing model plug
on service board
Damaged AOC control
Incorrect Model
Plug with Inverter
Size
Variable Capacity (Range
Cutback)
System
Malfunction
INVALID MODEL PLUG/INVERTER SIZE
NA
Local
HIGH PRESSURE SWITCH
OPEN
(stage/speed down for
each occurrence, elevates
to fault code 84 when it occurs while running on the
lowest stage)
6 Minutes
(then reduced
stage
operation)
Local
LOW PRESSURE TRIP
(elevates to fault code 83
after 3 occurrences)
6 Minutes
Local
LOST INVERTER COMMUNICATIONS
(Occurs after 2 minutes of
no communications between AOC and MOC)
(Elevates to fault code 48
after 3 consecutive failures
within 20 minute or 20 minutes continuous loss of
connection)
6 Minutes
BROWNOUT EVENT
6 Minutes
Local
System
Malfunction
LOST INVERTER COMMUNICATIONS
(Elevated from fault code
33 after 3 occurrences)
Local
COMPRESSOR OVER
CURRENT FAULT
(Elevates to fault code 95
after 3 occurrences)
Fault
OUTDOOR AIR TEMP
SENSOR FAULT
6 Minutes
6 Minutes
NA
Fault
SUCTION TEMP SENSOR
FAULT
Re ---install original model plug
Replace AOC control
Replace plug or inverter with correct size
(If model plug is for 2 Ton but Inverter is 3
Ton, fault code 25 will be shown)
High Pressure Event
Both
Low Pressure Event
System will self ---mitigate, persistent conditions will lead to lockout (refer to Error
Code 83) 2 hours of accumulated operation without further fault will reset fault
counter
Verify good harness connection
Both
Loose or disconnected harness
(Hardness between
AOC (PL20) and
MOC)
Radio or Electrical
noise
System will try to self ---mitigate with repeated start attempts
Possible damage to
inverter
change out the Inverter drive
Both
low line voltages
if persistent contact power provider
Both
Loose or disconnected harness
(Hardness between
AOC (PL20) and
MOC)
Radio or Electrical
noise
Possible damage to
inverter
Both
Both
Both
Both
Verify good harness connection
System will try to self ---mitigate with repeated start attempts
change out the Inverter drive
Refer to fault code
95
Refer to fault code 95
Sensor Harness not
connected to AOC
control
Ensure plug is connected to AOC control
Broken or loose
harness wire
Broken or Damaged
Sensor
NA
Verify correct model plug installed
Check model plug for corrosion or breakage; replace if necessary
System will self ---mitigate by reducing the
stage, persistent conditions will lead to
lockout (refer to Error Code 84). 2 hours
of accumulated operation without further
fault will reset fault reduced stage operation.
Hardware damage
to AOC control
Sensor Harness not
connected to AOC
control
54
Actions
Standby
Variable Capacity
Check harness for continuity; see resistance chart to check resistance at given
temperature
Check harness for continuity; see resistance chart to check resistance at given
temperature
Replace AOC control
Ensure plug is connected to AOC control
Broken or loose
harness wire
Check harness for continuity; see resistance chart to check resistance at given
temperature
Suction Thermistor
not properly attached or in wrong
location
Ensure Sensor is properly attached to the
accumulator entry ---tube
Broken or Damaged
Sensor
Check harness for continuity; see resistance chart to check resistance at given
temperature
Hardware damage
to AOC control
Replace AOC control
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
21
Replaces: 25VNA8--- 5SI
Flash Code
55
Type
Fault
Amber LED Description
COIL TEMP SENSOR
FAULT
Reset
Time
NA
Mode
Both
Both
56
Local
OAT ---OCT THERMISTOR
OUT OF RANGE
NA
Cool
Possible Causes
Actions
Sensor Harness not
connected to AOC
control
Ensure plug is connected to AOC control
Broken or loose
harness wire
Check harness for continuity; see resistance chart to check resistance at given
temperature
Coil Thermistor not
properly attached or
in wrong location
Ensure Sensor is properly clipped to the
distributor entry ---tube
Broken or Damaged
Sensor
Check harness for continuity; see resistance chart to check resistance at given
temperature
Hardware damage
to AOC control
Coil Thermistor not
properly attached or
in wrong location
Outdoor Ambient
Temperature sensor
improperly installed
(sensor body may
be in contact with
sheet metal)
Heating when cooling is demanded
Sensor Harness not
connected to AOC
control
Broken or loose
harness wire
57
Fault
SUCTION PRESSURE
SENSOR FAULT
NA
Both
Electrical short destroyed Transducer
electronics
Heat damage during brazing
59
61
Local
DISCHARGE TEMP OUT
OF RANGE EVENT
(elevates to fault code 74
after 3 occurrences)
Local
FAN INVERTER FAULT
(elevates to fault code 76
after 5 occurrences)
62
Local
63
Local
65
Local
FAN INVERTER TEMP
HIGH
(elevates to fault code 85
after 3 occurrences)
FAN INVERTER CURRENT
FAULT
(elevates to fault code 86
after 3 occurrences)
DC VOLTS LOW --- SPEED
LIMITING
6 Minutes
6 Minutes
Both
Both
Check fuse on AOC control
Check wiring between AOC and reversing
valve
troubleshoot reversing valve
Inspect outdoor coil for obstructions
Ensure plug is connected to AOC control
Check harness
Compare transducer reading to gauge
reading at service valve (see transducer
measurement chart); Check system for
electrical shorts and correct; replace
transducer
Compare transducer reading to gauge
reading at service valve (see transducer
measurement chart); replace transducer
See fault 74
Same actions for 74
OFM failed to start
Troubleshoot outdoor fan motor & blade
and make sure they are working
Fan motor misalignment
See Fault 76
System will attempt to run again
Same actions for 76
See fault 85
Same actions for 85
6 Minutes
Both
See fault 86
Same actions for 86
Low supply line voltage (< 197 VAC)
Loose wire in control box area
Inverter internal
damage
MOC is reporting
that OFM isn’t running
There is a demand
for stator heat but
MOC doesn’t detect
it
High voltage power
cycle
Phase imbalance/
compressor or inverter miswire
Flooded start
Incorrect refrigerant
charge
Inverter damage
Compressor damage
Check supply voltage to ODU; if low contact utility provider
NA
Both
OUTDOOR FAN DROPPED
OUT
6 Minutes
Both
67
Local
STATOR HEATER FAULT
6 Minutes
Both
68
Event
10 MIN STAGE 2 WARMUP
DELAY
10 Minutes
Both
INVERTER/COMPRESSOR
INTERNAL FAULT
Properly install OAT sensor
Both
Local
System
Malfunction
Ensure Sensor is properly clipped to the
distributor entry ---tube
NA
66
69
Replace AOC control
15 Minutes
Both
Loose wire: check for loose wire in ODU
Replace Inverter
Troubleshoot outdoor fan motor and
make sure it is working
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
No action
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
Troubleshoot EXV & TXV
Check refrigerant amount
Replace inverter
Replace compressor
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
22
Replaces: 25VNA8--- 5SI
Flash Code
Type
Amber LED Description
Reset
Time
Mode
Possible Causes
Actions
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
71
Local
COMPRESSOR DROPPED
OUT
6 Minutes
Both
MOC is reporting
that compressor
isn’t running
72
Local
SUCTION OVER TEMPERATURE EVENT
(elevates to fault code 82
after 3 occurrences)
15 Minutes
Both
See fault 82
Same actions for 82
Sensor Harness not
connected to AOC
control
Ensure plug is connected to AOC control
Broken or loose
harness wire
Broken or Damaged
Sensor
Both
74
System
Malfunction
DISCHARGE TEMP OUT
OF RANGE LOCKOUT
(Elevated from fault code
59 after 3 occurrences)
2 Hours
Reversing Valve Bypass or Reversing
Valve not energized
Cool
Heat
Heat
75
76
77
79
Local
System
Malfunction
Local
Local
MAXIMUM POWER MODE
--- TEMP (Temporary RPM
reduction or stage lowering will result.)
FAN INVERTER LOCKOUT
(Elevated from fault code
61 after 5 occurrences)
MAXIMUM POWER MODE
--- COMP CURRENT
(Temporary RPM reduction
or stage lowering will result.
COMPRESSOR/INVERTER
FAULT
(Elevates to fault code 88
after 3 occurrences)
Hardware damage
to AOC control
Indoor Unit Airflow
too low or off
Outdoor Unit Airflow
too low or off
High Load conditions
Low Charge or Loss
of Charge at low
ambient heating
conditions
Expansion Device
Restriction
Outdoor Airflow too
low or off
NA
Both
Blocked Inverter
Heat Exchanger
(fins)
Application violates
guideline
Fan blade bent/out
of balance
Fan blade restricted
2 Hours
Both
Fan motor wiring
Fan motor
Inverter damage
Compressor is operating outside the allowed operational
envelope
Incorrect refrigerant
charge
NA
6 Minutes
Both
Both
Check harness for continuity; see resistance chart to check resistance at given
temperature
Check harness for continuity; see resistance chart to check resistance at given
temperature
Replace AOC control
Troubleshoot indoor fan motor and make
sure it is working
Troubleshoot outdoor fan motor and
make sure it is working
Reversing Valve stuck halfway
Ensure AOC fuse is good
24 VDC in cooling mode
Check harness and connectors
Over charge: Check system charge
Undercharged or No charge: check
charge
Heating: Trouble shoot EXV (coil, harnesses); Trouble shoot the TXV
Power Cycle system, is EXV moving on
power up (audible)
Check ODU coil for clogging (ice or debris) and clean if necessary; Troubleshoot
ODU fan motor and make sure it is working
Check Inverter fins for debris and clean if
necessary
Consult Application Guideline for compliance
Check outdoor fan blade
Check for ice build up
Check outdoor fan blade clearance
Check for ice build up
Check outdoor fan motor connectors and
harness
Replace outdoor fan motor
Replace inverter
Inverter will reduce speed to a lower
stage
Check refrigerant amount
Incoming power
supply voltage
Loose or incorrect
wire connections
Check ODU coil for clogging (ice or debris) and clean if necessary; Troubleshoot
ODU fan motor and make sure it is working
Check voltage versus unit rating plate for
allowable range
Check incoming power leads and leads
to the compressor plug
Compressor fails to
start
System will try to self ---mitigate with repeated start attempts
Outdoor Airflow too
low or off
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
23
Replaces: 25VNA8--- 5SI
Flash Code
Type
Amber LED Description
Reset
Time
Mode
Both
82
System
Malfunction
SUCTION OVER TEMP
LOCKOUT
(Elevated from fault code
72 after 3 occurrences)
Cool
4 Hours
Cool
Heat
Both
Cool
Cool
Cool
83
System
Malfunction
Undercharged System
Cool
Indoor Airflow too
low or off
Cool
4 Hours
Incorrect refrigerant
charge
Uninsulated vapor
line
Indoor TXV operation
Outdoor EXV operation
Reversing valve bypass
Cooling in Low Ambient region (55 ° F
and below) with
”Low Ambient Cooling Control” disabled
Outside Normal Operating Range (e.g.
improper load calculation, system
match issue, outside
cooling range etc.)
Service Valve left
closed (Liquid or
Vapor)
Cool
Cool
LOW PRESSURE LOCKOUT FOR 4 HOURS
(Elevated from fault code
32 after 3 occurrences)
Possible Causes
Cool
Restriction in Filter
Drier plus Long Line
Application and filter
drier on Indoor Unit
Restriction due to
debris
Restriction in Circuits or Tubing
Heat
Heat
Heat
Outside Normal Operating Range (e.g.
improper load calculation, system
match issue, outside
heating range etc.)
Service Valve left
closed (Liquid Service Valve)
Heat
Outdoor Airflow too
low or off
Heat
Undercharged System
Heat
Both
Both
Restriction due to
debris
Restriction in Filter
Drier plus filter drier
on Outdoor Unit
Expansion Device
Restriction
Actions
Check refrigerant amount
Insulate the vapor line
Troubleshoot TXV
Troubleshoot EXV
troubleshoot reversing valve
Enable ”Low Ambient Cooling” via user
interface
Consult Application Guidelines
Ensure Service Valves are open
Check system subcooling to determine
charge status, if low add charge using
Charging Mode (follow proper charging
procedures)
Check Indoor for clogging (ice or debris)
and clean or de ---ice if necessary; Troubleshoot Indoor fan motor and make sure
it is working; follow Indoor Airflow troubleshooting instruction
Clean System (refer to application guideline) and replace filter drier
Clean System (refer to application guideline) and replace filter drier
Check kinks and straighten or replace circuits
Troubleshoot EXV (see guide below)
Consult Application Guidelines
Ensure Liquid Service Valve is open
Check Outdoor for clogging (ice or debris) and clean or de ---ice if necessary;
Troubleshoot Outdoor fan motor and
make sure it is working; follow Outdoor
Airflow troubleshooting instruction
Check charge in cooling (if in Cooling
Charge Mode Ambient Range), if low add
charge using Charging Mode (follow
proper charging procedures); if outside
cooling charge mode range, pull out
charge, weigh in using heating charge
mode
Clean System (refer to application guideline) and replace filter drier
Clean System (refer to application guideline) and replace filter drier
If short lineset (less than 15 ft.) Troubleshoot TXV (see guide below); replace
if necessary
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
24
Replaces: 25VNA8--- 5SI
Flash Code
Type
Amber LED Description
Reset
Time
Mode
Both
Both
Both
Both
84
System
Malfunction
Cool
Cool
Overcharged System
Heat
Indoor Airflow too
low or off
Both
4 Hours
Both
Cool
Cool
Cool
Both
Heat
Heat
Heat
Both
85
System
Malfunction
FAN INVERTER TEMP
LOCKOUT
(Elevated from fault code
62 after 3 occurrences)
15 minutes
Outside Normal Operating Range (e.g.
improper load calculation, system
match issue, outside
cooling range, outside heating range
etc.)
Service Valve left
closed (Liquid or
Vapor)
Loose High Pressure Switch harness
leads
Pressure Switch disconnected from
ODU Control Board
Outdoor Airflow too
low or off
Both
HIGH PRESSURE LOCKOUT FOR 4 HOURS
(Elevated from fault code
31 when the stage (speed)
can no longer be lowered)
Possible Causes
Restriction due to
debris leading to
Overcharge when
charging
Restriction in EXV
plus Long Line Application leading to
Overcharge when
charging in Cooling
mode
Non ---condensable
leading to high load
Restriction in Filter
Drier plus Long Line
Application and filter
drier on Outdoor
Unit
Restriction in EXV
plus Overcharge
Restriction in Circuits or Tubing
Faulty Pressure
Switch
Electric Heater plus
Heat pump application: Electric Heater
stuck on
Furnace plus Heat
pump application:
Furnace stuck on
Restriction in Filter
Drier plus Long Line
Application and filter
drier on Indoor Unit
Expansion Device
Restriction
Actions
Consult Application Guidelines
Ensure Service Valves are open
Check HPS harness
Check HPS connection on ODU control
Check Outdoor Coil for clogging (ice or
debris) and clean or de ---ice if necessary;
Troubleshoot Outdoor fan motor and
make sure it is working; follow Outdoor
Airflow troubleshooting instruction
Check system charge using Cooling
Charging Mode (follow proper charging
procedures)
Check Indoor for clogging (ice or debris)
and clean or de ---ice if necessary; Troubleshoot Indoor fan motor and make sure
it is working; follow Indoor Airflow troubleshooting instruction
Clean System (refer to application guideline) and replace filter drier
If long line, troubleshoot EXV
Clean System (refer to application guideline) and replace filter drier
Clean System (refer to application guideline) and replace filter drier
troubleshoot EXV
Check kinks and straighten or replace circuits
Check Discharge pressure with gauge, if
less than 610 +/ --- 20 psig and switch is
open (measure resistance) then replace
pressure switch
If User Interface is not requesting Electric
Heat check for heater relays, if on troubleshoot Electric Heater
If not in Defrost and Furnace is running
same time as heat pump, troubleshoot
Furnace
Clean System (refer to application guideline) and replace filter drier
Troubleshoot TXV
Troubleshoot EXV
Check charge in cooling (if in Cooling
Charge Mode Ambient Range), if low add
charge using Charging Mode (follow
proper charging procedures); if out side
cooling charge mode range, pull out
charge, weigh in using heating charge
mode
Heat
Overcharged System
Heat
Reversing Valve
Stuck in Cooling
troubleshoot reversing valve
Unusual loading of
the fan
Troubleshoot outdoor fan motor & blade
and make sure they are working
Check for fan outlet blockage due to
snow/ice etc.
Both
Both
Improper airflow
across inverter heat
sink
Inverter damage
Inspect outdoor coil for obstructions
Replace inverter
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
25
Replaces: 25VNA8--- 5SI
Flash Code
86
Type
Amber LED Description
System
Malfunction
FAN INVERTER CURRENT
LOCKOUT
(Elevated from fault code
63 after 3 occurrences)
Reset
Time
5 minutes
Mode
Both
Possible Causes
Sudden supply voltage change
Sudden load
change on fan/motor
Inverter damage
Blocked Inverter
Heat Exchanger
(fins)
Condenser Airflow
too low or off
88
System
Malfunction
COMPRESSOR / INVERTER LOCKOUT
(Elevated from fault code
79 after 3 occurrences)
2 Hours
Both
Evaporator Airflow
too low or off
High Load conditions at cold ambient heating or high
ambient cooling
Inverter damage
Occurs when bus
voltage exceeds 410
VDC
Compressor is suddenly unloaded
Inverter damage
Occurs when bus
voltage falls below
220 VDC
91
Local
INVERTER VDC ---OUT
OVER VOLTAGE EVENT
5 Minutes
Both
92
Local
INVERTER VDC ---OUT UNDER VOLTAGE EVENT
5 Minutes
Both
93
Local
230VAC UNDER VOLTAGE
EVENT
(elevates to fault code 96
after 3 occurrences)
5 Minutes
Both
Occurs when incoming voltage is
less than 197 VAC
94
Local
230VAC OVER VOLTAGE
EVENT
(elevates to fault code 97
after 5 occurrences)
5 Minutes
Both
Occurs when incoming voltage is
more than 253 VAC
Both
High superheat
Both
95
System
Malfunction
COMPRESSOR OVER
CURRENT LOCKOUT
(Elevated from fault code
49 after 3 occurrences)
2 Hours
Phase imbalance
Both
96
97
98
System
Malfunction
System
Malfunction
Local
VDC UNDER VOLTAGE
LOCKOUT
(Elevated from fault code
93 after 3 occurrences)
VDC OVER VOLTAGE
LOCKOUT
(Elevated from fault code
94 after 3 occurrences)
HIGH TORQUE EVENT
(Event will cause stage
down and when stage is at
lowest level, will elevate to
fault code 99)
Compressor is operating outside the allowed operational
envelope
Incoming power
supply voltage
Loose or incorrect
wire connections
2 Hours
2 Hours
NA
Both
Both
Both
Outdoor Airflow too
low or off
Refrigerant overcharge
Inverter damage
Compressor internal
damage
Low supply line voltage (< 197 VAC)
Loose wire in control box area
Inverter internal
damage
High supply line
voltage (> 253 VAC)
Inverter internal
damage
Compressor is operating outside the allowed operational
envelope
Actions
Investigate incoming voltage
Troubleshoot outdoor fan motor & blade
and make sure they are working. Check
harness and connectors
Replace inverter
Check Inverter fins for debris and clean if
necessary
Check Condenser (IDU in heating, ODU
in cooling) for clogging (ice or debris) and
clean if necessary; Troubleshoot Condenser fan motor and make sure it is
working
Check Evaporator (IDU in cooling, ODU
in heating) for clogging (ice or debris)
and clean if necessary; Troubleshoot
Evaporator fan motor and make sure it is
working
Over charge: Check system charge
Replace inverter
Check operation of compressor
Check that the service valves are fully
open
Replace inverter
Check for interruption in main power supply
System will try to ride through voltage
spikes (possibly caused by weather
event) and self ---recover in trip condition;
persistent over voltage rips will lead to
fault 96
System will try to ride through voltage
spikes (possibly caused by weather
event) and self ---recover in trip condition;
persistent over voltage trips will lead to
fault 97
Troubleshoot TXV
Troubleshoot EXV
Check suction pressure transducer and
suction temperature sensor
Inverter will reduce speed to a lower
stage
Check voltage versus unit rating plate for
allowable range
Check incoming power leads and leads
to the compressor plug
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
Check ODU coil for clogging (ice or debris) and clean if necessary; Troubleshoot
ODU fan motor and make sure it is working
Check refrigerant amount
Replace inverter
Replace compressor
Check supply voltage to ODU; if low contact utility provider
Loose wire: check for loose wire in ODU
Replace Inverter
Check supply voltage to ODU; if high
contact utility provider
Replace Inverter
Inverter will reduce speed to a lower
stage
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
26
Replaces: 25VNA8--- 5SI
Flash Code
98
99
Type
Amber LED Description
Reset
Time
Mode
Possible Causes
Actions
Local
HIGH TORQUE EVENT
(Event will cause stage
down and when stage is at
lowest level, will elevate to
fault code 99)
NA
Both
Refer to 99
Refer to 99
Both
Miswire
Check miswire of compressor leads at
terminals U,V,W
Both
Refrigerant overcharge
System
Malfunction
HIGH TORQUE LOCKOUT
(Elevated from fault code
98 when 98 occurs at lowest stage)
2 hours
Both
Outdoor Airflow too
low or off
Both
Expansion Device
Restriction
Check refrigerant amount
Check ODU coil for clogging (ice or debris) and clean if necessary; Troubleshoot
ODU fan motor and make sure it is working
Troubleshoot TXV
Troubleshoot EXV
Catalog No: 25VNA8--- 6SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
27
Replaces: 25VNA8--- 5SI
FINAL CHECKS
IMPORTANT: Before leaving job, be sure to do the
following:
1. Ensure that all wiring is routed away from tubing
and sheet metal edges to prevent rub--through or
wire pinching.
2. Ensure that all wiring and tubing is secure in unit
before adding panels and covers. Securely fasten
all panels and covers.
3. Tighten service valve stem caps to 1/12--turn past
finger tight.
4. Leave User’s Manual with owner. Explain system
operation and periodic maintenance requirements
outlined in manual.
5. Fill out Dealer Installation Checklist and place in
customer file.
CARE AND MAINTENANCE
For continuing high performance and to minimize
possible equipment failure, periodic maintenance must be
performed on this equipment.
Frequency of maintenance may vary depending upon
geographic areas, such as coastal applications. See
Owner’s Manual for information.
PURONR (R--410A) REFRIGERANT QUICK REFERENCE GUIDE
S Puron refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement
components are designed to operate with Puron refrigerant.
S Puron refrigerant cylinders are rose colored.
S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
S Puron refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose
when charging into suction line with compressor operating.
S Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard.
S Use hoses with 700 psig service pressure rating.
S Leak detectors should be designed to detect HFC refrigerant.
S Puron refrigerant, as with other HFCs, is only compatible with POE oils.
S Vacuum pumps will not remove moisture from oil.
S Do not use liquid--line filter driers with rated working pressures less than 600 psig.
S Do not leave Puron refrigerant suction line filter driers in line longer than 72 hours.
S Do not install a suction--line filter drier in liquid--line.
S POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
S POE oils may cause damage to certain plastics and roofing materials.
S Wrap all filter driers and service valves with wet cloth when brazing.
S A factory--approved liquid--line filter drier is required on every unit.
S Do NOT use an R--22 TXV.
S If indoor unit is equipped with an R--22 TXV or piston metering device, it must be changed to a hard--shutoff Puron refrigerant
TXV.
S Never open system to atmosphere while it is under a vacuum.
S When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter
driers. Evacuate to 500 microns prior to recharging.
S Do not vent Puron refrigerant into the atmosphere.
S Do not use capillary tube coils.
S Observe all warnings, cautions, and bold text.
S All indoor coils must be installed with a hard--shutoff Puron refrigerant TXV metering device.
Use of the AHRI Certified
TM Mark indicates a
manufacturer’s
participation in the
program For verification
of certification for individual
products, go to
www.ahridirectory.org.
Copyright 2016 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Edition Date: 01/16
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
28
Catalog No: 25VNA8--- 6SI
Replaces: 25VNA8--- 5SI
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