Installation Instructions 25VNA Infinity with Greenspeed

Installation Instructions 25VNA Infinity with Greenspeed
25VNA
Infinityt Variable Speed Heat Pump
with Greenspeedt Intelligence
2 to 5 Nominal Tons
Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
TABLE OF CONTENTS
PAGE NO.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION RECOMMENDATIONS . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3--11
Step 1 — Check Equipment and Jobsite . . . . . . . . . . . 3
Step 2 — Install on Solid Pad . . . . . . . . . . . . . . . . . . . 3
Step 3 — Clearance Requirements . . . . . . . . . . . . . . . . 3
Step 4 — Operating Ambient . . . . . . . . . . . . . . . . . . . 3
Step 5 — Elevate Unit . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 6 — Liquid Line Solenoid Valve (LSV) . . . . . . . 4
Step 7 — Making Piping Connections . . . . . . . . . . . . 4
Step 8 — Make Electrical Connections . . . . . . . . . . . . 7
Step 9 — Compressor Crankcase Heater . . . . . . . . . . . 7
Step 10 — Install Accessories . . . . . . . . . . . . . . . . . . . . 8
Step 11 — Start--Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 12 — System Functions and Seq. Of Op. . . . . . . . 8
Step 13 — Check Charge . . . . . . . . . . . . . . . . . . . . . . 10
Step 14 — Pumpdown & Evacuation . . . . . . . . . . . . . 11
MAJOR COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . 12
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FINAL CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . 18
PURONr REFRIGERANT QUICK REF. GUIDE . . . . 18
Information in these installation instructions pertains only to
25VNA 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.
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.
!
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.
Indoor Thermostat Control Options
Model
Infinity
Control
25VNA
Yes*
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).
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.
* Requires model SYSTXCCUID01 ---V or SYSTXCCUIZ01 ---V or newer.
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.
!
!
WARNING
CAUTION
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.
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.
OUTDOOR WALL
INDOOR WALL
CAULK
LIQUID TUBE
PRIOR TO TOUCHING ELECTRICAL COMPONENTS:
Verify zero (0)voltage at inverter connections shown on
inverter cover.
SUCTION TUBE
INSULATION
Inverter Cover
THROUGH THE WALL
IMPORTANT: The inverter cover should NEVER be removed
because there is no reason to remove the inverter cover to access
the inverter. The inverter is not serviceable. A replacement cover
is provided with a replacement inverter.
!
JOIST
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
INSULATION
SUCTION TUBE
WARNING
1” (25.4 mm)
MIN
LIQUID TUBE
SUSPENSION
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.
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.
A07588
Fig. 1 -- Connecting Tubing Installation
The outdoor unit contains the correct amount of refrigerant charge
for operation with AHRI rated and factory--approved smallest
indoor unit 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 25VNA
applications including long line applications.
IMPORTANT: Always install the factory--supplied liquid--line
filter drier. Obtain replacement filter driers from your distributor or
branch.
IMPORTANT: Always install the factory--supplied muffler (part
#LM10KK003) on the vapor line as described in the Factory
Supplied Muffler Installation section of these instructions.
Obtain replacement mufflers from you distributor or branch.
2
INSTALLATION
Step 3 — Clearance Requirements
Specifications for this unit in residential new construction market
require the outdoor unit, indoor unit (including metering device),
refrigerant tubing sets, and filter drier, and muffler 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.
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.
3/8--- in. (9.53 mm) Dia.
Tiedown Knockouts in
Basepan(2) Places
View From Top
A05177
UNIT BASE PAN
Dimension in. (mm)
35 X 35
(889 X 889)
TIEDOWN KNOCKOUT LOCATIONS in. (mm)
A
B
C
9–1/8 (231.8)
6–9/16 (166.7)
28–7/16 (722.3)
Fig. 3 -- Tiedown Knockout Locations
Step 4 — Operating Ambient
The minimum outdoor operating ambient in cooling mode is 55_F
(12.78_C) without low ambient cooling enabled, and the
maximum outdoor operating ambient in cooling mode is 125_F
(51.67_C). The maximum heating operation ambient is 66_F
(18.9_C). Compressor protections prevent operation below --10 to
--20_F.
A11380a
Fig. 2 -- Louver Spacer Location
Inspect Equipment
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 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
Step 2 — Install on a Solid, Level Mounting Pad
Failure to follow this caution may result in equipment
damage or improper operation.
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.
Do not allow water and/or ice to build up in base pan.
!
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.
3
Step 6 — In Long--Line Applications, Install
Liquid--Line Solenoid Valve (LSV)
Step 7 — Make Piping Connections
Furnace or
Fan Coil
User Interface
A
B
C
D
S1
S2
Green
Yellow
White
Red
A
A
B
C
D
ABCD
Connection (optional)
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.
!
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.
C
D
!
LLS
Optional Remote
Room Sensor
CAUTION
UNIT DAMAGE HAZARD
Variable
Speed
HP
B
WARNING
!
For refrigerant piping arrangements with equivalent lengths of
greater than 80 ft. (24.38 m) and/or when elevation difference
between indoor and outdoor unit is greater than 20 ft. (6.10 m),
follow the piping configuration and liquid line solenoid valve
(LSV) accessory requirements from the Residential Piping and
Long--line guideline. CCH, start gear and piston changes do not
apply. If required by Long--Line Guideline, install LSV kit, part
no. KHALS0401LLS, specifically designed for Puron refrigerant
heat pumps. LSV should be installed within 2 ft. (0.61 m) of
outdoor unit with flow arrow pointing toward outdoor unit.
Make the necessary electrical connections as shown on Fig. 21 and
by following the Installation Instructions included with accessory
kit.
IMPORTANT: Flow arrow must point toward outdoor unit.
CAUTION
C
UNIT DAMAGE HAZARD
LS
Failure to follow this caution may result in equipment
damage or improper operation.
A11107
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).
Fig. 4 -- Liquid Line Solenoid Electrical Connection
(Required for long line applications)
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 beyond 80 ft. (24.38
m), substantial capacity and performance losses can occur. Follow
the pipe sizing recommendations in the 25VNA Product data to
manage these losses.
Refer to Table 1 for field tubing diameters. Refer to Table 2 for
accessory requirements.
4
Table 1 – Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (in.)
LIQUID
VAPOR*
UNIT SIZE
Connection
Diameter
Tube
Diameter
Connection
Diameter
Max (Rated)
Diameter
Minimum Tube
Diameter
25VNA024
3/8
3/8
7/8
7/8
5/8
25VNA036
3/8
3/8
7/8
7/8
5/8
25VNA048
3/8
3/8
7/8
1--- 1/8
3/4
25VNA060
3/8
3/8
7/8
1--- 1/8
3/4
* 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.
2. For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal and / or greater than 20 ft. (6.1 m) vertical differential, an accessory Liquid Line
Solenoid must be installed.
Table 2 – Accessory Usage
ACCESSORY
REQUIRED FOR
LOW --- AMBIENT COOLING
APPLICATIONS
(Below 55F/12.8_C)
REQUIRED FOR LONG LINE
APPLICATIONS*
(Over 80 ft/24.38 m)
REQUIRED FOR SEA
COAST APPLICATIONS
(Within 2 miles/3.22 km)
Installations with Radio
Frequency Interference
Concerns in the Range
of 2 to 30 MHZ
Crankcase Heater
Standard
Standard
Standard
Standard
Evaporator Freeze Protection
Standard with Infinityt Control
No
No
No
Liquid --- Line Solenoid Valve
No
Yes
No
No
Low--- Ambient Control
Standard with Infinity Control
No
No
No
Puron Refrigerant Balance Port
Hard --- ShutOff TXV
Yes{
Yes{
Yes{
Yes{
Support Feet
Recommended
No
Recommended
No
Winter Start Control
Standard with Infinity
Control
Standard with Infinity
Control
Standard with Infinity
Control
Standard with Infinity
Control
EMI Kit
No
No
No
Yes
* For tubing set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or 20 ft. (6.10 m) vertical differential (total equivalent length), an accessory
Liquid Line Solenoid must be installed.
{ Required on all indoor units. Standard on all new Puron refrigerant fan coils and furnace coils.
Standard = Standard for all new Puron refrigerant fan coils and furnace coils.
5
Outdoor Unit Connected to Factory-- Approved Indoor
Unit
Outdoor unit contains correct system refrigerant charge for
operation with factory--approved, AHRI--rated smallest indoor unit
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.
Install Liquid-- Line Filter Drier Indoor
Refer to Fig. 6 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
A05227
Fig. 6 -- Liquid--Line Filter Drier
Refrigerant Tubing connection Outdoor
Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 1).
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage or
improper operation.
Installation of filter drier in liquid line is required.
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.
Sweat Connections
Factory Supplied Muffler (part # LM10KK003)
Installation is Required On Every Installation:
S A muffler is required to reduce noise transmitted to indoor
through the line set.
S Muffler must be installed outside the dwelling. Muffler can also
be installed in vertical configuration for space consideration
maintaining a minimum of 12 in (304.8 mm) straight pipe
section to the closest bend.
S Maintain at least 12 in. (304.8 mm) straight pipe length to the
muffler shell inlet and from the outlet stubs.
S To prevent rusting, provide sufficient clearance between the
muffler and the ground surface. Also, position the muffler such
that accidental abuse (such as by a weed trimmer, lawn mower
etc.) of the painted surface is avoided.
S Insulating the muffler with Armaflext tape is recommended.
!
CAUTION
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
!
EXTERIOR
WALL
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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.
MUFFLER
TO DWELLING
Deep Vacuum Method
VAPOR LINE
A11543
Fig. 5 -- Muffler Installation
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. 7)
6
Connect Ground and Power Wires
5000
4500
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 8.
4000
3500
3000
2500
MICRONS
LEAK IN
SYSTEM
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
2000
1500
1000
FIELD POWER
VACUUM TIGHT
TOO WET
WIRING
TIGHT
DRY SYSTEM
500
0
1
2
3
4
5
MINUTES
6
7
FIELD GROUND
WIRING
A95424
GROUND
LUG
A95424
A91056
Fig. 7 -- Deep Vacuum Graph
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
Step 8 — Make Electrical Connections
!
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.
Fig. 8 -- Line Power Connections
Connect Control Wiring
Connect to Infinity connections. Only two wires (AB) to Infinity
capable indoor unit (furnace or fan coil) is required. Typical 4 wire
(ABCD) may be connected (see Fig. NO TAG).
IMPORTANT: This system requires the power supply to the
outdoor unit, and the indoor unit, for the UI to communicate with
the outdoor unit.
General Information
Use No. 18 AWG or larger 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.
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.
Step 9 — Compressor Crankcase Heater
This compressor has an internal crankcase heater. Furnish power
to the unit a minimum of 24 hr before starting the unit for the first
time.
To furnish power to heater only, set thermostat to OFF and close
electrical disconnect to outdoor unit.
Power is not required to the indoor unit or User Interface for proper
operation of heater. Crankcase heater will however be intelligently
energized as needed between operations, and otherwise even when
the UI and indoor unit is not installed, as long as there is power to
the outdoor unit even if the indoor unit and UI are not yet installed.
Airflow Setup for Infinity Control Furnace or FE
Fan Coil (communicating)
This system can only be installed with Infinity--capable indoor and
Infinity Touch User Interface (UI) SYSTXCCITN01 or
SYSTXCCITW01 with version 11 software or newer. When using
an Infinity 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.
7
Step 10 — Install Accessories
There are no refrigeration circuit or electrical accessories required
or available for installation within the unit. External to the unit, the
same accessories such as the liquid line solenoid, support feet,
snow rack, wind baffle etc., are available on other Carrier units can
also be used on this line of product. Refer to the individual
Installation Instructions packaged with kits or accessories when
installing.
Step 11 — Start--Up
!
CAUTION
A11104
Fig. 9 -- Required Charge Adjustment Calculated in UI
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
Observe the following:
1. Do not overcharge system with refrigerant.
2. Do not operate unit in a vacuum or at negative pressure.
3. Do not disable low pressure switch
4. Dome temperatures may be hot.
!
4. Set User Interface to operate cooling in CHARGING mode.
Charging mode operates system compressor speed and fan
speeds to proper conditions to check the refrigerant charge.
NOTE: Do not check charge in a mode other than CHARGING.
5. Wait for the specified stabilization time, depending on lineset length. Compare subcooling at liquid line service valve
to Liquid Line Subcooling Target as shown CHARGING
screen (LiqLin SC TGT) (see Fig. 10).
CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant.
!
CAUTION
ENVIRONMENTAL HAZARD
A11105
Fig. 10 -- Liquid Line Subcooling Target
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent
refrigerant to the atmosphere. Recover during system
repair or final unit disposal.
Follow these steps to properly start up the system:
1. After system is evacuated, close the disconnects to energize
the ID and OD units to assess the user interface (UI), Keep
system in off mode. Under the Advanced function menu,
assess the REQUIRED CHARGE CALCULATION screen.
Enter the lineset length and vapor tube diameter. The user
interface (UI) will now display the required charge adjustment (see Fig. 9) for the lineset and an adjustment for a
large indoor coil if recognized as such by the UI.
2. Add or remove the required charge adjustment for lineset
length to liquid service valve.
Note: If lineset is less than 15 feet (--9.4_C), charge removal may be necessary.
3. Fully open liquid and vapor service valves.
Step 12 — System Functions And Sequence Of
Operation
The 25VNA models utilize an Infinity Communicating User
Interface (UI). With a call for cooling, the outdoor fan and
compressor are energized 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 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.
When the outdoor ambient is more the 100_F (37.8_C), the
outdoor fan will continue to run for one minute after compressor
shuts off. This reduces pressure differential for easier starting in
the next cycle.
The conventional thermostat inputs is designed to work for
emergency operation only. Connections are Y, O and C. The
system will only operate at maximum capacity, heating or cooling.
The user interface (UI) displays the operation mode and fault codes
as specified in the troubleshooting section. See Table 5 for codes
and definitions.
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 access via the UI.
8
Communication and Status Function Lights
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.
NOTE: Contactor may close intermittently without the unit
starting. This is done to determine whether the control needs to
energize the crankcase heater. Closing the contactor powers the
inverter and allows the system to check compressor temperature.
Outdoor Fan Motor Operation
The outdoor unit control (Fig. 11) energizes outdoor fan anytime
compressor is operating, except for defrost and as needed during
low--ambient cooling operation. The outdoor fan remains
energized if a pressure switch opens or compressor scroll over
temperature should occur. This OD fan is an ECM motor which
operates at varying speeds depending on the ambient and the
demand.
Infinity Control, Green Communications (COMM)Light
A green LED (COMM light) on the outdoor board (see Fig. 11)
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.
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.
S One minute time delay of outdoor fan at termination of cooling
mode when outdoor ambient is greater than or equal to 100_F
(37.8_C).
S Fifteen second delay at termination of defrost before the
auxiliary heat is de--energized.
Time Delays
The unit time delays include:
S Five minute time delay to start cooling or heating operation
when there is a call from the user interface. To bypass this
feature, momentarily short and release Forced Defrost pins.
S Five minute compressor re--cycle delay on return from a
brown--out condition.
S See Tab le 7 for other delay information.
General Information
Infinity Controlled low ambient cooling:
This unit is capable of low ambient cooling down to 0_F
(--17.8_C) with Low Ambient enabled on the Infinity Control. A
low ambient kit is not required.
The Infinity Control provides an automatic evaporator coil freeze
protection algorithm that eliminates the need for an evaporator
freeze thermostat. The only accessory that may be required is wind
baffles in locations which are likely to experience cross winds in
excess of 5 miles an hour. This generally occurs only on roof and
open area applications.
Low ambient cooling must be enabled in the User Interface setup.
Fan may not begin to cycle until about 40_F (4.4_C) OAT. The
outdoor unit fan will cycle on and off based on outdoor coil
temperature, outdoor air temperature, and suction pressure
measurements to keep the compressor running at the proper
conditions.
Utility Interface With Infinity Control
The utility curtailment relay should be wired between the two
UTIL connections on the control board for this Infinity
Communicating System (see Fig. 20). 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 will display, ”Curtailment Active”. See UI
installation instructions for setup details.
STATUS
LED
COMM
LED
A11139
Fig. 11 -- Variable Speed Control Board
Defrost
This user interface (UI) offers 5 possible defrost interval times: 30,
60, 90, 120 minutes, or AUTO. The default is AUTO.
Defrost interval times: 30, 60, 90, and 120 minutes or AUTO are
selected by the Infinity Control User Interface (dip switches are not
used.)
AUTO defrost adjusts the defrost interval time based on the last
defrost time as follows:
S When defrost time <3 minutes, the next defrost interval=120
minutes.
S When defrost time 3--5 minutes, the next defrost interval=90
minutes.
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.
9
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 > 35F (+1.67C), defrost terminates if outdoor
coil temperature > 50F (+10C).
S When OAT ≤ 35F (+1.7C), defrost will terminate if OCT is
>45F (+4.4C).
S Or 10 minutes has passed.
At the defrost termination, the outdoor fan output (ODF) will turn
on 15 seconds before the reversing valve switching.
NOTE: Compressor speed during defrost varies based on outdoor
conditions.
Step 13 — Check Charge
Charge in CHARGING mode
Factory charge amount and desired subcooling are shown in the
user interface (UI). To properly check or adjust charge, conditions
must be favorable for subcooling charging in cooling mode.
Favorable conditions exist when the outdoor temperature is
between 65_F and 100_F (18_C and 38_C), and the indoor
temperature is between 70_F and 80_F (21_C and 27_C). If the
temperatures are outside of these ranges, weigh--in charge only. If
confirmation is needed return and check subcooling when the
temperatures are within the desired range.
Charging Procedure: Unit is factory charged for 15ft (4.57 m) of
lineset and for smaller rated indoor coil combinations. If any
refrigerant charge adjustment is required based on the indoor coil
combination you select and the line set length you input, the UI
will calculate and display the target subcooling and the amount of
additional charge to be added. Therefore 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, and an
additional amount of refrigerant charge adjustment (2 lbs) for a
large ID coil if required, is calculated and displayed by the UI.
Perform a final charge check only when in cooling and OD is
between 65F (18C) and 100F (38C).
NOTE: UI indicates acceptable conditions if outside of this range.
Do not charge if outside 65F (18C) and 100F (38C) outdoor
temperature.
If the range is acceptable, go the CHARGING screen in the user
interface (UI). At cooling conditions, set the user interface (UI) to
check the charge in cooling mode. Allow system to operate in
cooling mode for the stabilization period as indicated in the user
interface (UI). Once conditions are indicated as favorable and
stable by the user interface (UI), check the system charge by
subcooling method. Compare the subcooling taken at the liquid
service valve to the subcooling target (LiqLin SC TGT) listed on
the charging screen. Add refrigerant if the subcooling is low and
remove charge if subcooling is high. Tolerance should be 2F.
If any adjustment is necessary, add or remove the charge slowly
(no greater than 0.5 lb per minute) and allow system to operate for
15 minutes to stabilize before declaring a properly charged system.
The use of a commercial charge metering device (restrictor) such as
Imperial liquid low side charger model 535--C or Watsco
ChargeFaster model CH200 is recommended when adding
refrigerant to an operating system. This prevents potential damage
of liquid slugging of the compressor and allows the subcooling to
stabilize quicker.
If the indoor temperature is above 80_F (26.67_C), and the
outdoor temperature is in the favorable range, adjust system charge
by weight based on line length and allow the indoor temperature to
drop to 80_F (26.67_C) before attempting to check system charge
by subcooling method as described above.
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) only. Charge level should then
be appropriate for the system to achieve rated capacity. The charge
level could then be checked at another time when the both indoor
and outdoor temperatures are in a more favorable range. This
ensures maximum efficiency and reliability.
Heating Check Chart Procedure
In heating mode, the required charging method is by weigh--in. On
new installation or complete recharge, refer to the REQUIRED
CHARGE CALCULATION screen in the user interface (UI) to
obtain the required charge adjustment and/or total charge required.
Use the UI and Heating Check Charts (Fig. 12 and 13) to check
system operation during HEATING mode. The indoor conditions
must be between 60F (15.6_C) and 80F (26.7_C) to check the
charge. The outdoor coil must be dry and ice/frost free. Do not
check for pressure agreement if the outdoor has rain, mist or snow
present.
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:
1. Place the system in EFFICIENCY mode by selecting
Service--> Setup--> Furnace or Fan Coil--> AC/HP Airflow,
for proper ID airflow during verification of system
pressures against those shown on the Heating Check Chart.
2. Go to Service--> Checkout--> Heating. Choose 25 minutes
and Choose Speed % consistent with 3200 compressor
RPM for 2T or 3T, and 3450 compressor RPM for 4T or
5T. The Speed % selection can be an iterative process that
may require more than a single try at starting to arrive at the
RPM required, allowing a tolerance of 50 RPM.
3. Upon starting the heating checkout mode at the proper compressor RPM, keep it running frost free for 20 minutes before checking the pressures against the Heating Check Chart
label.
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. IF CHARGE
IS IN DOUBT, REMOVE CHARGE AND WEIGH--IN
CORRECT CALCULATED 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.
NOTE: In heating mode, check refrigerant pressures only when
user interface is engaged in Checkout-->Heating mode. Upon
completing the Charge verification in Checkout mode, place the
system back in Comfort mode ID airflow by choosing:
Service-->Setup-->Furnace or Fan Coil-->AC/HP Airflow, and
choosing Comfort. This is required, unless the system was
previously deliberately placed in Efficiency or other modes.
10
Charging In Cooling Mode - 25VNA024/036
Charging In Cooling Mode - 25VNA048/060
See user interface set in Charging Mode
See user interface set in Charging Mode
Heating Check Chart - 25VNA024/036
)
1ºC)
70ºF ID (2
C)
(16º
60ºF ID
250
3102
2413
400
2757
2068
350
1724
200
1380
150
1034
100
690
Suction Pressure
0
20
30
40
50
(-10ºC)
(4ºC)
(10ºC)
Outdoor Ambient Temperature ºF (ºC)
60
(16ºC)
A11140
If this system requires either a Pump Down or Evacuation for any
reason, the procedures below must be followed:
Pump Down
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. The UI (User Interface) has provisions to assist in performing
this function.
1. Connect gages to 25VNA liquid and vapor or suction capillary service 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 pumpdown 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 pumpdown is complete when the
suction pressure drops below 0 psig. Compressor protections are still active to prevent damage to the compressor or
inverter (high pressure, high current, high torque, scroll
temperature, etc.) .
7. Once system indicates pumpdown complete or failure to
complete shutdown, close vapor service valve.
8. If pumpdown does not complete due to compressor safety
shutdown, 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.
1724
690
345
0
10
(-12ºC)
20
(-7ºC)
30
40
(-10ºC)
(4ºC)
Outdoor Ambient Temperature ºF (ºC)
50
(10ºC)
60
0
(16ºC)
A11141
25VNA048/060 Heating Pressure check Chart (Psig)
Indoor Temperature (_F)
OD DB
60
70
80
(_F)
High
Low
High
Low
High
Low
60
324
121
360
120
407
121
50
293
99
333
100
380
102
40
277
87
307
80
360
88
30
257
69
288
65
333
69
20
242
57
281
60
320
60
10
232
50
263
47
306
50
0
218
42
253
43
288
42
Fig. 12 -- Heating Pressure Check Chart 25VNA024/036
Step 14 — Pumpdown & Evacuation
2068
6ºC)
Suction Pressure
(-18ºC)
25VNA024/036 Heating Pressure check Chart (Psig)
Indoor Temperature (_F)
OD DB
60
70
80
(_F)
High
Low
High
Low
High
Low
60
290
129
329
130
368
132
50
263
106
303
108
346
110
40
245
89
285
90
324
90
30
232
74
270
81
312
87
20
222
69
256
68
291
64
10
212
55
246
52
281
53
0
203
49
238
43
270
50
60ºF ID (1
1034
100
0
(-7ºC)
2413
)
1380
0
10
70ºF ID (21ºC
150
50
(-12ºC)
)
200
345
0
80ºF ID (27ºC
250
50
(-18ºC)
Vapor Service
Valve Pressure
300
Refrigerant Pressure (KPa)
80ºF ID (27ºC
Vapor Service
Valve Pressure
300
450
Refrigerant Pressure (psig)
350
For use in Heating Charging Mode only
2757
Refrigerant Pressure (KPa)
400
Refrigerant Pressure (psig)
Heating Check Chart - 25VNA048/060
For use in Heating Charging Mode only
Fig. 13 -- Heating Pressure Check Chart 25VNA048/060
NOTE: A small quantity of charge remains in the OD unit that
must be manually recovered if isolating refrigerant to indoor coil
and lineset via HEAT mode PUMP DOWN.
Evacuation and Recovery of Refrigerant from within
25VNA
Because this system has an EXV for the heating expansion device,
additional steps must be taken to open the EXV if the heat pump
unit must be evacuated for service reasons. 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 gages to 25VNA liquid and vapor or suction capillary service ports to monitor operating pressures during and
at completion of the procedure. Attach recovery system or
vacuum pump to gage 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.
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.
11
MAJOR COMPONENTS
TROUBLESHOOTING
Variable speed Control Board
Systems Communication Failure
The HP control board controls the following functions:
S Compressor speed
S Contactor operation
S Outdoor fan motor operation
S Reversing valve operation
S Defrost operation
S Low ambient cooling
S Crankcase heater operation
S Pressure switch monitoring
S Time Delays
S .Pressure Transducer
S .EXV operation control
S .Inverter communication and control
If communication with the Infinity control 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 3).
Table 3 – Model Plug Information
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 to the demanded RPM. When the contactor closes, it
powers the inverter with line voltage. The inverter changes the line
voltage to 410 volts DC 3--phase, and varies the frequency to drive
the compressor at the desired RPM.
NOTE: Manually closing the contactor will not cause the unit to
operate. The unit must be operated with an Infinity Control. A
standard thermostat will allow operation only in the emergency
mode (high speed heating or cooling).
Variable Speed Compressor
This unit contains a variable speed compressor that has a wide
operating range. It operates on 410vdc provided by the inverter.
This compressor can only be operated by the specific inverter
supplied with the unit.
!
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 Control Service mode allows for manual opening and
closing of the EXV for troubleshooting and pump down.
Field control Connections
For normal operation use the ABCD Infinity connections only.
Only two wires, AB are required. See Fig. NO TAG. Discrete
inputs (Y,C, O) are available for emergency operation if the Infinity
Bus is not in operation.
Pressure Transducer (SPT)
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 control board for low pressure
cut--out, loss of charge management, compressor overall envelope
management, oil circulation management, lubrication management
and EXV control. (See Fig. 17.)
PIN RESISTANCE
(K--- ohms)
MODEL
NUMBER
MODEL PLUG
NUMBER
Pins 1--- 4
Pins 2--- 3
25VNA024
HK70EZ001
5.1K
11K
25VNA036
HK70EZ002
5.1K
18K
25VNA048
HK70EZ003
5.1K
24K
25VNA060
HK70EZ004
5.1K
33K
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 input into the
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 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.
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.
Pressure Switch Protection
The outdoor unit is equipped with high pressure switch. If the
control senses the opening of a high pressure switch, it will
respond as follows:
1. De--energize the contactor.
2. Keep the outdoor fan operating for 15 minutes.
3. Display the appropriate fault code (see Table 7).
4. After a 15 minute delay, if there is a call for cooling or heating and HPS is reset, the contactor is energized.
5. If HPS has not closed after a 15 minute delay, the outdoor
fan is turned off. If the open switch closes anytime after the
15 minute delay, then resume operation with a call for cooling or heating at a temporary reduced capacity.
6. If HPS trips 3 consecutive cycles, the unit operation is
locked out for 4 hours.
7. 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.
8. 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.
Compressor Control Contactor
The contactor has a 24 volt coil. The electronic control board
controls the operation of the contactor.
12
Brown-- Out Protection
If the line voltage is less than 187v for at least 4 seconds, the
contactor and fan relay are de--energized. 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
If there is no 230v at the contactor when the indoor unit is powered
with a cooling or heating demand, the appropriate fault code is
displayed. Verify the disconnect is closed and 230v wiring is
connected to the unit.
Inverter Voltage Sensing
The control board senses the presence or absence of 230 V through
the feedback from inverter. The control monitors the high voltage
to the inverter. Voltage should be present anytime the contactor is
energized and voltage should not be present when the contactor is
de--energized.
Temperature Thermistors
Thermistors are electronic devices which sense temperature. As the
temperature increases, the resistance decreases. Thermistors are
used to sense outdoor air (OAT), coil temperature (OCT) and the
suction line thermistor (OST) located between the reversing valve
and the accumulator.
Refer to Table 4 and Fig. 14 for resistance values versus
temperature.
Table 4 – Resistance Values versus Temperature
TEMPERATURE
RESISTANCE (ohms)
25.0° C (77.0° F)
10.0 + / - 2.3%
0.0° C (32.0° F)
32.6 + / - 3.2%
-28.0° C (-18.4° F)
85.5 + / - 3.4%
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, low ambient cooling will not be
allowed and the one--minute outdoor fan off delay will not occur.
Defrost will be initiated based on coil temperature and time.
If the OCT sensor should fail, low ambient cooling will not be
allowed. Defrost will occur at each time interval during heating
operation, but will terminate after 5 minutes.
If there is a thermistor out--of--range error, defrost will occur at
each time interval during heating operation, but will terminate after
5 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
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. 15 for proper placement. See Table 4 for
proper resistances.
OAT Thermistor must be
locked in place with
spherical nib end facing
towards the front of the
control box
THERMISTOR CURVE
90
RESISTANCE (KOHMS)
80
70
60
50
40
30
20
10
0
0
20
40
60
80
TEMPERATURE (DEG. F)
100
120
A11142
A91431
Fig. 14 -- Thermistor Resistance Versus Temperature
Fig. 15 -- OAT Thermistor Location (Bottom of Control Box)
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. 15, 16 and 17).
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
 20_F ( 11_C) cooler than the coil sensor, the sensors are out
of range.
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.
A14303
Fig. 16 -- Outdoor Coil Thermistor (OCT) Attachment
(On Distributor Tube)
13
ECM Fan Motor
PRESSURE TRANSDUCER (SPT)
ACCUMULATOR TUBE
SUCTION TUBE
COMPRESSOR
SUCTION THERMISTOR (OST)
ACCUMULATOR
REVERSING VALVE
If verification of proper operation is required for the ECM motor
used in this unit, follow these steps:
1. Verify that the 230v input to the transformer is present.
2. Verify that the control board is powered 18 volts to 30 volts
from the transformer.
3. With the UI in charging mode in cooling, measure the DC
voltage between the PWM 1 and PWM 2 terminals on the
outdoor control board. The DC voltage and PWM (optional) measured must be as shown in Table 6.
Table 6 – DC Voltage and PWM Measurement
SUCTION SERVICE VALVE
A11103
Fig. 17 - Suction Thermistor (OST) Attachment
(On Suction Tube)
Suction Thermistor (OST)
Suction Thermistor is used for assisting in EXV control and must
be secured on the suction tube and aligned longitudinally to the
vertical surface of the tube axis (see Fig. 17).
!
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.
Variable Speed Compressor Sensor Output Terminals
This compressor has a motor thermistor and a scroll thermistor.
Correct resistance between scroll thermistor terminal and common
is 10k at 77_F (25_C). Correct resistance between motor
thermistor terminal and common is 5k at 77_F (25_C).
.681
.203
Between terminal &
ground
>1 mega OHM
>1 mega OHM
!
11.1 VDC
84
In an emergency, it is possible to replace the UI with a
conventional heat pump thermostat (must be dual fuel capable if
using a furnace), see Fig. NO TAG for wiring. However, this
emergency mode operation is limited to a single, maximum
compressor speed in heating and a single maximum cooling speed.
(winding resistance at 70_F 20_F)
Between terminals
T1, T2, and T3
52
048, 060
Emergency Mode Connections with a Conventional
Dual Fuel Thermostat
Table 5 – Variable Speed Compressor Resistances
25VNA048
25VNA060
PWM
8.9 VDC
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.
This compressor operates with a 3--phase variable frequency PWM
variable voltage to the three fusite terminals.
25VNA024
25VNA036
Voltage
024, 036
Status Codes
Variable Speed Compressor Power Input Terminals
WINDING
Unit Size
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.
14
User Interface (UI)
Furnace or Fan Coil
VS HP
No
Use
D
D
C
C
B
B
B
A
A
A
C and D
not required on
VS Heat Pump
O
Y
R
OAT
C
HUM
24vac C
C
W
Humidifier
A12055
Fig. 18 -- Infinity Furnace or Fan Coil Wiring with Communicating Variable Speed HP
VS HP
A
A
B
B
C
D


OAT
C
R
IL
G
C
W
LS
Y
Y
O
UT
O
HUM
C
R
G
C
O
Y
W
Conventional
Dual-Fuel
Thermostat
Furnace or Fan Coil
A11382
Fig. 19 -- Variable Speed Unit Connected to a Conventional Dual Fuel Thermostat in an Emergency Mode
15
BRN
RED
SEC2
SEC1
PL5
1
EXV
YEL
BLU
PWM2
CC
PWM1
PL4
PL3
SPT
HPS
PL11
CB
PL2
OST
RVS
PL6
INVERTER
PL1
OCT
OAT
COMM STATUS
UTIL C LS Y O
PL8
A B C NO
USE
J2
FORCED
DEFROST
MODEL
Utility Interface*
A11544
Fig. 20 -- Variable Speed Control Board
with optional Utility Relay
BRN
RED
SEC1
PL5
1
EXV
SEC2
PWM2
CC
YEL
BLU
PWM1
PL4
PL3
SPT
HPS
PL11
CB
PL2
OST
RVS
PL6
INVERTER
PL1
OCT
OAT
COMM STATUS
UTIL C LS Y O
A B C NO
USE
PL8
MODEL
J2
FORCED
DEFROST
LLS
A11379
Fig. 21 -- Variable Speed Control Board connected to optional Liquid Line Solenoid.
16
Table 7 – Troubleshooting
FAULT/OPERATION DESCRIPTION
Standby
Variable Capacity or Emergency Mode
Variable Speed Range Cutback
FLASH CODE
(Amber LED)
RESET TIME
(minutes)
ON, no flash
--- ---
1, pause
--- ---
1 (2 sec ON), longer pause (1 second OFF)
--- ---
Communications Loss
16
N/A
Invalid Model
25
N/A
High Pressure Switch Open
31
15
Low Pressure Trip
32
15
Control Fault
45
N/A
Brownout Event
46
Revert to 5 min cycle delay
Lost Inverter Communications
48
Revert to 5 min cycle delay
230VAC Dropout--- Reset Event
49
Revert to 5 min cycle delay
Outdoor Air Temp Sensor Fault
53
N/A
Suction Temp Sensor Fault
54
N/A
Coil Temp Sensor Fault
55
N/A
OAT--- OCT Thermistor Out of Range
56
N/A
Suction Pressure Sensor Fault
57
N/A
Suction Thermistor Range Fault
58
N/A
Compressor Scroll Temp Out of Range Event
59
15
Compressor No Start*
62
15
Compressor Sump Heater Active
68
NA
Inverter / Compressor Internal Fault
69
5
Compressor Motor Temp Out of Range Event
71
5
Suction Over Temp Event
72
5
Inverter Temp Out of Range Event
75
5
Inverter Over Current Event
77
5
Compressor No--- Pump Event
79
5
Suction Over Temp Lockout
82
4 Hours
Low Pressure Lockout for 4 Hours
83
4 Hours
High Pressure Lockout for 4 Hours
84
4 Hours
Compressor Temp Lockout
85
4 Hours
Compressor Lost Rotor or Temp Sensor Fault**
86
15
Inverter Temp Lockout
88
4 Hours
Inverter VDC --- Out Over Voltage Event
91
15
Inverter VDC --- Out Under Voltage Event
92
15
230VAC Under Voltage Event
93
15
230VAC Over Voltage Event
94
15
High Current Lockout
95
2 Hours
VDC Under Voltage Lockout
96
2 Hours
VDC Over Voltage Lockout
97
2 Hours
High Torque Event
98
10
99
2 Hours
OFF
N/A
High Torque Lockout
--- --* Fault code present software V6 and later
** Fault code present software V5 and earlier
17
FINAL CHECKS
IMPORTANT: 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 Users 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.
Copyright 2014 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Edition Date: 04/14
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
18
Catalog No: 25VNA ---5SI
Replaces: 25VNA--- 4SI
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