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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 5 — Elevate Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 4
Step 6 — Liquid Line Solenoid Valve (LSV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 7 — Making Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4--6
Step 8 — Make Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 9 — Compressor Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 10 — Install Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 11 — Start--Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 12 — System Functions and Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8--9
Step 13 — Check Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9--10
Step 14 — Pumpdown & Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
MAJOR COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12--15
FINAL CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
PURONr REFRIGERANT QUICK REFERENCE GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Indoor Thermostat Control Options
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.
25VNA
Yes*
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
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.
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.
Infinity
Control
* Requires model SYSTXCCUID01 ---V or SYSTXCCUIZ01 ---V or newer.
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
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.
2
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).
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.
!
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.
OUTDOOR WALL
INDOOR WALL
CAULK
LIQUID TUBE
SUCTION TUBE
INSULATION
THROUGH THE WALL
JOIST
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
INSULATION
SUCTION TUBE
Adjust refrigerant charge by adding or removing the charge
to/from the unit depending on lineset length and indoor unit.
Adjust by 0.6 oz/ft of actual lineset length. 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.
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, 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.
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 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. 2
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.
Step 3 — Clearance Requirements
1” (25.4 mm)
MIN
LIQUID TUBE
SUSPENSION
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.
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
3/8--- in. (9.53 mm) Dia.
Tiedown Knockouts in
Basepan(2) Places
Furnace or
Fan Coil
User Interface
A
B
Green
Yellow
White
C
Red
D
S1
S2
Variable
Speed
HP
A
A
B
B
C
D
ABCD
Connection (optional)
C
D
LLS
Optional Remote
Room Sensor
C
View From Top
LS
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)
A11107
Fig. 3 -- Liquid Line Solenoid Electrical Connection
(Required for long line applications)
28–7/16 (722.3)
Fig. 2 -- Tiedown Knockout Locations
Step 7 — Make Piping Connections
Step 4 — Operating Ambient
WARNING
!
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).
PERSONAL INJURY AND UNIT DAMAGE
HAZARD
Step 5 — Elevate Unit
Failure to follow this warning could result in personal injury or
death.
Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit.
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.
!
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Do not allow water and/or ice to build up in base pan.
!
CAUTION
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.
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.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Step 6 — In Long--Line Applications, Install
Liquid--Line Solenoid Valve (LSV)
For refrigerant piping arrangements with equivalent lengths 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 all
requirements of the Residential Piping and Long--Line Guideline.
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 16 and
by following the Installation Instructions included with accessory
kit.
IMPORTANT: Flow arrow must point toward outdoor unit.
CAUTION
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 beyond 80 ft. (24.38
m), substantial capacity and performance losses can occur.
Following the recommendations in the Residential Piping and
Long--Line Guideline will reduce 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.)
UNIT SIZE
Connection
Diameter
LIQUID
Tube
Diameter
Connection
Diameter
VAPOR*
Max (Rated)
Diameter
Minimum Tube
Diameter
25VNA024
25VNA036
25VNA048
25VNA060
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
7/8
7/8
7/8
7/8
7/8
7/8
1--- 1/8
1--- 1/8
5/8
5/8
3/4
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 linesets.
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 or
20 ft. (6.1 m) vertical differential, refer to the Residential Piping and Longline Guideline using Puron refrigerant.
Table 2 – Accessory Usage
ACCESSORY
Crankcase Heater
Evaporator Freeze Protection
Liquid --- Line Solenoid Valve
Low--- Ambient Control
Puron Refrigerant Balance Port
Hard --- ShutOff TXV
Support Feet
Winter Start Control
EMI Kit
REQUIRED FOR
LOW --- AMBIENT COOLING
APPLICATIONS
(Below 55°F/12.8_C)
Standard
Standard with Infinityt Control
No
Standard with Infinity Control
REQUIRED FOR LONG LINE
APPLICATIONS*
(Over 80 ft/24.38 m)
REQUIRED FOR SEA
COAST APPLICATIONS
(Within 2 miles/3.22 km)
Standard
Standard
No
No
No
Installations with Radio
Frequency Interference
Concerns in the Range
of 2 to 30 MHZ
Standard
No
No
No
No
Yes
No
Yes{
Yes{
Yes{
Yes{
Recommended
Standard with Infinity
Control
No
No
Standard with Infinity
Control
No
Recommended
Standard with Infinity
Control
No
No
Standard with Infinity
Control
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), refer to the Long
Line Guideline—Air Conditioners and Heat Pumps using Puron® Refrigerant.
{ 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.
Outdoor Unit Connected to Factory-- Approved Indoor
Unit
Factory Supplied Muffler (part # LM10KK003)
Installation is Required On Every Installation:
Outdoor unit contains correct system refrigerant charge for
operation with factory--approved, AHRI--rated indoor unit with
highest sales volume 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.
S A muffler is required to reduce noise transmitted to indoor
through the line set.
S Muffler may be installed in the vertical or the horizontal
direction, maintaining at least 12 in. (304.8 mm) straight pipe
length from the OD unit (See Fig 4).
S Maintain at least 12 in. (304.8 mm) to any bend from the muffler
shell inlet and outlet stubs.
Install Liquid-- Line Filter Drier Indoor
Refer to Fig. 5 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.
!
EXTERIOR
WALL
12” (304.8 mm) MIN
MUFFLER
CAUTION
12” (304.8 mm) MIN
TO DWELLING
VAPOR SERVICE VALVE
UNIT DAMAGE HAZARD
12”
(304.8 mm) MIN
VAPOR LINE
EXTERIOR
WALL
Failure to follow this caution may result in unit damage or
improper operation.
Installation of filter drier in liquid line is required.
MUFFLER
TO DWELLING
VAPOR SERVICE VALVE
12”
(304.8 mm) MIN
VAPOR LINE
A11108
Fig. 4 -- Muffler Installation
5
5000
4500
4000
3500
3000
2500
MICRONS
LEAK IN
SYSTEM
2000
1500
1000
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
500
0
1
A05227
Fig. 5 -- Liquid--Line Filter Drier
Refrigerant Tubing connection Outdoor
Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 1).
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
!
CAUTION
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.
7
A95424
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.
S Use a brazing shield
S Wrap service valves with wet cloth or heat sink material.
!
6
A95424
Failure to follow this caution may result in equipment
damage or improper operation.
Evacuate Refrigerant Tubing and Indoor Coil
3
4
5
MINUTES
Fig. 6 -- Deep Vacuum Graph
UNIT DAMAGE HAZARD
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.
2
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.
!
Deep Vacuum Method
WARNING
ELECTRICAL SHOCK HAZARD
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. 6)
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.
6
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. 7.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
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.
CONTACTOR
FIELD POWER
WIRING
FIELD GROUND
WIRING
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.
Step 11 — Start--Up
GROUND
LUG
!
A91056
Fig. 7 -- Line Power Connections
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
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. 17).
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.
General Information
Use No. 18 AWG color--coded, insulated (35°C minimum) wire
for low voltage control wires.
All wiring must be NEC Class 1 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.
!
CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Final Wiring Check
Wear safety glasses, protective clothing, and gloves when
handling refrigerant.
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 when there is power to the
unit. Crankcase heat will not be energized when there is no
refrigerant in the system.
CAUTION
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.
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 figure 8) for the lineset. Additional adjustment
must be made for large indoor coils. See coil models and
charge adjustments required in Table 3.
2. Add or remove the required charge adjustment for lineset
length to liquid service valve. Note: If lineset is less than
15 feet, charge removal will be necessary.
3. Fully open liquid and vapor service valves.
Airflow Setup for Infinity Control Furnace or FE
Fan Coil (communicating)
This system can only be installed with Infinity indoor and user
interface (UI) SYSTXCCUID01--V or SYSTXCCUIZ01--V 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.
7
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.
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 check compressor temperature.
Outdoor Fan Motor Operation
A11104
Fig. 8 -- Required Charge Adjustment Calculated in UI
4. Set User Interface to operate cooling in CHARGING mode.
Charging mode operates system compressor speed and fan
speeds to proper conditions to check the refrigerant charge.
NOTE: 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 figure 9).
The outdoor unit control (Fig. 10) 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.
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 thermostat or 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.
General Information
Infinity Controlled low ambient cooling:
A11105
Fig. 9 -- Liquid Line Subcooling Target
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 the 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. Inputs are LS, 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.
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 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. The Infinity Control
provides an automatic evaporator freeze thermostat. 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. Fan will cycle based
on coil and outdoor air temperature.
Infinity controlled low ambient mode operates as follows:
S Fan is OFF when outdoor coil temperature is too low (+
55_F/12.7_C), the saturated suction pressure indicates a freezing
indoor coil or outdoor fan has been ON for 30 minutes. (Fan is
turned off to allow refrigerant system to stabilize.)
Communication and Status Function Lights
Infinity Control, Green Communications (COMM)Light
A green LED (COMM light) on the outdoor board (see Fig. 10)
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 6 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.
8
S Twenty second delay at termination of defrost before the outdoor
fan is energized (unless fan delay defeated).
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 when the coil temperature reaches
65_F (18.33_C) or 10 minutes has passed.
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).
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.
STATUS
LED
Step 13 — Check Charge
Charge in CHARGING mode
COMM
LED
A11139
Fig. 10 -- Variable Speed Control Board
S Fan is ON when outdoor coil temperature is too high
(+80_F/26.7_C), the high side pressure is too high or if outdoor
fan has been OFF for 30 minutes. (Fan is turned on to allow
refrigerant system to stabilize)
S Low pressure indication by the suction pressure transducer is
ignored for first 3 minutes during low ambient start up. After 3
minutes, if low pressure trip occurs, then outdoor fan motor is
turned off for 10 minutes, with the compressor running. If
pressure condition is satisfied within 10 minutes then cooling
continues with the outdoor fan cycling per the coil temperature
routine listed above for the remainder of the cooling cycle. If the
suction pressure condition is not satisfied within 10 minutes, then
the normal trip response (shut down cooling operation and
generate LP trip error) will occur.
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.
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.
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. Charge is adjusted by 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 indoor coil size. The amount for the lineset is calculated in the
user interface under REQUIRED CHARGE CALCULATION
screen. The lineset length and vapor line diameter must be entered
correctly. The liquid line size must be 3/8” OD. If the liquid line
and vapor line differ in length, use the liquid line length. Charge
must be adjusted for large coils, see Table 3.
EXAMPLE:
To calculate additional charge required for a 25VNA048 with
25--ft. line set and CNPVP6024 indoor coil:
Since ID coil CNPV--6024 is listed in Table 3a, adjust by an
additional 1 lb.
(25 ft. -- 15 ft.) X 0.6 oz./ft. + (1 lb) x 16oz/lb = 22 oz.
A total of 22 oz of charge must be added, then fine adjust based
on target subcooling listed on user interface (UI).
Table 3 – Large Coils – Charge Adjustment
25VNA
Fan Coils
060
FE4 --- --- ---006
048
036
024
NOTE:
Furnace Coils
Charge Adjust
for ID Coil
+1 lb
CNP(H,V) ---6124
CNP(H,V) ---6124
CNP(H,V) ---6024
+1 lb
CSPH ---6012
CNP(H,V) ---6124
FE4 --- --- ---005
CNP(H,V) ---6024
+1.5 lb
FE4 --- --- ---006
CNPH ---6012
Adjust charge as indicated on systems with coils listed in Large
Coil Table
FE4 --- --- ---005
FE4 --- --- ---006
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 outside65°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
9
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 (Figures 11 and 12) 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, the user interface (UI) must be in
CHARGING mode. 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.
NOTE: In heating mode, check refrigerant pressures only when
user interface is in CHARGING mode and indicates stable. If
charge is in doubt, remove charge and weigh--in correct calculated
refrigerant charge.
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)
ºF ID (16º
60
250
200
3102
2413
400
2757
2068
350
1724
1380
150
1034
100
690
Suction Pressure
30
40
50
(-10ºC)
(4ºC)
(10ºC)
Outdoor Ambient Temperature ºF (ºC)
60
(16ºC)
100
A11140
1724
690
Suction Pressure
345
0
(-18ºC)
25VNA024/036 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
300
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
2068
6ºC)
1034
0
20
60ºF ID (1
150
0
(-7ºC)
2413
)
1380
0
10
70ºF ID (21ºC
200
50
(-12ºC)
)
250
345
0
80ºF ID (27ºC
300
50
(-18ºC)
Vapor Service
Valve Pressure
Refrigerant Pressure (KPa)
)
450
Refrigerant Pressure (psig)
80ºF ID (27ºC
Vapor Service
Valve Pressure
300
For use in Heating Charging Mode only
2757
Refrigerant Pressure (KPa)
350
Refrigerant Pressure (psig)
Heating Check Chart - 25VNA048/060
For use in Heating Charging Mode only
400
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. 11 -- Heating Pressure Check Chart 25VNA024/036
Fig. 12 -- Heating Pressure Check Chart 25VNA048/060
10
Step 14 — Pumpdown & Evacuation
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 EXV for the heating expansion device,
conventional procedures 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 Heat Pump > Checkout > 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.
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 HEAT PUMP >
CHECKOUT > 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 8). 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 or the system to operate properly (see Table
4).
Table 4 – 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
Use the ABCD Infinity connections only. Only two wires, AB are
required. See Fig. 16.
Compressor Internal Relief
This compressor is not protected by an internal pressure relief
(IPR), instead, this protection is provided by the system high
pressure switch and the compressor torque management through
the inverter. The compressor is also protected by a scroll
over--temperature protection.
Compressor Control Contactor
The contactor has a 24 volt coil. The electronic control board
controls the operation of the contactor.
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 compressor contactor.
2. Keep the outdoor fan operating for 15 minutes.
3. Display the appropriate fault code (see Table 8).
4. After a 15 minute delay, if there is a call for cooling or heating and HPS is reset, the compressor 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 8). The control board should
be replaced.
12
Brown-- Out Protection
If the line voltage is less than 187v for at least 4 seconds, the
compressor 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
8).
230V Line (Power Disconnect) Detection
If there is no 230v at the compressor 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 continuously monitors the
high voltage to the inverter. Voltage should be present anytime the
compressor 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 5 and Fig. 13 for resistance values versus
temperature.
Table 5 – 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%
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 8.
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 8 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 figure 14 for proper placement. See table 5 for
proper resistances.
THERMISTOR CURVE
OAT Thermistor must be
locked in place with
spherical nib end facing
towards the front of the
control box
90
RESISTANCE (KOHMS)
80
70
60
50
40
30
20
10
0
0
20
40
60
80
TEMPERATURE (DEG. F)
100
120
A91431
Fig. 13 -- Thermistor Resistance Versus Temperature
If the outdoor air or coil thermistor should fail, the control will
flash the appropriate fault code (see Table 8.)
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. 14, 15 and 16).
A11142
Fig. 14 -- OAT Thermistor Location (Bottom of 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
≥ 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)
OCT SENSOR
LOCATION
A11143
Fig. 15 -- 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 7.
Table 7 – DC Voltage and PWM Measurement
SUCTION SERVICE VALVE
A11103
Fig. 16 - 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. 16).
!
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.
Terminals
Voltage
PWM
2T and 3T
8.9 VDC
52
4T and 5T
11.1 VDC
84
Status Codes
Table 8 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 8 shows this to be low pressure switch open.
Furnace or Fan Coil
25VNA HP
Variable Speed Compressor Sensor Output Terminals
D
D
D
C
C
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).
B
B
B
A
A
A
Variable Speed Compressor Power Input Terminals
.203
Between terminal &
ground
>1 mega OHM
>1 mega OHM
!
O
W
C
.681
HUM
Between terminals
T1, T2, and T3
Humidifier
24vac C
25VNA048
25VNA060
Y
Table 6 – Variable Speed Compressor Resistances
(winding resistance at 70_F 20_F)
25VNA024
25VNA036
C
R
This compressor operates with a 3--phase variable frequency PWM
variable voltage to the three fusite terminals.
WINDING
C and D
not required on
25VNA Heat Pump
OAT
User Interface (UI)
A11144
Fig. 17 -- Infinity Furnace or Fan Coil Wiring with Communicating Variable speed HP
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
Table 8 – Troubleshooting
FLASH CODE
(AMBER LED)
RESET TIME
(minutes)
--- ---
Standby
ON, no flash
--- ---
Variable Capacity or Emergency
Mode
1, pause
--- ---
Variable Speed Range Cutback
FAULT DESCRIPTION SENT TO UI
1 (2 sec ON), longer pause
second OFF)
Communications Loss
16
NA
Invalid Model
25
NA
High Pressure Switch Open
31
15
Low Pressure Trip
32
15
Control Fault
45
NA
Brownout
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
NA
Suction Temp Sensor Fault
54
15
Coil Temp Sensor Fault
55
NA
OAT ---OCT Thermistor Out of range
56
NA
Suction Pressure Sensor Fault
57
15
OAT ---OST Thermistor Out of range
58
5
Compressor Scroll Temp Out of Range
59
15
Compressor Sump Heating Active
68
2 HOURS
Inverter / Compressor Internal Fault
69
15
Compressor Motor Temp Out of Range
71
15
Suction Over Temperature
72
15
Inverter Temp Out of Range Event
75
15
Inverter Over Current
77
15
Compressor No---Pump Event
79
15
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 Temp Sensor Fault
86
15
Inverter Temp Lockout
88
4 HOURS
Inverter VDC ---Out Over Voltage
91
15
Inverter VDC ---Out Under Voltage
92
15
230VAC Under Voltage
93
15
230VAC Over Voltage
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
High Torque Lockout
99
2 HOURS
OFF
NA
--- ---
15
(1
FINAL CHECKS
CARE AND MAINTENANCE
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.
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 2011 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 05/11
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
16
Catalog No: 25VNA ---2SI
Replaces: 25VNA--- 1SI

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