Carrier 25VNA Product Data

6
ACCESSORY USAGE GUIDELINE
ACCESSORY
REQUIRED FOR
LOW---AMBIENT COOLING APPLICA-
TIONS
(Below 55°F/12.8_C)
REQUIRED FOR LONG LINE AP-
PLICATIONS*
(Over 80 ft/24.38 m)
REQUIRED FOR SEA COAST
APPLICATIONS (Within 2
miles/3.22 km)
Crankcase Heater Standard
Standard
Standard
Evaporator Freeze Protection Standard with Infinityt Control No No
Liquid---Line Solenoid Valve No
Yes
No
Low--- Ambient Control Standard with Infinity Control No No
Puron Refrigerant Balance P ort Hard ---
ShutOff TXV
Ye s {
Ye s {
Ye s {
Support Feet Recommended No Recommended
Winter Start Control Standard with Infinity Control No No
* For tubing set l engths between 80 and 200 f t. (24.38 and 60.96 m) horizontal or 20 f t. (6.10 m) vertical differential (total equivalent length), refer to the Long
Line Guideline—Air Conditioners and Heat Pumps u sing Puron® Refrigerant.
{ Required on all indoor units. Standard on all new Greenspeed™ compatible fan coils and furnace coils.
Accessory Description and Usage (Listed Alphabetically)
1. Compressor Start Assist
The inverter drive gently starts the variable speed compressor at all
times. No other start device is compatible with this unit.
2. Crankcase Heater
Compressor motor winding resistance heater which is internal to
compressor to keep the lubricant warm during off cycles. Improves
compressor lubrication on restart and minimizes the chance of
liquid slugging.
Usage:
Used in low ambient cooling applications.
Used in long line applications.
3. Liquid--Line Solenoid Valve (LLS)
An electrically operated shutoff valve which stops and starts
refrigerant liquid flow in response to compressor operation. It is to
be installed at the outdoor unit to control refrigerant off cycle
migration in the heating mode.
Usage Guideline:
An LLS is required in all long line heat pump
applications to control refrigerant off cycle migration in
the heating mode. See Long Line Guideline.
Suggested for all commercial applications.
4. Snow Stand
Coated wire rack which supports unit 18 in. (457.2 mm) above
mounting pad to allow for drainage from unit base.
Usage Guideline:
Suggested in the following applications:
Heat pump installations in heavy snowfall areas.
Heat pump installations in snow drift locations.
Heat pump installations in areas of prolonged
subfreezing temperatures.
All commercial installations.
5. Thermostatic Expansion Valve (TXV) Bi--Flow
A modulating flow--control valve which meters refrigerant liquid
flow rate into the evaporator in response to the superheat of the
refrigerant gas leaving the evaporator.
Usage Guideline:
Accessory required to meet AHRI rating and system
reliability, where indoor not equipped.
Required in all heat pump applications designed with
Puron refrigerant.
6. Electro--Magnetic Interference Kit
Usage Guideline:
May be required to address radio frequency interference
for equipment, such as HAM radios, operating between 6
and30mHz.
25VNA

Carrier 25VNA Specifications

General

Refrigerant	R-410A
Energy Star Certified	Yes
Stages	Variable
HSPF2	Up to 9.5
Compressor Type	Variable Speed
Cooling Capacity	2-5 tons
Heating Capacity	2-5 tons
Warranty	10-year parts limited warranty