Table of Contents
Advertisement
Accessory
Compressor Start Assist Capacitor and Relay
Crankcase Heater
Evaporator Freeze Thermostat
Hard Shutoff TXV
Isolation Relay
Liquid Line Solenoid Valve
Low- Ambient Pressure Switch
Support Feet
* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, refer to Residential Piping and Longline Guideline.
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 number NASA001LS, specifically designed for R- 410A
refrigerant heat pumps. LSV should be installed within 2 ft. (0.61
m) of outdoor unit with flow arrow pointing toward outdoor unit.
Follow the Installation Instructions included with accessory kit.
IMPORTANT: Flow arrow must point toward outdoor unit.
Make Piping Connections
WARNING
!
PERSONAL INJURY AND ENVIRONMENTAL
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.
Federal regulations require that you do not vent refrigerant
into the atmosphere. Recover refrigerant during system repair
or final unit disposal
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
If ANY refrigerant tubing is buried, provide a 6- in (152.4
mm). vertical rise at service valve. Refrigerant tubing lengths
up to 36- in (914.4 mm). may be buried without further special
consideration. Do not bury lines longer than 36 in (914.4 mm).
Outdoor units may be connected to indoor section using accessory
tubing package or field- supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 80 ft (24.4 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 accessory
requirements. Refer to Table 2 for field tubing diameters.
There are no buried- line applications greater than 36 in. (914.4
mm)
If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.
Table 1 – Accessory Usage
Required for Low Ambient
Cooling Applications
(Below 55° F / 12.8° C)
Yes
Yes (standard)
Yes
Yes
(standard w/factory approved
indoor unit)
Yes
No
Yes
Recommended
Outdoor Unit Connected to Factory Approved Indoor
Unit:
Outdoor unit contains the 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.
Service Valves
Service valves are closed and plugged from the factory. Outdoor
units are shipped with a refrigerant charge sealed in the unit. Leave
the service valves closed until all other refrigerant system work is
complete or the charge will be lost. Leave the plugs in place until
line set tubing is ready to be inserted.
Heat pumps require a piston metering device in the liquid service
valve for proper heating operation. Piston is shipped in the piston
body of the liquid service valve, temporarily held in place with a
plastic cap. Do not remove the plastic cap until line set tubing is
ready to be installed.
Refer to Fig. 4 and follow these steps for piston installation:
1. Remove plastic cap holding piston in piston body of liquid
2. Check that piston size (stamped on side of piston) matches
3. Find plastic bag taped to unit containing copper adapter
4. Install plastic washer in the seat inside piston body.
5. Fit brass nut onto adapter tube and install tube onto liquid
3
Required for Long Line
Applications*
Yes
Yes (standard)
No
Yes
(standard w/factory approved
indoor unit)
No
See Residential Piping
and Long Line Guideline
No
No
service valve.
with number listed on unit rating plate. Return piston to pis-
ton body of liquid service valve (either direction).
tube, brass nut, and plastic washer.
service valve. Tighten nut finger tight, then wrench addi-
tional ½ turn only [15- ft lbs (20.3 N- m)]. Over tightening
may damage the plastic washer and service valve's piston
body.
BRASS NUT
ADAPTER TUBE
PLASTIC WASHER
PISTON
PISTON BODY
LIQUID SERVICE VALVE
Fig. 4 - Liquid Service Valve with Heating Piston and
Adapter Tube
Required for Sea Coast
Applications
(within 2 miles/3.2 km)
No
No
No
Yes
(standard w/factory approved
indoor unit)
No
No
No
Recommended
A14235
Advertisement
Table of Contents
