Ruud ANL-AZ 13 SEER Series, Installation Instructions Manual

10

INSTALLATION

Replacement Units 

To prevent failure of a new unit, the existing line set 

must be correctly sized and cleaned or replaced� 

Care must be exercised that the expansion device 

is not plugged� For new and replacement units, a 

liquid line filter drier must be installed and refrigerant 

tubing must be properly sized� Test the oil for acid� If 

positive, a suction line filter drier is mandatory�

IMPORTANT:

 When replacing an 

R-22 unit with an R-410A unit, either replace 

the line set or ensure that the existing line set is 

thoroughly flushed of any old oil or debris� Flush 

kits are available through aftermarket HVAC stores 

such as Prostock�

Indoor Coil

CAUTION:

Only use evaporators 

approved for use on R-410A systems that are 

specifically matched with the outdoor unit per 

the manufacturer’s specification sheets� Use 

of existing R-22 evaporators can introduce 

mineral oil to the R-410A refrigerant, forming two 

different liquids and decreasing oil return to the 

compressor� This can result in compressor failure�

REFER TO INDOOR COIL MANUFACTURER’S 
INSTALLATION INSTRUCTIONS.

IMPORTANT:

 The manufacturer is not 

responsible for the performance and operation of 

a mismatched system or for a match listed with 

another manufacturer’s coil�

NOTICE:

 All (-)PRL units must be 

installed with a matched TXV indoor coil� Refer to 

manufacturer’s outdoor unit specification sheet for 

approved indoor coils�

The thermostatic expansion valve in the 

matching coil is specifically designed to operate 

with R-410A� 

DO NOT use an R-22 TXV or 

evaporator� The existing evaporator must 

be replaced with the factory-specified TXV 

evaporator specifically designed for R-410A�

Location

Do not install the indoor coil in the return duct 

system of a gas or oil furnace� Provide a service 

inlet to the coil for inspection and cleaning� Keep 

the coil pitched toward the drain connection�

CAUTION:

When coil is installed 

over a finished ceiling and/or living area, it is 

required that a secondary condensate pan be 

installed under entire unit� Failure to do so can 

result in property damage�

Interconnecting Tubing

All units are factory-charged with R-410A 

refrigerant to cover 15 feet of line set� Adjustment 

of charge may be necessary even if the application 

has exactly 15 feet of line due to other installation 

variables and conditions� All models are supplied 

with service valves� Keep tube ends sealed until 

connection is to be made to prevent system 

contamination� 

Vapor and Liquid Lines

Keep all lines sealed until connection is made�
Make connections at the indoor coil first�
Refer to line size information in the tables on page 

12 for correct size and multipliers to be used to 

determine capacity for various vapor line diameters 

and lengths of run� The losses due to the lines 

being exposed to outdoor conditions are not 

included�

The factory refrigeration charge in the outdoor 

unit is sufficient for the unit and 15 feet [4.6 m] 

of standard size interconnecting liquid and vapor 

lines without a filter drier� For different lengths, 

adjust the charge as indicated below�
1/4" ± .3 oz./foot [6.4 mm ± 8.5 g/.30 m]
5/16" ± .4 oz./foot [7.9 mm ± 11.3 g/.30 m]
3/8" ± .6 oz./foot [9.5 mm ± 17.0 g/.30 m]
1/2" ± 1.2 oz./foot [12.7 mm ± 34.0 g/.30 m]
Add 6 oz� for field-installed filter drier�

Maximum Length of Lines

The maximum length of interconnecting line is 

150 feet [45.7 m]. Always use the shortest length 

possible with a minimum number of bends� 

Additional compressor oil is not required for any 

length up to 150 feet [45.7 m].

NOTICE:

 Excessively long refrigerant 

lines cause loss of equipment capacity�

Tubing