Ruud ANL-AZ 13 SEER Series, Installation Instructions Manual

22

START-UP

Checking Refrigerant Charge

Charge for all systems should be checked against 

the Charging Chart inside the access panel cover� 

WARNING:

 The top of the scroll 

compressor shell is hot� Touching the compressor 

top may result in serious personal injury�

IMPORTANT:

 Use factory-approved 

charging method as outlined on the next page to 

ensure proper system charge�

NOTICE:

 The optimum refrigerant charge  

for any outdoor unit matched with a CFL/CFM/H*L  

indoor coil/air handler is affected by the 

application� Therefore, charging data has 

been developed to assist the field technician 

in optimizing the charge for all mounting 

configurations (UF – Upflow, DF – Downflow, 

LH – Left-Hand Discharge, and RH – Right-Hand 

Discharge)� Refer to the charging chart inside the 

access panel cover on the unit and choose the 

appropriate column for the specific application 

being installed or serviced� New installations 

utilizing either a CFL/CFM indoor coil installed on a 

gas furnace or an H*L air handler in the downflow 

or horizontal right-hand discharge may require 

removal of refrigerant since the factory charge 

could result in an overcharge condition�

Charging Units With R-410A 

Refrigerant

CAUTION:

 R-410A pressures are 

approximately 60% higher (1�6 times) than R-22 

pressures� Use appropriate care when using this 

refrigerant� Failure to exercise care may result in 

equipment damage or personal injury�
Charge for all systems should be checked against 

the Charging Chart inside the access panel cover�

IMPORTANT:

 Do not operate the 

compressor without charge in the system�
Addition of R-410A will raise high-side pressures 

(liquid and discharge)�

NOTICE:

 System maintenance is to be 

performed by a qualified and certified technician�
The following method is used for charging systems 

in the cooling and heating mode� All steps listed 

should be performed to ensure proper charge has 

been set� For measuring pressures, the service 

valve port on the liquid valve (small valve) and 

the service port on the suction line between the 

reversing valve and compressor are to be used�

Confirm ID Airflow and Coils 

Are Clean

Confirm adequate indoor supply airflow prior to 

starting the system� See the Technical Specification 

Sheet for rated airflow for each ID/OD unit match� 

Air filter(s) and coils (indoor and outdoor) are to be 

clean and free of frost prior to starting the system� 

Supply airflow must be between 375 and 450 cfm 

per rated cooling ton prior to adjusting system 

charge� If a humidification system is installed, 

disengage it from operation prior to charge 

adjustment� Refer to the “Checking Airflow” section 

of this manual for further instruction�

NOTICE:

 Verify system components 

are matched according to the outdoor unit 

Specification Sheet�

Measurement Device Setup

1� With an R-410A gauge set, attach the high-

pressure hose to the access fitting on the liquid 

line (small) service valve at the OD unit�

2� Attach the low-pressure hose to the common 

suction port connected to the common suction 

line between the reversing valve and compressor�

3. Attach a temperature probe within 6" [15.2 cm] 

outside of the unit on the copper liquid line 

(small line)� For more accurate measurements, 

clean the copper line prior to measurement and 

use a calibrated clamp-on temperature probe or 

an insulated surface thermocouple� 

Charging by Weight

NOTICE:

 Adjust the system charge by 

weight for the straight length of the refrigerant line set�
For a new installation, evacuation of inter-

connecting tubing and indoor coil is adequate; 

otherwise, evacuate the entire system� Use the 

factory charge shown in “Electrical and Physical 

Data” on page 5 of these instructions or on the 

unit data plate� Note that the charge value includes 

charge required for 15 ft. [4.6 m] of standard-size 

interconnecting liquid line without a filter drier� 
Calculate actual charge required with installed 

liquid line size and length using:
1/4" [6.4 mm] O.D. = .3 oz./ft. [8.5 g/.30 m]
5/16" [7.9 mm] O.D. = .4 oz./ft. [11.3 g/.30 m]
3/8" [9.5 mm] O.D. = .6 oz./ft. [17.0 g/.30 m]
1/2" [12.7 mm] O.D. = 1.2 oz./ft. [34.0 g/.30 m]
Add 6 oz� for field-installed filter drier�

Refrigerant