This system uses R-410A M00036-V00
IMPORTANT! Please Read Before Starting This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently. For safe installation and trouble-free operation, you must: • Carefully read this instruction booklet before beginning. • Follow each installation or repair step exactly as shown. • Observe all local, state, and national electric codes.
CONTENTS Safety considerations 1 Accessories 2 Installation recommendations (indoor unit) 3 Installation recommendations (outdoor unit) 4 Electrical installation 5 Wiring system diagram 6_7 Electrical connections for indoor and outdoor units 8 Refrigerant line connections 9 Refrigerant R410A: special precautions when installing unit 10 Tightening refrigerant piping connections 11 System evacuation 12 Additional charge 13 Gas leak check 14 Checking and testing operation 15 Techni
SAFETY CONSIDERATIONS This manual is a guide for properly installing the Williamson-Thermoflo Wall-mounted split air conditioner. Improper installation can result in unsafe and dangerous conditions that will void the factory warranty. Prior to installation, read these instructions and any instructions that are packaged with separate pieces of equipment that make up the system. Please read these instructions thoroughly and carefully before attempting installation or operation.
ACCESSORIES The following accessories are supplied with the air conditioner. • The quantities are indicated in parenthesi s. Accessories in the Indoor Unit Case Installation plate (1) Remote control (1) “AAA” batteries for remote control (2) Remote control holder (1) Owner’s manual (1) Installation manual (1) Service manual (1) Warranty (1) Interconnecting wiring and conduits from the outdoor unit to the indoor unit are not provided with the air conditioner.
INSTALLATION RECOMMENDATIONS (INDOOR UNIT) 1. Before fixing the installation plate to a wall, you must determine the position of the 2 3/4 in (70 mm) hole through which the conduit, piping and drain hose pass to connect the indoor unit to the outdoor unit. The piping and conduit can be connected from the: Rear, Right or Left side of indoor unit. INCORRECT CORRECT 2.
INSTALLATION RECOMMENDATIONS (OUTDOOR UNIT) Attach the outdoor unit with 4 anchor bolts and nuts (not supplied) positioned as per dimensions A, B. 9SRAO-HE 12SRAO-HE | 15SRAO-HE 18SRAO-HE 24SRAO-HE A (in) 21 3/8 25 24 3/8 23 B (in) 13 13 3/8 15 15 A 24 in minimum Air inlet B 9 in minimum 12 in minimum Air outlet 24 in minimum 16 in minimum Caution: The outdoor unit should not be exposed to strong winds or where it is very dusty.
ELECTRICAL INSTALLATION 1. The air conditioner shall be installed by a qualified technician in accordance with national and local electrical codes. 2. A disconnect switch shall be installed near the outdoor unit for easy disconnect of power to the air conditioner. 3. An electrical circuit dedicated to the air conditioner shall be used for the power supply to the air conditioner. 4. Interconnecting wiring and conduits from the outdoor unit to the indoor unit are not provided with the air conditioner. 5.
WIRING SYSTEM DIAGRAMS 9SRA-HE | 12SRA-HE | 15SRA-HE (115V - 60Hz) INDOOR UNIT DISPLAY AND RECEIVE BOARD 9 Terminal block of indoor unit 2 2 BN ACL 1 1 OR 3 2 PIPE SENSOR 2 TEMP SENSOR 5 CMU 3 2 5 STEP MOTOR INDOOR CONTROL BOARD INDOOR UNIT WIRING DIAGRAM L1 N 3 2 OUTDOOR UNIT 1 OUTDOOR UNIT Terminal block of outdoor unit Power supply, 1 phase, 60 Hz L1 N INDOOR UNIT 1 IN FAN Communication wire ACN COMPULSIVE SWITCHING ACL wire 3 BU 2 ACN wire FUSE 3.
WIRING SYSTEM DIAGRAMS 18SRA-HE | 24SRA-HE (208-230V - 60Hz) INDOOR UNIT DISPLAY AND RECEIVE BOARD 9 Terminal block of indoor unit 2 2 BN ACL 1 1 OR 3 2 PIPE SENSOR 2 TEMP SENSOR 5 CMU 3 2 5 STEP MOTOR INDOOR CONTROL BOARD INDOOR UNIT WIRING DIAGRAM L1 L2 3 2 OUTDOOR UNIT Power supply, 1 phase, 60 Hz INDOOR UNIT L2 CAPACITOR BN PROTECTOR WH RD R S C COMPRESSOR HIGH PRESSURE SWITCH 3 3 2 2 1 1 BU BU ACN NO COM LOW PRESSURE SWITCH BN 5 FUSE 3.
ELECTRICAL CONNECTIONS FOR INDOOR AND OUTDOOR UNITS INDOOR UNIT 1. The indoor unit is powered from the outdoor unit. A sufficient length of conduit and wiring shall be used from the outdoor unit to the indoor unit. 2. To access the terminal block inside the indoor unit, remove the screw on the cover plate. (See Fig. A.) 3. Connect the inter unit conductors to terminals marked 1,2,3, terminals from the outdoor unit. (See Fig.B.
REFRIGERATION LINE CONNECTIONS When connecting the refrigerant tubing - Keep all tubing runs as short as possible. - Use the flare method for connecting tubing. - Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before connecting them, then tighten the nut with a torque wrench for a leak-free connection. - Check carefully for leaks before starting the test run.
REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN INSTALLING UNIT Caution: The compressor POE oil for R-410A units is extremely susceptible to moisture absorption and could cause compressor failure. Do not leave system open to atmosphere any longer than necessary for installation. General Information Systems using R-410A refrigerant run at a pressure of approximately 1.6 times that of similar systems using R-22 and the energy efficiency is comparable. The R-410A refrigerant is a 50:50 mixture of R-32 and R-125.
TIGHTENING REFRIGERANT PIPING CONNECTIONS Caution: Remove the protection caps on the pipes and connect the assembly piping to each connector. First, tighten the nuts manually and then with a wrench by applying the tightening torque shown below.
SYSTEM EVACUATION Condensing unit liquid and suction valves are closed to contain the charge within the unit. The unit is shipped with the valve stems closed and caps installed. Do not open the valves until the system is evacuated. 1. Connect the vacuum pump with 250-micron capability to the services valves. 2. Evacuate the system to 250 microns or less using suction and liquid service valves. Using both valves is necessary for some compressors create a mechanical seal separating the sides of the system.
ADDITIONAL CHARGE AND DISTANCE Refrigerant suitable for a piping length of 20 ft (6 m) is charged in the outdoor unit at the factory. When the pipe is longer than 20 ft (6 m), additional charging is necessary. This operation can only be performed by a qualified refrigeration specialist. Additional amount must be added for each extra 3.3 ft (1 m), see the table below: Models 9SRA-HE 12SRA-HE | 15SRA-HE | 18SRA-HE 24SRA-HE Additional refrigerant 20 g (0.7 oz) 30 g (1.06 oz) 40 g (1.
GAS LEAK CHECK Check that no gas escapes from the connections by using a leak detector or soapy water. A and B are the liquid and suction valves of the outdoor unit. C and D are the extremities of the indoor unit flared connections.
CHECKING AND TESTING OPERATIONS Perform the operation test after completing the gas leak check of the flare nut connections and the electrical connections. 1. To begin the test, turn on the power. 2. Press the auxiliary control button in the indoor unit or use the remote control to start the unit. 3. Check that all air conditioner functions are operating normally. A protection feature prevents the air conditioner from being started immediately after the unit has been turned off.
TECHNICAL SPECIFICATIONS SPECIFICATIONS MODELS Performance ratings Nominal capacity S.E.E.
OUTLINE AND DIMENSIONS Models: 9SRA-HE | 12SRA-HE | 15SRA-HE | 18SRA-HE | 24SRA-HE C A Indoor unit B Outdoor unit D H G F E In A B C D E F G H I I 9SRA-HE 12SRA-HE 15SRA-HE 18SRA-HE 24SRA-HE 10 7/8 10 7/8 12 5/8 12 5/8 13 31 1/2 43 1/2 31 1/2 38 3/4 38 3/4 8 1/4 8 1/4 7 1/2 7 1/2 9 1/4 31 3/4 37 1/2 38 1/4 33 7/8 33 7/8 11 14 1/2 12 12 14 23 25 25 32 1/4 36 1/2 5/8 1 1/2 1 1/2 5/8 11 1/4 12 12 13 3/4 14 1/4 14 1/8 16 1/4 14 3/4 14 3/4 16 1/4 Installation & service manual _17
PARTS DIAGRAM (INDOOR UNIT) INSIDE UNIT 9SRAI-HE 12SRAI-HE 15SRAI-HE 18SRAI-HE 24SRAI-HE Installation & service manual _18
PARTS LIST (INSIDE UNIT) Inside unit - spare parts REF.
PARTS DIAGRAM (OUTDOOR UNIT) OUTSIDE UNIT 9SRAO-HE 12SRAO-HE 15SRAO-HE 18SRAO-HE 24SRAO-HE Installation & service manual _20
PARTS LIST (OUTSIDE UNIT) Outside unit - spare parts REF.
NOTE Installation & service manual
8201 W. Calumet Road, Milwaukee, WI 53223 USA www.williamson-thermoflo.
