PRODUCT. TWB Two-Way Air Defrost Unit Coolers PRODUCT DATA & INSTALLATION. High Temperature (35 o F / 1.7 o C or Higher) Applications

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1 DATA & INSTALLATION Bulletin RPDI KEEPRITE TWOWAY UNIT COOLER UNIT SERIES B = ND GENERATION BTUH o F TD (0Hz) e.g. 450 = 0 o F TD TYPE OF DEFROST A = AIR DEFROST (HIGH TEMP) ELECTRICAL DESIGNATION A = //0 W = 0830//0, 000//50 NOMENCLATURE TW B 450 A W TWB TwoWay Air Defrost Unit Coolers High Temperature (35 o F /.7 o C or Higher) Applications Electrical Power: //0, 0830//0, 000//50 * NSF approved flush to ceiling mount. * Cleanable, durable textured aluminum cabinet. * Thermally protected fan motor for long life and dependability. * Compact size maximizes usable storage space. * Dual refrigeration coils and twoway air distribution reduces air velocities to minimize product dehydration. Air enters through fan and discharges two ways out of each coil side. * Single fan models include 3 motor power cord. CONTENTS Nomenclature... Capacity Data... Electrical/Physical Data... Wiring Diagram... Dimensional Data... TXV Selections... Inspection... Application... Installation... Location... Drain Line... Piping... Wiring... System Check... Maintenance... Service Parts List... Service Log... PAGE Cover 3 3,4 5 7 Back

2 0Hz Capacity Data BTUH * R at +0 o F S.S.T. with coil 30% full 0 HZ Fan Motor Electrical Data MODEL TWB87A TWBA TWBA TWB03A TWB50A TWB300A TWB450A TWB00A TWB900A TWB00A FAN MOTOR QUANTITY (/5 HP ea) Hz Capacity Data BTUH 50 HZ Fan Motor Electrical Data 0Hz SPECIFICATIONS MODEL NUMBER TWB o F TD o F TD o F TD CFM REFRIG. LBS CHARGE*: KG UNIT WEIGHT: LBS KG TOTAL FLA //0 0830//0 MIN. CIRC. MAX. FUSE MIN. CIRC. TOTAL FLA AMPACITY (AMPS) AMPACITY Hz SPECIFICATIONS o F TD o F TD o F TD CFM REFRIG. LBS CHARGE*: KG UNIT LBS WEIGHT: KG * R at +0 o F S.S.T. with coil 30% full MODEL TWB87A TWBA TWBA TWB03A TWB50A TWB300A TWB450A TWB00A TWB900A TWB00A FAN MOTOR QUANTITY (/5 HP ea) 3 4 MODEL NUMBER TWB TOTAL FLA //50 MIN. CIRC. AMPACITY MAX. FUSE (AMPS) MAX. FUSE (AMPS)

3 3 (7 mm) (5 mm) 3/8 OD SUCTION WIRING DIAGRAM NOTE: Wiring diagram applicable to multiple fan models. Single fan models use 3 powercord(bare wire terminations) connected directly within motor. DIMENSIONAL DATA SINGLE FAN MODELS / FLARE NUT LIQUID / OD DRAIN 3 (94 mm) FAN MOTOR POWER CORD 4 MTG. HOLES 7/3 ( mm) DIA. 9/ 4mm) /4 (3mm) MODEL TWB87A TWBA TWBA TWB03A TWB50A TWB300A DIMENSIONAL DATA INCHES (MM) A B C D E 8 7/8 4 / 4 3/4 7 3/4 9 3/4 (479) (4) (375) (45) (48) 8 7/8 4 / 4 3/4 7 3/4 9 3/4 (479) (4) (375) (45) (48) 8 7/8 5 / 4 3/4 7 3/4 9 3/4 (479) (40) (375 (45) (48) 8 7/8 5 / 4 3/4 7 3/4 9 3/4 (479) (40) (375 (45) (48) 7/8 5 / 9 3/4 0 3/4 4 3/4 (555) (40) (50) (57) (375) 7/8 5 / 9 3/4 0 3/4 4 3/4 (555) (40) (50) (57) (375) 3 (94 mm) POWER CORD 9/ (4 mm) dia. knockouts each side 7/8 DIA. KNOCKOUTS EACH SIDE DRAIN / OD ALUMINUM 3

4 DIMENSIONAL DATA MULTIPLE FAN MODELS 4

5 TXV (Expansion Valve) Selections TXV SELECTION All Units require the use of a TX valve. These can be mounted within the cabinet at the flare connection (single fan models) or refrigerant distributor stub (two to four fan models). Single fan models use an internally equalized valve. Two through four fan models require an externally equalized valve (external equalizer tube connection is provided for ease of installation). Two, Three and Four Fan Models use a distributor with a fixed orifice size (nozzles do NOT require to be field selected or installed). ALCO TXV SELECTIONS 35 o F AND UP ROOMS TWB 0 o F TD o F TD UNIT MODEL BTUH R34a R R404A/R50 BTUH R34a R R404A/R HF /8 RC HF /4 MC HF /4 MC HF /8 RC HF /4 HC HF /4 HC HF /4 RC HF / MC HF / MC HF /4 RC HF / HC HF 3/4 MC HF / RC HFES / MC 750 HFES / RC HFES / HC HFES / RC HFES 3/4 MC HFES HC HFES RC HFES 3/4 MC HFES HC HFES RC 3500 HFES MC HFES / HC HFES /4 RC 0 00 HFES MC HFES / HC HFES /4 RC 750 HFES / MC HFES HC HFES / RC NOTE: Above selections are based on 00 o F entering liquid temperatures. Where available use the HFESC series valve (in place of HFES) which includes sweat fittings with a removable/cleanable inlet screen. SPORLAN TXV SELECTIONS 35 o F AND UP ROOMS TWB 0 o F TD 0 o F TD o F TD UNIT MODEL BTUH R/R34a* R R404A*/R50 BTUH R/R34a* R R404A*/R GJ /8 C 0 GS /8 C GJ /8 C 0 GS /8 C 890 GV /5 C 490 GV /5 C GJ /4 C GS /4 C GJ /4 C GS /4 C 4500 GV /3 C GJ / C EGVE / C 750 EGJE / C EGVE 3/4 C EGSE / C EGJE / C EGSE / C EGVE 3/4 C 9000 EGJE C EGVE C EGSE C EGJE C EGVE C EGSE C EGVE / C 8000 EGJE / C EGSE / C * Valve part numbers are coded for R34a (may be used on R) and R404A (also may be used on R50) NOTE: Above selections are based on 00 o F entering liquid temperatures. 5

6 INSPECTION Careful inspection of all parts when received for loss or damage in transit is very important Remember, you, the consignee, must make any claim necessary against the transportation company. Shipping damage or missing parts, when discovered at the outset, will prevent later unnecessary and costly delays. Electrical characteristics should also be checked at this time to ensure that they are as ordered. APPLICATION TwoWay Unit Coolers are designed for use in +35 o F (.7 o C) and up temperature applications such as reach in boxes, display cases, back bars, walkin rooms and any other cooler applications where a low velocity, uniform air flow is required. The compact and low height unit provides maximum useable product storage space. At room temperatures above 34 o F (. o C) and evaporating temperatures no lower than 7 o F (.8 o C) the air flowing through the coil will accomplish the defrost. INSTALLATION The installation and start up of Unit Coolers should only be performed by qualified refrigeration mechanics. This equipment should be installed in accordance with all applicable codes, ordinances, and local bylaws. LOCATION The Unit Cooler is designed to be mounted to the ceiling of the box or cabinet. Refrigeration piping and electrical connections are routed to the rear sides (through the knockouts). The unit must be mounted to a level ceiling to ensure complete drainage from the condensate pan to the drain fitting. Refer to the dimensional drawings for the drain fitting and mounting location details. DRAIN LINE The drain line should be run from the drain connection, sloping at least 4 per foot (approx.30%). A trap outside the room will prevent warm air INSTALLATION INSTRUCTIONS from entering through the tubing. Connection should be made to proper drainage facilities that comply with local regulations. PIPING Refrigerant line sizes are important and are not necessarily the same size as the connections at the condensing unit or evaporator. If in doubt refer to a recognized source. (Manufacturer s Engineering Manual, Ashrae Manuals, etc.) WIRING Wire system in accordance with governing standards and local codes. A 3 (4 mm) power cord has been provided for ease of installation (on single fan units only). Ensure all connections are tight and secure. Multiple fan units have a junction terminal box for conduit connections. SYSTEM CHECK Before Start Up:. Ensure wiring is in accordance with codes.. Refrigerant lines are properly sized and routed. 3. Thorough leak check, evacuation and dehydration has been performed. 4. Drain line has been checked for free flow. After Start Up:. Fan has been checked for correct air flow and no obstructions.. Expansion valve superheat has been checked for proper operation. (Superheat of the coil should be around 5 to o F for a 0 o F TD.) MAINTENANCE The unit should be periodically inspected for any dirt or build up on the fin surface and cleaned if necessary with a soft whisk or brush. The fan motor is permanently lubricated and should not require service.

7 SERVICE PARTS LIST 7 MODEL TWB FAN MOTORS MOTOR MOUNT FAN BLADE FAN GUARD TERMINAL BOARD //0 0830//0 000//

8 System Model Number Serial Number Refrigerant Electrical Supply DATE SERVICE LOG PROJECT INFORMATION NATIONAL REFRIGERATION & AIR CONDITIONING S INC. 9 ROY BLVD., BRANTFORD, ONTARIO, CANADA N3T 5Y PHONE: (59) FAX (59)75340 Specifications Subject to Change Without Notice Date of StartUp Service Contractor Phone Fax COMMENTS