Hoshizaki Hoshizaki America, Inc. Commercial Kitchen Equipment Model Refrigerated Prep Table with Raised Rail “A Superior Degree of Reliability” SERVICE MANUAL www.hoshizaki.
IMPORTANT Only qualified service technicians should install, service, and maintain the unit. No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the equipment in accordance with this manual may adversely affect safety, performance, component life, and warranty coverage. Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the unit.
IMPORTANT This manual should be read carefully before the unit is serviced or maintenance operations are performed. Only qualified service technicians should install, service, and maintain the unit. Read the warnings contained in this booklet carefully as they give important information regarding safety. Please retain this booklet for any further reference that may be necessary. CONTENTS Important Safety Information............................................................................................
III. Service Diagnosis............................................................................................................ 25 A. Alarm Signals............................................................................................................... 25 1. High Temperature Alarm (E1).................................................................................. 27 2. Low Temperature Alarm (E2).................................................................................. 28 3.
. Door/Drawer Gaskets............................................................................................. 59 6. Shelves (if applicable)............................................................................................. 59 7. Drawers (if applicable)............................................................................................. 59 B. Maintenance................................................................................................................. 60 1.
Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, or damage to the unit. WARNING Indicates a hazardous situation which could result in death or serious injury. CAUTION Indicates a situation which could result in damage to the unit. IMPORTANT Indicates important information about the use and care of the unit.
I. Specifications A. Nameplate Ratings Model HPR46A(-D) HPR72A HPR72A-D HPR100A(-D) AC Supply Voltage Design Pressure (PSIG) HI LO Amperes 7.6 See Unit Nameplate 13.6 TBD 115/60/1 450 Refrigerant 404A 28.5 oz. 250 36.1 oz. TBD B. Dimensions Interior Volume Cu. Ft. Rail Capacity QTY of 1/6 Sized Pans HPR46A(-D) (1 Section) 8.5 12 HPR72A(-D) (2 Section) 18.8 18 HPR100A(-D) (3 Section) 29.1 26 Model Model Exterior Height (HE) mm (in.) Worktop Height (HW) mm (in.
II. General Information A. Construction This Hoshizaki unit features a cartridge-type refrigeration system that can be removed (excluding the rail evaporator).
B. Sequence of Operation The steps in the sequence are as outlined below. 1. Startup When the power switch is in the "ON" position, the cabinet temperature is displayed and cabinet cooling begins. When the power switch is in the "ON" position and the rail cooling switch is moved to the "NORMAL" or "LOW" position, the rail temperature is displayed and rail cooling begins. The "NORMAL" rail switch position is designed for use when the rail cover is open.
(3) Both CTh and RTh reach 3.6°F (2°C) below setpoint CabFM and PH continue. RailFM continues when rail cooling switch is in the "NORMAL" position and per F9 setting when in the "LOW" position. For details, see "II.D.4.a) Switch Settings." Comp, ConFM, and CLLV de-energize. RLLV de‑energizes for 2 seconds. RLLV energizes, then remains energized during Comp off time. 4. Cool Down Restart a) Power Switch "ON," Rail Cooling Switch "OFF" CTh warms to setpoint, the CabFM, CLLV, and PH continue.
a) Cabinet Defrost: Power Switch "ON," Rail Cooling Switch "OFF" CLLV continues, CabFM, Comp, ConFM, and PH de-energize. DH energizes and warms DTh to 49°F (9.4°C) (or the 100-minute defrost termination timer expires or DTst warms to 120°F±5°F (49°C±3°C)). When DTh reaches 49°F (9.4°C), DH de‑energizes, CLLV continues and a 5 minute Comp delay timer starts. When the 5-minute Comp delay timer expires, CabFM and PH energize for 10 seconds.
From 4 above CLLV energized DH de-energized CabFM de-energized Comp de-energized ConFM de-energized PH de-energized CabFM and PH energize for 10 sec. CLLV energized Comp energized ConFM energized • 6 hour DT expires, then resets • 100-minute defrost termination timer starts To 2 above CabFM energized CLLV energized Comp energized ConFM energized PH energized DTh reaches 49°F (9.
CabFM energized CLLV energized PH energized RailFM energized RLLV energized Initial startup begins here 13 CabFM energized CLLV energized Comp energized ConFM energized PH energized RailFM energized RLLV de-energized CabFM energized Comp energized ConFM energized PH energized RailFM energized RLLV energized CLLV de-energized CabFM energized CLLV energized Comp energized ConFM energized PH energized RailFM energized RLLV energized CabFM energized Comp energized ConFM energized PH energized RailFM energ
Comp energized ConFM energized DH energized RailFM energized RLLV energized CabFM de-energized CLLV de-energized PH de-energized C off R on DH energized RailFM energized RLLV energized CabFM de-energized CLLV de-energized Comp de-energized ConFM de-energized PH de-energized C off R off DH energized RailFM energized RLLV energized CabFM de-energized CLLV de-energized Comp de-energized ConFM de-energized PH de-energized C on R off Comp energized ConFM energized RailFM energized RLLV energized CabFM d
D. Control Board • A Hoshizaki exclusive solid-state control board is employed in all Hoshizaki HPR46A(‑D), HPR72A(-D), and HPR100A(-D) units. • All models are pretested and factory set. CAUTION 1. The control board is fragile; handle very carefully. 2. The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit when handling or replacing the control board. 3.
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3. Features a) LED Display and Service Lock-Out This control board uses twin LED displays to show system details and diagnostic information. For control board voltage protection, a 3A 125V fuse is incorporated into the control board circuitry. A service jumper is also provided to protect against unwanted changes to the unit's settings. This service lock-out jumper is located on the K151 connector terminals 7 and 8. See "II.D.4. Controls and Adjustments.
4. Controls and Adjustments The cabinet and rail temperatures are updated every 30 seconds. The control board is supplied with a service jumper on the K151 connector. Only the temperature setpoint and the temperature scale ("F5") may be adjusted with this connector in place. To view or adjust other selections, see "II.D.5. Service Menu." a) Switch Settings Power Switch "OFF": Unit off (both cabinet and rail). Power Switch "ON": Cabinet temperature is displayed and cabinet cooling begins.
c) Temperature Setpoint The temperature setpoint is the temperature setting at which the compressor turns on. The factory default temperature setpoints are 37° (3°C) for the cabinet and 33°F (1°C) for the rail (see the chart below). The temperature differential for the compressor to turn off is 3.6°F (2°C) below the temperature setpoint. The temperatures are updated every 30 seconds. If necessary, adjust the temperature setpoint as outlined below.
f) Temperature Correction Factor In cases where there is a discrepancy between the actual cabinet or rail temperature and the displayed temperature, a temperature correction factor is used to correct the displayed temperature. WARNING This unit has been factory tested with the default settings listed. Avoid using this function except to confirm that the setting is correct. If set incorrectly, the display could show an acceptable temperature even though the temperature is out of the proper range.
5. Service Menu The service menu ("F0" to "F9") may be used to change settings, acquire diagnostic information, and to view alarm history. To access the "F0" through "F9" service menu selections, you must first disconnect the service jumper (excluding "F5" which is accessible with or without the service jumper in place). The service jumper is located behind the wire cover below the control box and connects the control board K151 connector terminals 7 and 8 (white) together.
b) Service Menu Chart Service Menu Item and Details F0 Defrost Interval • The cabinet uses a time initiated heated defrost. Setting Range Cabinet Rail 1 to 12 hours in N/A 1 hour increments. Factory Default Cabinet Rail 6 N/A • The change in the defrost interval setting will take effect immediately. The next defrost will take place after the newly set time interval has elapsed. F1 F2 • Initiating a manual defrost on the cabinet will restart the defrost timer.
6. Alarm Signals In the event of operation outside of normal parameters, the control board identifies the issue with an alarm signal. The alarm signal and temperature are displayed in 1-second intervals. For service corrections, see "III.A. Alarm Signals.
E. Thermistor Check Thermistors (semiconductors) are used for temperature control in the cabinet and rail areas, defrost termination, and for monitoring condenser temperature (clogged filter). The resistance varies depending on temperature. No adjustment is required. If necessary, check for resistance between thermistor leads and visually check the thermistor mounting. 1) Disconnect the connector for the thermistor in question under the control box and behind the wire guard. 2) Remove the thermistor.
III. Service Diagnosis WARNING 1. This unit should be disassembled or repaired only by a qualified service technician to reduce the risk of injury, electric shock, or fire. 2. Do not make any alterations to the unit. This could cause water leak, electric shock, or fire. 3. To help reduce the risk of electric shock, do not touch the attachment plug or switches with damp hands. 4. In case of insufficient refrigeration performance, move the stored food product into another unit to prevent its deterioration.
Alarm Priority Problem Signal High Condenser Temperature Alarm (clogged filter) E7 6 Reset, Corrections, and Adjustments Turn the power off, then back on. Condenser temperature is outside of normal operating temperature. 140°F (60°C) Defrost Thermistor Malfunction Alarm E8 E9 EA ED Condenser and/or air filter dirty. Fan motor not turning. Possible restriction in refrigeration system. Failure to take action when this alarm activates could result in damage to the compressor.
1. High Temperature Alarm (E1) If the cabinet or rail temperature exceeds the setpoint temperature by 18°F (10°C) or more for more than x hours, "E1" is displayed. The default value of x is "2" (2 hours). The value of x can be changed under "F3" on the service menu. (0=No delay; 1=1; 2=2; 3=3 hours) Note: • After the machine has been turned off and then turned back on, the high temperature alarm feature is not active until the area temperature reaches the lower setpoint temperature differential.
2. Low Temperature Alarm (E2) If the cabinet or rail temperature drops below the setpoint temperature by 9°F (5°C) or more for more than y hours, "E2" is displayed. The default value of y is "1" (1 hour). The value of y can be changed under "F4" on the service menu. (0=No delay; 1=1 hour) Note: • The low temperature alarm timer starts once the cabinet temperature drops 9°F (5°C) below the setpoint temperature. • The low temperature alarm feature operates even during defrost.
3. Cabinet Defrost Alarm (E3) Once the defrost termination temperature is reached, the signal from the defrost thermistor should terminate the defrost. If the defrost thermistor does not terminate the defrost within 100 minutes (1 hour and 40 minutes), "E3" is displayed. When "E3" is displayed, the next step in the defrost process begins. Reset Options To reset the alarm, turn the power off and then back on. Possible Causes (for further details see "III.B. Service Chart") • Trouble with the defrost heater.
4. High Condenser Temperature Alarm (clogged filter) (E7) The unit is equipped with a condenser air filter to protect the condenser from dirt, grease, etc. The condenser air filter promotes clean condenser surfaces and efficient operation and should be checked twice monthly and cleaned when necessary. The unit is also equipped with a condenser thermistor to determine if the condenser or condenser air filter is excessively dirty.
5. Defrost Thermistor (cabinet) Malfunction Alarm (E8) If the control board detects an open defrost thermistor, "E8" is displayed. When the control board detects a shorted defrost thermistor, a 10-minute delay timer begins. After the 10‑minute delay timer expires, "E8" is displayed. To bypass the 10-minute delay timer, move the power switch to the "OFF" position. Then, while pressing the rail "SET" button, move the power switch to the "ON" position.
6. Condenser Thermistor Malfunction Alarm (E9) If the control board detects an open condenser thermistor, "E9" is displayed. When the control board detects a shorted condenser thermistor, a 10-minute delay timer begins. After the 10‑minute delay timer expires, "E9" is displayed. To bypass the 10-minute delay timer, move the power switch to the "OFF" position. Then, while pressing the rail "SET" button, move the power switch to the "ON" position.
7. Control Board Alarms (EA and ED) "EA" is displayed when an EEPROM write error is detected. "ED" is displayed when an EEPROM verification or read error is detected. Reset Options Replacing the control board with a functioning control board will eliminate this alarm condition. B. Service Chart 1. No Operation Problem [1] The unit will not start. Possible Cause a) Power Supply b) Cord and Plug c) Control Switch d) Transformer [2] Cabinet, rail, or condenser fan will not start. 1. Open coil winding.
Problem [3] Compressor will not start or stops operating. (continued) Possible Cause f) Voltage g) High Pressure Switch g) High Pressure Switch (continued) h) Thermistors (cabinet and rail) i) Compressor Overload j) Compressor k) Control Board 1. Too low. 2. Too high. 1. Restricted air flow to condenser. 2. Condenser air filter and/or condenser clogged. 3. Bad contacts. Remedy 1. Call electrician. 2. Call electrician. 1. Move unit or increase ventilation. 2. Clean. 3. Check continuity and replace. 4.
Problem [1] Cabinet temperature too high. (continued) Possible Cause g) Defrost Remedy 1. See "4. Cabinet Defrost." h) i) j) 2. See "4. Cabinet Defrost." 1. Clean. 1. Check and replace. 1. Check and replace. k) l) 1. Defrost time insufficient to remove frost. Operation in humid conditions. 2. Incomplete defrost. Air Filter or Condenser 1. Clogged, dirty. Cabinet Fan Motor 1. Defective. Cabinet Liquid Line 1. Does not open. Valve Service Valve(s) 1. Partially or completely closed. Refrigerant 1. Leak.
3. Rail Cooling Problem Possible Cause [1] Rail temperature too a) Warm Food high. Remedy 1. Pre-cool food or allow time for unit to return to setpoint temperature. b) Rail Pans/Dividers 1. Missing, not in place. 1. Replace. Pans must cover entire rail for proper cooling. c) Outside Heat Source 1. Too close to unit. 1. Separate unit from heat source. d) Rail Switch 1. "OFF" position. 1. Move to "NORMAL" or "LOW" position. 2. Bad contacts. 2. Check for continuity and replace. e) Rail Thermistor 1.
4. Cabinet Defrost Problem [1] Cabinet fan motors on. [2] Evaporator does not defrost completely. Possible Cause a) Cabinet Fan Relay b) Control Board a) Defrost Thermistor b) Defrost c) Defrost Heater d) Defrost Thermostat [3] Defrost cycle too long. (E3 Defrost Alarm) e) Cabinet Liquid Line Valve a) Defrost b) Defrost Thermistor c) Defrost Heater d) Defrost Thermostat e) Control Board Remedy 1. Bad contacts (closed). 1. Check for continuity and replace. 1. Defective. 1. Replace. 1. Defective. 1.
5. Other Problem [1] Condensate water overflow. Possible Cause a) Cabinet Contents b) Location of Unit c) Seals d) Environment e) Rail Condensate Pan [2] Abnormal Noise a) Fasteners b) Compressor c) Fan d) Relay e) Liquid Line Valve Solenoid 1. Loading large volumes of warm, moist, uncovered product. 1. Unit located near high humidity source such as fryer, steamer, etc. 1. Poor sealing around evaporator, door/ drawer gaskets. 1. Extreme environment and door-opening conditions. 1. Overflowing.
IV. Removal and Replacement of Components WARNING 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Move the power switch to the "OFF" position and unplug the unit before servicing. 3. Make sure all food zones are clean after the unit is serviced. For cleaning procedures, see "V. Cleaning and Maintenance Instructions." A. Service for Refrigerant Lines WARNING 1.
2. Brazing WARNING 1. R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). 2. R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), these refrigerants can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous. 3. Do not use silver alloy or copper alloy containing arsenic. 4. Use an electronic leak detector or soap bubbles to check for leaks.
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends on pump capacity. 4) Close both gauge manifold valves. 5) Turn off the vacuum pump. Disconnect the vacuum pump hose and attach it to a refrigerant service cylinder. Remember to loosen the connection, and purge the air from the hose. See the nameplate for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No. 700 (latest edition) be used.
B. Removal and Replacement of Refrigeration System Cartridge CAUTION The refrigeration system cartridge should not be removed until the refrigerant has been properly recovered or the refrigeration system has been properly pumped down. For refrigeration system repairs, the refrigerant recovery procedure must be used. See "IV.B.1. Refrigerant Recovery Procedure." For non‑refrigeration system repairs, see "IV.B.2. Pump‑Down Procedure." Do not discharge the refrigerant into the atmosphere. 1.
13) Slide the refrigeration cartridge forward. Support the evaporator as it clears the evaporator case. See Fig. 2. CAUTION 1. Be careful when handling the cabinet evaporator assembly. This assembly includes a defrost heater sheathed in a glass tube. This sheathing can be easily damaged and may also cause cuts if broken. The defrost heater will also be hot after a defrost. Use gloves when handling and avoid touching the glass directly. Also prevent the defrost heater from touching other parts. 2.
2. Refrigeration System Pump‑Down Procedure 1) Remove the front panel. Move the power switch to the "OFF" position, then unplug the unit. 2) Remove the left side panel. 3) Connect the gauge manifold hoses to the receiver service valve (high-side) and the rail low-side access valve. See Fig. 1. Note: Be sure the high-side gauge manifold hose is on the receiver service valve before opening the receiver service valve. 4) Run in the receiver service valve stem all the way until tight.
16) Once the repair is made, replace the refrigeration cartridge back into its correct position. Support the cabinet evaporator as it enters the cabinet evaporator case. 17) Reconnect the rail side refrigerant tubes. Use a backup wrench and tighten the fittings 1/6 turn beyond fully seated. Use a backup wrench when tightening the fittings. 18) Secure the rail service valve bracket back in its correct position. 19) Secure the refrigeration cartridge with the attachment nuts, washers, and the hex head bolt.
Defrost Thermostat Refrigeration Cartridge Rail Thermistor Cabinet Thermistor Defrost Heater Evaporator Case Fan Motor Shroud Cabinet Evaporator Cabinet Fan Motors Defrost Thermistor Fig.
C. Removal and Replacement of Compressor CAUTION 1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow. 3. When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C). 4. Recover the refrigerant when replacing the compressor.
15) Replace the panels in their correct positions. 16) Plug in the unit, then move the power switch to the "ON" position to start the unit's cooling process. D. Removal and Replacement of Cabinet Evaporator CAUTION 1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow. 3.
8) Braze the fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 9) Replace the removed evaporator parts in their correct positions. 10) Once the repair is complete, return to step 15 in "IV.B.1. Recovery Procedure" for refrigeration system cartridge replacement. E. Removal and Replacement of Expansion Valve Moisture in the refrigeration circuit may exceed drier capacity and freeze up at the expansion valve. CAUTION 1.
F. Removal and Replacement of Liquid Line Valve CAUTION 1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow. 3. When brazing, protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating. Do not allow the valve body or drier to exceed 250°F (121°C).
G. Removal and Replacement of Condenser CAUTION 1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow. 3. When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).
H. Removal and Replacement of Thermistors and Thermostat CAUTION 1. The thermistors are fragile; handle very carefully. 2. Do not shorten or cut the thermistor leads. 1. Cabinet Thermistor 1) Remove the refrigeration system cartridge. Perform steps 1 through 16 in "IV.B.2. Pump-Down Procedure." Once the refrigeration system cartridge is out, proceed to step 2. 2) Cut the cable tie holding the cabinet thermistor to the cabinet thermistor bracket. Remove the thermistor. See Fig. 5.
3. Defrost Thermostat 1) Remove the refrigeration system cartridge. Perform steps 1 through 16 in "IV.B.2. Pump-Down Procedure." Once the refrigeration system cartridge is out, proceed to step 2. 2) Disconnect the defrost thermostat wires, then remove the defrost thermostat. See Fig. 5. 3) Install the new defrost thermostat and connect the thermostat wires. 4) Once the repair is complete, return to step 17 in "IV.B.2. Pump-Down Procedure" for refrigeration system cartridge replacement. 4.
5. Condenser Thermistor (clogged filter) 1) Remove the front panel. Move the power switch to the "OFF" position, then unplug the unit. 2) Remove the left side panel. 3) Remove the aluminum tape and cut the cable tie securing the thermistor. See Fig. 7. 4) Remove the thermistor. Disconnect the wire connection (below the control box). 5) Install the new thermistor and secure with a cable tie and aluminum tape.
J. Removal and Replacement of Fan Motors 1. Cabinet Fan Motor CAUTION Be careful when handling the evaporator shroud assembly. This assembly includes a defrost heater sheathed in a glass tube. This sheathing can be easily damaged and may also cause cuts if broken. Heater will also be hot after a defrost. Use gloves when handling and avoid touching the glass directly. Also prevent heaters from touching other parts. 1) Remove the refrigeration system cartridge. Perform steps 1 through 16 in "IV.B.2.
2. Condenser Fan Motor 1) Open the front panel. Move the power switch to the "OFF" position, then unplug the unit. 2) Remove the left side panel. 3) Disconnect the fan motor wires. 4) Remove the condenser fan motor assembly bolts, then remove the condenser fan motor assembly. See Fig. 10. 5) Remove the fan motor from the fan motor bracket and remove the fan blade from the fan motor. 6) Place the fan blade on the new fan motor, then install the new fan motor.
7) Remove the rail access hole sealant and grommet. 8) Push the old fan motor wires (with new fan motor wires securely attached) into the rail channel. Once the new fan motor wires are in the channel, replace the access hole grommet. Remove the left side panel, then pull the fan motor wires through the rail channel. 9) Disconnect and discard the old fan motor wires. Connect the new fan motor wires. 10) Seal the rail access hole with food grade silicone.
V. Cleaning and Maintenance Instructions A. Cleaning WARNING 1. Before cleaning the unit, move the power switch to the "OFF" position and unplug the unit to prevent electric shock by unexpected entrance of water into the unit or injury by moving parts. 2. Before cleaning the unit, move all foods into another clean refrigerator or freezer. 3. Do not splash water directly onto the unit. This might cause short circuit, electric shock, corrosion, or failure. 4. Do not pour or spray water into the rail area.
2. Rail and Rail Cover Spills and splashes should be wiped up promptly to avoid unpleasant odors. Wipe the interior of the rail and the rail cover regularly with a clean, damp sponge or cloth containing a neutral cleaner. Do not pour or spray water into the rail area. WARNING 1. Be sure to support the rail cover when cleaning. Otherwise, the rail cover could close suddenly and cause injury. 2. Metal edges can cause cuts. Use care and wear protective gloves when cleaning. 3.
B. Maintenance 1. Rail Condensate Pan The rail condensate pan collects condensate water from the rail. Empty the pan as often as necessary depending on conditions. Clean the pan at least once a month with a clean, damp sponge or cloth containing a neutral cleaner. 2. Air Filter The plastic mesh air filter (located behind the front panel) removes dirt and dust from the air, and keeps the condenser from getting clogged. As the filter gets clogged, the unit's performance will be reduced.
C. Shutdown and Long Storage WARNING 1. When preparing the unit for long storage, prevent the doors/drawers from closing to reduce the risk of children getting trapped. 2. To reduce the risk of electric shock, do not touch the attachment plug or switches with damp hands. 3. To unplug the unit, be sure to pull the attachment plug and do not jerk the power cord. It could be damaged and cause fire or electric shock. 4.
Rail Evaporator Rail Fans Receiver Tank Condenser Fan Rail Expansion Valve Rail Liquid Line Valve Rail High-Side Access Valve Rail High‑Side Service Valve Drier Compressor Compressor Access Valve Receiver Service Valve Cabinet Expansion Valve Cabinet Liquid Line Valve Rail Low-Side Access Valve Rail Disconnects Rail Low‑Side Service Valve Cabinet Evaporator Defrost Thermistor Control Box Note: The number of rail fans varies between models.
B. Wiring Diagrams 1.
2a.
2b.
3.
