HTPG2303IOMPRS Packaged Refrigeration System (PRS) Installation Guide

HTPG2303IOMPRS Packaged Refrigeration System (PRS) Installation Guide

Packaged Refrigeration System (PRS)

INSPECTION

Check all items against the bill of landing to make sure all crates or cartons have been received. If there is any damage, report it immediately to the carrier and file a claim. Make sure the voltage on the unit nameplate agrees with the power supply available.

GENERAL SAFETY INFORMATION

1. Installation and maintenance are to be performed only by qualified personnel who are familiar with this type of equipment.
2. Make sure that all field wiring conforms to the requirements of the equipment and all applicable national and local codes.
3. Avoid contact with sharp edges and coil surfaces. They are potential injury hazards.
4. All power sources must be disconnected prior to any servicing or maintenance of this unit. After disconnecting power, allow 5 minutes for capacitor discharge before servicing motors.
5. Refrigerant recovery devices must be used during installation and service of this equipment. It is illegal for ALL refrigerants to be released into the atmosphere.

UNIT PLACEMENT REQUIREMENTS

See dimensions and weight tables on pages 9-11 and follow these guidelines:

1. Make sure that the structural integrity of the box can withstand the weight of the unit(s).
2. Do not remove the shipping skid from the unit until it is ready to be lifted into place on top of the walk-in.
3. Do not locate the evaporator section of the unit over a door.
4. The unit supply air pattern must cover the entire walk-in.
5. Leave one unit width between sides of unit and walls. Leave two-unit widths between units.
6. Provide adequate space at the compressor compartment end of the unit and a minimum of two feet above the unit for servicing.
7. Adequate airflow must be available for condenser. Do not shield the PRS unit, use top of walk-in for storage, or install the PRS unit in a non-ventilated space. Lack of attention to this detail will cause poor performance and possibly unit failure.
8. Do not locate unit around steam, hot air or fume exhausts.
9. Indoor units are designed for use in areas that range in temperature from 50°F to 110°F.
10. Outdoor installation requires a Roof Kit or condensate drain heater. Roof Kit sold separately.
11. Do not install units in noise sensitive areas. Units must be properly supported to prevent excessive noise and vibration.
12. Installations that do not conform to all the requirements in this manual will void the unit warranty.

INSTALLATION INSTRUCTIONS OUTDOOR MODELS

GENERAL
Installation and maintenance are to be performed by qualified personnel who are familiar with local codes and regulations. Installers should have previous experience with commercial refrigeration equipment

CAUTION: AVOID CONTACT WITH SHARP EDGES AND COIL SURFACES. THEY ARE POTENTIAL HAZARDS.

The PRS cabinet units have lifting eyes. Use a spreader bar when rigging to prevent damage and to reduce stress on the unit cabinet.

IMPORTANT: The compressor compartment cover must be left on units when lifting using the lifting eyes.

Installation is the same as indoor models except as follows:

1. Units must be curb mounted (curb provided by others). To help with curb sizing, see pages 8-9 which show unit footprint dimensions for each cabinet size. Curb height should be limited to 6 inches. The curb should be insulated and divide supply and return air flows.
2. Make sure curb is level and properly flashed to prevent water leakage into walk-in.
3. Water from rain or snow may get into compressor section of unit. Make sure the curb under this part of unit is designed with openings so water will not collect inside the curbing.
4. The condensate drain outlet is located on the side of the unit. Field piping may be connected to the outlet provided it is adequately sloped and heated to prevent freezing, where necessary. The drain line in the unit is trapped.
5. Secure unit to curb using the base mounting rail.
6. Install weather hood and optional condenser hail guard.

NOTE: Roof membrane (supplied by others) must be cut to allow for evaporator air flow from the unit into the cooled environment (box).

INSTALLATION & CLEARANCES OUTDOOR MODELS

NOTE: Units are ONLY designed for top mount applications

CLEARANCES & UNIT PLACEMENTS LARGE CABINET DIMENSIONS

CLEARANCES & UNIT PLACEMENTSSMALL CABINET DIMENSIONS

BEFORE UNIT START-UP

1. Check all mechanical and electrical connections for looseness that may have developed during transit and tighten as necessary.

2. Adhere to all applicable building and electrical codes when wiring unit.

3. Make sure supply power is correct voltage and phase for unit and is fused properly.

4. If unit is supplied with a power cord, plug unit into power supply
   IMPORTANT

   • Do not use extension cords to connect unit to power!
   • Plug-in to grounded three prong outlet!
   • Do not remove grounding prong!
   • Do not use a power adapter!

5. If unit is not offered with a cord, hard wire to power suitable supply.

AFTER UNIT START-UP

1. To protect the compressor (in the event of a brief power interruption), the electronic controller is programmed for a five-minute start-up time delay.
2. See EcoNet Controller Operation section to set box temperature (factory settings are 35ºF for air defrost coolers, and -10ºF for freezers) and change any control parameters that may have to be adjusted to fit the application.
3. Unit defrosting operation should be checked after start-up and periodically thereafter. The amount and pattern of frosting can vary greatly. Frost build-up is dependent on the temperature of the room, the type of product being stored, and usage profile.

PRS WEIGHT

**Model| Cabinet Size| APX. NET WEIGHT| APX. SHIP WEIGHT
---|---|---|---
LB| KG| LB| KG
HPH050M48AA| Small| 206| 93.4| 286| 129.7
---|---|---|---|---|---
HPH055M48AA| Small| 206| 93.4| 286| 129.7
HPO080M48AA| Small| 206| 93.4| 286| 129.7
HPO100M48AA| Small| 206| 93.4| 286| 129.7
HPO120M48AA| Large| 235| 106.6| 313| 142
HPH050M48DA| Small| 206| 93.4| 286| 129.7
HPH055M48DA| Small| 206| 93.4| 286| 129.7
HPO080M48DA| Small| 206| 93.4| 286| 129.7
HPO100M48DA| Small| 206| 93.4| 286| 129.7
HPO120M48DA| Large| 235| 106.6| 313| 142
HPO150M48DA| Large| 235| 106.6| 313| 142
HPO150L48DA| Small| 218.5| 99.1| 298.5| 135.4
HPO250L48DA| Small| 218.5| 99.1| 298.5| 135.4
HPO300L48DA| Large| 264| 119.7| 342| 155.1
HPO350L48DA| Large**| 264| 119.7| 342| 155.1

ACCESSORY WEIGHT

MAINTENANCE

The following items should be checked every six months. Make sure all power is shut off to unit before performing any maintenance or service

1. Tighten all electrical connections.

2. Check all wiring and insulators.

3. Check contactor for proper operation.

4. Check all fan motors. Tighten motor mount screws/nuts and fan set screws.

5. Clean the condenser and evaporator coil surfaces.
   CAUTION: Avoid contact with sharp edges and coil surfaces. They are potential hazards.

6. Check the operation of the control system. Make sure all safety controls are operating properly.

7. Make sure evaporator is defrosting properly.

8. Clean the drain pan and drain lines. Check the drain pan and drain line for proper drainage.

9. On outdoor units make sure the crankcase and drain line heaters, and thermostat are functioning properly.

10. On low temperature units make sure drain line heater is operating properly

SERVICE

All service to the evaporator section is performed by removing the top panel. The PRS uses an EEV controlled by the EcoNet Controller. Drain pan and defrost heaters on electric defrost models are retained with clips and can be removed for service. The electrical compartment is accessed by the lift off hinged door. The compressor and condenser fans are serviced by removing the condenser section top panel. The PRS unit is factory charged with R448A.

SEQUENCE OF OPERATION

Set the rocker switch by the access panel to the ON position to power up the EcoNet controller

COOLING

On start-up, the controller will zero the Electronic Expansion Valve (EEV) and turn on Aux Relay 1 to start the evaporator fans.

After 1 minute, If the Space Temperature is greater than the Setpoint + Setpoint Control, the controller will begin a cooling cycle and the EEV will open. The controller will maintain an active cooling cycle for a minimum of 5 minutes by default (configurable via Settings→Equipment→Cmp. Min. Run Time).

With the EEV open, the Suction Pressure will begin to increase. When the Suction Pressure is greater than the Cut-Out Setpoint + Cut-In Offset, the controller will turn ON Aux Relay 2 to start the compressor and the condenser fans.

1. If the condensing pressure is below 120 PSIG, the fan speed control switch (FS) will close causing the condenser fans to operate at low speed.
2. If the condensing pressure rises above 180 PSIG the fan speed control switch (FS) will open causing the condenser fans to operate at high speed

Immediately after the compressor starts, the Suction Pressure will temporarily decrease as the controller starts metering the EEV to seek balanced system operation.

The evaporator fans (Aux Relay 1) will turn ON when Evap Temp 1 drops below 35ºF (Freezer) or 55ºF (Cooler).

When the EEV is open, the controller will ignore the low pressure Cut-Out Setpoint for the first 60 seconds of compressor (Aux Relay 2) operation. This bypass period is to prevent any possible unwanted low pressure cut-out during the initial decrease in Suction Pressure, and it is only applied on an active cooling cycle while the EEV is open.

After the bypass time has elapsed, if the Suction Pressure drops below the Cut-Out Setpoint, the Aux Relay 2 will turn OFF and stop the compressor. The controller is still in an active cooling cycle with the EEV open, which will cause the Suction Pressure to rise again and turn the compressor (Aux Relay 2) back ON and reset the 60 second bypass timer. When the Space Temp Setpoint is satisfied, the cooling cycle ends, and the controller will close the EEV causing a pump down. The compressor (Aux Relay 2) will turn OFF when the Suction Pressure drops below the Cut-Out Setpoint.

While the EEV is closed, if the Suction Pressure rises above Cut-Out Setpoint

• Cut-In Offset, the compressor (Aux Relay 2) will momentarily turn ON to keep the system pumped down, then immediately turn OFF when Suction Pressure falls below the Cut-Out Setpoint. There is no low pressure bypass timer when the EEV is closed.

DEFROST

FREEZER • Electric Defrost

Default defrost logic is based on cooling run time (default 6 hours; can be adjusted via Settings→Equipment→Def. Cmp. Run Time). Optional alternate defrost logic is Adaptive (Settings→Equipment→Defrost Type). See EcoNet Evaporator Controller Installation Manual for more information on Adaptive Defrost.

When the defrost cycle starts, the controller will close the EEV and wait 1 minute to allow the compressor to pump down before turning on the defrost heaters. (This pump down delay can be adjusted via Settings→Equipment→Def. Pmp. Dn. Delay.)

After this delay, the evaporator fans will turn OFF, and the defrost heaters will turn ON. While the controller is undergoing a defrost cycle (“Defrosting” indicated on the controller display), the compressor will remain OFF.

The defrost termination will occur when Evap Temp 1 reaches 55F (adjustable via Settings→Equipment→Defrost Termination Temp), or when the 1 hour defrost time limit is reached (adjustable via Settings→Equipment→Def. Max Run Time).

When the defrost cycle ends, the controller will allow a 5-minute Drain Time with the EEV still closed and evaporator fans turned off. At this time, if the Suction Pressure has risen above the Cut-Out Setpoint + Cut-In Offset, the compressor (Aux Relay 2) will be allowed to momentarily turn on if needed to keep the system pumped down. When the Drain Time ends, the controller will open the EEV to begin the next cooling cycle.

COOLER • Air Defrost

Default defrost logic is based on cooling run time (default 6 hours; can be adjusted via Settings→Equipment→Def. Cmp. Run Time). Adaptive Defrost is not applicable for Cooler (air defrost) setting.

When the defrost cycle starts, the controller will close the EEV to force a pump down and keep the evaporator fans running at low speed after the compressor has turned OFF. While the controller is undergoing a defrost cycle (“Defrosting” indicated on the controller display) the compressor will remain OFF.

The defrost termination will occur when Evap Temp 1 reaches 40F (adjustable via Settings→Equipment→Defrost Termination Temp), or when the 1 hour defrost time limit is reached (adjustable via Settings→Equipment→Def. Max Run Time).

When the defrost cycle ends, the controller will open the EEV to begin the next cooling cycle.

CONTROLLER OPERATION ECONET

The EcoNet Evaporator Controller on the PRS controls the following:

1. Evaporator fans On/Off via Auxiliary Relay 1.
2. Compressor On/Off via Auxiliary Relay 2, based on Suction Pressure Cut-Out and Offset setpoints.
3. Electronic Expansion Valve (EEV) to control superheat with readings from Suction Temperature sensor and Suction Pressure transducer. EEV will also fully close for system pump down.
4. Defrost (Air or Electric) based on cooling runtime or adaptive defrost algorithms.

NOTES

• Controller version HT-PG01-00-01-23 or newer is required for PRS operation.
• Verify Voltage Selector Switch is set to the correct setting (115V or 230V) before applying power to the unit.
  

CONTROLLER CONFIGURATIONS FOR PRS OPERATION Scan QR code to access EcoNet Controller IOM for a complete list of configuration settings

for Cooler units
Cut-In Offset| 10 PSIG to 50 PSIG| “20 PSIG”
Def. Pmp. Dn. Delay| None; 1 min; 2 mins; 3 mins; 4mins; 5 mins| “1 min” for Comp-Fan Control; “None” for Fan Control

CONFIGURATION SETTINGS

Navigate to Settings→Equipment on controller display to view/adjust:

1. Aux Relay Config.
   a. Comp-Fan Control: Controller will use Auxiliary Relay 1 for evaporator fan on/off control, and Aux Relay 2 for compressor on/off control based on Suction Pressure transducer reading. Applicable to PRS. NOTE: PRS MUST be set to Comp-Fan Control or damage to equipment will result!!!
   b. Fan Control: Controller will use Auxiliary Relays 1 and 2 to control dual speed fan motors on evaporator. This setting is not applicable for PRS!!!

2. Cut-Out Setpoint: Pressure setpoint at which the compressor will turn off.

3. Cut-In Offset: Pressure differential for compressor to turn on.

4. Def. Pmp. Dn. Delay: Defrost pump down delay for Freezer units; when an electric defrost cycle starts, the controller will wait the specified amount of time after the EEV closes to allow for compressor pump down before turning on the defrost heaters

With Aux Relay Config. set to Comp-Fan Control, the EcoNet controller will rely on the Suction Pressure transducer reading to determine when to cycle the compressor ON or OFF via Auxiliary Relay 2. When a cooling cycle starts, the controller will open the EEV which will cause the Suction Pressure to increase.

The compressor will turn ON when: Suction Pressure (PSIG) is greater than Cut-Out Setpoint + Cut-In Offset

To prevent compressor short cycling, when a cooling cycle starts (EEV opens) the controller will keep the compressor on for a minimum amount of time even if the Suction Pressure briefly gets below the Cut-Out Setpoint.

When a cooling cycle ends (setpoint is satisfied, defrost starts, etc.), the controller will close the EEV. The compressor running will cause the Suction Pressure to decrease.

The compressor will turn OFF when: Suction Pressure (PSIG) is less than the Cut-Out Setpoint

When there is no call for cooling (EEV is closed), the compressor will turn off immediately whenever the Suction Pressure drops below the Cut-Out Setpoint.

EXAMPLE 1 • Low Temperature Unit

Cut-Out Setpoint = 0 PSIG
Cut-In Offset = 20 PSIG
Compressor will turn ON when Suction Pressure is greater than 20 PSIG.
Compressor will turn OFF when Suction Pressure is less than 0 PSIG

EXAMPLE 2 • Medium Temperature Unit

Cut-out Setpoint = 20 PSIG
Cut-In Offset = 20 PSIG
Compressor will turn ON when Suction Pressure is greater than 40 PSIG.
Compressor will turn OFF when Suction Pressure is less than 20 PSIG.

NOTE

If the unit is defrosting, the controller will not allow the compressor to turn on. When the unit is not defrosting, the controller will allow the compressor to turn on for the next cooling cycle when the EEV opens, or for pump down if needed while the EEV is closed.

TROUBLESHOOTING MODES OF OPERATION: MEDIUM TEMP

Def Htrs
| –| –| –| –| –| –| –| –| –| Off| Off| Off| Off| –| –
| Cooling Active| Bypass| –| –| –| –| | | –| On| Off| Slow| Fast| –| –
| Cooling Active| Bypass| –| –| –| –| | | –| On| Off| Fast| Fast| –| –
| Cooling Active| –| | –| –| –| –| –| –| Off| On| Off| Slow| –| –
| Cooling Active| –| | –| –| –| | | –| On| Off| Slow| Fast| –| –
| Cooling Active| –| | –| –| –| | | –| On| Off| Fast| Fast| –| –
| Cooling Active| –| –| –| –| –| ****| –| –| Off| On| Off| Slow| –| –
| Cooling Satisfied| –| –| –| –| –| –| –| –| Off| On| Off| Slow| –| –
| Defrost| –| –| –| –| –| –| –| –| Off| On| Off| Slow| –| –

Closed
Open

NOTE

• “-” implies that the feature is either not applicable or that the feature does not affect this mode of operation.
• Control inputs identified with * are on board the EcoNet 1.0 controller.

Def Htrs
| –| –| –| –| –| –| –| –| –| Off| Off| Off| Off| Off| Off
| Cooling Active| Bypass| –| –| –| –| | | –| On| Off| Slow| Fast| –| –
| Cooling Active| Bypass| –| –| –| –| | | –| On| Off| Fast| Fast| –| –
| Cooling Active| –| | –| –| –| –| –| –| Off| On| Off| Slow| –| –
| Cooling Active| –| | –| –| –| | | –| On| Off| Slow| Fast| –| –
| Cooling Active| –| | –| –| –| | | –| On| Off| Fast| Fast| –| –
| Cooling Active| –| –| –| –| –| | –| –| Off| On| Off| Slow| –| –
| Cooling Satisfied| –| | –| –| –| –| –| –| Off| On| Off| Slow| –| –
| Defrost| –| | Pmp dwn| –| –| | | –| On| Off| Slow| Fast| Off| Off
| Defrost| –| | Pmp dwn| –| –| | | –| On| Off| Fast| Fast| Off| Off
| Defrost| –| | Delay| –| –| –| –| –| Off| On| Off| Slow| Off| Off
| Defrost| –| | –| –| –| –| –| | Off| On| Off| Off| On| On
| Defrost| –| | –| –| –| –| –| | Off| On| Off| Off| Off| Off
| Defrost| –| | –| Delay| –| –| –| –| Off| On| Off| Off| Off| Off
| Cooling Active| Bypass| –| –| –| Delay| | | –| On| Off| Slow| Off| Off| Off
| Cooling Active| Bypass| –| –| –| Delay| | | –| On| Off| Fast| Off| Off| Off

ELECTRICAL WIRING DIAGRAMS MEDIUM TEMP AIR DEFROST 115/1 OR 208-230/1

ELECTRICAL WIRING DIAGRAMS LOW TEMP ELECTRIC DEFROST 208-230/1

![ELECTRICAL WIRING DIAGRAMS

LOW TEMP ELECTRIC DEFROST 208-230/1](https://manuals.plus/wp- content/uploads/2023/10/Screenshot_15-294.png)

PIPING DIAGRAMS

REPLACEMENT PARTS

Below is list of common replacement parts. Should you need something outside of this list, please call our Parts Team at 1-855-HTPARTS (1-855-487-2787) or email Parts@htpg.com.

SHIPPED LOOSE ACCESSORIES

PRS shown with outdoor weather hood and hail guard option. The weather hood and hail guard are shipped loose and field assembled and installed. Sizes are available for both cabinets.

WARRANTY

The Seller warrants against defect in materials and workmanship in products which it manufactures for (1) year from the date of installation or up to 18 (eighteen) months from the date of shipment, whichever event occurs first, when properly installed and operated under normal use. This guarantee does not include any labor or other charges made outside of the Seller’s factory for replacement or repair of defective parts unless specifically stated in the body of the Sellers invoice. On parts not manufactured by HTPG, such as motors, controls, valves and compressors we extend to the Buyer the same warranties  made to us by the manufacturer.

The Seller’s only liability under this warranty or otherwise shall be the repair or replacement (at Seller’s option) of nonconforming goods or parts. Seller assumes no liability for incidental or consequential damages such as injury to persons or property, or lost profits.

Claims must be submitted to our Warranty Group within 90 days of the repair. To submit a claim, visit https://www.htpg.com/submit-a-claim/

GET A DIGITAL VERSION OF THE GUIDE

by scanning this QR code or the one located in the ebox of the unit

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©2023 Heat Transfer Products Group
Published March 2023
HTPG2303IOMPRS

References

• HTPG | Commercial and Industrial Refrigeration Products – HTPG (Heat Transfer Products Group)
• HTPG | Commercial and Industrial Refrigeration Products – HTPG (Heat Transfer Products Group)
• HTPG | Submit a Claim

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