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© 1995-2018 Energy Saving Products Ltd.
•
The Electronic Expansion Valve is internal to the ESP Variable Speed Heat Pump, therefore a TXV at the evaporator (indoor
unit) is not needed.
Refrigeration Circuit
• Refrigeration grade copper tubing is the only tubing to be used. Fittings used for bends, elbow, ‘P’ trap, ‘Y’ piece, etc.,
must be of the wrought copper type and clean from dust, burrs, oil, etc. It is recommended that the tube is cut with a
tube cutter and the entire ID is made the correct size with an expanding device after cutting. All joints in the piping must
be clean and free from dust, burrs, oil, etc.
• All joints must be silver soldered with at least 10% silver content.
Model
Liquid Line
Suction Line
Maximum Length
Maximum Lift
ESP-36
3/8” (9.5 mm)
5/8” (15.9 mm)
213.25’ (65 m)
98.4’ (30 m)
ESP-60
3/8” (9.5 mm)
3/4” (19 mm)
213.25’ (65 m)
98.4’ (30 m)
Minimum pipe sizes, maximum length and maximum lift
Additional Refrigerant Requirement
Model
Liquid Line
Suction Line
Factory Charge (kg)
ADD REFRIGERANT
>49ft (oz/ft)
ESP-36
3/8” (9.5 mm)
5/8” (15.9 mm)
6.7 lbs (3.05 kg)
1 oz/ 3.3 ft
ESP-60
3/8” (9.5 mm)
3/4” (19 mm)
13 lbs (5.9 kg)
1 oz/ 3.3 ft
Minimum pipe sizes (up to 98’), factory charge and additional refrigerant required.
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Module VAR Variable Speed Heat Pump
Installation & Specs (5/8)
•
Pipe insulation must be used on both liquid and suction lines.
•
Maximum pipe length is 213 ft (65 m). Lines must be sized correctly to ensure that pressure drops within the system are
minimized. HVAC mechanics should refer to the pipe sizing table below prior to installation.
• The ESP comes with a factory charge. Additional charge will only be needed on line sets longer than 49 ft.
Interface Panel
• The interface panel is critical for indoor and outdoor unit communication.
• Field wiring shown on the wiring page is needed between the indoor unit and the interface panel, and between the
interface panel and the outdoor unit using shielded cable.
•
The interface panel and the outdoor unit both require 240v supply power.
• 2 temperature sensors are supplied with the interface panel, connected to the large circuit board. These temperature
sensors will need to be installed for the unit to operate properly.
Suction Line and Mid Coil Temperature Sensor
• Remove the front access panel on the evaporator coil to gain access to the suction and mid coil temperature ports.
• The temperature ports are just a short piece of open ended copper tube.
• The suction port is located on the suction header. This is where the suction temperature sensor should be located and
secured.
• The mid coil port is located on one of the “U-bends” in the middle of the coil. This is where the mid coil temperature sensor
should be located and secured.
• Both of these temperature sensors/ports should be insulated with cork tape to ensure a true temperature reading of the
tube and not of the ambient temperature.
