Heat Siphon C375HP - User Manual

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Copyright 2019 United States ThermoAmp Inc. ALL RIGHTS RESERVED

Publisher: United States ThermoAmp Inc.

1223 Heat Siphon Lane , Latrobe, Pa. 15650

724-537-3500

Owner’s Manual

with Installation & Troubleshooting Instructions

For Heat Siphon® Swimming Pool Heat Pumps

All Z & C Series Heat Siphon Models including

220Volt -1 Ph-60 Hz ONLY: C200HP, C250HP, C375HP, C575HP, Z250HP, Z375HP , Z575HP, Z700HP

220Volt -1 Ph-50 Hz ONLY: C200HP50, C250HP50, C375HP50, C575HP50, Z250HP50, Z375HP50 , Z575HP50

220Volt -3 Ph-50/60 Hz: C250HP3, C375HP3, C575HP3, Z250HP3, Z375HP3 , Z575HP3, Z700HP3

380/460 Volt - 3 Phase - 50/60 Hz - C200HPX, C250HPX, C375HPX, C575HPX, Z250HPX, Z375HPX, Z575HPX, Z700HPX

440 Volt - 3 Phase - 60Hz - C575HP4, Z575HP4, Z575HP4, Z700HP4

200,375,575 Series Heat Only Models 575HC and 700HP Series Models

Table of Contents

Questions and Answers

M
Michael BarkerAug 10, 2025
What to do if my Heat Siphon C375HP Heat Pump is leaking water?
- G
  gmillerAug 10, 2025
  First, determine if the leaking water is normal condensation. Condensation occurs as the unit cools off warm, humid air. To resolve this, turn off your Heat Siphon, keep your pool pump on, and wait until the basepan empties. If the basepan doesn't empty but the leaking stops, it's still condensation, but your drain is blocked. Unclog the barb drain fitting and/or replace the vinyl drain tubing. Test the leaking water for chlorine. If it tests negative, it's condensation. If the water has chlorine and the leak continues, contact your dealer.
B
bradley78Aug 16, 2025
Why my Heat Siphon C375HP does nothing?
- J
  jillblackAug 16, 2025
  Several factors could cause this. The air temperature might be too cold; if it's below approximately 42°F, the unit will shut off automatically to prevent icing. Wait for the air temperature to reach 45°F to 48°F for the unit to automatically reset and turn on. Alternatively, a brief power interruption might have activated a time delay. Wait 5 minutes for the unit to restart. Also, check if the breaker is tripped, which could indicate a bad breaker, faulty wiring, loose wires, or a poor connection in the junction box. Have your installer check the wiring and breaker.
B
Bruce SmithAug 25, 2025
What to do if my Heat Siphon C375HP tries to start then does nothing?
- W
  wangjohnAug 25, 2025
  This issue can arise from a few causes. A brief power interruption might have activated the time delay. In that case, wait 5 minutes for the unit to restart. If the air temperature is below 45°F to 48°F and the pool water is cold, wait for both to reach 50°F for the unit to restart automatically and resume normal heating. Also, ensure the pool filter is clean and the pool water flow is stable; restore the correct water flow if needed.
L
lstoneAug 31, 2025
How to troubleshoot a Heat Siphon C375HP that runs but doesn't heat?
- K
  Katrina LeeAug 31, 2025
  Several factors could be at play. Check if the air leaving the unit is colder than usual. Also, ensure the pool pump is running long enough each day; run it continuously for 24 hours to determine the required time. If it's still not heating, contact your dealer. Consider whether there's abnormally high heat loss, such as no cover on an extremely windy day. Cover the pool and run the pool pump for 24 hours. If it's still not heating, contact your dealer.

Summary

Owners Section

How Heat Siphon Works

Explains the basic principles of how a Heat Siphon heat pump operates.

Use a Qualified Installer

Emphasizes the importance of using a qualified installer for proper unit installation.

Plan Your Installation

Outlines crucial considerations for planning the unit's installation.

Pool Heating Considerations

Owner Troubleshooting

Provides guidance for owners experiencing problems with their Heat Siphon unit.

Maintenance & Winterizing

Covers routine maintenance procedures and winterizing steps for the unit.

Installer Section

Planning Installation

Emphasizes reading installation planning details before starting the process.

Physical Location

Provides guidelines for selecting the optimal physical location for the unit.

Prohibited Locations

Lists locations where installation is prohibited to avoid warranty issues.

Pool Piping Required

Details the required pool piping and plumbing arrangements for the unit.

Electrical Power Required

Specifies the necessary electrical power requirements for the Heat Siphon unit.

Wiring Heat Siphon

Provides comprehensive instructions for wiring the Heat Siphon unit correctly.

Electrical Hookup on Unit

Code Requirements

Lists relevant National Electrical Code requirements for proper installation.

Circuit Breaker Size

Supply Circuit Wire Size

GFCI Breaker Protection

Explains the importance and connection procedure for GFCI breaker protection.

Electrical Disconnect Switch

Discusses the requirement and placement of an electrical disconnect switch.

Electrical Bonding Requirements

Details the electrical bonding requirements according to National Electrical Code.

Final Power Line Wiring

Details the final steps for completing the power line wiring to the unit.

Final Plumbing into Pool or Spa

Provides instructions for the final plumbing connections to the pool or spa.

Initial Start-up

Initial Performance Checks

Steps to perform initial checks after the unit installation is completed.

First Startup of Analog Models

Procedure for the initial startup of analog model Heat Siphon units.

First Startup of Digital Models

Adjusting the Water Pressure Switch

Digital Player Section

Reading The Player Display

Changing Pool Temperature

Instructions on how to adjust the desired pool or spa temperature setting.

Player Operating Modes

TEST Mode

Warning and procedure for exiting TEST mode if accidentally entered by the user.

Switching Modes

Pool;Spa;Auto;Off

Switching Modes - For Heat;Cool Units Only

Error and Warning Codes

Lists and explains error and warning codes displayed by the unit's player.

Low Refrigerant Pressure (Lo P)

Details the 'Low Refrigerant Pressure' alert code and its potential causes.

Low Air Temp. Warning (Lo A)

Explains the 'Low Air Temperature' warning code and its self-correcting nature.

High Refrigerant Pressure (Hi P)

Describes the 'High Refrigerant Pressure' alert code and its common causes.

Low Water Flow (Lo; FLO)

Explains the 'Low Water Flow' alert code and provides troubleshooting steps.

Water Sensor Open (SH 0)

Water Sensor Short (SH S)

High Volts (Hi; UoLt)

Low Volts (Lo; UoLt)

Main Contactor Short (HS S)

Main Contactor Open Circuit (HS 0)

Cant Heat (CAnt; HEAt)

Describes the 'Can't Heat' warning code and its common reasons.

Air Temp Sensor Open (SA o)

Air Temp Sensor Short (SA S)

No POD (no; Pod)

PumpJump Coil Short (PJ S)

No Flow w; Pump Jump(Lo F; Pod)

Explains the 'No Flow w/ Pump Jump' alert code.

Flow w; Pump Jump (FLO; Pod)

Pod Coil Open (no; Pod)

Low Air Temperature (COLD; xxF)

Reversing Valve Coil Open (CH 0)

Reversing Valve Coil Short (CH S)

Easy Pic;Clock No Board (no; EASY)

Circuit Board Errors

Lists hardware errors likely requiring player board replacement.

Analog TimerStat Pro Section

Timerstat Pro Error Codes - Status LED

Details the error codes indicated by the TimerStat Pro's status LED.

Appendix D SPA; HOT TUB Heating Issues

WARNING! Water Temperature Safety

Critical safety warning regarding water temperature and hyperthermia risks.

Thermostat Set Point Depression

Explains thermostat set point depression and methods to avoid it.

Spa Temperature Sensor Calibration

Heat Siphon C375HP Specifications

General

Model	C375HP
Category	Heat Pump
Power Supply	208-230V
Power Supply Phase	Single Phase
Max Current	30 A
Refrigerant	R-410A
Weight	275 lbs

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