Pentair ULTRATEMP 120 - User Manual

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ULTRATEMP

®

HEAT PUMP

INSTALLATION AND

USER’S GUIDE

IMPORTANT SAFETY INSTRUCTIONS

READ AND FOLLOW ALL INSTRUCTIONS

SAVE THESE INSTRUCTIONS

ESPAÑOL

ENGLISH

FRANÇAIS

Table of Contents

Questions and Answers:

W
williamlewisSep 5, 2025
Why is my Pentair ULTRATEMP 120 showing a high water temperature alarm?
- G
  Gary AdamsSep 6, 2025
  A high water temperature alarm on your Pentair Heat Pump indicates that the water temperature is above 107°F [41.7°C]. This can be due to a bad thermistor or a bad control board. Test the water temperature to ensure it's accurate. If the temperature reading is incorrect, use a 10k ohm resistance test to verify the thermistor. Replace the thermistor if it's faulty; otherwise, replace the control board.
C
Christina EvansNov 19, 2025
Why does my Pentair Heat Pump show a high refrigerant alarm?
- S
  susan53Nov 20, 2025
  A high refrigerant alarm on your Pentair Heat Pump can stem from several issues. Begin by confirming that the water circulation pump is active and that there's sufficient water flow, ensuring filters and skimmers are clean via backwashing if needed. Also, check that any external water bypass around the heat pump is closed and all other valves are correctly positioned for proper water flow. A faulty refrigerant high-pressure switch could be the cause; check its resistance and replace if open. Other potential causes include a TXV stuck closed, in which case you should disconnect the TXV bulb from suction line, have it in your hand, if pressures go back to normal, then reinstall the bulb on suction line. For adjustable TXVs open adjustable valve, it may remove the debris and set it back to or...
M
Mr. Jason MartinezSep 18, 2025
What does remote pool spa alarm mean on Pentair ULTRATEMP 120 Heat Pump?
- K
  Karen BakerSep 18, 2025
  A REMOTE POOL SPA alarm on a Pentair Heat Pump indicates that the remote pool, spa, and common spade terminals on the back of the control board are all energized at the same time. To resolve this, modify the automation control output so that only either the pool and common or spa and common terminals are energized, but not all simultaneously.
C
cynthiaspenceSep 16, 2025
How do I fix a suction th open alarm on my Pentair ULTRATEMP 120?
- P
  Patrick CaseSep 16, 2025
  To address a suction th open alarm on your Pentair Heat Pump, which indicates an open defrost refrigerant temperature sensor circuit, begin by using the 10k ohm resistance test to verify the thermistor. If the test reveals an open circuit, replace the thermistor. If the thermistor is functioning correctly, the issue likely lies with the control board, necessitating its replacement.
T
Tami MaldonadoSep 14, 2025
What does suction th short alarm mean on Pentair ULTRATEMP 120 Heat Pump?
- J
  julie03Sep 14, 2025
  If your Pentair Heat Pump displays a suction th short alarm, it indicates that the defrost refrigerant temperature sensor circuit is shorted. This is often due to a faulty thermistor or a bad control board. To fix this, use the 10k ohm resistance test to check the thermistor. If the test shows a short, replace the thermistor. If the thermistor is good, the problem is likely the control board, which will need to be replaced.
B
Becky DixonSep 12, 2025
How to troubleshoot a water therm open alarm on a Pentair ULTRATEMP 120 Heat Pump?
- G
  gowenSep 13, 2025
  To troubleshoot a water therm open alarm on your Pentair Heat Pump, which indicates an open water temperature sensor circuit, start by testing the thermistor using the 10k ohm resistance test. If the test shows an open circuit, replace the thermistor. If the thermistor tests good, the issue is likely with the control board, which should be replaced.
J
Jesus JohnsonSep 12, 2025
What to do if Pentair Heat Pump shows water therm short alarm?
- E
  Elizabeth SantanaSep 12, 2025
  If your Pentair Heat Pump displays a water therm short alarm, it means the water temperature sensor circuit is shorted. This is often due to a bad thermistor or a bad control board. To resolve this, use the 10k ohm resistance test to verify the thermistor. If the test shows a short, replace the thermistor. If the thermistor is good, then the control board needs to be replaced.
W
Wayne SmithSep 9, 2025
What does it mean when my Pentair ULTRATEMP 120 displays a low water temperature alarm?
- L
  Leslie ComptonSep 9, 2025
  A low water temperature alarm on your Pentair Heat Pump indicates that the water temperature is below 40°F [4.4°C]. This can be caused by a bad thermistor or control board, or debris shorting the connections. First, test the water temperature to see if the reading is correct. If it is not, use the 10k ohm resistance test to verify the thermistor. Replace the thermistor if it is bad, otherwise, replace the control board. Also, remove any debris or replace the PCB.
J
Joshua HaynesSep 7, 2025
Why is ice forming on my Pentair Heat Pump?
- A
  Amanda OwensSep 7, 2025
  Ice or frost forming on the outer air coil of your Pentair Heat Pump, typically at the bottom, can occur if the discharge air flow is restricted. Ensure the heater is installed with the required placement clearances for air flow and roof clearance, and do not install it indoors. Also, ensure sprinklers do not spray on the heater. Another cause could be that the outside air temperature is too low and the defrost feature is not enabled. Make sure heater is installed with the required placement clearances for air flow and roof clearance, and do not install it indoors. If ice forms, shut off the heater and allow the ice to thaw.
P
Patrick MendezAug 22, 2025
What causes a low refrigerant alarm on a Pentair Heat Pump?
- T
  Terry HarrisAug 23, 2025
  A low refrigerant alarm on your Pentair Heat Pump can occur due to several reasons. The most common cause is low refrigerant in the system, which requires locating and fixing the refrigerant leak, then pulling a vacuum and recharging the system. It can also happen if the air and water temperatures are too cold for the heat pump to operate; in this case, wait for warmer temperatures. A faulty refrigerant low-pressure switch can also trigger the alarm; check its resistance with a full charge and replace it if open. Lastly, a faulty fan, capacitor or fan motor could be the problem; inspect these components and replace if needed, also check the fan blade and make sure it is not slipping or broken and replace if needed.

Pentair ULTRATEMP 120 Specifications

General

Model	ULTRATEMP 120
Heating Capacity	120, 000 BTU/hr
COP (Coefficient of Performance)	5.0
Refrigerant Type	R-410A
Phase	Single
Hertz	60 Hz
Weight	350 lbs
Voltage	208/230V
Maximum Current	50 A
Operating Temperature Range	40°F - 100°F

Summary

Important Safety Instructions

Important Warning and Safety Instructions

Codes and Standards

Details installation requirements based on national and local building codes.

Consumer Safety Guidelines

Provides safety rules for spa and hot tub use, including temperature limits and health precautions.

Ultratem Heat Pump Overview

Heat Pump Installation Requirements

Details the essential requirements for safe and proper heat pump installation.

General Installation Information

Provides essential guidance for installers regarding codes, power sources, and unit design.

Installation and Location

Materials Needed for Installation

Lists all necessary materials to be supplied by the installer for heat pump installations.

Equipment Pad Requirements

Location and Clearances

Anchor Clamp Installation

Water Connections and Plumbing

Automatic Flow Control Valve

Heat Pump Water Connections

Drainage Connection and Hose Barb Installation

Water Pressure Switch Adjustment

Electrical Connections and Wiring

General Information and Bonding

Main Power Wiring

Details the procedure for connecting the heat pump to the main electrical power source.

Wiring Diagram - Single Phase

Wiring Diagram - Three Phase

Connecting to an Automation System

Remote Operation and Relay Controls

Connecting via Spade Terminals

Connecting via RS-485 Connector

IntelliTouch;EasyTouch Connection Details

Pin Configuration for Control Board to IntelliTouch

Connecting IntelliTouch or EasyTouch to Heat Pump

Operating the Heat Pump

Heat Pump Control Panel Overview

Using the Control Panel

Starting, Stopping, and Mode Selection

Timers and Delays

Control Panel Alarm Messages

Lists common alarm messages, their causes, and corrective actions.

MAINTENANCE

Water Chemistry

Emphasizes the importance of proper water chemistry for heat pump longevity and performance.

Winterizing and Spring Start Up

Inspection and Service

Owner Inspection

Maintenance Details

Owner Inspection, Continued

Professional Maintenance and Service

Recommends annual professional maintenance for optimal performance and efficiency.

TECHNICAL INFORMATION

Electrical Specs and Temperature Charts

Details voltage requirements, circuit ampacity, and temperature resistance data.

TROUBLESHOOTING

Electrical Shock and Electrocution Warning

Reiterates critical warnings regarding electrical hazards during troubleshooting.

Troubleshooting Symptoms and Solutions

Lists common problems, their possible causes, and corrective actions.

Troubleshooting Symptoms and Solutions

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