Most homeowners see their geothermal system as a black box that magicallly pulls heat from the ground, but for the HVAC technician, it is a complex thermodynamic loop where a single degree of temperature variance or a few PSI of pressure drop is the difference between an efficient system and an expensive failure.

The Philosophy: Thermodynamic Accountability

The "Service geo" template is designed for the technical specialist who understands that "it’s running" is not a diagnostic result. Geothermal systems rely on the precise exchange of heat between the earth and the refrigerant. This log moves you from guesswork to forensic engineering. By documenting the electrical and thermal baseline of every unit, you create a longitudinal history that allows you to identify failing well pumps or fouled heat exchangers long before the customer loses climate control.

The Blueprint: Technical Data Architecture

The structure of this library is built around the four critical systems of a geothermal unit.

  • The Thermal Exchange: Fields for EWT (Entering Water Temp) and LWT (Leaving Water Temp) are the foundation of efficiency analysis. Comparing these against Supply Air Temp and Return Air Temp allows you to calculate the heat extraction or rejection rate of the entire system.
  • The Refrigerant Loop: Tracking Discharge Pressure and Suction Pressure gives you an immediate window into the health of the compressor and the charge level of the system.
  • The Electrical Signature: By logging Amperage and Volts, Memento automatically calculates the Watts consumption. An unexpected spike in wattage for the same thermal output is the earliest warning sign of mechanical wear or electrical resistance.
  • Asset Documentation: High-resolution fields for Unit Dataplate, Air Handler Data Plate, and Flow Center/Well Tank ensure that you always have the correct model and serial numbers for parts ordering, even when you’re back at the office.

Usage Scenarios: The Annual Performance Audit

You are performing an annual service check on a five-year-old system. You open Memento and find the entry from the installation date. You see that the original HE or HR (Heat Extraction or Heat Rejection) value was significantly higher than your current calculation. Because you’ve logged the Well pump Model and Filter Size, you can quickly verify that the flow rates and filtration hasn't been compromised. You identify a degrading pump capacitor based on the Amperage drift and replace it on the spot, preventing a mid-winter emergency call.

Power Feature: Automated Heat Calculation

Memento’s calculation engine transforms raw measurements into actionable engineering data. The script (#{ewt}-#{lwt})*#{flow rate}*500 automatically calculates the HE or HR (BTUs per hour). This allows you to verify that the system is performing to the manufacturer’s specifications in real-time, providing the customer with quantified proof of their system’s efficiency and your professional expertise.