Evaporator Defrost Control - Foundation Packaged Rooftop Units 3 to 5 Tons - Installation Instructions

Oct 4, 2026

Uploaded by Miles

Installation instructions for the evaporator defrost control (EDC/Frostat) used with Foundation packaged rooftop units rated 3 to 5 tons, including model-number mapping and placement on the indoor evaporator coil face area. Covers safety warnings, inspection steps for shipping damage, verification of correct accessories, and a parts list. Provides installation and servicing precautions covering hazardous voltage, field wiring/grounding requirements, personal protective equipment, and responsible refrigerant handling for environmental compliance, including reference to U.S. Federal Clean Air Act Section 608.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages2

Reading Time5 min

AccessFree to download

General Information

Inspection

Parts List

Warnings, Cautions, and Notices

Important Environmental Concerns

Important Responsible Refrigerant Practices

Installation

Hazardous Voltage w/Capacitors

Proper Field Wiring and Grounding Required

Personal Protective Equipment (PPE) Required

Installation Instructions Evaporator Defrost Control Foundation ™ Packaged Rooftop Units 3 to 5 Tons Model Number: Used With: BAYLOAM330* E/GB*036-060 E/GD*036-060 | | SAFETY WARNING | | --- | --- | | Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment. | | August 2024 ACC-SVN185D-EN ©2024 |
General Information
• The evaporator defrost control (EDC or Frostat™) is installed in the evaporator (Indoor) coil face area.
• The EDC should cycle the compressor when the evaporator frosts under low outdoor ambient cooling conditions or low airflow applications.
• The EDC indicates when the evaporator is 10ºF (-12 .2ºC) or below. It resetsat 60ºF (15 .6ºC) .
Inspection
1. Check carefully for shipping damage. If any damage is found, report it immediately, and file a claim against the transportation company. Replace damaged parts with authorized parts only.
2. Compare the order number on the shipping label with the accessory identification information on the ordering and shipping documents to verify that the correct accessory has been received.
Parts List
Table 1. Parts list | | | | --- | --- | --- | | Qty | Description | | | 1 | Frostat™ Defrost Control | | | 5 | Wire Ties | | | | | | |
1
Warnings, Cautions, and Notices
Read this manual thoroughly before operating or servicing this unit. Safety advisories appear throughout this manual as required. Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions. | | --- | | The three types of advisories are defined as follows:
WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.
It could also be used to alert against unsafe practices. NOTICE Indicates a situation that could result in equipment or
~~ ~~ property-damage only accidents. | Important Environmental Concerns Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs) . Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants. Important Responsible Refrigerant Practices Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified according to local rules. For the USA, the Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them. | 5
Installation
| | --- | |
WARNING | | Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.
Disconnect all electric power, including remote disconnects and discharge al

FAQs

What is the evaporator defrost control (EDC/Frostat) and where is it installed?

The evaporator defrost control (EDC, also called Frostat) is installed in the evaporator (indoor) coil face area. It cycles the compressor when the evaporator frosts under low outdoor ambient cooling conditions or low airflow applications.

What inspection steps are recommended before installation?

Check carefully for shipping damage and report it immediately while filing a claim with the transportation company. Compare the order number on the shipping label with accessory identification information on the ordering and shipping documents to ensure the correct accessory was received.

What safety precautions must technicians follow during installation or servicing?

Disconnect all electric power and discharge capacitors before servicing, following proper lockout/tagout procedures. Ensure proper field wiring and grounding per NEC and local codes, and wear required personal protective equipment (PPE), always referring to relevant SDS and OSHA guidance.

Oct 4, 2026

Uploaded by Miles