MODINE DFG Mild Temperature Thermostat Installation Guide

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5-583.3  

5H0763420000  

March, 2024  

INSTALLATION & SUBMITTAL DATA  

mild temperature thermostat  

gas-fired duct furnaces  

model series DFG, DFP, DFS, and HFP  

IFG, IFP, IFS, and OFP  

Application  

The mild temperature duct thermostat is shipped loose for field  

installation in the inlet air stream so that it senses outdoor air  

temperature. The purpose of the mild temperature thermostat  

is to automatically disable the gas controls when the inlet  

air temperature reaches the desired setpoint to prevent the  

furnace from excessively cycling at mild outside air temperature  

WARNING  

1. Disconnect power supply before making wiring  

connections or working on this equipment. Follow all  

applicable safety procedures to prevent accidental power  

up. Failure to do so can result in injury or death from  

electrical shock or moving parts and may cause equipment  

damage.  

conditions. The mild temperature thermostat is usually field  

set at approximately 60°F or 5°-10°F below the duct or room  

thermostat.  

2. All appliances must be wired strictly in accordance with  

wiring diagram furnished with the appliance. Any wiring  

different from the wiring diagram could result in a hazard to  

persons and property.  

Component Specifications  

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Model A19AAF-12  

3. All wiring must be done with a wiring material having a  

temperature rating of at least 105°C.  

Switch Action: Single Pole, Double Throw  

Temperature Range: 25 to 225°F  

Differential: Fixed at 3-1/2°F  

Bulb Size: 3/8 inches x 3 inches long  

Capillary Length: 10 feet  

Range Adjustor: Screwdriver Slot  

Maximum Bulb Temperature: 275°F  

Enclosure: NEMA 1 rated  

IMPORTANT  

1. The use of this manual is specifically intended for a  

qualified installation and service agency. All installation  

and service of these units must be performed by a  

qualified installation and service agency. Modine manuals  

may contain excerpts from component supplier literature  

adapted for Modine products. Any accompanying  

Switch Ratings (SPDT relay contacts):  

component supplier literature is for general information.  

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Normally Open and Normally Closed Contact:  

6.0 A @ 120V, 3.0 A @ 240V  

125VA pilot duty at 24-277VAC  

2. These instructions must also be used in conjunction with  

the Installation and Service Manual originally shipped  

with the appliance, in addition to any other accompanying  

component supplier literature.  

Installation  

Select a location in the inlet air stream where the temperature  

element senses the average outdoor air temperature and is  

free in air circulation. Hold the temperature elements in the air  

stream with either a field supplier duct sensor holder or a bulb  

mounting clip. The control must be located in an area suitable  

for a NEMA 1 enclosure. The control is normally mounted to a  

surface through holes in back of the case.  

Do not dent or deform the sensitive bulb of the control. A dent  

or deformation will change the calibration and cause the control  

to cycle at a temperature lower than the dial setting. When the  

bulb mounting clip is used to mount the bulb in the air stream,  

be sure the sheet metal screw does not pierce the tubing.  

THIS MANUAL IS THE PROPERTY OF THE OWNER.  

PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.  

VIEW FULL SCREEN PDF MANUAL

General	Details
Name	MODINE DFG Mild Temperature Thermostat Installation Guide
Make	Modine
Language	English
Filetype	PDF (Download)
File size	0.1 MB

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• Modine

MODINE DFG Mild Temperature Thermostat Installation Guide Overview

Summary of Contents

• Page 1: Installation & submittal data Mild temperature thermostat for gas-fired duct furnaces. The thermostat is shipped loose for field installation in the inlet air stream. It senses outdoor air temperature to automatically disable gas controls. The thermostat prevents excessive cycling at mild outside air temperatures. Disconnect power supply before making wiring connections. All appliances must be wired according to the provided wiring diagram. Wiring must use materials rated for at least 105°C. Installation must be performed by a qualified agency. Select a location in the inlet air stream for accurate temperature sensing. Do not dent or deform the sensitive bulb of the control.
• Page 2: Installation of wiring must conform with local building codes or the National Electric Code ANSI/NFPA 70 - Latest Edition. Unit must be electrically grounded in conformance to this code. In Canada, wiring must comply with CSA C22.1, Part 1, Electrical Code. The control is supplied with an external range adjustment and screwdriver slot. Dial settings indicate the cutout setting. Use the terminal screws furnished with the control. For duct furnaces (non-factory supplied blower) refer to the wiring diagram. For deviations to these wiring diagrams or job specific wiring diagrams, consult the factory. Red to blue closes on temperature decrease, red to yellow closes on temperature increase. Modine Manufacturing Company reserves the right to change design and specifications without notice.