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Marsh Bellofram Diversified Electronics Division AC-503 Series HVAC Delay-On-Break Timer

Marsh Bellofram Diversified Electronics Division AC-503 Series HVAC Delay-On-Break Timer

Product catalog summary

Overview: The AC-503 Series is a family of HVAC controls designed to provide short cycle protection by locking out the compressor for a set period after a voltage or thermostat interruption. This ensures that subsequent interruptions do not extend the delay period, maintaining temperature control unaffected.

Key Features:

Operates on control voltages ranging from 19 VAC to 288 VAC.
Simple installation with a two-terminal device that connects in series with the control voltage, thermostat, and control relay.
Provides true thermostat interruption protection even with continuous current flow through the thermostat’s cooling anticipator.

Specifications:

Control Voltage: 24/120 or 208/240 VAC
Output Rating: 250 VA Inrush; 25 VA Run @ 24 VAC, or 1250 VA Inrush; 125 VA Run @ 120/240 VAC
Time Delay: Adjustable from 0.1 to 5 minutes
Dimensions: 2.0" x 2.0" x 0.75" high
Weight: 2.5 oz.

Installation Note: For 120/240 VAC control circuits, the external jumper should be cut to disable the 24 VAC bypass circuit.

Ordering Information: Model Number: AC-503 Delay-On-Break Timer

Catalog excerpts

Marsh Bellofram Diversified Electronics Division AC-503 Series HVAC Delay-On-Break Timer-1

AC-503 Series Diversified Electronics atcdiversified.com 800.727.5646 266HVAC Controls // AC-503 Series This family of HVAC controls provides short cycle protection by locking out the compressor for a period of time after a voltage or thermostat interruption. Subsequent interruptions will not increase the delay period. Since the delay begins when the interruption occurs, the temperature control is not affected. Under normal operating conditions, the compressor off time is longer than five (5) minutes. In this case, the use of these timers will not lengthen this off cycle. This field adjustable model will operate on control voltages of 19 VAC through 288 VAC. Unlike most universal voltage timers, the AC-503 is a two (2) terminal device that simply connects in series with the control voltage, thermostat and control relay making for easy installation. This timer is engineered to provide true thermostat interruption protection even when there is a continuous current flow through the thermostat’s cooling anticipator. NOTE: When used on 120/240 VAC control circuits, the external jumper should be cut. This disables the 24 VAC bypass circuit. D e l a y - O n - B r ea k T ime r s \\\ORDERING INFORMATION MODEL NUMBER DESCRIPTION AC-503 Delay-On-Break Timer \\\SPECIFICATIONS CONTROL VOLTAGE 24/120 or 208/240 VAC OUTPUT RATING 250 VA Inrush; 25 VA Run @ 24 VAC, or 1250 VA Inrush; 125 VA Run @ 120/240 VAC TIME DELAY 0.1 to 5 min. Adjustable DIMENSIONS 2.0" x 2.0" x .75" high WEIGHT 2.5 oz. \\\WIRING

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