Dayton
Dayton 4Z827 HVAC control 0-90/180V DC open 25:1 speed range
Controls DC motor speed from 0 to 90 or 180 volts with a 25:1 range and single-direction rotation
- ColorTransparent
- Precise motor control with 25:1 speed range
- Flexible voltage output from 0 to 90/180V DC
- Broad AC input compatibility at 120/240V AC
- Suitable for fractional horsepower motors 1/50 to 1/6 hp
- Simple single-direction operation with external on/off switch
Speed Control for HVAC Motors
The Dayton 4Z827 is an SCR-based DC speed control designed for HVAC applications. It accepts 120 or 240V AC input and provides a variable 0 to 90/180V DC output for compatible motors. The unit operates in a single direction and includes an external ON/OFF switch for basic operation. It is suited for installers needing simple, open-frame motor speed regulation.
Output Range and Motor Capacity
The control delivers a 25:1 speed range across the 0 to 90/180V DC output span. It is rated to drive motors with an output power between 1/50 and 1/6 hp. This capacity covers small fractional-horsepower loads typical in ventilation and blower assemblies. Motors outside this power window or requiring reversible rotation are not supported by this device.
SCR Topology and Voltage Constraints
The SCR circuit varies DC voltage by phase-angle control of the AC supply, so output quality depends on the incoming 120/240V AC waveform. The fixed 0 to 90/180V DC ceiling means motors rated for higher armature voltages cannot reach full speed. The open-frame construction requires a separate enclosure to meet installation safety codes.
Highlights
- Precise motor control with 25:1 speed range
- Flexible voltage output from 0 to 90/180V DC
- Broad AC input compatibility at 120/240V AC
- Suitable for fractional horsepower motors 1/50 to 1/6 hp
- Simple single-direction operation with external on/off switch
Specifications
| Brand | DAYTON |
|---|---|
| Color | Transparent |
Questions about this item
Will the 0-90/180V DC output drive my existing 1/50 to 1/6 hp motor?
Yes, the control is rated for motor output power from 1/50 to 1/6 hp with a 0 to 90/180V DC output range.
How can I verify the 25:1 speed range is functioning after installation?
Confirm the motor runs smoothly across the full adjustment span and check that the ON/OFF external switch toggles power cleanly.
Does the open-frame unit include the external ON/OFF switch or must I source it separately?
The description lists external switches ON/OFF as a feature; the switch itself is not confirmed as included, so plan to provide a compatible switch.
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