Where is the best placement for the thermostat in a walk in freezer?

In the return air slightly below the bottom of the coil. I did Super Market refrigeration 30 years before moving to Building Automation.

Is this single pole double throw? (spdt)?

It's been a while since I installed it but I'm pretty sure it's SPST. Used on walk in cooler.

does this unit have Compressor Delay Protection?

Ki-Jin Yoon, Thank you for your question. The Johnson Controls A421 is an electronic temperature control that includes an “Anti-Short Cycle Time Delay”. The below link is to the A421 page with some literature embedded on the page. Please let us know if you have any further questions. https://www.amazon.com/Johnson-Controls-Electronic-Temp-Control/dp/B07GB543Y7 -Johnson Controls

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CECOMINOD078043 A19ABA-40C Line V Mechanical Thermostat, 120 to 277 VAC

Product ID: 22807461

Details

Brand
Johnson
Controller Type
Push Button
Model Name
A19ABA-40C
Product Dimensions
30"D x 8"W x
Special Feature
Liquid-Filled

📏Compact 30x8x6 inch design

⚙️Liquid-filled sensing tech

🌡️Wide temp range 120-277VAC

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Description

🌡️ Stay cool, stay in control — the thermostat that means business.

ECO FRIENDLY SENSING - Advanced liquid-filled elements for reliable, sustainable performance
REMOTE WI FI CONTROL - Manage settings effortlessly with button control and Wi-Fi connectivity
VERSATILE INSTALLATION - Compact, wall-mount design fits seamlessly in any professional setting
CUSTOMIZABLE SENSITIVITY - Choose fixed or adjustable differential to suit your environment
PRECISION TEMPERATURE CONTROL - Maintain exact climate with constant differential across wide ranges

The Johnson Controls A19ABA-40C is a compact, wall-mount mechanical thermostat featuring environmentally friendly liquid-filled sensing elements. Operating across a wide voltage range of 120 to 277 VAC, it offers precise temperature control with fixed or adjustable differentials. Designed for professional HVAC applications, it supports remote button control via Wi-Fi, combining reliability with modern connectivity.

Specifications

ASIN	B003U4N74O
Additional Features	Liquid-Filled Sensing Elements, Variety of Sensing Element Styles
Backlight	No
Best Sellers Rank	#133,703 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #63 in Thermostat Controllers
Brand	Johnson Controls
Brand Name	Johnson Controls
Color	Gray
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Remote
Control Type	Button Control
Controller Type	Push Button
Customer Reviews	4.2 out of 5 stars 121 Reviews
Display Type	analog
Global Trade Identification Number	10785028083781
Included Components	1 x Control Unit
Item Dimensions D x W x H	30"D x 8"W x 6"H
Item Type Name	Johnson Controls
Item Weight	16 ounces
Manufacturer	Johnson Controls Inc
Manufacturer Part Number	CECOMINOD078043
Material Type	Liquid-filled sensing element
Model Name	A19ABA-40C
Model Number	A19ABA-40C
Mounting Type	Wall Mount
Power Source	Corded Electric
Product Dimensions	30"D x 8"W x 6"H
Product Style	Compact
Shape	rectangular prism
Special Feature	Liquid-Filled Sensing Elements, Variety of Sensing Element Styles
Temperature Control Type	Manual
Unit Count	1.0 Count
Voltage	277 Volts

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S$207

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to SINGAPORE.

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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