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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Johnson Controls - 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

$235.93

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Description

🌡️ Stay cool, stay smart — control your climate like a pro!

FLEXIBLE SETTINGS - Choose fixed or adjustable differential to tailor your environment control precisely.
ECO FRIENDLY SENSING - Advanced liquid-filled elements ensure reliable, environmentally conscious performance.
REMOTE WI FI CONTROL - Manage your thermostat effortlessly with push-button remote access for modern convenience.
VERSATILE INSTALLATION - Compact, wall-mount design fits seamlessly into any professional workspace or facility.
PRECISION TEMPERATURE CONTROL - Maintain exact climate comfort with constant differential across the full range.

The Johnson Controls A19ABA-40C is a compact, wall-mount mechanical thermostat designed for precise temperature regulation from 120 to 277 VAC. Featuring eco-friendly liquid-filled sensing elements and flexible differential settings, it offers reliable, manual control with modern Wi-Fi remote connectivity, making it ideal for professional environments seeking efficient HVAC management.

Specifications

ASIN	B003U4N74O
Additional Features	Liquid-Filled Sensing Elements, Variety of Sensing Element Styles
Best Sellers Rank	#163,352 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #80 in Thermostat Controllers
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 4.2 out of 5 stars (121)
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 Style	Compact
Shape	rectangular prism
Temperature Control Type	Manual
Unit Count	1 Count
Voltage	277 volts

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$235.93

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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