Johnson Controls A28MA-1C, A28MA-2C Data Sheet

A28MA Temperature Control

Multi-Stage Electromechanical Temperature Controls

A28 Two-Stage Temperature Control with Weatherproof Enclosure

Description

The A28MA Controls are wide range
temperature controls with rainproof NEMA 3R
enclosure and two single-pole, double-throw
(SPDT) switches.

Refer to the A28MA Type Two-Stage Tower

Fan Control Two-Stage Air Cooled
Condenser Fan Control Product Bulletin

(LIT-125135) for important product application

information

Technical Specifications

Electrical Ratings

Motor Ratings 120 208 240

AC Full Load A 16.0 9.2 8.0
AC Locked Rotor A 96.0 55.2 48.0

Non-Inductive or
Resistance Load A
(Not Lamp Loads)

Pilot Duty 125 VA, 24 to 277 VAC

Note: When used as a two-circuit control, the
total connected load must not exceed
2,000 VA.

16.0 9.2 8.0

Code No. LIT-1927125

Features

• rugged steel enclosure

• liquid-filled sensing element provides
uniform control

Applications

• sump water temperature control for cooling
towers and evaporative condensers

• fan cycling control for air-cooled
condensers

Repair Information

If the A28 Two-Stage Temperature Control with
Weatherproof Enclosure fails to operate within
its specifications, replace the unit. For a
replacement control, contact the nearest
Johnson

Controls®

representative.

Selection Chart

Product
Code
Number

A28MA-1C

A28MA-2C 3/8 in. x 4-1/16 in.; 6 ft capillary

Switch
Action

Two-Stage
Two-SPDT
Switches

Range
°F (°C)

40 to 120
(4 to 49)

Differential
F° (C°)

Factory set
5 (2.8) each stage
8 (4.4) between stages

Bulb and
Capillary

3/8 in. x 4 in.;
Neoprene-coated 6 ft capillary

Range
Adjuster

Screwdriver
slot

The performance specifications are nomina l and con form to accep table ind ustry stand ards. For applicati ons at con ditions be yond these specification s, consult th
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc.

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