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A28 Series
Two Stage Temperature Control
Description
The A28 Series are two stage temperature controls that
incorporate a liquid filled sensing element.
Applications
Use for temperature sensing applications requiring two-stage
control of HVAC/Refrigeration equipment.
Features
- wide temperature ranges available
- constant differential throughout the entire range
- SPDT snap acting switches
- unaffected by changes in barometric pressure
- unaffected by cross ambient conditions
- compact enclosure
- variety of sensing element styles
Replacement Parts
|
Code Number |
Description |
|
CVR28A-617R |
Concealed adjustment cover |
|
CVR28A-618R |
Visible scale cover |
|
KNB20A-602R |
Replacement Knob Kit |
Accessories
- packing nut assembly available for direct immersion
applications, Part No. FTG13A-600R.
- remote bulb models include 5/8 in. mounting clip.
Technical Specifications
Maximum bulb temperature of A28AA-37 is 230°F (110°C).
For all others, maximum bulb temperature is 140°F (60°C).
Electrical Ratings
|
Motor Ratings VAC |
120 |
208 |
240 |
277 |
|
A28AA, A |
|
AC Full Load Amp |
16.0 |
9.2 |
8.0 |
- |
|
AC Locked Rotor Amp |
96.0 |
55.2 |
48.0 |
- |
|
Non-Inductive or Resistance Load Amps |
16.0 |
9.2 |
8.0 |
7.2 |
|
Pilot Duty - 125 VA, 24 to 277VAC1 |
|
Motor Ratings VAC |
120 |
208 |
240 |
277 |
|
A28AJ |
|
AC Full Load Amp |
6.0 |
3.4 |
3.0 |
- |
|
AC Locked Rotor Amp |
36.0 |
20.4 |
18.0 |
- |
|
Non-Inductive or Resistance Load Amps |
15.0 |
9.2 |
8.0 |
7.2 |
|
Pilot Duty - 125 VA, 24 to 277VAC1 |
|
Motor Ratings VAC |
120 |
208 |
240 |
277 |
|
A28AB |
|
AC Full Load Amp |
16.0 |
9.2 |
8.0 |
- |
|
AC Locked Rotor Amp |
96.0 |
55.2 |
48.0 |
- |
|
Non-Inductive or Resistance Load Amps |
16.0 |
9.2 |
8.0 |
7.2 |
|
Pilot Duty - 125 VA, 24 to 277VAC1 |
1. When used as two circuit
control, the total connected load must not exceed 2000VA.
Selection Chart
|
Code Number |
Switch Action |
Range |
Diff F (C) |
Bulb and Capillary |
Bulb Well No. (order separately) |
Range Adjuster |
|
Coiled Bulb - Fixed Differential |
|
A28AA-4C |
2-SPDT |
30 to 110
(-1 to 43) |
3 1/2 (1.9) Ea. Stage 3
(1.7) Fixed Between Stages |
1 3/8 in. x 2 1/4 in. Coiled |
- |
Convertible |
|
Case Compensated - Fixed Differential |
|
A28AA-9C |
2-SPDT |
20 to 80
(-7 to 27) |
3 1/2 (1.9) Ea. Stage 3
(1.7) Fixed Between Stages |
3/8 in. x 5 in. 6 ft. Cap1 |
WEL14A-603R |
Knob |
|
Wide Range - Adjustable Interstage Differential |
|
A28AA-28C |
2-SPDT |
30 to 110
(-1 to 43) |
3 1/2 (1.9) Ea. Stage 2 to
7 Adj. Between Stages |
12 ft. Averaging Bulb 6 ft. Cap |
- |
Screwdriver slot |
|
A28AA-29C |
2-SPDT |
-30 to 100 (-34 to 38) |
5 (2.8) Ea. Stage 2 to 7
Adj. Between Stages |
3/8 in. x 4 in. 8ft. Cap1 |
WEL14A-602R |
Convertible |
|
A28AA-36C |
2-SPDT |
40 to 90 (4 to 32) |
3 Ea. Stage 2 to 7 Adj.
Between Stages |
3/8 in. x 5-3/4 in. 6ft. Cap |
- |
Knob |
|
A28AA-37C |
2-SPDT |
60 to 140 (16 to 60) |
5 Ea. Stage 2 to 7 Adj.
Between Stages |
3/8 in. x 4 in. 6ft. Cap |
WEL14A-602R |
Knob |
|
A28AJ-4C |
2-SPDT |
20 to 80 (-7 to 27) |
2 Ea. Stage 2 to 7 Adj.
Between Stages |
3/16 in. x 22 in. 6 ft. Cap |
- |
Knob |
|
Changeover Control |
|
A28AB-1C |
2-SPDT2 |
20 to 80
(-7 to 27) |
3 1/2 (1.9) |
3/8 in. x 5 in. 6ft. Cap |
WEL14A-603R |
Screwdriver slot |
|
A28AB-2C3 |
2-SPDT4 |
60 to 90 (16 to 32) |
5 (2.8) |
Strap-on Grid Bulb 42 in. Cap |
- |
Screwdriver slot |
1. Packing nut assembly
available for direct immersion applications (Part No. FTG13A-600R)
2. Switches within 1°F (0.6°C)
of each other.
3. Maximum sensing element
temperature is 250°F (121°C).
4. Switches within 1.5°F
(0.9°C) of each other.
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