Submittal Sheet

TR21, TR22, TR23, AND TR24 WALL MODULES
63-1321ES—04 2
Accessories: 50007298-001 (pack of 12) medium, cover
plate; 6-7/8 x 5 in. (175 x 127 mm).
Approvals:
CE; UL94 plastic enclosure; FCC Part 15, Class B
Temperature Sensor
TR21, TR22, TR23, and TR24 20K Ohm Non-linearized
Sensor:
All models are furnished with a 20K Ohm non-linear NTC
temperature sensor that follows a specific temperature
resistance curve. See Fig. 1.
Honeywell controllers used with the TR21, TR22, TR23, and
TR24 models employ an algorithm that provides readings
close to the actual temperature. Sensor accuracy across the
range of 55°F to 85°F (13°C to 29°C) is better than ±0.36°F
(±0.2°C).
NOTE: The TR21-A wall module model has two 20K Ohm
non-linear NTC temperature sensors in parallel,
which provide 10K NTC temperature sensing
necessary for averaging.
Fig. 1. Temperature vs. resistance for nonlinear sensor.
Wall Module Features
Table 1 illustrates the TR21, TR22, TR23, and TR24 wall
module features and lists the existing Honeywell models that
they replace.
NOTE: Refer to the TR21, TR22, TR23, and TR24 Wall Modules – Installation Instructions, form 62-0267, for wiring diagrams.
Some features may not be available with all controllers.
TEMPERATURE (DEGREES)
o
F
30
40 50 60 70
80
90
100
110
0
10
20
30
40
RESISTANCE (OHMS)
20K OHM AT
77
o
F (25
o
C)
80K
70K
60K
50K
40K
30K
20K
10K
o
C
M5874
A
Table 1. TR21-TR24 Wall Module Features.
a
a
A check mark (9) indicates the feature is included with the wall module.
Model Number
Sensor Element
Type
Sensor Type Selectable Setpoint
Adjustment:
55°F to 85°F,
13°C to 30°C, or
Relative (- to +)
Override
Button
with LED
LON
Jack
Fan
Switching
Honeywell
Wall Module
Model
Replaces
Honeywell
Model Temp Humidity
TR21 T7770A1006 20K ohms
non-linear
9
n/a
TR21-A T7770A3002 10K ohms
non-linear
for averaging only
9
TR21-H n/a
20K ohms
non-linear
99 9
TR21-J T7770A2004 9
9
TR22 T7770B1004
T7770B1020
T7770B1046
9
9 9
TR23 T7770C1002
T7770C1028
T7770C1044
9
999
TR23-H n/a 99999
TR23-N
b
b
The TR23-N has no Honeywell logo on the cover.
T7770C1051 9
999
T24 T7770D1000 9
99
TR22-F5 n/a 9
9 9 5 position
TR23-F3 T7770E1023 9
9993 position
TR23-F5 T7770F1005 9
9995 position