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Fig. 1—T921 approximate installation dimen-
sions in in. [mm].
ACCESSORY ADAPTER PLATE (127246A) FOR
MOUNTING ON HORIZONTAL CONDUIT BOX
HORIZONTAL CONDUIT BOX
1
3
[78]
16
5
3
[84]
16
3
3
[86]
8
5
5
[135]
16
TABLE 1—ACCESSORY FACEPLATE.
Scale
56 to 84 F [13 to 29 C]
13 to 29 C [56 to 84 F]
42 to 75 F [5 to 24 C]
66 to 95 F [19 to 35 C]
56 to 84 F [13 to 29 C]
a
Blank faceplate.
REPLACEMENT PART:
130224 Locking Cover Knob.
OPTIONAL SPECIFICATION (USING THE T991B):
Alternate proportional control similar to the T921A, but
uses an outdoor temperature, automatic control point
reset.
T991B with 3-1/2: 1 reset and 50 to 120 F [10 to
49 C] temperature setting scale (when the outdoor
bulb is at 60 F [16 C]).
DIMENSIONS:
Refer to Fig. 2.
ACCESSORIES:
Compression fittings, immersion wells: Refer to the
appropriate specification or the TRADELINE
log.
314439 Mounting Clips: For mounting a capillary tub-
ing (averaging element) in a duct.
SETTING
ADJUSTMENT
KNOB
FOR VERTICAL
CONDUIT BOX (2)
3
5
5
7
8
8
5
3
[137]
[194]
16
[84]
11
5
16
[145]
1
1
2
[57]
4
2-11/16 [69] INCHES FOR
1
T921F, G MODELS.
M9107
Part No.
135135A
135135B
135135C
135135D
a
135135C
®
Cata-
7640HX Averaging Element Mounting Kit: For mount-
ing in existing installations where access to the duct
is impractical.
Q615A Enclosure: To protect the device when mounted
outside; splash proof.
801534 Calibration Wrench.
107324A Bulb Holder: For mounting the bulb in a duct.
34886A Outdoor Bulb Shield: To protect the outdoor
bulb mounting.
Fig. 2—T991B approximate installation
dimensions in in. [mm].
15
16
[24]
2 [51]
3
[10]
8
3
1
4
[45]
3
4
16
[106]
7
32 [6]
DIAMETER (3)
15
16
3
[24]
8
DIAMETER
1
1
4
[32]
1
OUTDOOR BULB SIZE VARIES INVERSELY WITH THE RESET RATIO.
2
INDOOR BULB LENGTH AND DIAMETER IS 4-1/2 [114] INCH BY
1/2 [13] INCH EXCEPT FOR THE AVERAGING ELEMENT WHICH IS
1/8 [3] INCH DIAMETER BY 12 FT. [3 M] LONG.
3
CLEARANCE NECESSARY TO REMOVE COVER.
3
T921A,B,E-G
SPECIFICATIONS
KNOCKOUT FOR 1/2 INCH
CONDUIT (BOTH ENDS)
3
1
4
[108]
4
1
2
[57]
4
1
2
[57]
8
5
5
8
[143]
[10]
1
2
60-2242—2
M9108
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