Installation Instructions
Duct Pressure Powered, Wall-Mounted Thermostat for use with
System-Powered 35BB,BC; 37AG,AH,AJ; 37CL,CM,CN and 37HS Air Terminals
GENERAL
Thermostat Type —
Wall thermostats are designated
as direct acting (DA) and reverse acting (RA). A DA ther-
mostat will output an increasing pressure to the volume con-
trol as the sensed temperature rises. An RA thermostat will
output a decreasing pressure to the volume control as the
sensed temperature rises.
Thermostat Packages — There are 3 wall thermo-
stat packages available, each complete with decorative cover.
The dual thermostat has both an RA and a DA thermostat
mechanism in a single case with cover. Refer to Fig. 1 for
location of identification label. Wall thermostats can be ap-
plied as shown in Table 1.
Interconnecting tubing must be ordered separately. The maxi-
mum amount of tubing allowed between volume controller
and thermostat is 100 ft of
1
⁄
4
-in. OD FR (fire retardant) tub-
ing. This tubing is available in 250-ft rolls (Carrier Package
No. 35BB900172).
The dual RA/DA thermostat is designed for use in air sys-
tems which deliver both cooling air and heating air (37CL,C-
M,CN and 37HS). A special changeover valve must be used
in this application. Package No. 37CM900152, containing
the changeover valve and installation instructions, must be
ordered separately.
LOCATION
The wall thermostat must be located properly for satis-
factory control. The thermostat must be installed where it
will be exposed to free air circulation but will not be ex-
posed to drafts. Do not install thermostat on exterior walls,
in direct sunlight, or where it will be affected by lamps, com-
puters or other heat producing appliances, or people. Locate
the thermostat 4 to 5 ft above the floor. Ensure there are no
hot or cold water pipes or ducts behind the thermostat.
INSTALLATION
1. The thermostat mounts into a standard, field-supplied 2-in.
x 4-in. electrical junction box. Two #6-32 screws are pro-
vided with the thermostat. A 10-in. long piece of
5
⁄
32
-in.
ID Tygon tubing with an adaptor fitting to
1
⁄
4
-in. OD FR
tubing is also provided. (Two tube/adaptors are supplied
with the dual RA/DA thermostat.)
2. Remove the cover of the thermostat by carefully depress-
ing the wire clip on each side of the case. See Fig. 1.
Table1—WallThermostat Applications
UNIT MODE THERMOSTAT TYPE PART NO. PACKAGE NO.
35BB,BC*
Cooling RA HL08TE005 37CM901002
37AG,AH,AJ*
37CL,CM,CN
Cooling DA HL08TE006 37CM901012
Heating RA HL08TE005 37CM901002
Cooling/Heating Dual RA/DA HL08TE004 37CM900992
37HS
Cooling DA HL08TE006 37CM901012
Heating RA HL08TE005 37CM901002
Cooling/Heating Dual RA/DA HL08TE004 37CM900992
*35BB,BC and 37AG,AH,AJ applications must be used with an amplifying regulator or amplifier tee. Consult Carrier dealer for package number.
NOTE: These thermostats will only modulate the system-powered air valve in the controlled unit and interconnected slave units. A separate control
will be needed for any auxiliary equipment.
Fig.1—WallThermostat Dimensions (RA Thermostat Shown)
35BB,BC
37AG,AH,AJ
37HS, 37CL,CM,CN
Accessory Wall Thermostat
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 3
Tab 6a
PC 201 Catalog No. 533-715 Printed in U.S.A. Form 37HS-5SI Pg 1 7-91 Replaces: 37C-5SI
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