Honeywell Q674A-G User Manual
3
60-1165—6
3. Firmly tighten each terminal screw.
4. Fit wires as close as possible to the subbase. Push
4. Fit wires as close as possible to the subbase. Push
excess wire back into the hole.
5. Plug hole with nonflammable insulation to prevent
drafts from affecting the thermostat.
Fig. 5—Jumper RC and RH for single trans-
former system. Strip wire 3/4 in. [19 mm].
former system. Strip wire 3/4 in. [19 mm].
Fig. 6—Jumper adjacent terminals for special
system hookup. Strip wire 3/4 in. [19 mm].
system hookup. Strip wire 3/4 in. [19 mm].
NOTE: Only the T874D Thermostat is shown with the
subbases. This thermostat/subbase provides 2-stage heat-
ing and 2-stage cooling connections. If using another
model, see Fig. 16 and Table 4.
ing and 2-stage cooling connections. If using another
model, see Fig. 16 and Table 4.
TABLE 4—THERMOSTAT BULB
CONFIGURATOIN.
Model No.
Heating Bulbs
Cooling Bulbs
T874A
H1
C1
T874B
H1
C1,C2
T874C
H1, H2
C1
T874D
H1, H2
C1, C2
T874E
C1, C2
T874F
H1, H2
Fig. 7—For nonadjacent terminals, use jumper
supplied with subbase.
supplied with subbase.
TABLE 3—JUMPER APPLICATIONS.
If your subbase has:
Application
Use Fig.
RC, RH terminals
single transformer
5
system
adjacent terminals
special system
6
operation or LED
nonadjacent
indication
7
terminals