Honeywell TRADELINE Q7300L Installation Instructions Manual page 4

Q7300L SERIES 2000 COMMERCIAL THERMOSTAT SUBBASE
WIRING SUBBASE
All wiring must comply with local electrical codes and ordinances. Follow equipment manufacturer wiring instructions when
available. Refer to Fig. 9 and 10 for typical hookups. A letter code is located near each terminal for identification. See
Table 3 for terminal descriptions and system action.
Standard Terminal
Designations
A1, A2
BM
C1, C2, C3, C4, C5
FC
GH
GL
P1, P2
R
RM
T, T
X
Y
CAUTION
Disconnect power before wiring to prevent
electrical shock or equipment damage.
1. Loosen the terminal screws on the subbase and
connect the system wires. See Fig. 8.
IMPORTANT
Use 18-gauge, solid-conductor color-coded
thermostat cable for proper wiring. If using 18-
gauge stranded wire, no more than ten wires can
be used. Do not use larger than 18-gauge wire.
2. Securely tighten each terminal screw.
3. Push excess wire back into the hole.
4. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
NOTE: After wiring, check that all connections are tight
and secure. See Fig. 8. Loose or intermittent wire
connections cause inconsistent system operation.
62-0131—2
Table 3. Terminal Descriptions and Conditions.
Typical Connection
Damper Control Relay.
ML7984 Actuator connection. No call for heat, valve
closed during occupied periods and open during
unoccupied periods.
Communication input for T7147.
Fan control Transformer.
High speed fan output. Activated during calls for cooling.
Low speed fan output. Activated on calls for heat and
fan On selection.
Pump Interlock Relay. Operates circulator pump in
hydronic heat or energizes conventional heat system.
24V System Transformer
ML7984 Actuator connection. No call for heat, valve
closed. Call for stage 1 heat, valve approximately one-
half open. Call for stage 2 heat, valve fully open.
Remote sensor input for T7047 or T7147.
Heating transformer common
Cool call
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
Fig. 8. Proper wiring technique.
4
Function Terminal Type
input, output 24V powered
output
—
input
output 24V powered
output 24V powered
input, output 24V powered
input
—
—
input
24V output on Y
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
M4826
contact
—
—
—
contact
contact
contact
—
—
—
—
—