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Q7300L
Series 2000 Commercial
Thermostat Subbases
INSTALLATION INSTRUCTIONS
Table 2. Maximum Amps at 30 Vac.
APPLICATION
Relay Running (A) Inrush (A)
The Q7300L Thermostat Subbase is used with the
Fan 1.6 3.5
T7300D,F Thermostat to provide electronic control of
commercial 24 Vac single zone HVAC equipment. The Heat 1.6 3.5
T7300/Q7300L is designed for heat-cool applications using
Cool 1.6 7.5
a valve and valve actuator combination for hydronic
Auxillary (Economizer) 1.6 3.5
heating. See Table
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Q7300L SERIES 2000 COMMERCIAL THERMOSTAT SUBBASE YES NO NO 5 FEET (1.5 METERS) NO M4823A Fig. 1. Typical location of thermostat or remote-mounted sensor. Do not mount the sensor(s) where it can be affected by: Location — drafts, or dead spots behind doors and in corners. Subbase without Remote-Mounted — hot or cold air from ducts. — radiant heat from sun or appliances. Temperature Sensor — concealed pipes and chimneys. Install the thermostat about 5 ft (1.5m) above the floor in — unheated (uncoo
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Q7300L SERIES 2000 COMMERCIAL THERMOSTAT SUBBASE SUBBASE SUBBASE TT TT T7047C T7047C T7047C T7047C TT TT TT TT T7047G T7047C T7047C T7047C TT T7047C TT TT TT TT T7047C T7047C T7047C M4839 TT TT TT Fig. 3. Two T7047C Sensors and one T7047G Sensor providing temperature averaging network for T7300/ Q7300 Thermostat/Subbase. M4842 SUBBASE Fig. 6. Nine T7047C Sensors providing TT temperature averaging network for T7300/Q7300 Thermostat/Subbase. T7047C T7047C TT TT Mounting Subbase The subbase mounts
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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. Table 3. Terminal Descriptions and Conditions. Standard Terminal Designations Typical Connection Function Terminal Type A1, A2 Damper Cont
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Q7300L SERIES 2000 COMMERCIAL THERMOSTAT SUBBASE Typical Wiring Hookups SUBBASE C2 C1 T T R A1 P1 RM BM A2 P2 Y X GH GL FC C5 C4 C3 AS AS 8 2 7 ML7984 9 COOLING VALVE HIGH DAMPER RELAY ACTUATOR SPEED CONTROL 3 DISCHARGE FAN RELAY AIR T5 R1 RELAY SENSOR CA5 CA4 CA3 CA2 CA1 T T 4 B3 T6 T7147 REMOTE COMFORT ADJUST MODULE LOW 5 PUMP GND SPEED INTERLOCK W FAN RELAY RELAY 6 1 L1 L1 (HOT) (HOT) L2 L2 FAN 1 TRANSFORMER TRANSFORMER 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD 6 CONNECT GND
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Q7300L SERIES 2000 COMMERCIAL THERMOSTAT SUBBASE A. ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE. Mounting Thermostat on Subbase Mount the thermostat on the subbase after the subbase is installed. 1. Engage tabs at the top of the thermostat and subbase. Fig. 11. 2. Press lower edge of case to latch. NOTE: To remove the thermostat from the wall, first pull out at the bottom of the thermo- stat; then remove the top. IMPORTANT Refer to the thermostat installation instructions for B.
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Q7300L SERIES 2000 COMMERCIAL THERMOSTAT SUBBASE OPERATION Table 4. T7300 Thermostat/Q7300L Subbase Sequence of Operation. System Fan Equipment Loads a Mode Setting Setting Call Action Energized Occupied Any Auto — Thermostat in Occupied mode. A2 Damper control relay energized. Occupied — On — Depends on last system. If cool is the last GL or GH system, then call is for high speed fan. When heat is the last system, then call is for low speed fan. Occupied Heat Auto Stage 1 heat Heat LED activate
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Q7300L SERIES 2000 COMMERCIAL THERMOSTAT SUBBASE Home and Building Control ® Home and Building Control Helping You Control Your World Honeywell Limited-Honeywell Limitée Honeywell Inc. 155 Gordon Baker Road Honeywell Plaza North York, Ontario P.O. Box 524 M2H 3N7 Minneapolis, MN 55408-0524 62-0131—2 J.H. Rev 62-0131—2 . 7-97 www.honeywell.com/building/components 8
