The Q7300L Thermostat Subbase is used with the
T7300D,F Thermostat to provide electronic control of
commercial 24 Vac single zone HVAC equipment. The
T7300/Q7300L is designed for heat-cool applications using
a valve and valve actuator combination for hydronic
heating. See Table 1. It can also be used to control single-
stage conventional heating systems. It provides two-speed
fan control. Terminals are provided for the T7047 Remote
Sensor or the T7147 Remote Sensor and Override
Module. LEDs on the thermostat are prewired and labeled
to indicate heat and cool operation. See Fig. 9 and 10 for
hookup drawings. Refer to form 63-4355 for installation
and operation of the T7300/Q7300.
Table 1. Valve and Valve Actuator Combinations.
The valve will not close if the wrong valve and
valve actuator combination is used.
20 to 30 Vac, 50/60 Hz.
System Current :
6 VA maximum at 30 Vac, 50 or 60 Hz.
Output Relay Current:
See Table 2.
® U.S. Registered Trademark
Copyright © 1996 Honeywell Inc. •
Valve Actuator Model
• All Rights Reserved
Series 2000 Commercial
Table 2. Maximum Amps at 30 Vac.
Operating Ambient: 40°F to 110°F (4°C to 43°C).
Shipping: -30°F to +150°F (-34°C to +65°C).
Range: 45°F to 95°F (7°C to 35°C).
Differential: 2°F (1°C).
5% to 90% RH, noncondensing.
If this control is replacing a control that contains
mercury in a sealed tube, do n
control in the trash
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old thermostat.
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause a
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
3. Installer must be a trained, experienced service
4. After completing installation, use these instructions
to check out the product operation.
place your old