User Guide

TStatSpec
TM
28
and three stages of cooling. The fourth stage of cooling is
available for selection as long as the 0/1/2 heat stages are
selected. When the fourth stage of cooling is selected, the
third stage of heating is no longer available.
When the model is selected as T7350M, Mod & T7350H,
Mod, Com, user can configure for 0/1/2 heat or cool stages.
The modulating outputs are always active and being driven 0-
100%. When the number of stages are 0, the relay outputs are
used to enable the heating or cooling outputs. Staged action
may be used in addition to the modulating outputs. The
number of stages is set to 1 or 2. It is not possible to have
both 2 stages of heating and cooling.
Examples:
Example 1: Selecting heating stages and cooling stages as 1
configures for modulating heat and modulating cool action.
Example 2: To have Mod heat, heating pump enable relay
and 1 stage of heating, configure Heat Stages as Heat
Enable, Heat Action (depends on the actuator connected) and
connect the relay W1 such that it turns the heating pump ON
or OFF.
AUXILIARY DO:
This option allows the user to configure the auxiliary outputs.
The auxiliary DO can be configured for econimizer, Time Of
Day or for dehumidification. The dehumidification options
available are Simple Dehumid or Dehumid Hotgas BP.
Note: The dehumid options (Simple Dehumid or Dehumid
Hotgas BP) are available for configuration only if a humidity
sensor is configured.
HEAT ACTION:
This is enabled when the model is selected as T7350M, Mod
or T7350H, Mod, Com. This is disabled for other models. This
is applicable for modulating heat output that is when the Heat
Stages option is configured as Heat Enable. Select 'Direct 4-
20mA' if the actuator connected for heating action is driven
from 0-100% and 'Reverse 20-4mA' if is driven from 100-0%.
COOL ACTION:
This is enabled when the model is selected as T7350M, Mod
or T7350H, Mod, Com. This is disabled for other models. This
is applicable for modulating cool output that is when the Cool
Stages option is configured as Cool Enable. Select 'Direct 4-
20mA' if the actuator connected for cooling action is driven
from 0-100% and 'Reverse 20-4mA' if is driven from 100-0%.
INPUTS:
This section allows the user to configure the inputs to the
thermostat.
ROOM TEMP:
This option allows the user to configure the source of room
temperature input to the thermostat. The T7350 thermostat is
equipped with its own internal room temperature sensor. The
sensor operating range is 30 deg F to 110 deg F.
The T7350 thermostat is compatible with the following
Honeywell Wall Modules: T7770A1006, T7770B1046,
T7770C1044, T7770D1000, TR21, TR22, TR23, TR24 and
T7771.
Options available are:
• Local: Configure as local if the internal temperature sensor
on the thermostat is to be used to sense the room
temperature.
• T7770A/D or TR21/24: The models T7770A1006,
T7770D1000, TR21 and TR24 have only temperature
sensors, and have no setpoint knob. Select this option
when one of these families of wall modules is connected.
• T770B/C or TR22/23: The wall modules T770B1046,
T770D1000, TR22 and TR23 have temperature sensors
with setpoint knobs, override button and a LED.
• T7771: The T7771 wall module will have a temperature
sensor and override button, but instead of a setpoint knob
it has up/down buttons and 7 LEDs to indicate ( -3 deg F to
+3 deg F) what the user has selected.
NOTE:
1. Open, short or out-of-range on the internal or
remote room temperature sensor input(s) to the
thermostat will cause the outputs to be turned off.
The fault detection is done only on the sensor
being used. That is, if the internal (local) sensor is
being used, faults on the remote sensor are
ignored.
2. The T7350A, 1H1C model supports only Local
sensor.
ROOM HUMIDITY:
This allows the user to configure the source of room humidity
input to the thermostat. Options available are:
• None: Select this option when dehumidification is not
required.
• If the Aux DO output is configured as Simple Dehumid or
Dehumid Hotgas BP, it is defaulted to Time Of Day option
and the Simple Dehumid, Dehumid Hotgas BP options are
not available for selection.
• The Dehumidification High Limit and Dehumidification
Options in the Setpoints page are disabled.
• Local
: The thermostat has an internal room relative
humidity sensor, which has the range of 5% to 105%RH.
For humidity less that 5% and above 105%, the sensor will
show invalid and there will be a sensor fail alarm.
• Remote: A remote humidity sensor can be hardwired to
the thermostat. Select this option when the humidity input
is required from a remote sensor. The thermostat is
compatible to H7631A1000 (0 to 10V) or equivalent
sensors.
NOTE:
1. In cases where a humidity sensor is hardwired, a
valid value on Space Temperature In point will
take precedence over the hardwired input.
2. The T7350A, 1H1C and T7350B, 2H2C thermo-
stat models does not support a room humidity
sensor.