Unit Startup; Thermostat - Trane BCHE Installation, Operation And Maintenance Manual

Start-Up

Unit Startup

Thermostat

The high voltage thermostat can be used for two pipe or
four pipe systems. It can control heat only, cool only or heat
and cool systems. A pipe sensor can be used for two pipe
systems to verify the system is operating or automatically
change to the correct operating mode. The thermostat is
configurable for all unit ventilator systems. The
configuration setup is used to match the thermostat to the
system and turn on the features that wanted to be utilized.
Thermostat Operation
The thermostat only has auto fan function. Auto Fan mode
will automatically adjust the fan speed (Low, Medium, High)
based on the set point and room temperature. The more
the room temperature is from the set point the faster the fan
will operate. The fan will be off in OFF mode.
Configuration Mode
The configuration mode is used to set the thermostat to
match your heating/cooling system, refer to
103.
To configure the thermostat perform the following steps:
1. Verify the thermostat is in the OFF mode. Press the
SYS (left) button until off mode displays.
2. Press the PROG/CONFIG button for 5 seconds while
the thermostat is in OFF mode.
3. Press the up or down button to change settings within
each screen.
4. Press the PROG/CONFIG button to advance to the
next screen.
Note: Pressing the SYS button will return you to the
previous screen.
5. Press the PROG/CONFIG switch for 5 seconds to exit
configuration mode.
Configuration Mode Settings
1–System
Select the type of operation you require.
1. Heat Only is for a system with only heating.
2. Cool Only is for a system with only cooling.
3. 2-Pipe Seasonal Changeover is for a 2 pipe system
that handles both heating and cooling. The thermostat
selects whether the system will be set to heat or set to
cool based on the pipe sensor temperature.
4. 2-Pipe Manual Changeover with Auxiliary is for a 2 pipe
system that handles both heating and cooling. The user
selects whether the system will be set to heat or set to
cool. If set to heat and the pipe sensor indicates there
is not heat, the auxiliary output will be turned on.
5. 4-Pipe Auto Changeover is for a 4 pipe system. The
user selects whether the system will be set to heat,
cool, heat & cool or off.
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2 – Temperature Scale
This thermostat can function in Fahrenheit and Celsius.
F = Fahrenheit (Default)
C = Celsius
3 – Valve Type
This thermostat operates with Normally Open or Normally
Closed valves. Select the correct valve type for your
system.
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4 – Temperature Sensor
Figure 99, p.
Select the type of room temperature sensor you are using.
o = On board temperature sensor (Default)
r = Remote temperature sensor
6 – Pipe Sensor (Y/N) (for 2 pipe system only)
Select whether you are using a pipe sensor to monitor the
pipe temperature.
n = No Pipe Sensor Connected
y = Pipe Sensor Connected (Default)
7 – Pipe Sensor Cooling
Pipe temperature below this setting is considered to be
cooling. If pipe sensor temperature is above this selected
temperature for more than the Pipe Sensor Delay Time the
cool valve will be turned off.
Changes setting between 50ºF and 65ºF (10.0ºC and
18.0ºC) Default: 60
8 – Pipe Sensor Heating
Pipe temperature above this setting is considered to be
heating. If pipe sensor temperature is below this selected
temperature for more than the Pipe Sensor Delay Time the
heat valve will be turned off.
Changes setting between 70ºF and 90ºF (21.0ºC and
32.0ºC) Default: 80
9 – Pipe Sensor Delay Time
This is the time that the valve will be open to verify the pipe
temperature before the valve is turned off. This gives time
for circulation through the system.
Changes setting between 0 and 5 minutes at 1 minute
intervals Default: 5
10 – 1st-Stage Differential
Differential is the number of degrees between the set point
temperature and the turn on temperature.
"1" Heat only
"2" Cool only
"4" 2-pipe seasonal changeover
no = Normally Open (Default)
nc = Normally Closed
"5" 2-pipe seasonal changeover w auxiliary
"6" 4-pipe manual changeover
"7" 4-pipe auto changeover (Default)
BCX-SVX002A-EN