RT-SVX33E-EN
31
Pre-Start
Test Modes
There are three methods in which the “Test” mode can be
cycled at LTB-Test 1 and LTB-Test 2.
1.
Step Test Mode - This method initiates the different
components of the unit, one at a time, by temporarily
shorting across the two test terminals for two to three
seconds.
For the initial start-up of the unit, this method allows
the technician to cycle a component “On” and have up
to one hour to complete the check.
2. Resistance Test Mode - This method can be used for
start-up providing a decade box for variable resistance
outputs is available. This method initiates the different
components of the unit, one at a time, when a specific
resistance value is placed across the two test
terminals. The unit will remain in the specific test mode
for approximately one hour even though the
resistance is left on the test terminals.
3. Auto Test Mode - This method is not recommended for
start-up due to the short timing between individual
component steps. This method initiates the different
components of the unit, one at a time, when a jumper
is installed across the test terminals. The unit will start
the first test step and change to the next step every 30
seconds. At the end of the test mode, control of the unit
will automatically revert to the applied “System”
control method.
For unit test steps, test modes, and step resistance values
to cycle the various components, refer to
Table 7, p. 31
.
Table 7.
Service test guide for component operation
TEST STEP
MODE
Fan
Econ
2.
Comp 1
Comp 2
Heat 1
Heat 2
Ohms
1
Fan
On
Minimum Position Off
Setpoint 0%
Off
Off
Off
2.2K
Minimum Ventilation
On
Selectable
Off
Off
Off
Off
2
Economizer Test Open
On
Open
Off
Off
Off
Off
3.3K
3
Cool Stage 1
On
Minimum Position
On
1.
Off
Off
Off
4.7K
4
3.
Cool Stage 2
On
Minimum Position
On
1.
On
1.
Off
Off
6.8K
5
3.
Reheat
On
Minimum
On
On
Off
Off
33K
6
3.
Heat Stage 1
On
Minimum
Off
Off
On
Off
10K
7
3.
Heat Stage 2
On
Minimum
Off
Off
On
On
15K
Notes:
1.
The condenser fans will operate any time a compressor is "On" providing the outdoor air temperatures are within the operating values.
2.
The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan setpoint.
3.
Steps for optional accessories and non-applicable modes in unit will be skipped.
