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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
2. Resistance Test Mode - This method can be used for start-up providing a decade box for variable
3. Auto Test Mode - This method is not recommended for start-up due to the short timing between
For unit test steps, test modes, and step resistance values to cycle the various components, refer
to
Table 6.
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Verifying Proper Air Flow
(Units with Belt Drive Indoor Fan)
Much of the systems performance and reliability is closely associated with, and dependent upon
having the proper airflow supplied both to the space that is being conditioned and across the
evaporator coil.
The indoor fan speed is changed by opening or closing the adjustable motor sheave.
RT-SVX25C-EN
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.
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.
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.
Table
6.
Service test guide for component operation
TEST
STEP
MODE
Fan
Fan
On
1
Minimum
On
Ventilation
Economizer
2
On
Test Open
3
Cool Stage 1
On
(c)
4
Cool Stage 2
On
(f)
5
Reheat
On
(g)
6
Heat Stage 1
On
(h)
7
HeatStage 2
On
The exhaust fan will turn on anytime the economizer damper position is equal
The condenser fans will operate any time a compressor is "On"
Steps for optional accessories and non-applicable modes in unit will be skipped.
The condenser fans will operate any time a compressor is "On"
The condenser fans will operate any time a compressor is "On"
Steps for optional accessories and non-applicable modes in unit will be skipped.
Steps for optional accessories and non-applicable modes in unit will be skipped.
Steps for optional accessories and non-applicable modes in unit will be skipped.
(a)
Econ
Comp 1 Comp 2 Heat 1 Heat 2 Ohms
Minimum
Position
Off
Off
Setpoint
0%
Selectable
Off
Off
Open
Off
Off
Minimum
(b)
On
Off
Position
Minimum
(d)
(e)
On
On
Position
Minimum
On
On
Minimum
Off
Off
Minimum
Off
Off
Off
Off
2.2K
Off
Off
Off
Off
3.3K
Off
Off
4.7K
Off
Off
6.8K
Off
Off
33K
On
Off
10K
On
On
15K
37
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