Test Modes; Reliatel™ Controls - Trane Precedent YZC036E Installation, Operation And Maintenance Manual

Pre-Start
Table 9. Service test guide for component operation
Test
Mode Fan
Step
Fan On
1
Minimum
On
Ventilation
Economizer
2 On
Test Open
Cool
3 On
Stage 1
Cool
(e)
4 On
Stage 2
Cool
(e)
5 On
Stage 3
(e)
6 Reheat On
Heat
(e) (g)
7 On
Stage 1
Heat
(e)
8 On
Stage 2
(a) The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan setpoint.
(b) The supply fan output is in reference to the user selected maximum unit fan speed.
(c) Regardless of the economizer mode configuration, the unit will run the supply fan at the minimum speed during the economizer step of the service test.
(d) The condenser fans will operate any time a compressor is 'On' providing the outdoor air temperatures are within the operating values.
(e) Steps for optional accessories and non-applicable modes in unit will be skipped.
(f) Units with enhanced dehumidification only will not perform this step during service test.
(g) For ultra Low NOX gas furnace units, the vestibule temperature limit switch must also be in closed state in order for the gas valve and the premix blower
to be energized for Heat Stage 1.
(h) Supply fan output for modulating gas heat will be a percentage of the user selected maximum supply fan speed. Values shown represent SZVAV/MZVAV.

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 startup 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
startup 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
startup 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.
42
(a)
Econ Comp 1 Comp 2
Minimum
Position Off Off
Setpoint 0%
Selectable Off Off
Open Off Off
Minimum
(d)
On Off
Position
Minimum
(d)
On On
Position
Minimum
(d)
On On
Position
Minimum On On
Minimum Off Off
Minimum Off Off
Modulating
Heat 1 Heat 2
Off Off
Off Off
Off Off
Off Off
(d)
Off Off
(d)
Off Off
Off Off
(h)
On/50% Off
On/
On
(h)
100%
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
ReliaTel™ Controls
Upon power initialization, the Gas Ignition Module (IGN)
performs self-diagnostic checks to insure that all internal
controls are functional. It also checks the configuration
parameters against the components connected to the
system. The System LED located on the IGN module is
turned "On" within one second of power-up if internal
operation is okay.
Supply Fan Output
Cool and
Resistance
Heat
Staged
Heat
0%
Ω
2.2K
0%
Ω
0% 3.3K
Ω
0% 4.7K
Ω
0% 6.8K
Ω
0% 8.2K
Ω
0% 33K 100%
Ω
50% 10K 100%
Ω
100% 15K 100%
(b)
Modulating
Heat
50%
(c)
50%
82%
100%
100%
(f)
—
(h)
50%
(h)
100%
Table 9, p. 42.
RT-SVX46G-EN