Pre-Start
RT-SVX23M-EN
39
Test Modes
There are three methods in which the “Test” mode can be
cycled at LTB-Test 1 and LTB-Test 2.
•
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.
•
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.
•
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 9, p. 39
.
Table 9.
Service test guide for component operation
Test Step
Mode
Fan
Econ
(a)
Comp1
Comp 2
Heat 1
Heat 2
Ohms
Multi-Speed Fan
Output
1
Fan
On
Minimum
Position
Setpoint 0%
Off
Off
Off
Off
2.2K
Low
Minimum
Ventilation
On
Selectable
Off
Off
Off
Off
2
Economizer Test
Open
On
Open
Off
Off
Off
Off
3.3K
Low
3
Cool Stage 1
On
Minimum
Position
On
(b)
Off
Off
Off
4.7K
Low
4
(c)
Cool Stage 2
On
Minimum
Position
On
(b)
On Off
Off
6.8K
High (2-step cooling)
Low (2-step cooling)
5
(c)
Reheat
On
Minimum
On
On
Off
Off
33K
High
6
(c)
Heat Stage 1
On
Minimum
Off
Off
On
Off
10K
High
7
(c)
Heat Stage 2
On
Minimum
Off
Off
On
On
15K
High
(a) The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan setpoint.
(b) The condenser fans will operate any time a compressor is “On” providing the outdoor air temperatures are within the operating values.
(c) Steps for optional accessories and non-applicable modes in unit will be skipped.
Table 10. Heat Pump with Constant Volume Fan Control
Test Step
Mode
C1
C2
CFA
CFB
Heat 1 Heat 2 SOV1 Econ
(a)
S Fan
CV Fan
Speed
Command
1
Fan On
Off
Off
Off
Off
Off
Off
Off
Min.
On
Min Speed
2
Econ
Off
Off
Off
Off
Off
Off
On
100%
On
Min Speed
3
Cool 1
On
Off
Norm
(b)
Norm
(b)
Off
Off
On
Min.
On
57% or 70%
(c)
4
Cool 2
On
On
Norm
(b)
Norm
(b)
Off
Off
On
Min.
On
82% or 100%
(c)
5
Heat 1
On
Off
Off
On
Off
Off
Off
Min.
On
100%
6
Heat 2
On
On
Off
On
Off
Off
Off
Min.
On
100%
7
Heat 3
On/Off
(d)
On/Off
(d)
Off
On/Off
(d)
On
Off
Off
Min.
On
100%
8
Heat 4
On/Off
(d)
On/Off
(d)
Off
On/Off
(d)
On
On
Off
Min.
On
100%
9
Defrost
On
On
Off
Off
On
Off
On
Min.
On
100%
10
Em Heat
Off
Off
Off
Off
On
On
Off
Min.
On
100%
(a) If installed
(b) Normal condenser fan staging shall remain in effect during Service Test mode
(c) Dependent on the short run timer
(d) Dependent on auxiliary heat being electric heat (On) or gas heat (Off)
Содержание Precedent WSC072E
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