System Start-up
RT-SVX35H-EN 75
Example: If the voltage readings of the supply power
measured 221, 230, and 227, the average volts would be:
The percentage of Imbalance equals:
The 2.2% imbalance in this example exceeds the
maximum allowable imbalance of 2.0%. This much
imbalance between phases can equal as much as a 20%
current imbalance with a resulting increase in motor
winding temperatures that will decrease mot
or life. If the
v
oltage imbalance is over 2%, notify the proper agencies
to correct the voltage problem before operating this
equipment.
221 + 230 + 227 = 226 Avg.
3
VD (reading farthest from average) = 221
100 X 226 - 221 = 2.2%
226
Table 20. Service test guide for component operation
COMPONENT
BEING TESTED
COMPONENT CONFIGURATION
Occ
Unocc
Relay
(a)
Supply
Fan
Exhaust
Fan
Heat Stages
Econo
Damper
Exhaust
Damper
VFD
Output1 2 3
SUPPLY FAN*
On Off Off Off Off Closed Closed 100% Unocc
EXHAUST FAN
Off On Off Off Off Closed
100%
Open
100% Default
GAS HEAT (Full Cap.)
On Off On On N/A Closed Closed 100% Unocc
Stage 1 On Off On Off N/A Closed Closed 100% Unocc
Stage 2 On Off Off On N/A Closed Closed 100% Unocc
Full Modulating
(For High Fire Adjustment)
On Off
90%
Select
Closed Closed 100% Unocc
Full Modulating
(For Low Fire Adjustment)
On Off 5% Select Closed Closed 100% Unocc
Limited Modulating
(For High Fire Adjustment)
On Off
90%
Select
Closed Closed 100% Unocc
Limited Modulating
(For Low Fire Adjustment)
On Off
33%
Select
Closed Closed 100% Unocc
ELECT HEAT (Full Cap.)
On Off On On On Closed Closed 100% Unocc
Stage 1 On Off On Off Off Closed Closed 100% Unocc
Stage 2 On Off Off On Off Closed Closed 100% Unocc
Stage 3 On Off Off Off On Closed Closed 100% Unocc
Modulating
Hydronic Heat
Off Off
100%
Select
Closed Closed 0% Default
Pre - Heater
Off Off On N/A N/A Closed Closed 0% Default
Fresh Air Dampers
Off Off Off Off Off
100%
Open
Closed 0% Default
Exhaust Dampers
Off Off Off Off Off 100%
100%
Open
0% Default
(a) RTM OCC/UNOCC output in the Service Test Mode must be in the unoccupied mode to open the system VAV boxes or
to drive the VFD to 100%.
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