Ingersoll-Rand ReliaTel, Manual, Page: 73 / 176

RT-SVD03L-EN 73
Table 29. Condenser fan control data 12.5 – 17.5 tons
OAT Condition
VSPD
Comp.
Speed
Fixed Fixed 12.5 to 15 Tons 17.5 Tons
Comp 1 Comp 2
RPM
% Cond.
Airflow
VSM Duty
Cycle
RPM
% Cond.
Airflow
VSM Duty
Cycle
OAT>95F <30Hz OFF OFF 1140 100% 95% 1080 100% 90%
OAT>95F >30Hz OFF OFF 1140 100% 95% 1080 100% 90%
OAT>95F <30Hz ON OFF 1140 100% 95% 1080 100% 90%
OAT>95F >30Hz ON OFF 1140 100% 95% 1080 100% 90%
OAT>95F <30Hz ON ON 1140 100% 95% 1080 100% 90%
OAT>95F >30Hz ON ON 1140 100% 95% 1080 100% 90%
45F<OAT<90F <30Hz OFF OFF 533 45% 43% 530 45% 43%
45F<OAT<90F >30Hz OFF OFF 753 65% 62% 754 65% 62%
45F<OAT<90F <30Hz ON OFF 753 65% 62% 754 65% 62%
45F<OAT<90F >30Hz ON OFF 863 75% 71% 866 75% 72%
45F<OAT<90F <30Hz ON ON 863 75% 71% 866 75% 72%
45F<OAT<90F >30Hz ON ON 1140 100% 95% 1080 100% 90%
25F<OAT<40F <30Hz OFF OFF 309 25% 24% 303 25% 24%
25F<OAT<40F >30Hz OFF OFF 309 25% 24% 303 25% 24%
25F<OAT<40F <30Hz ON OFF 309 25% 24% 303 25% 24%
25F<OAT<40F >30Hz ON OFF 533 45% 43% 530 45% 43%
25F<OAT<40F <30Hz ON ON 533 45% 43% 530 45% 43%
25F<OAT<40F >30Hz ON ON 533 45% 43% 530 45% 43%
OAT<20F <30Hz OFF OFF 250 20% 21% 245 20% 21%
OAT<20F >30Hz OFF OFF 250 20% 21% 245 20% 21%
OAT<20F <30Hz ON OFF 309 25% 24% 303 25% 24%
OAT<20F >30Hz ON OFF 533 45% 43% 530 45% 43%
OAT<20F <30Hz ON ON 533 45% 43% 530 45% 43%
OAT<20F >30Hz ON ON 533 45% 43% 530 45% 43%
Note: A 2 Hz hysteresis around the VSPD compressor will be implemented when transitioning from a high speed to a lower speed.
Test Modes
VSPD compressor equipped units will require handling
for two test mode sequences. See below for additional
information on each mode.
Failure and Protection
Conditions
Certain failure and overriding conditions require
special handling of the VSPD compressor. Refer to the
following sections for details on each failure mode
associated with the VSPD compressor and the unit
response.
Supply Air Temperature on SZVAV
If the supply air temperature sensor value is out of
range/invalid on a unit configured for SZVAV, the unit
will fall back to traditional constant volume control and
the VSPD compressor will be controlled at 100%
capacity for all requests for compressor operation. All
startup, shutdown, and oil recovery requirements will
remain in effect for the VSPD compressor.
Outside Air Temperature
If the OA temperature sensor value is out of range/
invalid, an "Outside Air Temperature Invalid/Out of
Range" diagnostic shall be generated. Condenser fan
operation will default to 100% during all requests for
compressor operation. This will remain consistent
between single and multi-compressor configured units.
The VSPD compressor will operate as a fixed speed
compressor, being limited to 40Hz (2400 RPM) to
protect against high ambient OAT operation. The
"Outside Air Temperature Invalid/Out of Range"
diagnostic shall automatically reset if a valid value is
received by the controller.
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