Model Number Descriptions - 3 to 5 Tons (T/Y - 17 Plus)
RT-SVX21AC-EN 11
C = Fan Failure Switch
10
and
Condensate Drain Pan Overflow
Switch
D = Discharge Air Sensing
10
and
Condensate Drain Pan Overflow
Switch
E = Clogged Filter Switch
10
, Fan
Failure
Switch
10
and Condensate Drain Pan
Overflow Switch
F = Clogged Filter Switch
10
, Discharge
Air Sensing Tube
10
and Condensate
Drain Pan Overflow Switch
G = Fan Failure Switch
10
, Discharge Air
Sensing Tube
10
and Condensate
Drain Pan Overflow Switch
H = Clogged Filter Switch
10
,
Fan Failure Switch
10
,
Discharge Air Sensing
10
and
Condensate Drain Pan Overflow
Switch
Digit 26 — System Monitoring
Controls
0 = No Monitoring Controls
A = Demand Control Ventilation
(CO
2
)
16,17
Digit 27 — Unit Hardware
Enhancements
0 = No Enhancements
1 = Stainless Steel Drain Pan
Digit 31 — Advanced Unit Controls
0 = Standard Unit Controls
1 = Human Interface
Digit 34 - Ultra Low NOx Gas
Furnace (CA Only)
0= None
A = 14 ng/J NOx
Emissions
20,21,22,23,24,25,26
Model Number Notes
1. Manual outside air damper will
ship factory supplied within the
unit, but must be field installed.
2. High pressure control is standard
on all
units.
3. Direct drive is standard for 3 to 5
ton
variable
stage units.
Digit 15 = 0, 6
3 Phase (3-5 ton) - High Efficiency Constant
CFM
4. Economizer with Barometric
Relief is for downflow configured
units only. Order Economizer
without Barometric Relief for
horizontal configuration.
Barometric Relief for horizontal
configured units must be ordered
as field installed accessory.
5. Through the base electric
re
quired whe
n ordering
disconnect/circuit breaker
options.
6. Requires use of Disconnect or
Circuit Br
eaker.
Not Available
High Efficiency
3 to 5 ton w/Standard Indoor Motor w/460V
or 575V
7. Standard metering devices are
TXVs.
8. The return air smoke detector
m
ay not fit up or
work properly on
the Precedent units when used in
conjunction with 3rd party
accessories such as bolt on heat
wheels, economizers and power
exhaust. Do not order the return
air smoke detectors when using
this type of accessory.
9. Return Air Smoke Detector
ca
nnot be ordered with Novar
Controls.
10. These options are
standard wh
en
ordering Novar Controls.
11. Includes gas piping and shutoff
(field assembly required).
12
. Not available with high
temperature duct
sensor
accessory.
13. N
ovar Sensor utilized with
Digit 21 = (4) Novar 3051 Controls
wi
thout Zo
ne Sensor.
14. Available for T/Y 3,4,5 ton high
efficiency models.
15. Requires selection of 2” Pleated
Filters (opt
ion B or C) for
Digit 16.
16. Demand Control Ventilation not
av
ailable with electromech
anical
controls.
17. Demand Control Ventilation
Option i
ncludes wiring only. The
CO
2
sensor is a field-installed
only option.
18. Discharge Air Sensing is also
standard equipment on units
with Single Zone and Supply Air
Temperature Control VAV.
19. Must be used with BACnet® open
protocol.
20. No 575V with Ultra Low NOx.
21. Ultra Low NOx requires SSHX
Op
tion (Digi
t 10 = X or Y).
22. Ultra Low NOx has 3 Ton Only
available with LOW heat (dig
it
10=X).
23. Ultra Low NOx has NO High Heat
Available.
24. Through the Base Gas Piping
(
Digit 18=B or C) NOT available
with Ultra Low NOx Option.
25. High Altitude kit is n
ot availab
le
with Ultra Low NOx option.
26. LP Conversion kit is not available
w
ith Ul
tra Low NOx option.
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