AAON RN Series - System Setting Screens; Table 28 - Stages of Electric Preheat

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9. OAT - Outside air inlet temperature (°F).
10. LATA - Leaving air probe "A"
temperature (°F).
11. LATB - Leaving air probe "B"
temperature (°F).
12. ManSTG - Manual override stage for
system testing. Any override
automatically cancels after ten minutes; 0
indicates normal operation, 1-6
corresponds to stages 1-6 being forced
on. Stage 1, the SCR, is forced to 50%.
System Setting Screens
These screens are access by pressing the up
button and then entering the technician
password 2425. The screens are scrolled
through by pressing either right or left
buttons on the controller. Adjustment is made
by pressing the up and down buttons. After a
short time of inactivity, the screen will go
back to the Status Display Screens.
1. StartDly - Seconds of delay after the
'Enable' call before heating starts. This is
to allow the Supply Fan to come up to
speed. Supply Fan VFD’s have a 45
second ramp up time. Range = 1sec-
60sec, and the default is 15sec.
2. BelowLLT - "Below Low Limit Time".
Range = 10sec-1800sec, and the default
is 10sec. If ‘LLTset’ temperature is not
reached within ‘BelowLLT’ after
reaching full output, the status relay will
operate.
3. Stages - Number of stages. Range = 1-6,
and the default is 1. The number of stages
can be determined using Table 28.
Table 28 - Stages of Electric Preheat
Tonnages
Feature 14B
Stages
A Cabinet
RN 6-8 and
10 tons
G = 10 kW
1
J = 20 kW
K = 30 kW
2
L = 40 kW
M = 50 kW
3
N = 60 kW
B Cabinet
RN 9 and
11-15 tons
J = 20 kW
1
K = 30 kW
2
L = 40 kW
M = 50 kW
3
N = 60 kW
P = 70 kW
4
Q = 80 kW
C Cabinet
RN 16-25
and 30 tons
J = 20 kW
1
K = 30 kW
2
L = 40 kW
M = 50 kW
3
N = 60 kW
P = 70 kW
4
Q = 80 kW
R = 90 kW
5
S = 100 kW
T = 110 kW
6
U = 120 kW
4. LATset - Leaving air temperature
setpoint. Range = 35°F-80°F, and the
default is 50°F.