Page 11
Table 10. NTC Controller Parameters
Control
No
Parameter Name
Control Value
Units Description
Min Def Max
A2.05 Cooling Deadband 1 1 3.75 Deg. F Cooling stage deadband. A2.05 <=A4.03−A1.04
A2.06
Upper Stage Cooling
Latch Option
0 0 1 Option Option used to hold upper stage on until lower stage demand is satised.
A2.07 Cooling Stage−Up Timer 0 15 60 Min.
Optional timer used to call the upper demand if the lower stage runs for this
time. Disabled if set to “0”.
A2.08
Cooling Stage Down
Timer
0 15 30 Min.
Optional time delay that occurs before a lower stage turns off following a
higher stage termination.
A2.09
Occupied Cool−Down
Delay
0 30 120 Min. The off delay on OCP output for rst cooling demand in occupied period.
A2.10
Cooling Return Air Limit
Option
0 0 1 Option Cooling return air limit option enable.
A2.11 Cooling Return Air Limit 60 65 90 Deg. F
Return air temp. limit. Cooling outputs off if return air temp. exceeds limit.
ECTO A2.10 must be set to 1 to enable this limit.
A2.12
Cooling Blower On
Delay
0 0 60 Sec. The time before the blower turns on after a cooling demand.
A2.13
Cooling Blower Off
Delay
0 0 300 Sec. The time the blower stays on after the cooling demand is terminated.
A2.14 Compr. Off Delay 60 300 510 Sec. Compressor minimum off delay.
A2.15
Cooling Compr. Low
Temp. Lockout
−30 0 80 Deg. F
Cooling low ambient compressor lockout temperature. A value of –31°F
will disable the low ambient lockout function. Outdoor air sensor required
(RT17).
BLOCK 3 MISCELLANEOUS PARAMETERS
A3.01
Service Input Alarm
Delay
0 1 10 Min. The time delay used before alarm is generated.
A3.02
Service Input Alarm
Description.
0 0 1 Option
The description option for the alarm associated with the Service Input.
0−Service Input energized
1−Dirty Filter
A3.03
Normally Open Input
Alarm Description
0 0 1 Option
The description option for the alarm associated with the N.O. Input.
0−Normally Open Input energized
1−Smoke alarm
A3.04
Normally Closed Input
Alarm Description
0 0 2 Option
The description option for the alarm associated with the N.C. Input.
0−Normally Closed Input energized
1−Blower overload trip
2−Loss of phase protector trip
A4.01
Continuous Blower
Control
0 1 0 Option
Option for setting the blower to continuous during occupied period.
0=Blower cycles with demands 1=Continuous blower
A4.02
Zone Sensor
Calibration
5 0 −5 Deg. F Used for calibrating the zone sensor.
A4.03
Auto-changeover Dead-
band
2 3 10 Deg. F
The temperature deadband between heating and cooling demands. Do not
change this parameter when an NCP is used.
A4.04 Auto-changeover Delay 1 5 15 Min.
The off delay used when moving from heating to cooling or cooling to
heating demand.
A4.05
Air Proof
Switch Delay
10 20 120 Sec
After G is energized, if the Air Proof Switch is not on after this delay, the
controller will issue an alarm.
A4.06
Start−Up Demand
Delay
2 2 30 Mins
The demand delay after power is applied to the NTC or after a controller
reset. This delay may be adjusted to stagger unit demands when units are
powered on.
A4.07 System_Mode 0 0 2 Option
0 – Local sensor (A2 wired to NTC P−178).
1 – Remote sensor (A74 Comfort Sensor connected to SysBus).
2 – Discharge air control remote demand (used only with L Connection
zoning applications).
A4.08 DACH_SP 80 110 140 Deg. F Discharge air control heating setpoint.
A4.09 DACH_Stg_DB 5 5 20 Deg. F Discharge air control heating stage deadband.
A4.10 DACH_StgUp_Dly 0 180 900 Sec Discharge air control heating stage−up time delay.
A4.11 DACH_StgDn_Dly 0 120 600 Sec Discharge air control heating stage−down time delay.
A4.12 DACH_Stg_diff 2 2 20 Deg. F Discharge air control heating stage differential.
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