Modulating Hot Gas Re-Heat; Calibration; Checkout/Overrides - Carrier Omnizone 50BVC Installation, Start-Up, Service And Controls Operation And Troubleshooting

MODULATING HOT GAS RE-HEAT

Access: Tuning Parameters Screen,[RH PID] softkey
The Modulating Hot Gas Re-Heat screen (see Fig. 41) allows the
user to change the MHGRH Sample Time, Proportional, Integral
and Derivative gains, plus the Loop dead band and the Ramp
Interval. Care should be taken before changing any settings on this
screen. See Table 33 for screen function information.
Fig. 41 — Modulating Hot Gas Re-Heat Screen
Click the [PREV] softkey to return to the Fan Setpoints screen.
Table 33 — Modulating Hot Gas Re-Heat Screen
Functions
FIELD / KEY
External Ramp Enable
MHGRH SAMPLE TIME
(adjustable)
MHGRH P GAIN
(adjustable)
MHGRH I GAIN
(adjustable)
MHGRH D GAIN
(adjustable)
MHGRH LOOP DEADBAND
(adjustable)
MHGRH RAMP INTERVAL
(adjustable)
[Prev]

CALIBRATION

Hotkey Access:
Handheld BACview: Fn + 8
Virtual BACview: Ctrl + 8
The Calibration screen (see Fig. 42) allows the value of the
sensors to be offset. See Table 34 for screen function information.
Fig. 42 — Calibration Screen
Using the arrow keys, move the bracket to the value to be
changed. Click the [PREV] softkey to return to the previous
screen.
FUNCTION / INFORMATION
Not Applicable
Displays the current Sample Time
Displays the current Proportional Gain
Displays the current Integral GainKEY
Displays the current Derivative Gain
Displays the current Loop Deadband
Displays the current MHGRH Ramp Inter-
val
Softkey access to previous screen
Table 34 — Calibration Screen Functions
FIELD / KEY
LVG Water Sensor Offset
(adjustable)
Supply Temp Sensor Off-
set (adjustable)
Outside Temp Sensor Off-
set (adjustable)
ENT Water Sensor Offset
(adjustable)
[Prev]

CHECKOUT/OVERRIDES

Hotkey Access:
Handheld BACview: Fn + 9
.
Virtual BACview: Ctrl + 9
The Checkout/Overrides screen (see Fig. 43) displays the current
conditions of the digital outputs, analog outputs, analog inputs,
and binary inputs.
Fig. 43 — Checkout/Overrides Screen
To enable (on) or disable (off) the digital outputs:
1. Move the brackets to the appropriate output and press
ENTER. The screen softkeys will appear, allowing the value
to be changed.
2. Click the [INCR] or [DECR] softkeys to change the
value.
3. To save the change, click the [OK] softkey. To cancel the
change, click the [CANCEL] softkey.
54
FUNCTION / INFORMATION
Displays the existing temperature on the
left side and the amount of offset on the
right side. Offset can be from -9 to +99
Displays the existing temperature on the
left side and the amount of offset on the
right side. Offset can be from -9 to +99
Displays the existing temperature on the
left side and the amount of offset on the
right side. Offset can be from -9 to +99
Displays the existing temperature on the
left side and the amount of offset on the
right side. Offset can be from -9 to +99
Softkey access to previous screen