Service Group - Carrier 48FP Controls Operation And Troubleshooting

To enable Occupied Heating (VAV units) press
Enter the password. Press
figuration subfunction. Scroll down to OHEN (Occupied Heat-
ing Enable). The current configuration will be displayed (0 =
disabled, 1 = enabled). The default is disabled. To change the
configuration, press the number of the new configuration (ex-
ample: ) and then press
Heating Algorithms — SRV Formula:
SHSR = PID function on (Demand term)
where
VAV: (Demand term)
= Heating set point – Return-Air Temperature
CV: (Demand term)
= Heating set point – Space Temperature
Service Group —
This group includes Alerts and
Alarms, and Quick Test.
ALERTS AND ALARMS — Alerts and alarms are features
of the unit controls that facilitate diagnostics and troubleshoot-
ing activity.
Alerts — Alerts are initiated by the unit control when it detects
that a sensor condition has gone outside user-configured crite-
ria for acceptable range. Alerts are available for:
• Space Temperature/Occupied
• Space Temperature/Unoccupied
• Supply-Air Temperature
• Return-Air Temperature
• Outdoor-Air Temperature
• Relative Humidity
• Outdoor Air Relative Humidity
• Static Pressure
• Building Pressure
• Outdoor Air CFM
• Indoor Air Quality/Service Maintenance (accrued run
time since last service call)
To view Alerts, press
Alerts will be reset when the actual value returns to a value be-
tween the high limit and low limit range (shown in Table 14),
according to the reset value criteria in Table 15.
DESCRIPTION
Type of Heat
Enable Occupied Heating (VAV only)
Occupied Heating Set Point
Unoccupied Heating Set Point
*If value changed, enable Data Reset before leaving
NOTE: Occupied Heating Set Point serves as "Morning Warm-Up Set Point."
to enter into the User Con-
. See Table 13.
ENTER
. Scroll for active alerts.
Table 13 — Configuring Heating (VAV/CV)
HOW TO CONFIGURE AT HSIO
.
. Configuration — To configure Alert set points, press
to enter the Alert Limits subfunction. Scroll to the
desired alert. Enter new value. See Table 14 for default values
and available ranges. See Table 15 for alert reset criteria.
Alarms — Alarms are initiated by the unit control when it de-
tects that a sensor input value is outside its valid range (indicat-
ing a defective device or connection that prevents full unit op-
eration), that an output has not functioned as expected, or that a
safety device has tripped. Current (still active) alarms are main-
tained in the Status function (subfunction 1). Up to 9 of the last
(current and reset) alarms are stored in the History function.
Alarms are also broadcast to the CCN Building Supervisor.
There are 41 separate Alarms possible from the unit controls.
For a detailed explanation of each alarm, refer to the Trouble-
shooting section.
QUICK TEST — The Quick Test mode permits service tech-
nician to initiate a test of all inputs and outputs from the unit
control system. The test, initiated and controlled from the
HSIO, forces all outputs with a service priority. All service pri-
orities are removed on exit from the Quick Test. Quick Test is
Mode 40. An accessory HSIO module must be connected to
the unit to initiate Quick Test.
Sequence of Operation
1. Place unit in Standby mode (displays STBY YES).
2. Enter desired TEST subfunction.
3. Scroll down to desired test.
4. Press to initiate test.
ENTER
5. Input test will display the current sensor input value (if
analog-type) or contact status (if discrete-type).
6. Individual Output tests will cause discrete outputs to
be enabled, or will cause analog outputs to be cycled to
specific output values. Each output will be disabled by
selecting next output using the
enable an output test, press
7. Exiting TEST will remove all previously applied
forces.
SET POINT
HEAT
OHEN
OHSP
UHSP
16
or keys. To
.
ENTER
RANGE
Electric = 2*
Gas = 3
Hydronic = 1
None = 0
Enable = 1; Disable = 0
55 to 80 F (13 to 27 C)
40 to 80 F (4 to 27 C)