Third Party Control, Controls Operation | Carrier 48/50PD05 instruction

Cooling Test

The cooling (COOL) submenu is used to change output status for testing the cooling function. The fans (FANS) and heating (HEAT) service test outputs are reset to OFF for the cooling service test. The digital scroll controller power test (CTLR) turns on and off the compressor controller. The compressor capacity test (CPAC) is used to run the compressor at a desired capacity of 15% to 100%. If a capacity is chosen between 1 and 14, the capacity will be set to 15%. The outdoor fan will turn on to high speed when the compressor capacity is 15% or greater. The indoor fan speed will default to supply fan maximum speed (FS.MX) when the compressor capacity test is first activated. The cool test fan speed (F.SPD) is used to change the fan speed while the compressor is running. All normal cooling alarms and alerts are functional.

IMPORTANT: When charging the unit, both the compressor capacity test and the cool test fan speed should be set to 100%.

Heating Test

The heating (HEAT) submenu is used to change output status for the individual heat stages, gas or electric. The fans (FANS) and cooling (COOL) service test outputs are reset to OFF for the heating service test. Indoor and outdoor fans are controlled normally to maintain proper unit operation. The indoor fan speed will run at the configured max speed FS.MX. All normal heating alarms and alerts are functional.

Table 5 — Service Test Modes and Submodes Directory

DISPLAY MENU/	EXPANDED NAME	VALUES
SUB--MENU/	EXPANDED NAME	VALUES
NAME
SERVICE TEST
TEST	Field Service Test Mode	On/Off

INDP	Test Independent Outputs
ECON	Economizer Position Test	0 to 100%
E.CAL	Calibrate Economizer	On/Off
PE.1	Power Exhaust 1 Test	On/Off
PE.2	Power Exhaust 2 Test	On/Off
ALRM	Alarm Relay Test	On/Off
CCH	Crankcase Heat Test	On/Off
FANS SUPPLY	Test Fans
IDF	VFD Power Test	On/Off
F.SPD	Indoor Fan Speed Test	0 to 100%
OFC.1	Outdoor Fan Relay Test	On/Off
COOL	Test Cooling
CTLR	Dig Scroll Ctrl Pwr Test	On/Off
CAPC	Compressor Capacity Test	0 to 100%
F.SPD	Cool Test Fan Speed	0 to 100%
HEAT	Test Heating
HT.1	Heat Stage 1 Test	On/Off
HT.2	Heat Stage 2 Test	On/Off

THIRD PARTY CONTROL

Third party controls may interface with the unit ComfortLinkt controls through the connections described below. See other sections of these instructions for more information on the related unit control and configurations.

Remote Occupancy

The remote occupancy input is provided on the field connection terminal board (TB1). The Remote Occupancy Switch configuration, Configuration→UNIT→RM.SW, identifies the normally open or normally closed status of this input when unoccupied.

S5 = 24 VAC signal input

S6 = 24 VAC source for dry contact

Fire Shutdown

The fire shutdown input is provided for unit shutdown in response to a fire alarm or smoke detector. The Fire Shutdown Switch configuration, Configuration→UNIT→FS.SW, identifies the normally open or normally closed status of this input when there is no fire alarm.

Input at field connection terminal board (TB1)

SFire Shutdown 1 = 24 VAC source for dry contact S Fire Shutdown 2 = 24 VAC signal input

Alarm Output

The alarm output is provided on the field connection terminal board (TB1) to indicate a current alarm status. The output will be 24VAC if a current alarm exists.

SC = 24 VAC common

SX = 24 VAC signal output

Economizer Monitoring

On field terminal board (TB1), terminals 8, 9, and 10 can be used to monitor economizer position from a third party control system. See economizer operation section for additional information.

In digital mode (E.CTL = 1 or 2), the economizer commanded position can be read as a 2-10v or 4-20mA signal. TB1-8 and TB1-9 are used as follows:

STo read a 2-10v signal, disconnect the violet wire on TB1-J10-8 and place volt meter device across TB1-8 and TB1-9.

STo read a 4-20mA signal, disconnect the violet wire on TB1-J10-8 and the 500Ω resister at TB1-J10-6. Place amp meter device between TB1-8 and TB1-9.

In analog mode (E.CTL = 3), the economizer position can be read as a 2-10v feedback signal across TB1-10 and TB1-9 at any time.

IMPORTANT: The violet wire and 500Ω resister must be connected at the J10 connector as originally wired to operate the economizer in analog mode.

Economizer Damper Control

For units with the economizer option or accessory and the ECB control board, the damper position can be directly controlled through the IAQ sensor input provided on the field connection terminal board. The IAQ Analog Input configuration, Configuration→AIR.Q→IA.CF will have to set to 3 (Control Minimum Position). When IA.CF = 3, an external 4 to 20 mA source is used to move the damper 0% to 100% directly.

Terminal 2 = 4-20mA + signal Terminal 3 = 4-20mA - common

IMPORTANT: In this mode preset minimum positions configurations are not valid. The damper position may exceed the input position to provide economizer cooling and CO2 sensor input can not be used for DCV control. Refer to the Indoor Air Quality operation section for more information.

CONTROLS OPERATION

Display Configuration

The Configuration→DISP submenu is used to configure the local display settings.

Metric Display (METR)

This variable is used to change the display from English units to Metric units.

Language Selection (LANG)

This variable is used to change the language of the ComfortLink display. At this time, only English is available.

48/50PD

48/50PD05 specifications

The Carrier 48/50PD05 is a remarkable addition to Carrier's lineup of rooftop units, offering advanced cooling and heating solutions for commercial applications. Designed for medium-sized buildings, this unit is well-suited for both new installations and as a replacement for older systems, thanks to its versatile features and efficient performance.

One of the standout features of the 48/50PD05 is its energy efficiency. It incorporates state-of-the-art technology to achieve high Seasonal Energy Efficiency Ratios (SEER) and EER ratings, reducing operational costs while delivering superior comfort. The unit is also compliant with the latest energy regulations, making it an environmentally friendly choice for building owners concerned about sustainability.

The 48/50PD05 is equipped with a highly efficient scroll compressor, which not only enhances performance but also contributes to quiet operation. This is a significant advantage in commercial spaces where noise levels need to be kept in check for comfort and productivity. Additionally, the unit includes advanced airflow design, ensuring even distribution of conditioned air throughout the space.

Technologically, the Carrier 48/50PD05 features Carrier's Infinity Control system, which allows for precise control of indoor climate. This intelligent control mechanism can be integrated with smart building management systems, enabling users to monitor and manage energy use effectively. Wi-Fi connectivity is also available, providing remote access for real-time adjustments and diagnostics.

Durability is another characteristic of the 48/50PD05. Constructed with high-quality materials, the unit withstands various environmental conditions, ensuring longevity and reliability. Moreover, the modular design facilitates easy maintenance, making service procedures efficient and cost-effective.

In addition to cooling, the Carrier 48/50PD05 offers heating capabilities, often utilizing gas or electric heating options that can be tailored to the specific needs of a building. The unit can also be equipped with integrated economizers, allowing for free cooling during suitable outdoor conditions, further enhancing energy savings.

Overall, the Carrier 48/50PD05 stands out as a high-performance HVAC solution that combines efficiency, technology, and durability. It provides building owners with a versatile tool to ensure comfort while minimizing their environmental footprint. With a strong emphasis on energy savings and advanced control features, this rooftop unit is a smart investment for any commercial property.