Accessory Installation
Check to make sure that all accessories including sensors have been installed and wired as required by the instructions and unit wiring diagrams.
Orifice Change (48PD Only)
This unit is factory assembled for heating operation using natural gas at an elevation from sea level to 2000 ft.
Use accessory high altitude kit when installing this unit at an elevation of 2000 to 7000 ft. For elevations above 7000 ft, refer to High Altitude section to identify the correct orifice size for the elevation. Purchase these orifices from your local Carrier dealer. Follow instructions in accessory Installation Instructions to install the correct orifices.
Use accessory LP (liquid propane) gas conversion kit when converting this unit for use with LP fuel usage for elevations up to 7000 ft. For elevations above 7000 ft, refer to High Altitude section to identify the correct orifice size for the elevation. Purchase these orifices from your local Carrier dealer. Follow instructions in accessory Installation Instructions to install the correct orifices.
Gas Heat (48PD Only)
Verify gas pressures before turning on heat as follows:
1.Turn off
2.Connect pressure gauge to supply gas tap, located on
3.Connect pressure gauge to manifold pressure tap.
4.Turn on
C06323
Fig. 5 - Field Gas Piping
5.After the unit has run for several minutes, verify the supply gas pressure is between
IMPORTANT: Supply gas pressure must not exceed
6.Set Service Test→HEAT→HT.1 to OFF using Scrolling Marquee.
7.Exit Service Test mode by setting Service Test→TEST to “OFF” using the Scrolling Marquee.
CONTROLS QUICK SET-UP
The following information will provide a quick guide to setting up and configuring the 48/50PD series units with ComfortLink™ controls. Unit controls are
Control Set Point and Configuration Log
During start up, accessory installation, and equipment service set points and/or configuration changes might have to be made. When setting set points or changing configuration settings, documentation is recommended. The Control Log starting on page 106 should be filled out and left with the unit at all times. A copy should also be provided to the equipment owner.
Standard Unit Control
There are two different applications these units can be applied to, Displacement Ventilation and Single Zone VAV. For either application a direct wired space sensor can be used or a communicating sensor/thermostat can be used. Installation of an accessory supply air temperature (SAT) sensor in the supply duct is recommended when using a communication type control. A supply duct SAT measurement is valid for heating mode display, while the
There are several configurations that should be considered for Displacement Ventilation or Single Zone VAV applications. Table 3 shows these configuration defaults and specific application settings. These settings typical values and should be adjusted for each actual specific unit application. Refer to the Operation section for more detail on these configurations and how they effect the units operation.
IMPORTANT: Multiple zoning application is not recommended at this time with the PD product.
Space Temperature Sensor
Wire accessory space temperature sensor(s) to the
T-58 Communicating Thermostat
Install the
48/50PD
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