Carrier 50PG03-07 installation instructions Field Control Thermidistat Wiring

50PG03-- 07

Temperature Control

The unit can be controlled with either a Carrier-approved space temperature sensor, a Carrier accessory Thermidistatt device, or a Carrier-approved accessory thermostat. Install the temperature control device according to the installation instructions included with the accessory. Locate the device on a solid interior wall in the conditioned space to sense average temperature. Carrier space temperature sensor wiring connections are shown in Fig. 10. General thermostat field control wiring connections are shown in Fig. 9. Carrier Thermidistat device wiring connections are shown in Fig. 11. Configuration of the unit control is required to specify the control input type before unit operation.

Route thermostat or space temperature sensor cable or equivalent single leads of colored wire from subbase terminals through conduit into unit to low-voltage connections as shown on unit label wiring diagram and in Fig. 9-11.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gauge) insulated wire (35_C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35_C minimum). For over 75 ft, use no. 14 AWG insulated wire (35_C Minimum). All wire larger than no. 18 AWG cannot be directly connected at the thermostat and will require a junction box and splice at the thermostat.

Set heat anticipator settings as follows:

VOLTAGE	Stage 1	STAGE 1 AND 2
	(W1) ON	(W1 AND W2) ON
All	0.2	0.4

Settingsmay be changed slightly to provide a greater degree of comfort for a particular installation.

Humidity Control

Unit can be controlled with either a Carrier accessory Thermidistat device or a Carrier-approved accessory humidistat (switch output). The input for an accessory humidity sensor with 4 to 20 mA output is another option available when an economizer board is installed. Install the humidity control device according to the installation instructions included with the accessory. Locate the device on a solid interior wall in the conditioned space to sense average humidity. Carrier Thermidistat device wiring connections are shown in Fig. 11. General humidistat wiring connections are shown in Fig. 12. Configuration of the unit control is required to specify the control input type before unit operation. Refer to the

Controls, Start-up, Operation and Troubleshooting manual for configuration.

Units with the Humidi-MiZertoption receive a discrete input from a field-installed device (such as from the Carrier humidistat or Thermidistat device). The discrete input is connected to the TB1 terminal strip points labeled Humidistat 1 and 2. As this is a discrete input, one of the connection points is for power to the switch and the other is the return path. (See Fig. 12.)

A space relative humidity sensor input (SP.RH) is only available if an economizer board (ECB) is installed in the unit and then the sensor can be connected to the OAQ point TB1-4. (See Fig. 12.) This input is used instead of the discrete humidistat or thermidistat inputs. The input controls the Humidi-MiZer using the 4 to 20 mA as percent humidity. The relative humidity value (measured by the relative humidity sensor) can be displayed on the Scrolling Marquee, in the space through a System Pilott device, or can be read by other CCN devices where it can be used to perform more advanced functions. The humidity sensor must be configured correctly; refer to the Controls, Start-up, Operation, and Troubleshooting manual for details.

If the customer also wishes to install a smoke detector into a Humidi-MiZer equipped 50PG unit, the fire shutdown connection points are on Plug PL-19, located in the economizer section. See the unit wiring schematic for wiring. For third-party smoke detector, see Fig. 13.

Point 19-3 is the 24 vac power source for the detector and point 19-5 is the 24 vac signal input for fire shutdown.

More information is available in the third party control section of the Controls, Start-up, Operation, and Troubleshooting manual.

					THERMIDISTAT
										DEHUM
	OC	R	Y1	Y2	W1	W2	G	C
TB1	5	R	Y1	Y2	W1	W2	G	C	1		2
									HUMIDISTAT
					ROOFTOP UNIT

C07055

Fig. 11 - Field Control Thermidistat Wiring

C07045

Fig. 12 - Humidi-MiZer Low-Voltage Terminal Strip - Humidity Sensor/Humidity Wiring

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