Carrier 62E Wiring Specifications Recommended Vendors and Part Numbers, Rmcorp, Awg, CL2P, Cmp

MOTORIZED DAMPERS — Units may have an optional two-position outside-air damper, exhaust-air damper, or both. The dampers will modulate closed when the ERV is off.

MODULATING CO2 CONTROL — The supply fan speed will be modulated to provide supply airflow between minimum and maximum levels based on a programmed indoor CO2 level.

BUILDING PRESSURE CONTROL — The exhaust fan speed will be modulated to provide supply airflow between minimum and maximum levels based on a programmed indoor building pressure.

ERV UNIT WITH ECONOMIZER, STOP JOG AND EXHAUST BLOWER RUNNING — This option is used when the RTU is equipment with an economizer without pow- er exhaust. When the RTU opens the economizer to provide free cooling, the ERV supply fan will turn off. The ERV wheel will be periodically rotated to prevent build-up of contaminates on the wheel. The ERV exhaust fan will continue to operate.

ERV UNIT WITH ECONOMIZER; ERV DOES NOT RUN — This option is used when the RTU is equipped with an economizer with power exhaust. When the RTU opens the economizer to provide free cooling, the ERV supply and ex- haust fans will turn off. The ERV wheel will also be turned off.

ComfortLink™ Interface Device — The purpose of the device is to provide factory-installed “Plug and Play” con- trol interface between the 62E and a Carrier rooftop unit Com- fortLink control system. The interface allows for optimal sys- tem operation by sharing unit data and properly coordinating energy recovery, economizer, and power exhaust operation.

For HVAC units with electro-mechanical controls, damper end switches or relays may be used to coordinate the econo- mizer and power exhaust operation with the ERV. On units with ComfortLink controls, this becomes more of a challenge since the economizer and power exhaust sequencing is deter- mined through software logic and not electromechanical devic- es. The ComfortLink interface device allows the 62E controls to read key data points and force critical operating parameters in the 48/50A unit’s ComfortLink logic to ensure proper sys- tem operation. The factory-installed option includes a pre- programmed translator that allows the 62E controller to access the ComfortLink controls through the unit’s LEN (local equipment network) plug.

Optional BACnet or LON Communications Interface — The BACnet* Communication interface and LON (local operating network) communications interface options use the UPC Open controller. The controller

communicates using BACnet on an MS/TP network segment communications at 9600 bps, 19.2 kbps, 38.4 kbps, or 76.8 kbps.

WIRING — Wire the controllers on an MS/TP network seg- ment in a daisy-chain configuration. Wire specifications for the cable are 22 AWG (American Wire Gage) or 24 AWG, low-ca- pacitance, twisted, stranded, shielded copper wire. The maxi- mum length is 2000 ft.

Install a BT485 terminator on the first and last controller on a network segment to add bias and prevent signal distortions due to echoing. See Fig. 25-27.

To wire the UPC Open controller to the BAS (buidling au- tomation system) network:

1.Pull the screw terminal connector from the controller's BAS Port.

2.Check the communications wiring for shorts and grounds.

3.Connect the communications wiring to the BAS port’s screw terminals labeled Net +, Net -, and Shield.

NOTE: Use the same polarity throughout the network segment.

4.Insert the power screw terminal connector into the UPC Open controller's power terminals if they are not current- ly connected.

5.Verify communication with the network by viewing a module status report. To perform a module status report using the BACview keypad/display unit, press and hold the “FN” key then press the “.” Key.

To install a BT485 terminator, push the BT485, on to the BT485 connector located near the BACnet connector.

NOTE: The BT485 terminator has no polarity associated with it.

To order a BT485 terminator, consult Commercial Products i-Vu®Open Control System Master Prices.

MS/TP WIRING RECOMMENDATIONS — Recommen- dations are shown in Tables 7 and 8. The wire jacket and UL temperature rating specifications list two acceptable alterna- tives. The Halar specification has a higher temperature rating and a tougher outer jacket than the SmokeGard specification, and it is appropriate for use in applications where the user is concerned about abrasion. The Halar jacket is also less likely to crack in extremely low temperatures.

NOTE: Use the specified type of wire and cable for maximum signal integrity.

Table 7 — UPC Open System Wiring Specifications and Recommended Vendors

		WIRING SPECIFICATIONS	RECOMMENDED VENDORS AND PART NUMBERS
	Wire Type	Description	Connect Air	Belden	RMCORP	Contractors
			International			Wire and Cable
		22 AWG, single twisted shielded pair, low capacitance, CL2P,
		TC foam FEP, plenum rated. See MS/TP Installation Guide for	W221P-22227	—	25160PV	CLP0520LC
	MS/TP	specifications.
Network (RS-485)		24 AWG, single twisted shielded pair, low capacitance, CL2P,
		TC foam FEP, plenum rated. See MS/TP Installation Guide	W241P-2000F	82841	25120-OR	—
		for specifications.
	Rnet	4 conductor, unshielded, CMP, 18 AWG, plenum rated.	W184C-2099BLB	6302UE	21450	CLP0442
	LEGEND
AWG	— American Wire Gage
CL2P	— Class 2 Plenum Cable
CMP	— Communications Plenum Rated
FEP	— Fluorinated Ethylene Polymer
TC	— Tinned Copper

* Sponsored by ASHRAE (American Society of Heating, Refrigerat- ing, and Air Conditioning Engineers).

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