Carrier 62E User Manual

Page 27

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 CO

CONTROL — The supply fan speed

will be modulated to provide supply airflow between minimum

and maximum levels based on a programmed indoor CO

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

LEGEND

WIRING SPECIFICATIONS

RECOMMENDED VENDORS AND PART NUMBERS

Wire Type

Description

Connect Air

International

Belden

RMCORP

Contractors

Wire and Cable

MS/TP

Network (RS-485)

22 AWG, single twisted shielded pair, low capacitance, CL2P,
TC foam FEP, plenum rated. See MS/TP Installation Guide for
specifications.

W221P-22227

—

25160PV

CLP0520LC

24 AWG, single twisted shielded pair, low capacitance, CL2P,
TC foam FEP, plenum rated. See MS/TP Installation Guide
for specifications.

W241P-2000F

82841

25120-OR

—

Rnet

4 conductor, unshielded, CMP, 18 AWG, plenum rated.

W184C-2099BLB

6302UE

21450

CLP0442

AWG

— American Wire Gage

CL2P

— Class 2 Plenum Cable

CMP

— Communications Plenum Rated

FEP

— Fluorinated Ethylene Polymer

— Tinned Copper

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