180
APPENDIX E — UPC OPEN CONTROLLER (cont)
To install a BT485 terminator, push the BT485 terminator,
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 H and I. 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 H — MS/TP Wiring Recommendations
LEGEND
Fig. K — BT485 Terminator Installation
a48-8582
SPECIFICATION
RECOMMMENDATION
Cable
Single twisted pair, low capacitance, CL2P, 22 AWG (7x30), TC foam FEP, plenum rated cable
Conductor
22 or 24 AWG stranded copper (tin plated)
Insulation
Foamed FEP 0.015 in. (0.381 mm) wall 0.060 in. (1.524 mm) O.D.
Color code
Black/White
Twist Lay
2 in. (50.8 mm) lay on pair 6 twists/foot (20 twists/meter) nominal
Shielding
Aluminum/Mylar shield with 24 AWG TC drain wire
Jacket
SmokeGard Jacket (SmokeGard PVC) 0.021 in. (0.5334 mm) wall 0.175 in. (4.445 mm) O.D.
Halar Jacket (E-CTFE) 0.010 in. (0.254 mm) wall 0.144 in. (3.6576 mm) O.D.
DC resistance
15.2 Ohms/1000 feet (50 Ohms/km) nominal
Capacitance
12.5 pF/ft (41 pF/meter) nominal conductor to conductor
Characteristic impedance
100 Ohms nominal
Weight
12 lb/1000 feet (17.9 kg/km)
UL Temperature Rating
SmokeGard 167°F (75°C)
Halar -40 to 302°F (-40 to 150°C)
Voltage
300 Vac, power limited
Listing
UL: NEC CL2P, or better
AWG
—
American Wire Gage
CL2P
—
Class 2 Plenum Cable
DC
—
Direct Current
FEP
—
Fluorinated Ethylene Polymer
NEC
—
National Electrical Code
O.D.
—
Outside Diameter
TC
—
Tinned Copper
UL
—
Underwriters Laboratories
* Halar is a registered trademark of Solvay Plastics.
† SmokeGard is a registered trademark of AlphaGary-Mexichem
Corp.
Summary of Contents for Carrier Weathermaker 48A2
Page 105: ...105 Fig 20 Typical Main Control Box Wiring Schematic 48 50A2 A3 A4 A5 Units...
Page 106: ...106 Fig 21 Typical Auxiliary Control Box Wiring Schematic...
Page 107: ...107 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown a48 8357...
Page 108: ...108 TO NEXT PAGE Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown A48 7296...
Page 109: ...109 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont A48 8358...
Page 110: ...110 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown a50 8228...
Page 111: ...111 Fig 25 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown...
Page 112: ...112 Fig 26 Typical Low Ambient Controls Option Wiring...
Page 113: ...113 Fig 27 Typical Small Chassis Component Location Size 020 035 Units...
Page 114: ...114 Fig 28 Typical Large Chassis Component Locations Size 040 060 Units...
Page 118: ...118 Fig 30 Economizer Control Board ECB1 and VAV Control Board ECB2 A48 7706...
Page 142: ...142 A48 3733 Fig 56 Main Burner Removal...
Page 176: ...176 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716...
