Armstrong Air BCE7S Series, Руководство по установке

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507746-01 Issue 1821 Page 17 of 39
Sensor Connections and Wiring Requirements
Outdoor Air Sensor
This is a two screw terminal for connection to an X2658
outdoor temperature sensor. The Control takes no
action on the sensor status other than to communicate
the temperature to the RSBus network. Wiring distance
between the AHC and outdoor temperature sensor should
not exceed 200 feet when wired with 18-gauge thermostat
wire.
• Minimum temperature: -40ºF (-40ºC)
• Maximum temperature: 70ºF (158ºC)
Air Handler Control 9-Pin Connector (P8)
1. Air Handler (no electric heat) – Two wire factory
harness (wired to pins 7 and 8) which provides 230
VAC power to Air Handler Control.
2. Air Handler (with electric heat) – Eight wire factory
harness (all pin position are wired as noted in Table 6).
Position Function / Description
1 Heat stage 1 relay coil
2 Heat stage 2 relay coil
3 Relay coil return
4 Not used
5 Not used
6 Not used
7 L1 230VAC supply from heater kit
8 L2 230VAC supply from heater kit
9 Not used
Table 6. Electric Heat Connection (P8)
Control Connections and Wiring Requirements
This section provides information on communicating and
non-communicating control connections and wire run
lengths.
Label Label Function
Thermostat
R 24VAC
i+ RSbus data high connection
i- RSbus data low connection
C 24VAC command (ground)
Outdoor Unit
R 24VAC
i+ RSbus data high connection
i- RSbus data low connection
C
24VAC command (ground)
Link
i+
Not used
i-
Table 7. Air Handler Control Connections –
Communicating
Wire Run Length AWG # Insulation / Core Types
Maximum length
or wiring for all
connections on the
RSbus is limited to
1500 feet (457 meters)
18
Color-coded,
temperature rating 95°F
(35°C) minimum, solid
core. (Class II Rated
Wiring)
Table 8. Run Length – Communicating
Wire Run Length AWG # Insulation / Core Types
Less than 100’ (30m) 18 Color-coded,
temperature rating 95°F
(35°C) minimum, solid
core. (Class II Rated
Wiring)
More than 100’ (30m) 16
Table 9. Run Length – Non-Communicating
Wiring Connections
1. Install line voltage power supply to unit from a properly
installed circuit breaker.
2. Ground unit at unit disconnect switch or to an earth
ground.
NOTE: Connect conduit to the unit using a proper
conduit fitting. Units are approved for use only with
copper conductors. A complete unit wiring diagram is
located on the back side of the unit’s access panel.
3. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit.