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47
N2
1. Verify that the BAS and controller are both set to
speak the N2 protocol. The protocol of the controller
is set via SW3 (switches 3, 4, 5, and 6). The protocol
can also be verified by getting a Modstat of the
controller through the BACview. Hit the “FN” key
and the “.” key at the same time to pull up a Modstat.
Scroll to the bottom of the page and there is a section
entitled “Network Communications.” The active
protocol and baud rate will be shown in this section.
2. Verify that the BAS and controller are set f or 9600
baud. The baud rate of the controller is set via SW3
(switches 1 and 2). The baud rate can also be verified
via the BACview by obtaining a Modstat ( see above).
3. Verify that the BAS is configured to speak 2 -- wire
EIA--485 to the controller. The BAS may have to
configure jumper or DIP switches on t heir end.
4. Verify that the BAS and the controller have the same
communication settings (8 data bits, No Parity, and 1
stop bit).
5. Verify tha t the controller has a unique N2 slave
address on the N2 bus. The controller’s N2 slave
address is set by its rotary address switches.
6. Verify proper wiring between the BAS and the
controller.
7. Verify that the BAS is reading or writing to the proper
network point addresses on the cont roller. Download
the latest points list for the controller to verify.
8. Verify that the BAS is sending his requests to the
proper slave address of our controller.
NOTE: See RTU-- MP 3rd Party Integration Guide (or
alternatively Form 48--50H--T--1T Appendix) for N2
Protocol Conform ance Sta tement.
ECONOMIZER SYSTEMS
The 548J units may be equipped with a factory--installed
or accessory (field--installed) economizer system. Two
types are available: with a logic control system
(EconoMi$er IV) and without a control system
(EconoMi$e r2). See Fig. 66 and Fig. 67 for component
locations on each type. See Fig. 68 and Fig. 69 for
economizer section wiring diagrams.
Both economizers use direct--drive damper actuators.
ECONOMI$ER IV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
A
CTUATOR
WIRING
HARNESS
C06021
Fig. 66 -- EconoMi$er IV Component Locations
ECONOMI$ER2
PLUG
BAROMETRIC
RELIEF
DAMPER
OUTDOOR
AIR HOOD
HOOD
SHIPPING
BRACKET
GEAR DRIVEN
DAMPER
C06022
Fig. 67 -- EconoMi$er2 Component Loc ations
548J