|
GENERAL:
8/15/96
Subject: Unitary Controller
Default setpoints.
For any of the unitary
controllers (ETM, VAV, UVC, TBC, or ETC) if you want to know what the
default setpoints are (occur upon power-up before it communicates with an
EP or EC), create one of the modules in PC/ESS and view the setpoints
before you change anything. The default
values in PC/ESS match the defaults that are built into the module.
8/15/96
Subject - Triac output will not energize a relay.
When a triac
output energizes, but the load it is controlling does not pull in, the
problem may be that the device does not draw enough power to energize the
triac. To correct this problem, you
can install a 1.5K ohm, 1/2 watt resistor across the load (like across the
relay coil). This will cause it to
draw about 16 milliamps extra.
NOTE: This only applies to
the 24Vac control side of a load.
DO NOT apply the resistor to a line voltage load.
8/27/96 Subject: U.L. Listings as of 8/27/96
|
Model #
|
U.L. 916
|
C.U.L.
|
U.L. 508
|
|
EP/2(all models)
|
X
|
X
|
|
|
EP/2-BPL
|
X
|
X
|
|
|
EC(all models)
|
X
|
X
|
|
|
IOM/2(all models)
|
X
|
X
|
|
|
IOM/2-BPL
|
X
|
X
|
|
|
IOM-1020
|
X
|
|
|
|
IOM-BPL
|
X
|
|
|
|
ETM-3010
|
X
|
X
|
|
|
VAV-4020
|
X
|
X
|
|
|
ETM-1020
|
X
|
|
|
|
MPS
|
X
|
|
|
|
LCU (both models)
|
|
X
|
X
|
Notes:
1)
C.U.L. = Canadian U.L. included.
2)
U.L. 916 is for Management Equipment - Energy.
3)
U.L. 508 is for Industrial Control Panels.
8/15/96
Subject - Lightning Arrestors for Vulnerable Com. Lines.
For installations
where communication wires are run between buildings (underground or
overhead), lightning arrestors may be needed for additional protection from
lightning induced surges. Lightning arrestors should be rated for a
standard 5 VDC differential, digital signal, 1800-9600 Baud RS-232/ RS-485.
|
