TempMaster OmniElite - Controls

47
TEMPMASTER
FORM TPM3-EG1 (518)
Controls
CONTROL SEQUENCES
FOR VARIABLE AIR VOLUME (VAV)
AND SINGLE ZONE VAV (SZVAV)
GENERAL
The control system for the TempMaster
®
OmniElite
™
single package unit is fully self-con-
tained and based around a single package unit controller. To aid in unit setup, mainte-
nance, and operation, the single package unit controller is equipped with a user interface
that is based around a 4 line x 20 character backlit liquid crystal display (LCD). The LCD
displays plain language text in a menu-driven format to facilitate use.
Based on the unit type (variable air volume (VAV) or single zone VAV (SZVAV)), the Temp-
Master OmniElite single package units can be operated by a space temperature sensor or
standalone. A field wiring terminal block is provided to facilitate unit setup and installation.
In lieu of the hardwired control options, the single package unit controller can be con-
nected to and operated by a building automation system (BAS).
The IPU controller uses the latest technology and provides complete control for the unit
along with standard BACnet
®
MS/TP and Modbus
™
remote terminal unit (RTU) communi-
cations. The IPU controller also has an SD card slot that can be used to capture historic
data on unit operation.
If required, the unit can be equipped with an optional field-installed gateway that allows N2
or Echelon
®
communications. The E-Link gateway device is field installed and purchased
through the advanced order management system (AOMS).
YK-ELNKE01-0 – E-Link for Echelon
YK-ELNKE00-0 – E-Link for N2
UNOCCUPIED/OCCUPIED SWITCHING
Depending on the application, the unit can be indexed between unoccupied and occupied
modes of operation by one of three methods, hardwired input, internal time clock, or BAS.
A contact-closure input is provided for hardwiring to an external indexing device such as
a central time clock or a manual switch. The unit controller is also equipped with a built-
in 7-day time clock that can be used in lieu of the contact closure input to switch the unit
between unoccupied and occupied modes of operation.
The internal time clock is fully configurable via the user interface and includes holiday
scheduling. In addition to the hardwired input or the internal time clock, the unit can also
be indexed between unoccupied and occupied modes of operation via a BAS command.
GAS HEATING OPERATION
Units supplied with gas heat can be equipped with one, two, or three independently oper-
ated burner modules. Each module is fully self-contained furnace with all necessary igni-
tion controls, safeties, and gas valves. The IPU controller determines how the furnaces
are started and stopped and prevents furnace operation if the supply fan airflow is not
sufficient or if the supply air temperature (SAT) is excessively high. If a furnace module
receives a signal to start from the IPU controller, the ignition control engages the furnace
inducer (draft) fan for a 30-second pre-purge cycle. At the end of the 30-second pre-
purge, the ignition control will stop the furnace and allows the inducer fan to operate for a
30-second post-purge. Each furnace contains a direct spark ignition system and included
safeties for flame and inducer fan verification, high temperature, and flame rollout.