Title 24 / Remote Monitoring - LG ARNU363DDA4 Installation Manual

Economizer for split rooftop units (rtu)

Installation manual (60 pages)

Installation manual (66 pages)

Installation manual (46 pages)

Table of Contents

California's Title 24 High Temperature Limit Settings

California's Title 24 code requires a high temperature limit setting for all dry bulb outside air economizer change over. The temperatures vary

by the region within California. See Table 6 for high limit settings.

Table 6: California Title 24 Regional High Limit Dry Bulb Temperature Settings.

Device Type*

Fixed Dry Bulb

Differential Dry Bulb

Fixed Enthalpy** + Fixed Dry Bulb

*Only the high limit control devices listed are allowed to be used and at the set points listed. Others such as Dew Point, Fixed Enthalpy, Electronic Enthalpy, and Differential Enthalpy

Controls, may not be used in any climate zone for compliance with Section 140.4(e) 1 unless approval for use is provided by the Energy Commission Executive Director.

**At altitudes substantially different than sea level, the Fixed Enthalpy limit value shall be set to the enthalpy value at 75°F and 50% relative humidity. As an example, at approximately

6,000 foot elevation, the fixed enthalpy limit is approximately 30.7 Btu/lb.

Remote (Downstairs) Monitoring of Controller's Fault Detection and

Diagnostics

Many codes including IECC, Title 24, and ASHRAE 90.1 require that the economizer's faults be accessible by operating or service personal,

or annunciated locally on zone thermostat. To setup remote monitoring on the controller, under SYSTEM SETUP, AUX1-OUT must be set to

SYS.

The latest versions of Honeywell's TH8321WF or TH8321R thermostats are options for meeting this requirement. Figure 40 shows an ex-

ample of the thermostat wiring to the JADE controller. Follow instructions provided with Honeywell thermostat.

Another option that is acceptable to some codes is an annunciator light visible by service personnel. See Figure 41 for typical wiring to the

JADE controller. Refer to codes for proper labeling of light.

Figure 40: Thermostat Wired for Remote FDD.