Carrier WEATHER MASTER 48P2 - Manual (Page 76)

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480079-01 Printed in U.S.A. Form 48P-4SI Pg 76 11-10 Replaces: 48P-3SI
Copyright 2010 Carrier Corporation
SMOKE PURGE — Smoke Purge mode removes smoke
from the interior spaces and replaces it with fresh outside air.
The factory-installed optional economizer with option/
accessory power exhaust are required for this function. Smoke
purge is accomplished by the following:
• turning supply fan on
• opening the economizer (option required)
• running the exhaust fans (option or accessory required)
• opening the exhaust dampers
See Fig. 82 for wiring.
SMOKE CONTROL INSTALLATION — Implementation of
the various smoke control modes on these units requires the in-
staller to modify the unit wiring to add contacts (via either
manual switches or relays) that will selectively interrupt and
override standard factory control sequences. See Table 31 and
Fig. 81 and 82 for more information.
Table 31 — Smoke Control Modes
LEGEND
*Power exhaust option required for this mode.
†Applicable to VAV units with appropriate options.
Fig. 86 — Open System Network Wiring
Fig. 86 — BT485 Installation
FUNCTION
MODE
Fire
Shutdown
Pressur-
ization
Evacuation*
Smoke
Purge*
Supply Fan Off On Off On
VFD† — Open/On — Open/On
Economizer Closed Open Open Open
Return Air
Damper
Open Closed Closed Closed
Exhaust
Fans
Off Off On On
Exhaust
Damper
Closed Closed Open Open
VAV — Variable Air Volume
VFD — Variable Frequency Drive