General Functions - Electra PXD912 Service Manual

CONTROL SYSTEM
11.3

General Functions

11.3.1 COMP Operation
a. For each Mode including POWER OFF & SB, a Min time delay of 3 min before
COMP restarting, excluding DEICING Mode (see para. 14.12.2).
b. The Min operation time of COMP under different operating conditions is:
Heat, Cool, HP protection or Auto Modes
Fan, Dry, Overflow, Protection Modes, or Mode Change
IFAN
11.3.2 operation
a. Min time interval between IFAN speed change in AUTOFAN Mode is 30 sec.
b. Min time interval between IFAN speed change in H/M/L Mode is 1 sec.
c. IFAN speed in Heat/Cool AUTOFAN Mode is determined according to the
following chart:
IFAN speed
H
M
L
Where in Heat Mode: 'T = SPT - RT
11.3.3 OFAN Operation
Min time interval between OFAN ON/OFF state changes is 30 sec.
11.3.4 HE Operation
a. Min Heaters ON or OFF time is 30 sec.
b. Heaters can never be in operation while IFAN is OFF.
c. In RH group, HE-1 and HE-2 will be activated only when COMP is not operating,
except in Dry Mode.
11-6
Operation Mode
1 2 3
in Cool Mode: 'T = RT- SPT
CONTENT
Min Operation Time of COMP
3 min.
Ignored
o
T [ c]
4
SM PXD 1-E.3 GB