Electra EMD 40 - OFAN Operation; General Functions for All Models; IFAN Operation; COMP Operation

7-7
CONTROL SYSTEM
Revision Y05-01Service Manual - EMD Series
2 General functions for all models
2.1 COMP operation
2.1.1 For each Mode including POWER OFF & SB, a Min time delay of 3 min before COMP restarting, excluding
DEICING Mode (see 7.2.1).
2.1.2 The Min operation time of COMP under different operating conditions is
Operation Mode
Min operation time of
COMP
Heat, Cool, H.P protection or Auto Modes 3 min.
Fan, Dry, Overflow, Protection modes, or mode change ignored
2.2 IFAN operation
2.2.1 Min time interval between IFAN speed change in AUTOFAN Mode, is 30 sec.
2.2.2 Min time interval between IFAN speed change in H/M/L Mode is 1 sec.
2.2.3 IFAN speed in Heat/Cool Autofan Mode is determined according to the following chart:
T [
o
c]
L
M
H
IFAN speed
3142
where in Heat Mode: 'T = SPT - RT
in Cool Mode: 'T = RT- SPT
2.3 OFAN operation
2.3.1 Min time interval between OFAN ON/OFF state change is 30 sec.
2.4 HE operation
2.4.1 Minimum Heaters ON or OFF time is 30 sec.
2.4.2 Heaters can never be in operation while IFAN is OFF.
2.4.3 In RH group, HE-1 and HE-2 will be activated only when COMP is not
operating, except in Dry Mode.
2.5 Protections
2.5.1 High pressure protection is applicable to all operating modes.
2.5.2 Deicing control is valid in Heat and Auto Heat Mode only.
2.5.3 Defrosting control is valid in Dry, Cool, and Auto Cool Modes.