3-8
850 Mt / 950 Mt
a. CPL Bypass Valve
The valve is controlled by the micro (P2).The valve
opens and closes at the values chosen by FN6.
See Table 1--4 “Bypass Valve Setup”.
The valve is energised during pull--down if the
suction pressure is below the value chosen by FN6
(default = 1.17 bars). If the pressure rises above the
value chosen by FN6 (default = 1.72 bars) the valve is
de--energised. The valve is de--energised during
regulation (in low speed heat and cool and null -- See
figures 2--14 to 2--17).
3.5.5
Relay operation
D
Engine mode
Automatic start :
Run relay is energized via W1 output.
Diesel/Electric relay is energized via N2 output :
-- Run/stop solenoid is activated in RUN posi-
tion. Fuel pump is energized.
-- Voltage supply to standby motor contactor
and subsequent motor start is prevented.
Glow plugs are energizedvia GPRrelay (T3output).
Then starter solenoid is energized via SSR relay and
T2 output. Engine will crank for 10 seconds or until
engine operation is sensed by the alternator signal (L3).
GPR is de-energized after the auxiliary input is
sensed on. If engine does not start a 15 seconds null
period will elapse before next start attempt. Run relay
(RR) is kept energized.
D
Standby mode
Automatic start :
DER relay is energized via N2 output.
-- Prevents activation of engine run solenoid
and fuel pump.
-- Standby motor contactor is energized.
RR is energized. Electrical power is supplied to the
standby motor for starting.