Wellea
M
onobloc
15
P
art
3
- Con
tr
ol
3
Startup Control
3.1
Compressor Startup Delay Control
In initial startup control and in restart control (except in oil return operation and defrosting operation), compressor startup
is delayed such that a minimum of the set re-start delay time has elapsed since the compressor stopped, in order to
prevent frequent compressor on/off and to equalize the pressure within the refrigerant system. The compressor re-
start delays for cooling and heating modes are set on the user interface. Refer to the
Wellea
Mono Engineering Data Book
Part 3, 7.5 “COOL MODE SETTING Menu” and Part 3, 7.6 “HEAT MODE SETTING Menu”.
3.2
Compressor Startup Program
In initial startup control and in re-start control, compressor startup is controlled according to outdoor ambient
temperature. Compressor startup follows one of two startup programs until the target rotation speed is reached. Refer to
Figures 3-4.1, 3-4.2 and 3-4.3.
Figure 3-4.1: Compressor startup program
1,2
when ambient temperature is above 4°C
38rps
Target rotation speed
Compressor rotation
speed (rps)
Time (s)
0
32rps
42rps
56rps
66rps
86rps
40s
60s
40s
40s
40s
40s
Notes:
1.
Once the first, 40-second stage of the program is complete, the program proceeds to the subsequent stages in
a step-by-step fashion and exits when the target rotation speed has been reached.
2.
This program is used on all
Wellea
Mono models: 5kW to 16kW, single phase and three phase.
Figure 3-4.2:
For 5/7/9kW
compressor startup program
1
when ambient temperature is at or below 4°C
Target rotation speed
Compressor rotation
speed (rps)
40s
38rps
90s
32rps
60s
42rps
40s
56rps
40s
66rps
40s
82rps
Time (s)
0
90s
36rps
Notes:
1.
Once the first, 40-second stage of the program is complete, the program proceeds to the subsequent stages in a
step-by-step fashion and exits when the target rotation speed has been reached.
