Fan Control - Carrier 38VMA Series Service Manual

Table 15 - EXV A, EXV B (38VMA144HDS)
Capacity
Initial pulse step
Normal control
Table 16 - EXV C
Electronic Expansion Valve
Normal control
NOTE:
Completely open position of electronic expansion valve (EXV) is 480P.
When the compressor ramps up, EXV will be at initial pulse step for 4 minutes, and then the EXV will be adjusted according to
the maximum discharge temperature.
The system will check the maximum discharge temperature every 2 minutes.
Fan Steps

4. Fan Control

Table 17 -
Fan Steps
0
1
2
3
4
5
6
7
8
9
10
11
12 (standard 0pa)
13 (20pa)
14 (40pa)
15 (60pa)
1—15
120P
EXV C
0P
38VMA072, 096HDS
0 / 0
250 / 0
330 / 0
250 / 250
330 / 330
410 / 410
460 / 460
530 / 530
580 / 580
660 / 660
710 / 710
760 / 760
800 / 800
870 / 870
980 / 890
1010 / 930
16—30
250P
Rotating Speed
38VMA120HDS
0 / 0
250 / 0
330 / 0
250 / 250
330 / 330
410 / 410
460 / 460
530 / 530
580 / 580
660 / 660
710 / 710
800 / 800
850 / 850
870 / 870
980 / 890
1010 / 930
31—48
380P
38VMA144HDS
0 / 0
250 / 0
330 / 0
250 / 250
330 / 330
410 / 410
460 / 460
530 / 530
580 / 580
660 / 660
710 / 710
800 / 800
980 / 890
980 / 890
980 / 890
1010 / 930
29