Table 18: Compressor Numbering; Table 19: Compressor Layout - York Sun Premier GZA1M Series Start-Up & Operation

Table 18: Compressor Numbering

Unit Left Position
25 Ton
30 Ton
40 Ton
50 Ton
25 Ton
30 Ton
40 Ton
50 Ton
25 Ton
30 Ton
40 Ton
50 Ton
NOTES:
1. Facing the compressor end.
2. Not available.
3. On 40 and 50 ton high efficiency units ONLY, the left position compressor is 1B and the mid-left compressor is 1A.

Table 19: Compressor Layout

Compressor
Combination
Manufacturer
25T SE Copeland Single
30T SE Copeland Tandem
40T SE Copeland Tandem
50T SE Copeland Tandem
25T HE Copeland VSD Single
30T HE Copeland VSD Single
40T HE Danfoss VSD Tandem
50T HE Danfoss VSD Tandem
25T HC Copeland Single
30T HC Copeland Tandem
40T HC Copeland Tandem
50T HC Copeland Tandem
NOTES:
VSD = Variable Speed Drive SE = Standard Efficiency HE = High Efficiency HC = High Capacity NA = Not Available
VSD Tandem = Comp 1A is VSD and Comp 1B is single speed
Single Speed Compressors
The rooftop units include single speed scroll compressors
as the standard offering. The single speed scroll compres-
sors can either be standalone or part of a tandem set.
Single speed scroll compressors are staged ON/OFF
to achieve and maintain the active DAT cooling set-
point. The unit controller contains logic that prevents
short-cycling of the compressors and also prevents
overshooting the active DAT cooling setpoint.
YORK
Mid-Left Position
1
1A NA
1A 1B
1A 1B
1A 1B
1A NA
1A NA
1B 1A
3
1B 1A
3
1A NA
1A 1B
1A 1B
1A 1B
Refrigerant Ckt 1
Comp 1A Comp 1B
HP HP
10 NA
7 7
11.5 5.5
7.5 15
13 NA
18.5 NA
13 10
17.5 12
10 NA
8.5 5.5
13 7
8.5 15
Start-Up & Operation Guide | 5587001-YSG-A-520
Mid-Right Position
1
2A
2
2A
2A
2A
2A
2
2A
2
2A
3
2A
3
2A
2
2A
2A
2A
Total Capacity
Combination
Ckt 1
10.0 Tandem
14.0 Tandem
17.0 Tandem
22.5 Tandem
13.0 Tandem
18.5 Tandem
23.3 Tandem
29.5 Tandem
10.0 Tandem
14.0 Tandem
20.0 Tandem
23.5 Tandem
Variable Speed Compressors
The rooftop units can have a variable speed compres-
sor factory installed as an option. If a variable speed
compressor is ordered, it is always installed on refrig-
eration circuit #1 (compressor 1A). All other compres-
sors are single speed.
The variable speed compressor is always the first com-
pressor ON and the last compressor OFF.
The variable speed compressor is controlled by a fac-
tory installed VFD. The VFD is selected by the com-
pressor manufacturer and all programming is complet-
ed at the factory.
Right Position
1
2B
2B
2B
2B
2B
2B
2B
2B
2B
2B
2B
2B
Refrigerant Ckt 2
Comp 2A Comp 2B Total Capacity
HP HP Ckt 2
4.5 7 11.5
5.5 7.5 13.0
10 8.5 18.5
11.5 10 21.5
5 7.5 12.5
7 7 14.0
7.5 7.5 15.0
10 10 20.0
5 7.5 12.5
7 7 14.0
10 8.5 18.5
7.5 15 22.5
1
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