23
FORM 160.47-NOM3
YORK INTERNATIONAL
TABLE 4 – REFRIGERANT RELIEF CHARACTERISTICS
COOLER
SINGLE RELIEF VALVE
SHELL
C
C r
OUTLET
LBS. AIR PER MIN.
NPT
B
26.3
35.9
3/4"
C
31.7
35.9
3/4"
D
39.7
63.8
1"
E
51.2
63.8
1"
F
62.4
63.8
1"
CONDENSER
DUAL RELIEF VALVE
SHELL
C
C r
OUTLET
LBS. AIR PER MIN.
NPT
B
24.0
35.9
3/4"
C
28.3
35.9
3/4"
D
34.3
35.9
3/4"
E
41.2
63.8
1"
F
53.6
63.8
1"
Notes:
1). Dual relief valve consists of one three-way shut off valve and two single relief valves. The valve configuration will not allow
both valves to be shut off at the same time, and valves are sized such that each relief valve has sufficient discharge capacity
when used alone. This permits safe removal of either relief valve for repair or replacement, while maintaining vessel protection.
2). ASHRAE 15-1994 Section 9.8 and Appendix F describes relief requirements for positive displacement compressors. Summa
rized, the unit must be equipped with a relief device suitable for relieving the entire compressor capacity. YORK YS mod D (S0 -
S5 compressor) units utilize a 2" rupture disk venting to atmosphere set at 345 psid. [See note 3 for S7 units.]
Where:
C = Min. required discharge capacity
Cr = Rated capacity of York supplied relief valve @
300 psig or rupture disk at 345 psig
Relief valve set pressure - 300 psig.
Rupture disk set pressure - 345 PSIG.
UNIT PIPING
Compressor lubricant piping and system refrigerant pip-
ing are factory installed on all units shipped assembled.
On units shipped dismantled, the following piping should
be completed under the supervision of the York repre-
sentative; the lubricant piping; system oil return using
material furnished. See Form 160.47-N3.1
CONTROL WIRING
After installation of the control center or units shipped
disassembled, the control wiring must be completed be-
tween unit components and control center or solid state
starter when used, using the wiring harness furnished.
Field wiring connections for commonly encountered
control modifications (by others), if required, are shown
on Wiring Diagram, Form 160.47-PW5.
No deviations in unit wiring from that
shown on drawings furnished shall be
made without prior approval of the
York Representative.
POWER WIRING
UNIT WITH ELECTRO-MECHANICAL STARTER
A 115 volt – single-phase – 60 or 50 Hertz power sup-
ply of 15 amperes must be furnished to the control cen-
ter, from the optional control transformer (1-1/2 kVa
required) included with the compressor-motor starter.
DO NOT make final power connections to control cen-
ter until approved by York Representative. Refer to Form
160.47-PW11.
1
* Single relief valve
OIL SEPARATOR (R-22)
RELIEF VALVE
RUPTURE DISK
COMPRESSOR
C
C r
DUAL (1)
C R
SINGLE
CODE
LBS. AIR PER MIN. OUTLET NPT #AIR/MIN. OUTLET NPT
S0, S1 (2)
24.0
35.9
*3/4"
511.0
2"
S2, S3 (2)
28.3
35.9
3/4"
764.0
2"
S4 (2)
33.3
63.8
1"
1008.0
2-1/2"
S5 (2)
33.3
63.8
1"
1275.0
2-1/2"
OIL SEPARATOR (R-134a)
RELIEF VALVE
RUPTURE DISK
COMPRESSOR
C
C r
DUAL (1)
C R
SINGLE
CODE
LBS. AIR PER MIN. OUTLET NPT #AIR/MIN. OUTLET NPT
S0, S1 (2)
24.0
35.9
*3/4"
511.0
2"
S2, S3 (2)
28.3
35.9
3/4"
511.0
2"
S4 (2)
33.3
63.8
1"
764.0
2-1/2"
S5 (2)
33.3
63.8
1"
1008.0
2-1/2"
