York YDAJ87HU7, Manual

Page: 88 / 100

YORK INTERNATIONAL
88
SYS. FAN CONTACTORS ON OFF
1 1 & 3 REV 9M & 10M
320 PSIG 120 PSIG
3 9 & 11 REV* 9M & 10M
1 2 & 4 6M & 8M
340 PSIG 120 PSIG
3 10 & 12 6M & 8M
1 1 & 3 FWD 5M & 7M
360 PSIG 140 PSIG
3 9 & 11 FWD 5M & 7M
2 5 & 7 REV* 15M & 16M
320 PSIG 120 PSIG
4 13 & 15 REV* 15M & 16M
2 6 & 8 12M & 14M
340 PSIG 120 PSIG
4 14 & 16 12M & 14M
2 5 & 7 FWD 11M & 13M
360 PSIG 140 PSIG
4 13 & 15 FWD 11M & 13M
* Optional Low Ambient
FIELD INSTALLATION
If it becomes necessary to field install the Hot Gas
(Loadminder) Option, two kits are required. The part
numbers of the kits are 375-04249-000 and 471-01232-
101. The 471-01232-101 kit consists of a second Relay
Output Board. It is not required if two Relay Boards are
already installed in the control panel. If the 375-04249-
001 kit is not available, the following parts should be
ordered separately.
DISCHARGE PRESSURE READ-OUT OPTION
The Discharge Pressure Read-out Option P/N 471-
01232-131 (Master Module) and 471-01232-136 (Slave
Module) allows the user to obtain control panel displays
of discharge pressure. Additionally, other displays such
as fault information will then hold relevant discharge
pressure information useful in diagnosing problems.
The Discharge Pressure Unloading feature also be-
comes usable when this option is installed (Page 46)
as well as fan cycling by discharge pressure.
Fan cycling by discharge pressure sometimes becomes
necessary, if ambient temperature cycling of fans causes
low suction pressure faults due to unusual operating
conditions or chiller location problems. Fan cycling by
discharge pressure only, allows higher discharge pres-
sures which in turn raises suction pressure by permit-
ting better operation of the thermal expansion valve. To
convert to discharge pressure cycling, the micro panel
must be programmed for DISCHARGE PRESSURE
FAN CONTROL (See Page 40). Fan cycling will oper-
ate as indicated in Table 3.
The kit consists of discharge pressure transducers for
each system, wire harnesses, and associated mount-
ing hardware.
HIGH AMBIENT OPTION
The High Ambient Option consists of four kits, P/N’s
471-01232-131 for the Master Module, 471-01232-136
for the Slave Module, and (2) 475-04250-000 Sunshield
kits. The option allows operation of the chiller in ambi-
ents up to 115°F. Typically, standard operation is lim-
ited to 105°F. High ambient operation is accomplished
by discharge pressure unloading to assure that the
chiller does not fault due to the high pressure cut-out
opening during high temperate operation. A sun shield is
also installed on the both control panels to prevent di-
rect sunlight from overheating the control panel caus-
ing subsequent malfunction of the electro-mechanical
TABLE 3 – FAN CYCLING
LD01951
FIG. 48 – PIPING DIAGRAM
ITEM QTY PART # DESCRIPTION
1 1 375-00431-025 SOL. VALVE
2 1 375-00431-026 SOL. VALVE
3 2 075-03742-000 SUPPORT
4 1 075-04281-000 PIPE CONN.
5 4 066-83964-000 CLAMP
6 2 075-04286-000 PIPE CONN.
7 4 066-88928-000 CLAMP
8 4 023-00200-000 REDUCER
9 1 075-04200-000 PIPE CONN.
10 1 075-04283-000 PIPE CONN.
11 1 075-04202-000 PIPE CONN.
12 1 075-03781-000 PIPE CONN.
13 1 075-04284-000 PIPE CONN.
14 4 021-16161-000 SCREW
15 20 021-16136-000 SCREW
16 4 021-16210-000 LOCKWASHER
17 2 023-08576-000 TEE
18 4 021-16151-000 HEX NUT
19 2 023-09743-000 E11
20 1 075-04285-000 TUBING
22 1 075-04282-000 PIPE CONN.
23 2 031-01117-000 SUPPRESSOR
24 2 023-05299-000 CLAMP
25 2 021-08381-000 SCREW
26 2 021-00451-000 HEX NUT
27 2 021-01148-000 LOCKWASHER
30 1 075-04201-000 PIPE CONN.
32 5 023-00061-000 COUPLING
33 4 075-04519-000 BRACKET
XX 1 075-04249-000 DRAWING