FORM 150.60-NM4
YORK INTERNATIONAL 77
MODEL NO. PART NO. MODEL NO. PART NO.
YEA FIELD MOUNTED YEA FIELD MOUNTED
Z88DR6-17P 471-01262-102 J65ES7-50P 471-01262-102
Z88DR6-28P 471-01262-102 J54ES6-58P 471-01262-102
Z88DR6-40P 471-01262-102 J65ES7-64P 471-01262-102
Z88DR6-46P 471-01262-102 J55HT8-17P 471-01262-101
J44DR7-50P 471-01262-102 J55HT8-28P 471-01262-101
Z88DR6-58P 471-01262-102 J55HT8-40P 471-01262-102
J44DR7-64P 471-01262-102 J55HT8-46P 471-01262-102
J44DR6-17P 471-01262-102 J66HT9-50P 471-01262-102
J44DR6-28P 471-01262-102 J55HT8-58P 471-01262-102
J44DR6-40P 471-01262-102 J66HT9-64P 471-01262-102
J44DR6-46P 471-01262-102 J65HT8-17P 471-01262-101
J44DR7-50P 471-01262-102 J65HT8-28P 471-01262-101
J44DR6-58P 471-01262-102 J65HT8-40P 471-01262-102
J55DR7-64P 471-01262-102 J65HT8-46P 471-01262-102
J44HT6-17P 471-01262-102 J76HT9-50P 471-01262-102
J44HT6-28P 471-01262-102 J65HT8-58P 471-01262-102
J44HT6-40P 471-01262-102 J76HT9-64P 471-01262-102
J44HT6-46P 471-01262-102 J66MT8-17P 471-01262-101
J55HT7-50P 471-01262-102 J66MT8-28P 471-01262-101
J44HT6-58P 471-01262-102 J66MT8-40P 471-01262-102
J55HT7-64P 471-01262-102 J66MT8-46P 471-01262-102
J54ES6-17P 471-01262-102 J77MT9-50P 471-01262-102
J54ES6-28P 471-01262-102 J66MT8-58P 471-01262-102
J54ES6-40P 471-01262-102 J77MT9-64P 471-01262-102
J54ES6-46P 471-01262-102
LOW AMBIENT KIT
Components
The Low Ambient Option consists of 3 kits; a Low Ambi-
ent Kit for the appropriate chiller from the list below, a
471-01262-111 Discharge Pressure Readout Kit, and also
a 471-01232-101 Relay Board Kit. All three kits are re-
quired. The Relay Board Kit is not required if two Relay
Boards are already present in the panel.
When the Low Ambient Option is installed, the following
physical changes are made to the standard chiller:
1. Discharge pressure transducers and wiring are added.
2. Reversing contactors 7M and 10M with supporting wir-
ing are added.
3. A second Relay Output Board and wiring is installed.
Programming
The control panel may be programmed for AMBIENT &
DISCH PR FAN CONTROL (Ambient & discharge pres-
sure fan control) or by DISCHARGE PRESSURE FAN
CONTROL (fan control by discharge pressure only). This
is selected by placing SW. 8 on the microprocessor to
the appropriate position. See page 30.
SW. 2 on the microprocessor board must also be pro-
grammed for LOW AMBIENT CONTROL to allow op-
eration at temperatures below 25°F. To accomplish
this, place SW. 2 in the CLOSED position. See page
28. After the switch is properly positioned, the OUT-
SIDE AIR TMP LOW CUT-OUT in the PROGRAM
mode can then be programmed between 0° - 25°F.
See page 36.
NOTE: For operation below 0°F, program the cut-out for
0°F. This will cause the microprocessor to ig-
nore the low ambient cut-out regardless of tem-
perature.
Operation of the fans will be discussed in both Ambient
and Pressure Control as well as Pressure Only con-
trol in the following text.
Ambient and Pressure Fan Control
0°F - 25°F
Fan operation on each system below 25°F is controlled
only by the discharge pressure of the respective sys-
tem. Each system will operate 4 steps of fan control as
follows:
1. Until discharge pressure reaches 320 PSIG, the fans
will be completely off.
2. The second stage of fan control will energize fan 1
(SYS 1, 7M) or fan 3 (SYS 2, 10M) in the reverse
direction when the discharge pressure exceeds 320
PSIG. Once the reversing contactor is energized, it
will stay on until the discharge pressure of either sys-
tem falls below 120 PSIG, the ambient temperature
exceeds 35°F, or discharge pressure of the system
rises above 340 PSIG.
NOTE: The corresponding compressor must be on for
a minimum of 4 sec. before the reversing fans
are permitted to start.
3. The third stage of fan control will energize fan 2 (SYS
1, 6M) or fan 4 (SYS 2, 9M) as well as turn off the
reversing fans on the respective system whenever dis-
charge pressure exceeds 340 PSIG. This fan will stay
on until discharge pressure of either system drops
below 120 PSIG.
NOTE: The corresponding compressor must be on for
4 sec. before these fans are permitted to start.
4. The fourth stage of fan control will energize fan 1 (SYS
1, 5M) or fan 3 (SYS 2, 8M) and will operate the cor-
responding fans in the forward direction whenever dis-
charge pressure exceeds 360 PSIG. This fan will stay
on until discharge pressure of either system drops
below 140 PSIG.
NOTE: The corresponding compressor must be on for
4 sec. before these fans are permitted to start.
To Next Page
Loading...
