IOMM AGR-1 AGR 070A through 100A 55
MAKING ZONE TERMINAL ADJUSTMENTS
Adjusting Control Settings
1. You can adjust only a flashing number with the ZT. If the number does not flash, that item is a
monitor only item. Adjust Control Settings in Display 1, 2, or 3 as follows:
2.
Press the Mode Selector Button until the green Mode Indicator Light moves next to the word
Adjust.
3.
Press either Display Button 1, 2, or 3 to locate adjustable items, which are indicated by flashing
numbers.
If you continue pressing the display buttons, the dot (
| ) in each display changes positions and the
corresponding number appears.
4.
Press the Up () or Down () Arrow key until you reach the number you want to enter. If you
hold down the Up (
) or Down () Arrow keys, you can speed through the numbers more
quickly.
Press Enter. After you press Enter, the numbers stop flashing for a few seconds. This pause tells
you the ZT has processed your adjustment.
5.
Press any of the Display Buttons to make other adjustments, and repeat Steps 2 and 3.
Adjustable Points
The following McQuay Global Reciprocating Chiller points are adjustable by the Zone Terminal.
Table 17, Adjustable Points
VALUES
TEMPLATE
NAME
FACTORY SETPOINT RANGE
OA/AI3 HiLim SP 80°F 0 to 100°F
OA/AI3 Reset SP -40°F -100 to 100°F
LvgWtr Rband SP 0°F 0 to 15°F
Unoccpd Lvg SP 70°F 40 to 90°F
OA Lockout SP -10°F -20 to 65°F
Lvg Low Lim SP 20°F 20 to 40°F
SoftSta Capcty 50% 0 to 100%
SoftStart Time 2 min 0 to 20 minutes
Zone Terminal Glossary
Lvg Water Temp - Shows the temperature of the water leaving the evaporator.
Evap Pres #1 - Shows the evaporator pressure for refrigerant circuit #1.
Evap Pres #2 - Shows the evaporator pressure for refrigerant circuit #2.
OA/AI3 Input - Reset input signal (Outdoor Air Temp. is standard), non-adjustable
OA/AI3 HiLimSP - Used in algorithm for Outside Air Reset. Adjusts Outdoor Air High Limit
(OAHL)(default is 80°F).
OA/AI3 Reset SP - Used in algorithm for Outside Air Reset. Adjusts Outdoor Air Reset Band
(OARB)(default is -40°F; therefore outdoor air reset is 40-80°F).
Lvg Water SP - Shows the dial adjustment setpoint. Non-adjustable from ZT.
LvgWtr Rbnd SP - Can be adjusted through the ZT, 0° - 15°F (default is 0°F). Used in algorithm for
Outside Air Reset. (For an example of 10°F reset; 45°F Leaving Water Setpoint reset up to
55°F).
Contrl Band SP - Indicates what the Control Band Knob is set at. Non-adjustable from ZT.
Actual Lvg SP - Shows the actual setpoint, including any reset that is occurring.
Unoccpd Lvg SP - Adjustable from 40°F - 90°F (default is 70°F). The setpoint is activated by a
timeclock in unoccupied mode.
OA Lockout SP - Adjustable from -20°F to 65°F (default is -10°F). Shuts the unit off when the
Outside Air reaches the setpoint. (Differential = 5°F).
% Unit Load - Indicates the % of the unit load.
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