York eco2 055, Installation Operation & Maintenance

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7
YORK INTERNATIONAL
FORM 100.50-NOM1 (604)
ACRONYM CHART
ACRONYM TEXT ACRONYM TEXT
APS Air Proving Switch oah Outside Air Humidity
ascd Anti-Short Cycle Delay occ Occupied
ams Air Measurement Station p Purge
aq Air Quality (CO2) pe Power Exhaust Output
bs Building Static ra Return Air
cor Cooling / Heating Changeover Relay rat Return Air Temperature
cp1 – cp3 Condensing Pressure Circuit 1
Through 3 rah Return Air Humidity
cs1 – cs3 Compressor Circuit 1 Through 3 rdu Remote Display Unit
cv Constant Volume sat Supply Air Temperature
dfs Dirty Filter Switch sf Supply Fan
ds Duct Static Pressure ss Space Sensor
dvm Demand Ventilation Multiplier ssa Space Setpoint Adjust
ead Exhaust Air Damper smk Smoke Purge
ec Economizer sp1 – sp3 Suction Pressure Circuit 1 Through 3
edat Evaporator Discharge Air
Temperature st Space Temperature
ef Exhaust Fan stg1 – stg6 Cooling/Heating Stage 1 Through 6
estop Emergency Stop unocc Unoccupied
fs Freeze Stat (HW/Steam) vav Variable Air Volume
g Thermostat Input for the Fan vfd Variable Frequency Drive
hw Hot Water w1 Thermostat Input For The First Stage of
Heating
mit Modular Integrated Terminal w2 Thermostat Input For The Second Stage of
Heating
mitd MIT Bypass Damper
oa Outdoor Air y1 Thermostat Input For The First Stage of
Cooling
oad Outside Air Damper y2 Thermostat Input For The Second Stage of
Cooling
oat Outside Air Temperature ydc YORK Digital Controller
Fig. 34 – Minimum Flow Measurement Option,
Economizer Sequence.................................68
Fig. 35 – Full Flow Measurement Arrangement ........68
Fig. 36 – Full Flow Measurement Option, Econ o miz er
Not Avail able ..............................................69
Fig. 37 – Full Flow Measurement Option Economizer
Sequence .....................................................69
Fig. 38 – Low Ambient Hardware .............................71
Fig. 39 – Condensing Pressure Control Proportional
Band............................................................71
Fig. 40 – OAD Position Control ................................73
Fig. 41 – Building Pressure Control...........................73
Fig. 42 – Exhaust Proportional Band .........................74 Fig. 43 – Exhaust Fan Control, Pro por tion al
Option .........................................................74
Fig. 44 – Modulating Gas Heat Staging.....................80
Fig. 45 – By-Pass Damper Formulas .........................83
Fig. 46 – By-Pass Damper Setpoints .........................84
Fig. 47 – ODA Damper Position vs. VAV Sup ply Fan
Output .......................................................101
Fig. 48 – Primary Unit Controller............................ 116
Fig. 49 – Primary Unit Controller Connection Map 117
Fig. 50 – Binary LED Designations......................... 118
Fig. 51 – MOD-UNT ...............................................125
Fig. 52 – MOD-UNT Wiring Diagram ....................125
Fig. 53 – Thermostat Interface Board ......................128