York eco2 050 Installation Operation & Maintenance page 7

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
ACRONYM TEXT
APS Air Proving Switch
ascd Anti-Short Cycle Delay
ams Air Measurement Station
aq Air Quality (CO2)
bs Building Static
cor Cooling / Heating Changeover Relay
cp1 - cp3 Condensing Pressure Circuit 1
Through 3
cs1 - cs3 Compressor Circuit 1 Through 3
cv Constant Volume
dfs Dirty Filter Switch
ds Duct Static Pressure
dvm Demand Ventilation Multiplier
ead Exhaust Air Damper
ec Economizer
edat Evaporator Discharge Air
Temperature
ef Exhaust Fan
estop Emergency Stop
fs Freeze Stat (HW/Steam)
g Thermostat Input for the Fan
hw Hot Water
mit Modular Integrated Terminal
mitd MIT Bypass Damper
oa Outdoor Air
oad Outside Air Damper
oat Outside Air Temperature
YORK INTERNATIONAL
Fig. 43 - Exhaust Fan Control, Pro por tion al
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
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
ACRONYM CHART
ACRONYM
oah
occ
p
pe
ra
rat
rah
rdu
sat
sf
ss
ssa
smk
sp1 - sp3
st
stg1 - stg6
unocc
vav
vfd
w1
w2
y1
y2
ydc
FORM 100.50-NOM1 (604)
Option .........................................................74
Output ....................................................... 101
TEXT
Outside Air Humidity
Occupied
Purge
Power Exhaust Output
Return Air
Return Air Temperature
Return Air Humidity
Remote Display Unit
Supply Air Temperature
Supply Fan
Space Sensor
Space Setpoint Adjust
Smoke Purge
Suction Pressure Circuit 1 Through 3
Space Temperature
Cooling/Heating Stage 1 Through 6
Unoccupied
Variable Air Volume
Variable Frequency Drive
Thermostat Input For The First Stage of
Heating
Thermostat Input For The Second Stage of
Heating
Thermostat Input For The First Stage of
Cooling
Thermostat Input For The Second Stage of
Cooling
YORK Digital Controller
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