¶ UNIT DESCRIPTION — COMPONENTS
A: SHUT-OFF DAMPER - EHA
B: ACCESS TO DISTRIBUTION BOX
C: MAIN SUPPLY
D: MAIN SWITCH
E: SHUT-OFF DAMPER - ODA
F: FAN - EXHAUST
G: FILTER - SUPPLY
H: FILTER - EXHAUST
I: FAN - SUPPLY
J: BY-PASS DAMPER
K: BY-PASS ZZT
L: MIXING DAMPER
M: HEAT EXCHANGER NO.2 (HEATING)
N: HEAT EXCHANGER NO.1 (HEATING / COOLING)
A: ETA = exhaust from space
B: SUP = supply to space
C: mixing of exhaust air with supply air
D: fresh air flow
¶ UNIT DESCRIPTION — CONTROL SYSTEM
EC1/EC2 – supply/exhaust EC fan, M1 – actuator of supply damper, M2 – actuator of by-pass damper, M3 – actuator of exhaust damper, M4 – actuator of mixing damper, M5 – actuator of 3-way mixing valve of heater/cooler, dP1 – differential pressure switch for supply filter, dP2 – differential pressure switch for exhaust filter, S1 – temperature sensor for fresh air, S2 – temperature sensor for supplied air, S3 – temperature sensor for exhausted air, S4 – temperature sensor for frost protection of heat exchanger ZZT, S5 – return water temperature sensor of heater/cooler, CP – circulation pump for heater/cooler
EC1/EC2 – supply/exhaust EC fan, M1 – actuator of supply damper, M2 – actuator of by-pass damper, M3 – actuator of exhaust damper, M4 – actuator of mixing damper, M5 – actuator of 3-way mixing valve of cooler, dP1 – differential pressure switch for supply filter, dP2 – differential pressure switch for exhaust filter, S1 – temperature sensor for fresh air, S2 – temperature sensor for supplied air, S3 – temperature sensor for exhausted air, S4 – temperature sensor for frost protection of heat exchanger ZZT, S5 – return water temperature sensor of cooler, CP – circulation pump for cooler