Metasys Ventilation Controller
16
Checking the Solenoid Valves
To check the solenoid valves:
1.
Listen to the valves. They produce an audible click when changing
states. This should happen approximately every sixty seconds.
2.
Time the changes in the valves. Are the solenoid valves changing
state in the proper sequence (as detailed in Table 3)?
Table 3: Commanded States of Solenoid Valves Relative to
Air Sampling Sites
Air Sampling Site Solenoid 1 Solenoid 2
Outdoor air
On Off
Supply air
Off On
Return air
Off Off
Note:
For more information, consult the Timing and Staging
diagrams in the CO
2
Multiplexer Application Note
(LIT-636212) located in the Metasys Network Technical
Manual (FAN 636).
Calculating the OA Flow
To calculate the outdoor air flow:
1.
Wait ten minutes after initial startup or until the system appears to
have stabilized (when one CO
2
value is measured every minute).
2.
After system has stabilized, verify that the CO
2
levels coordinate
with the following equation:
[OA CO
2
] ≤ [SA_CO
2
] ≤ [RA_CO
2
]
Note:
For more information, consult the Outdoor Air Flow
Calculator Application Note (LIT-636222) located in the
Metasys Network Technical Manual (FAN 636).
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