26 Flexvent™ installation manual
WIRING DIAGRAM & SCHEMATIC
ADDITIONAL NOTES:
PIN 1: INPUTS 120VAC, L1 TO USER INTERFACE. ALWAYS LIVE UNLESS ANSUL
SYSTEM IS ACTIVATED.
PIN 2: INPUTS 120VAC, L1 TO USER INTERFACE WHEN SYSTEM DETECTS LOW
PRESSURE. SYSTEM WILL DETECT LOW PRESSURE ON STARTUP UNTIL FAN IS UP
TO SPEED AND PRESSURES ARE NORMAL. USER INTERFACE NEEDS TO APPLY
ONE MINUTE DELAY BEFORE DISPLAYING LOW PRESSURE.
PIN 3: OUTPUTS 120VAC, L1 WHEN SYSTEM START IS PRESSED TO ENGAGE T1. PIN
4: INPUTS 120VAC, L1 TO USER INTERFACE WHEN SYSTEM DETECTS HIGH
PRESSURE. THIS IS LIVE ONLY FOR A SHORT TIME BECAUSE WHEN MOTOR
SHUTS DOWN THE PRESSURE IMMEDIATELY DROPS. SO THE HIGH PRESSURE
DISPLAY WILL NEED TO BE "LATCHED" AND STAY ON UNTIL CONTROL IS RESET
(POWER OFF).
PIN 5: INPUTS 120VAC, L1 FROM PS1, HIGH PRESSURE SWITCH.
PIN 6: OUTPUTS 120VAC, L1 FROM PIN 5 WHEN SYSTEM START IS PRESSED.
PIN 7: INPUTS NEUTRAL TO THE USER INTERFACE.
PIN 8: OUTPUTS 120VAC, L1 TO OPTIONAL LED POWER SUPPLY.
PIN 9: INPUTS GROUND TO THE USER INTERFACE.
S1 = ANSUL SWITCH
WHEN ANSUL SYSTEM IS ACTIVATED, ANSUL SWITCH (S1) OPENS,
DE-ENERGIZING USER INTERFACE.
R1 = FAN RELAY
ENERGIZED IF ANSUL SWITCH (S1) IS CLOSED, AND FAN RELAY (R1) IS
ACTIVATED OR PRESSURE BEHIND FILTERS IS BETWEEN -0.9PS AND
-1.1PS.
R2 = POWER RELAY
ENERGIZED WHEN (R4) IS CLOSED.
R3 = FAN START RELAY
ENERGIZED (CLOSED) WHEN START IS PRESSED (WILL DE-ENERGIZE
ON SUBSEQUENT PRESS OF START). DELAY OPEN ON LOW
PRESSURE FAULT, 220 SECONDS NO OPEN DELAY ON HIGH
PRESSURE FAULT.
R4 = POWER RELAY
ENERGIZED WHEN START IS PRESSED (WILL DE-ENERGIZE ON
SUBSEQUENT PRESS OF START). NO OPEN DELAY ON HIGH OR
LOW PRESSURE FAULT.
R5 = LIGHT RELAY
ENERGIZED WHEN LIGHT IS PRESSED (WILL DE-ENERGIZE ON
SUBSEQUENT PRESS OF LIGHT).
PS1 = PRESSURE SWITCH, HIGH NEGATIVE (DETECTING MAXIMUM
ALLOWABLE NEGATIVE PRESSURE)
WHEN NEGATIVE PRESSURE REACHES SETPOINT OF -1.1PS
(INDICATING AIR-FLOW BLOCKAGE), THE PRESSURE SWITCH (PS1)
DISCONNECTS POWER TO R2 POWER RELAY AND PROVIDES
SIGNAL POWER TO USER INTERFACE.
PS2 = PRESSURE SWITCH, LOW NEGATIVE (DETECTING MINIMUM
ALLOWABLE NEGATIVE PRESSURE)
WHEN NEGATIVE PRESSURE REACHES SETPOINT OF -0.9PS
(INDICATING AT LEAST MINIMAL AIR FLOW IS ACHIEVED) THE
PRESSURE SWITCH (PS2) MAINTAINS POWER TO R2 POWER RELAY
AS LONG AS MINIMUM PRESSURE IS SATISFIED AND ANSUL SWITCH
(S1) IS CLOSED (NOT ACTIVATED).
T1 = TIMER, NORMALLY CLOSED ON POWER, TIMED OPEN
TIMER (T1) IS ACTIVATED WHEN SIGNAL POWER IS RECEIVED FROM
USER INTERFACE AND MAINTAINS CLOSURE OF CONTROL RELAY
(R1) FOR PRESET TIME (60 SECONDS). THIS ALLOWS THE SYSTEM
TIME TO STABILIZE AT OPERATING PRESSURE.
M1 = FAN MOTOR
RUNS WHEN CONTROL RELAY (R1) IS CLOSED.
CB1 = MAIN OUTPUT BREAKER
FEEDS MAIN POWER TO CUSTOMER SUPPLIED
DISTRIBUTION BREAKER BOX AND OUTLETS.
