Specifications

VCES-ERV-IOM-1A – ERV500i/e
25
Unoccupied Recirc Contacts (ERV500i only)
On recirc defrost units, an unoccupied recirc control can
be achieved by connection to the terminal interface shown
below. These terminals require a 24 VAC signal which
could be provided by a timer, thermostat or other. Closure
of these terminals will cause the unit to go into a recirc
mode where the supply fan runs on high speed and the
exhaust fan stops.
Smoke Detector
Locate in a normally occupied area of premises. Recom-
mended for compliance to NFPA-90A and IMC code 606.
ERVs can be equipped with a duct mount smoke detector
which will monitor the air when passing through the duct
system into the ERV. When sufficient smoke is detected,
an alarm condition is activated. By connecting the occu-
pied timer/sensor contacts to the NC alarm auxiliary con-
tacts on the duct sensor, an alarm condition will open the
auxiliary contact and stop operation of the ERV.
IMPORTANT
Although these contacts are intended for use during
unoccupied periods, they are still active during an occu-
pied condition. Therefore, the 24 VAC signal should be
applied such that it is disabled during occupied periods,
preventing the unit from going into a recirc condition un-
necessarily.
CONTROL CONTACTS
CLASS 2 VOLTAGE
WALL CONTROL
BLACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NOTE:
Connections are all dry contacts
except wall control, wheel alarm
contacts and 24 VAC power contacts.
Use of 24 VAC circuit requires
isolating contacts (ex. thermostat)
to prevent interconnection of
Class 2 outputs.
RED
OCCUPIED
TIMER/
SENSOR
FIELD WIRED
TERMINALS
AB
UNOCC.
RECIRC
CONTACTS
LOW
COMMON
HIGH
DIRTY
FILTER
INDICATOR
(1.5A–24 VAC)
(ERV UNITS)
WHEEL
ALARM
OPTION
(24 VAC)
(ERV UNITS)
ENTHALPY
(−) 24 VAC
(40 VA)
(+) 24 VAC
GREEN
YELLOW
(RECIRC UNITS)
Note: Unoccupied recirculation
is available on units with
recirculation defrost option only.
24 VAC
required
Figure G10: Unoccupied recirc contacts
AVAILABLE POWER INPUTS
1 2 12 13 14
24V
120
VAC
220/240
VAC
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
15 16 17 18 19 20
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.
N.C. C. N.O.
N.O.
C.
N.C.
8
9
N.O.
TROUBLE CONTACTS CLOSED IN ALARM AND
STANDBY. CONTACTS OPEN WHILE DETECTOR
HEAD OR POWER IS REMOVED, AND DURING
RESET. OPEN CONTACTS SIGNAL TROUBLE
CONDITION TO PANEL.
2 ALARM 5
1 COMMON 6
7
10
3 POWER 11
(+) ALARM SIGNAL
(D) AUX POWER
(+) AUX POWER
TROUBLE
CONTACTS
FIELD
INSTALLED
JUMPER
GRN.
RED
POWER INPUTS ACCEPT
24 VDC, 24 VAC 50–60 HZ,
120 VAC 50–60 HZ, OR
220/240 VAC 50–60 HZ.
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR.
ALARM AUXILIARY CONTACT RATINGS
10A @ 30 VDC
10A @ 250 VAC (0.75 POWER FACTOR)
240VA @ 240 VAC (0.4 POWER FACTOR)
1/8 HP @ 120 VAC
1/4 HP @ 240 VAC
500mA MINIMUM @ 24 VDC
NOT INTENDED FOR CONNECTION
TO CONTROL PANELS.
ALARM INITIATION CONTACT RATING
2.0A @ 30 VAC/DC (0.6 POWER FACTOR)
TROUBLE CONTACT RATING
0.3A @ 32 VAC/DC
TROUBLE CONTACTS CLOSED IN
STANDBY AND ALARM. CONTACTS
OPEN WHILE DETECTOR HEAD OR
POWER IS REMOVED, AND DURING
RESET. OPEN CONTACTS EXTINGUISH
OPTIONAL APA451 GREEN POWER
LED TO INDICATE TROUBLE CONDITION.
CONTROL CONTACTS
CLASS 2 VOLTAGE
WALL CONTROL
BLACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NOTE:
Connections are all dry contacts
except wall control, wheel alarm
contacts and 24 VAC power contacts.
Use of 24 VAC circuit requires
isolating contacts (ex. thermostat)
to prevent interconnection of
Class 2 outputs.
RED
OCCUPIED
TIMER/
SENSOR
FIELD WIRED
TERMINALS
AB
UNOCC.
RECIRC
CONTACTS
LOW
COMMON
HIGH
DIRTY
FILTER
INDICATOR
(1.5A–24 VAC)
(ERV UNITS)
WHEEL
ALARM
OPTION
(24 VAC)
(ERV UNITS)
ENTHALPY
(−) 24 VAC
(40 VA)
(+) 24 VAC
GREEN
YELLOW
(RECIRC UNITS)
ALARM INITIATION CONTACTS
Figure G11: Smoke detector