Figure 2.8, Electrical wiring diagram, Figure 2.9 – AERCO KC1000 Heater w/Mod-Box Controller User Manual
Page 12: Field control wiring box location, Figure 2.10, Field control box wiring, Installation procedures, 2 the fault relay, Field control gas shut-off valve blower box wiring
INSTALLATION PROCEDURES
7
Figure 2.8
Electrical Wiring Diagram
2.6 FIELD CONTROL WIRING
Each unit is fully wired from the factory with an
internal operating control system. No field control
wiring is required for normal operation. However
a fault relay, for remote fault indication, and
enable/disable interlock circuits are provided.
Wiring for these circuits can be accomplished in
the Field Control Wiring Box behind the left side
panel (see Fig. 2.9).
BMS
SHIELD
FAULT
SWITCH
5
6
-
+
4
1
2
3
13
4-20 mA
+
14
12
10
11
9
EXH .
TEMP.
START
IN DIC ATION
AERCO INTERNATIONAL INC.
FIELD WIRING
7
8
16
15
AIR
SEN SOR
OUTDOOR
FIELD
CONTROL
GAS SHUT-OFF VALVE
BLOWER
BOX
WIRING
Figure 2.9
Field Control Wiring Box Location
2.6.1 ENABLE/DISABLE INTERLOCK
Each unit has an enable/disable interlock circuit
located in the field wiring box (see Figure 2.10).
This interlock must be closed,(jumped), to allow
the unit to fire. When the interlock is open, the
control panel Annunciator will display
'INTERLOCK DISABLED' and the unit will not
fire. The unit comes factory wired with the
interlock closed.
2.6.2 THE FAULT RELAY
The fault relay is a single pole single throw relay,
that is energized upon any fault condition. The
relay will remain energized until the fault is
cleared and the CLEAR button is pushed The
normally open field connections are shown in
Figure 2.10. The relay contacts are rated for 5
amps at 250 VDC and 5 amps at 30 VDC.
Figure 2.10
Field Control Box Wiring
2.7 FLUE GAS VENT INSTALLATION
AERCO Gas Fired Venting and Combustion Air
Guide, GF-1050, must be consulted before any
flue or combustion air venting is designed or
installed. Suitable, U/L approved, positive
pressure, watertight vent materials MUST be
used for safety and UL certification. Because
the unit is capable of discharging low
temperature exhaust gases, the flue must be
pitched back towards the unit a minimum of 1/4"
per foot to avoid any condensate pooling and to
allow for proper drainage.
While there is a positive flue pressure during
operation, the combined pressure drop of vent
and combustion air systems must not exceed
140 equivalent feet of 0.81” W.C. Fittings as
well as pipe lengths must be calculated as part