Optional Auxiliary Wall Controls Operation; Electrical Connection To The Furnace - Broan ERV90HC Installation Instructions Manual

4. CONTROLS
(CONT'D)
4.4 O A
PTIONAL UXILIARY
4.4.1 20-M L
INUTE IGHTED
Set the push-button timer to ON. The fan motors will then operate at high speed for 20 minutes and the indicator
will light up.
To stop activation, push one time; the unit will then get back to previous selection.
4.4.2 60-M C
INUTE
This control makes the system operate at high speed for periods varying from 10 to 60 minutes.
4.4.3 H C
UMIDITY ONTROL
Setting during the fall, winter and spring months:
Adjust knob to the desired maximum humidity level.
Setting during summer:
Adjust knob to the OFF positon.
Do not select a humidity level below 30%. This could lead to excessive dryness in the air
causing discomfort for the occupants.

5. ELECTRICAL CONNECTION TO THE FURNACE

Never connect a 120-volt AC circuit to the terminals of the furnace interlock (standard wiring). Only use the low voltage class
2 circuit of the furnace blower control.
For a furnace connected to a cooling system:
On some older thermostats, energizing the «R» and «G» terminals at the furnace has the effect of energizing «Y» at the thermostat and
thereby turning on the cooling system. If you identify this type of thermostat, you must use the
STANDARD FURNACE INTERLOCK WIRING
W R G Y
FOUR
WIRES
TWO WIRES
heating only
W
R
G
C
Y
FURNACE
24-VOLT
TERMINAL BLOCK
VE0108A
W C O
ALL ONTROLS PERATION
P -B T
USH UTTON IMER
T
RANK IMER
CAUTION
THERMOSTAT
TERMINALS
TWO WIRES
COOLING SYSTEM
WARNING
!
0
ALTERNATE FURNACE INTERLOCK WIRING
W
4 WIRES
2 WIRES
heating only
W
R R
G
C
Y
Y
FURNACE
24-VOLT
TERMINAL BLOCK
- 19 -
VC0084
VC0017
20%
HUMIDITY
25%
CONTROL
VC0085
ALTERNATE FURNACE INTERLOCK WIRING
THERMOSTAT
R G Y
TERMINAL
wiring
nuts
NO
NC
C
2 WIRES
ON
OFF
TURN
PAST
20
10
20
30
60 40
50
70%
30% 60%
50%
40%
.
COOLING SYSTEM