Manual 2100-573A
Page
12 of 21
FIGURE 6
ELECTRIC HEAT CLEARANCE
WIRING – MAIN POWER
Low Voltage Connection
These units use a 24-volt AC low voltage circuit.
The “
R
” terminal is the
hot
terminal and the “
C
”
terminal is
grounded
.
“
G
” terminal is the
fan input
.
“
Y1
” terminal is the
compressor input for cooling
1-Stage units only
“
W1
” terminal is the
1st stage electric heat
.
“
W2
” terminal is the
2nd stage heat
(if equipped).
“
1
” NC (normally closed) lockout alarm.
“
2
” NO (normally open) lockout alarm.
“
3
” COM lockout alarm.
“
4
” & “
5
” dirty filter alarm NC (normally closed).
WIRING – LOW VOLTAGE WIRING
230/208V, 1 phase and 3 phase equipment dual
primary voltage transformers. All equipment leaves
the factory wired on 240V tap. For 208V operation,
reconnect from 240V to 208V tap. The acceptable
operating voltage range for the 240 and 208V taps are:
TAP
RANGE
240
253 – 216
208
220 – 187
NOTE: The voltage should be measured at the field
power connection point in the unit and while the
unit is operating at full load (maximum
amperage operating condition).
For wiring size and connections, refer to MV4000
Controller Manual 2100-571.
DIRTY FILTER SWITCH & RELAY
These units include a dirty filter switch and relay. The
alarm output of relay is normally closed, open on
alarm and is connected to terminals 4 and 5 of the unit
low voltage terminal block.
NOTE 1: Side section view of supply air
duct for wall mounted unit showing 1/4
inch clearance to combustible surfaces.
WARNING
•
A minimum of 1/4 inch clearance must be maintained
between the supply air duct and combustible materials.
This is required for the first 3 feet of ducting.
•
It is important to insure that the 1/4 inch minimum
spacing is maintained at all points.
•
Failure to do this could result in overheating the
combustible material and may result in fire.
