21
Fig. 22 —
Mo
dulat
in
g Gea
r Econo
m
izer wi
th
Re
li
e
f for
Si
zes 07
-1
7 BREP Unit
s
N
O
TES:
1.
U
n
it w
ir
ing sho
w
n as ref
e
re
nce on
ly
.
Chec
k unit
wir
ing
fo
r actual unit
wir
ing
.
2.
R
e
la
ys 1K and 2K actuate w
hen the outd
oor air
enth
a
lp
y is higher than the retur
n
air enthalp
y.
3.
1
S
is an electronic s
w
itch
which cl
o
s
es when
po
w
e
red b
y
a
24 V
A
C input.
4.
F
a
ctor
y-installed resistor should be remo
v
ed
only if C
7400 diff
erent
ial enthalp
y
sensor is added.
a39-4094
