SECTION 14: O
UTSIDE
C
OMBUSTION
A
IR
S
UPPLY
63 of 91
14.6 Pressurized Outside Air Supply
If
u
sed, the o
u
tside air s
u
pply blo
w
er
(P/N 90707501K) sho
u
ld be
w
ired in parallel
w
ith the
p
u
mp, and in accordance
w
ith the National Electric
Code
®
NFPA 70 - latest revision and local ordinances.
The blo
w
er air press
u
re s
w
itch m
u
st be
w
ired in
series
w
ith the press
u
re s
w
itch on the p
u
mp.
All joints and seams in the air s
u
pply system m
u
st be
airtight. See above instr
u
ctions on attaching d
u
ct to
the b
u
rner. Mo
u
nt the blo
w
er according to the
man
u
fact
u
rer’s instr
u
ctions. Additional mo
u
nting
materials are provided by the contractor.
14.7 Outside Air Blower Internal Wiring
FIGURE 31: Outside Air Blower Internal Wiring Diagram
Pressure Switch
5" (127 mm)
Discharge
5"
(127 mm)
Inlet
Motor
L
MOTOR
M
N
BLK
W
HT
T1
T3
T2
C
N
O
BLU
BLU
BLO
W
ER
PRESSURE
S
W
ITCH
The o
u
tside air blo
w
er is shipped
w
ith the
blo
w
er man
u
fact
u
rer’s standard internal
w
iring.
For
u
se
w
ith RAPID
™
heaters, the o
u
tside air
blo
w
er m
u
st be re
w
ired
w
ith existing
w
ires by
the electrical contractor. See diagram.
NOTE: The internal 24 V relay provided will
not be used and can be discarded.
