S
ERIES
XT I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
64
adj
u
stment.
Table 15: Motor Sheave Drive Tor
q
ue
Specifications
Table 16: Motor and Blower Bushin
g
Tor
q
ue
Specifications
20.4.2 Burner Pressure
1. A
press
u
re tap is
u
sed to meas
u
re differential
at the b
u
rner and to set high fire gas press
u
re.
On air handlers eq
u
ipped
w
ith a M611 mod
u
-
lating
v
al
v
e (Model XT-112), the press
u
re tap is
located on a tee bet
w
een the M611
v
al
v
e and
the b
u
rner.
. On air handlers eq
u
ipped
w
ith
the MR212 mod
u
lating
v
al
v
e (Models XT-115 -
XT-130), the press
u
re tap co
u
ld be located on
the do
w
nstream side of the MR212
v
al
v
e, on a
T-fitting coming off the o
u
tlet press
u
re tap on
the MR212
v
al
v
e or bet
w
een the MR212
v
al
v
e
and the b
u
.
2.
Meas
u
re the b
u
rner press
u
re
w
ith the inlet
man
u
al gas
v
al
v
e off.
- Open the man
u
al sh
u
t off located bet
w
een
the mod
u
lating
v
al
v
e and the b
u
rner.
- T
u
rn the blo
w
er on and record the negati
v
e
press
u
re on a
u
-t
u
be manometer or gas
press
u
re ga
u
ge. This reading is
u
sed for high
fire b
u
rner press
u
re adj
u
stment.
3.
After taking the b
u
rner press
u
re reading, tem-
porarily lea
v
e the manometer attached to the
1/8" tap. It
w
ill be
u
sed later to check high fire
gas press
u
re.
20.5 Gas Pipin
g
and Initial Pressure Settin
g
s
1. Perform a press
u
re test on all gas s
u
pply lines
to the air handler per applicable codes.
Make sure to isolate all
g
as controls before
pressure testin
g
the system.
2.
Verify s
u
pply press
u
re does not exceed maxi-
m
u
m rated gas press
u
re as stated on the rating
plate.
3.
Set the s
u
pply gas press
u
re at the step do
w
n
reg
u
lator (normally o
u
tside of the enclos
u
re if
one is installed) according to the nameplate
rating inlet gas press
u
re specifications.
4.
Only after performing steps 1-3 (abo
v
e),
v
erify
pilot press
u
re.
•
Place a
u
-t
u
be manometer or gas press
u
re
ga
u
ge on the tee at the do
w
nstream side of
the pilot press
u
re reg
u
lator.
•
Open the main gas
v
al
v
e and close the gas
v
al
v
e do
w
nstream of the MR
v
al
v
e.
•
Set the b
u
rner s
w
itch to "on" and adj
u
st the
pilot press
u
re reg
u
lator to 1.0 in
w
c for
nat
u
ral gas or 0.5 in
w
c for LPG.
•
Verify that the b
u
rner flame control has a
flame signal of 6-8 Vdc.
FIGURE 34: Fireye Flame Module
Setscrew Size
Allen Wrench
Tor
q
ue Settin
g
s
in
•
Lbs
ft
•
Lbs
1/4"
1/8"
87
7.3
5/16"
5/32"
120
10.0
3/8"
3/16"
290
24.2
Bolt Size (on Bushin
g
)
Tor
q
ue Settin
g
s
in
•
Lbs
ft
•
Lbs
#10
60
5
1/4"
108
9
5/16"
192
16
3/8"
360
30
1/2"
720
60
Connect
Test Leads
Here
Summary of Contents for XT112
Page 2: ......
Page 4: ......
Page 6: ... 2017 Weather Rite LLC Printed in the U S A ...
Page 50: ...SERIES XT INSTALLATION OPERATION AND SERVICE MANUAL 44 FIGURE 25 Interconect Wiring 2 ...
Page 96: ......
Page 97: ......
Page 98: ......
