B-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
120 of 147
5.
Adj
u
st air handler high fire gas press
u
re.
•
Determine the high fire gas press
u
re by
adding the manifold press
u
re for maxim
u
m
inp
u
t (from the rating plate) and the b
u
rner
negati
v
e press
u
re (from the meas
u
rement
made in the b
u
rner press
u
re section of this
proced
u
re). Record this
v
al
u
e for
u
se in
adj
u
stment step.
For example:
Differential press
u
re= -1.0 in
w
c
Maxim
u
m manifold press
u
re (from rating plate)= 2.0
in
w
c
High fire gas press
u
re= 2.0 + (-1.0) in
w
c
High fire gas press
u
re= 1.0 in
w
c
•
Force the b
u
rner into high fire. Refer to the
b
u
rner mode setting chart
, for the specific amplifier and action
•
Set the press
u
re at the b
u
rner side of the
mod
u
lating
v
al
v
e to the calc
u
lated
v
al
u
e
(from the begining of this step), by remo
v
ing
high fire adj
u
stment cap and rotating the
reg
u
lator adj
u
stment scre
w
. A clock
w
ise
rotation increases manifold press
u
re.
Temperat
u
re rise sho
u
ld not exceed
maxim
u
m as listed
For Model 2005, the high fire gas press
u
re
is set by adj
u
sting the reg
u
lator
u
pstream of
the M611
v
al
v
.
•
Reconnect any
w
ires that
w
ere
u
sed for
adj
u
stment.
6.
Adj
u
st recirc
u
lating mode or red
u
ced air
v
ol-
u
me high fire gas press
u
re
• This adj
u
stment is req
u
ired for and only
applies to AM and VAV style
u
nits.
• Force the
u
nit into high fire and maxim
u
m
recirc
u
lation for AM style or minim
u
m air
v
ol
u
me for VAV style. Refer to the b
u
rner
mode setting chart
for specific amplifier and action req
u
ired to
place it into high fire.
• Meas
u
re the recirc
u
lation temperat
u
re rise
and compare it to
.
• The resistor on the red
u
ced flo
w
s
w
itch
(mo
u
nted inside the control enclos
u
re) may
need adj
u
stment
u
ntil recirc
u
lation
temperat
u
re rise is obtained.
• Ret
u
rn
u
nit to normal operating conditions.
• Reconnect any
w
ires that
w
ere remo
v
ed for
adj
u
stment.
7.
Maxim
u
m discharge temperat
u
re is 160° F
(71° C) for models appro
v
ed to Z83.4 and
Z83.18 (see ETL Standard). For models
appro
v
ed Z83.25 (see ETL Standard), the
maxim
u
m discharge temperat
u
re is 200° F
(93° C).
8.
Lo
w
fire adj
u
stment
•
NOTE:
High fire gas press
u
re m
u
st be set
BEFORE adj
u
sting lo
w
fire. There are three
critical items to consider before adj
u
sting
lo
w
fire:
A. Lo
w
fire adj
u
stment does not reg
u
late
gas press
u
re.
B. If the lo
w
fire adj
u
stment scre
w
is set to
maxim
u
m, high fire reg
u
lation problems
w
ill occ
u
r.
C. The b
u
rner control system m
u
st be
forced into lo
w
fire per the "B
u
rner Mode
•
Lo
w
fire is set at the MR212
v
al
v
e
u
sing the
adj
u
stment scre
w
u
nder the lo
w
fire
adj
u
stment cap scre
w
(loosen locking scre
w
before adj
u
stment),
, or on the M611
v
al
v
e
u
sing the brass
adj
u
sting scre
w
on the front side,
. The b
u
rner m
u
st be forced
into lo
w
fire first. Then rotate the adj
u
stment
scre
w
u
ntil there is a contin
u
o
u
s bl
u
e ribbon
across the entire b
u
rner. A co
u
nter
clock
w
ise rotation increases the flame size.
Lo
w
fire temperat
u
re rise m
u
st not exceed
12° F (7° C). Tighten locking scre
w
w
hen
finished.
•
Reconnect any
w
ires that
w
ere remo
v
ed for
adj
u
stment.
9.
Once gas press
u
re and high/lo
w
fire adj
u
st-
ments are made, the gas set
u
p is completed.
All taps and instr
u
ments m
u
st be remo
v
ed and
all caps and pl
u
gs m
u
st be replaced.
Summary of Contents for 2005
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Page 31: ...SECTION 7 ROOF CURB 21 of 147 FIGURE 12 Curb Mounting Air Handler Roof Curb Fastening Detail...
Page 154: ...B SERIES INSTALLATION OPERATION AND SERVICE MANUAL 144 of 147...
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