Rapid 4044, Инструкция по установке, эксплуатации и обслуживанию

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SECTION 21: S
TART
-
UP
P
ROCEDURES
125 of 154
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 on Page 125,
Table 37 , 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 on Page 126, Table 38 .
For u nder a million BTU inp u t, 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 e. See
Page 128, Figure 79 .
• 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 on Page 125, Table 37
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 Page 126, Table 38 .
• 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
by Amplifier Type" table. See Page 125,
Table 37 .
• 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), See Page 127, Figure
77 , or on the M611 v al v e u sing the brass
adj u sting scre w on the front side, See Page
129, Figure 22 . 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.
Table 37: Burner Mode by Amplifier Type
Amplifier Type Hi g h Fire Mode Low Fire Mode
Series 14
Remo v e w ire from terminal
#4 on the amplifier
Remo v e w ire from ter-
minal #8 on the ampli-
fier
Series 44
Remo v e w ires from termi-
nals #2 and #4 on the
amplifier
Remo v e from terminal
#9 on the amplifier