4000-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
74 of 154
1
8
.3 Gas Pipin
g
The gas manifold connection extends thro
u
gh the
side of the control enclos
u
re for
v
ertical eq
u
ipment
and thro
u
gh the bottom for horizontal eq
u
ipment. The
factory piping terminates
w
ith a male pipe connection
in the primary gas
v
al
v
e. Be s
u
re that the f
u
el s
u
pply
pipe connected at this point is large eno
u
gh to
ens
u
re the proper
v
ol
u
me and line press
u
re at the
inlet of the air handler. The piping m
u
st comply
w
ith:
United States: Refer to NFPA 54/ANSI Z223.1 - latest
re
v
ision, National F
u
el Gas Code.
Canada: Refer to CSA B149.1 - latest re
v
ision,
Nat
u
ral Gas and Propane Installation Code.
Gas s
u
pply piping m
u
st conform to best b
u
ilding
practices and local codes. D
u
ring installation of the
gas piping, be s
u
re that piping does not restrict
accessibility to the air handler or its remo
v
able
access doors.
Lockable man
u
al sh
u
t-off
v
al
v
e m
u
st be added by the
installer in compliance
w
ith Occ
u
pational Safety and
Health Administration (OSHA) reg
u
lations.
1
8
.4 Pressure Test Ports
There are 1/8"(3.2 mm) and 1/4"(6.4 mm) press
u
re
test ports located on the manifold. The test ports are
a
v
ailable to meas
u
re the manifold inlet gas press
u
re
and the b
u
rner gas press
u
re d
u
ring b
u
rner set
u
p.
1
8
.4.1 Manifold Inlet Gas Pressure
The press
u
re test port for meas
u
ring manifold inlet
press
u
re is located on the inlet side of the first safety
sh
u
toff
v
al
v
e. Refer to the
u
nit rating plate for the
acceptable inlet gas press
u
re.
1
8
.4.2 Burner Gas Pressure
A press
u
re tap is
u
sed to meas
u
re negati
v
e press
u
re
at the b
u
rner (fan only, gas
v
al
v
es closed) and to set
high fire gas press
u
re reg
u
lating (gas
v
al
v
es open).
Air handlers are eq
u
ipped
w
ith a mod
u
lating/
reg
u
lating
v
al
v
e (MRV). The press
u
re tap is located
on the do
w
nstream side of the MRV.
Summary of Contents for 4044
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Page 73: ...SECTION15 VIBRATION ISOLATION 65 of 154 FIGURE 52 Curb Mounted Roof Curb Roof Curb...
Page 109: ...SECTION19 ELECTRICAL 101 of 154...
Page 110: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 102 of 154...
Page 111: ...SECTION19 ELECTRICAL 103 of 154...
Page 112: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 104 of 154...
Page 113: ...SECTION19 ELECTRICAL 105 of 154...
Page 114: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 106 of 154...
Page 115: ...SECTION19 ELECTRICAL 107 of 154...
Page 116: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 108 of 154...
Page 117: ...SECTION19 ELECTRICAL 109 of 154...
Page 118: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 110 of 154...
Page 119: ...SECTION19 ELECTRICAL 111 of 154...
Page 121: ...SECTION 20 DIRECT FIRED BURNER 113 of 154 FIGURE 71 Midco HMA 2A Burner...
Page 122: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 114 of 154...
Page 125: ...SECTION 20 DIRECT FIRED BURNER 117 of 154...
Page 126: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 118 of 154...
Page 127: ...SECTION 20 DIRECT FIRED BURNER 119 of 154 20 3 Honeywell UV Flame Detector...
Page 160: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 152 of 154...
Page 161: ...SECTION 27 THE RAPID 4000 SERIES WARRANTY 153 of 154...
Page 162: ...4000 SERIES INSTALLATION OPERATION AND SERVICE MANUAL 154 of 154...
