Krom Schroder GIK 40TN02-5, GIK 50TN02-5, GIK 15TN02-5B, GIK 25TN02-5B, GIK 40TN02-5B Technical Information
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AIR/GAS RATIO CONTROLS
GIK, GIK..B
Technical Information
T-Product 2004 November
For maintaining constant gas/air ratios
Cross-connected operation with modulating or
high-low control of nozzle mix burners
Zero regulator operation for premix burners
Precise pressure regulation over wide turndown
ranges
Low maintenance
Valve seat design for consistent low fire repeatability
Balanced double diaphragm design allows regula-
tor to operate over a wide range of inlet pressures
while minimally affecting outlet pressure
CE certified models available
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T-Product · GIK, GIK..B · 2004 November
▼ = To be continued
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . 2
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
Nozzle Mix Burner . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Premix Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
Dimensions and Weights. . . . . . . . . . . . . . . . . . .
6
Sizing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
Bypass Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
How to install the air control line. . . . . . . . . . . . . .
10
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
To adjust the low fire position at GIK. . . . . . . . . . . .
11
To adjust the low fire position at GIK..B (with internal
Bypass) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
Special Features Conversion Kit for zero
Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
Order Information . . . . . . . . . . . . . . . . . . . . . . .
15
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . .
16
Flow at low fire position too high? . . . . . . . . . . . .
16
Air control pressure too high? . . . . . . . . . . . . . . .
16
Gas/Air ratio is not 1:1 at high fire . . . . . . . . . . . . .
17
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
Spare parts GIK ½" to 2" . . . . . . . . . . . . . . . . . . .
19
Spare parts GIK 2½" to 4" . . . . . . . . . . . . . . . . . .
20
Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
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T-Product · GIK, GIK..B · 2004 November
M
* Cross connection line should be no smaller than ¼“ pipe or 3/8”
OD tubing, as short and with as few bends as possible.
Application
GIK Regulators hold constant gas/air ratios as crossconnected ratio regulators with modulating or high-low
control of nozzle mix burners or as zero governors on
premix systems.
When used as cross-connected regulator for nozzle mix
burners, GIK regulator provide outlet gas pressure at a
1:1 pressure ratio with air loading. For leaner or richer low
fire ratios, the bias spring can be adjusted to provide an
outlet pressure up to 1.2” WC (3 mbar) higher or lower
than the loading pressure.
For repeatable control of extremely small low fire inputs
(frequently, only the pilot), the GIK..B Regulator, with
a fixed internal Bypass (1/2” to 2”), is recommended.
When the system drives to low fire, the regulator valve
closes completely, and the low fire gas flow is controlled
accurately by precision-machined internal orifice.
Typical air and gas piping layouts for nozzle-mixing and
premix systems are shown in the pictures “Nozzle Mix
Burners” and “Premix Burners”. These schematics
contain only those components related to the gas-air
ration control system. A complete combustion system must also contain a suitably-sized combustion air
source and safety-related components, such as safety
shutoff valves, air and gas pressure switches and flame
supervisor components. Consult the latest versions of
the standards which apply to your installation, such
as NFPA 86 or CAN/CGA-B149.1, for guidance. If in
doubt about which components are required, contact
Kromschroder for assistance.
Nozzle Mix Burners with High-Low Control, including Pulse Firing
Manual
Shutoff Valve
Orifice
GIK..B
Flexible Gas
Connection
Orifice
Orifice
Safety Shutoff Valve,
Slow Opening
Automatic Air
Control Valve
Cross-connection
Line*
To Other Zones
GAS
AIR
Nozzle Mix Burners with Modulating Control
Manual
Shutoff Valve
Orifice
GIK
Flexible Gas
Connection
Orifice
Manual
Air Trim
Valve or
Orifice
Safety Shutoff Valve,
Slow Opening
Motorized Zone
Air Control Valve
Cross-connection
Line*
To Other Zones
GAS
AIR
To Other Zones
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T-Product · GIK, GIK..B · 2004 November
Application
M
Premix Burners
Manual
Shutoff Valve
Mixer
GIK..B
Flexible Gas
Connection
Orifice
Safety Shutoff Valve,
Slow Opening
Motorized Zone
Air Control Valve
Burner
To Other Mixers
GAS
AIR
To Other Zones
Nozzle Mix Burner
The cross connection line should be no smaller than 1/4”
pipe or 3/8” OD tubing, as short and with a few bends
as possible.
See installation instructions for other recommendations.
Premix Burners
If burner is sealed in and combustion chamber pressure
is other than zero, connect vent to combustion chamber.
Otherwise leave it open to atmosphere.
Vent
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T-Product · GIK, GIK..B · 2004 November
Specifications
Operating Limits
Type of gas: Natural, LPG, clean coke oven gas and clean biogas
Ambient temperature range: GIK ½” to 2” = -4 °F to 158 °F (-20 °C to 70 °C)
GIK 2½” to 4” = 5 °F to 140 °F (-15 °C to 60 °C)
Maximum inlet pressure: 3 psig (200 mbar)
Maximum operational inlet-
to-outlet differential pressure: 1.5 psig (100 mbar)
Combustion air loading pressure: 0.2” to 48” WC (0.5 to 120 mbar)
Outlet pressure range: 0.1” to 47.6” WC (0.2 to 119 mbar)
Adjusting range at min. flow: GIK ½” to 2” = -1.2” to +1.2” WC (-3 to +3 mbar)
GIK 2½” to 4” = -0.8” to +0.8” WC (-2 to +2 mbar)
Connection for Control line: GIK ½” to 2” = ¼” NPT
GIK 2½” to 4” = ½” NPT
Mechanical Data
Available pipe sizes NPT-threaded: ½”, ¾", 1”, 1½”, 2”
ANSI flanged: 2½”, 3”, 4”
Materials of Construction
GIK ½” to 2”: Pressure die-cast aluminium alloy valve bodies and diaphragm housings. Diaphragms and
valve discs are nitrile rubber. Valve stems are precision molded plastic.
GIK 2½” to 4”: Sand-cast aluminium alloy valve bodies and diaphragm housings. Diaphragms and valve discs
are nitrile rubber. Valve stems are made of aluminium.
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T-Product · GIK, GIK..B · 2004 November
Dimensions and Weights
GIK 15 – 50TN GIK 65 – 100TA
H1
L
H2
øD
Rp
1
/4
¼ NPT
d2
k
D2
H2
øD
H1
L
Rp
1
/2
½ NPT
Type Connection max. inlet
pressure
Dimensions Flange Drilling Weight
L D H1 H2 D2 k d2 No.
psig mbar inch mm inch mm inch mm inch mm inch mm inch mm inch mm lbs kg
GIK 15TN NPT ½"
3 200 4.72 120 5.28 134 1.34 34 5.20 132 – – – – – – – 2.20 1.0
GIK 20TN NPT ¾"
3 200 4.92 125 5.28 134 1.34 34 5.20 132 – – – – – – – 2.20 1.1
GIK 25TN NPT 1"
3 200 4.92 125 5.28 134 1.34 34 5.20 132 – – – – – – – 2.20 1.1
GIK 40TN NPT 1½"
3 200 6.10 155 7.29 185 1.77 45 5.87 149 – – – – – – – 4.19 1.8
GIK 50TN NPT 2"
3 200 7.87 200 9.21 234 2.03 52 6.57 167 – – – – – – – 6.82 2.8
GIK 65TA
ANSI 2½"
3 200 11.42 290 10.24 260 3.50 89 16.22 412 7.01 178 5.51 140 0.75 19 4
26.46
12.0
GIK 80TA ANSI 3"
3 200 12.20 310 12.20 310 3.94 100 17.56 446 7.52 191 5.98 152 0.75 19 4
35.50
16.1
GIK 100TA ANSI 4"
3 200 13.78 350 15.35 390 4.53 115 19.72 501 9.02 229 7.52 191 0.75 19 8
57.33
26.0
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T-Product · GIK, GIK..B · 2004 November
Sizing
Selection
For premix and modulating control of nozzle mix burn-
ers, select the GIK. For high-low control of nozzle mix
burners, including pulse firing, use the GIK..B regulator
with the internal bypass.
When used as cross-connected regulators, GIK turn-
down depends on the range of their outlet (loading) pres-
sures between high and low fire. The greater the range,
the greater the turndown. Always figure the turndown
before sizing the regulator, because this determines the
inlet pressure required.
Flow Turndown
Ratio
High Fire Outlet or Loading Pressure
Required to get Turndown if Low
Fire Loading Pressure is 0.2" WC
(0.5 mbar)
10 to 1 20" WC (50 mbar)
8 to 1 12.6" WC (32 mbar)
6 to 1 7.1" WC (18 mbar)
5 to 1 4.9" WC (12.5 mbar)
GIK..B Regulator turndown will depend on the sizing of
the internal bypass orifice.
1. Determine the gas pressure that will be supplied to
the regulator inlet and convert it from psig to ” WC
(psig x 27.7 = " WC). It should be at least equal to the
regulator’s high fire outlet pressure plus the pressure
drop across the regulator itself. The high fire outlet
pressure will be 0 for zero governors. On cross-con
-
nected nozzle-mixing applications, it will equal the
high fire outlet pressure determined under Turndown
above. For best results, the pressure drop across the
regulator should be about 10" WC. If the inlet pressure is considerably less than what’s needed, try to
obtain higher supply pressure. If this isn’t possible,
use a lower pressure drop across the regulator, but
don’t go below 2" WC.
2. Multiply the maximum gas flow through the regulator
by the correction factors for specific gravity, tempera
-
ture and altitude/line pressure from the tables below.
This is the corrected flow
.
Flow Correction Factors
Specific Gravity Factor
Air (1.0 s. g.) 1.27
Propane (1.56 s. g.) 1.61
Butane (2.00 s. g.) 1.83
Propane/Air (1.29 s. g.) 1.47
Coke Oven (0.45 s. g.) 0.87
Temperature Factor
60°F (16°C) 1.0
100°F (38°C) 0.96
120°F (46°C) 0.95
Line Pressure [psig]
Altitude
1 2 3
Sea Level 1.00 1.03 1.06
1000’ (305 m) 0.98 1.01 1.05
2000’ (610 m) 0.97 1.00 1.03
3000’ (915 m) 0.95 0.98 1.01
4000’ (1220 m) 0.93 0.97 1.00
5000’ (1525 m) 0.92 0.95 0.98
6000’ (1830 m) 0.90 0.94 0.97
7000’ (2135 m) 0.88 0.92 0.95
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