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A.
General Guidelines
1. Read and follow all venting, combustion air,
water piping, gas piping and electrical instructions
contained in this manual unless otherwise instructed
in this section.
2. Consult Local Building Codes or National Fuel Gas
Code, NFPA 54/ANSI Z222.3 for restrictions and
instructions on modular boiler installations.
B.
Module Sizing
Burnham recommends sizing each boiler in a modular
system to provide 20 % of the combined heating load
where ever possible.
C.
Venting
1. Each boiler must have an individual vent pipe.
Refer to Venting Section of this manual for venting
guidelines and options.
WARNING
Do not manifold vent pipes together.
2. The maximum vent length for each boiler is fifty
(50) equivalent feet.
3. The minimum horizontal distance between vent
terminations is one (1) foot. Additional horizontal
distance is desirable to avoid frost damage to the
building. Vent terminations must be at least twelve
(12) inches above the ground plus the expected
snow accumulation.
CAUTION
Installing multiple vent terminations close
together promotes frost buildup on buildings. To
minimize this possibility, extend the distance from
the building to the end of the vent termination
and increase the horizontal distance between
terminations.
4. Multiple vertical vent pipes may be piped through
a common conduit or chase so that one roof
penetration may be made. Each vent termination
must be one (1) foot from other terminations.
D.
Air Intake Piping
1. Each boiler must have an individual air intake pipe,
refer to Venting Section of this manual for Air Intake
Guidelines and Options.
2. The maximum air intake length for each boiler is
fifty (50) equivalent feet.
3. Locate air intake termination on the same wall as
the vent termination if possible, to prevent nuisance
boiler shutdowns. However, boiler may be installed
with vertical venting and sidewall combustion air
inlet (or visa versa) if installation conditions do not
allow alternate arrangement.
VII. Modular Installation
TABlE 9: MODUlAR BOIlER WATER
MANIFOlD SIZING
E.
Water Piping
(See Table 9)
Installing a low water cutoff in the system piping of
modular systems is strongly recommended and may be
required by Local Codes.
F.
Gas Piping
1. Refer to National Fuel Gas Code, Local Codes and
Tables 7 and 8 for gas pipe sizing.
2. Each boiler must be piped as shown in Figure 27.
WARNING
If gas pressure in the building is above ½ psig,
an additional gas pressure regulator is required.
Using one additional regulator for multiple
boilers may result in unsafe boiler operation.
The additional regulator must be able to properly
regulate gas pressure at the input of the smallest
boiler. If the regulator cannot do this, two or
more additional regulators are required. Consult
regulator manufacturer and/or local gas supplier
for instructions and equipment ratings.
G.
Electrical
1. Each boiler must be provided with a fused
disconnect and service switch.
2. Install wiring in accordance with requirements of
authority having jurisdiction. In the absence of such
requirements, follow the National Electric Code,
NFPA 70 and/or CSA C22.1 Electric Code.
H.
Modular Boiler Control Systems
Contact a controls manufacturer such as Honeywell or
Tekmar to properly apply a modular control system.
Common systems may use outdoor temperature, return
water temperature or both to stage the boilers.
Combined Output
(MBH)
Recommended Minimum
Common Water Manifold
Size (NPT)
< 166
1¼”
< 260
1½”
< 550
2”
< 900
2½”
< 2000
3”
Summary of Contents for SCG
Page 5: ...Figure 2 Dimensions...
Page 13: ...13 Figure 4A Recommended Separate Horizontal Vent Air Intake Installation...
Page 14: ...14 Figure 4B Alternate Separate Horizontal Vent Air Intake Installation...
Page 15: ...15 Figure 5A Separate Horizontal Vent Air Intake Terminal Configuration SCG 3 thru 7...
Page 16: ...16 Figure 5B Separate Horizontal Vent Air Intake Terminal Configuration SCG 8 and 9...
Page 19: ...19 Figure 7 Attic Offset Figure 6 Vertical Vent Installation...
Page 22: ...22 Figure 9 Vertical Air Intake Piping...
Page 25: ...25 Figure 10 Combination Horizontal Vent Air Installation SCG 3 thru 6...
Page 26: ...26 Figure 11 Combination Horizontal Vent Air Terminal Installation SCG 3 thru 6...
Page 38: ...38 Figure 12 Recommended Separate Horizontal Vent Installation...
Page 39: ...39 Figure 13 Alternate Separate Horizontal Vent Installation...
Page 44: ...44 Figure 22 Optional Separate Horizontal 4 Vent Terminal Installation Indoor Air...
Page 48: ...48 Figure 25 Recommended Water Piping for Circulator Zoned Heating Systems...
Page 49: ...49 Figure 26 Recommended Water Piping for Zone Valve Zoned Heating Systems...
Page 54: ...54 Figure 28 Internal Boiler Wiring Schematic Diagram...
Page 57: ...57 Figure 30 System Wiring Schematic for Single Zone Space Heating Only...
Page 59: ...59 Figure 32 Circulator Zoned System Wiring Schematic...
Page 60: ...60 Figure 33 Zone Valve Zoned System Wiring Schematic...
Page 61: ...61 Figure 34 Different Manufacturer s Zone Valve Connections to Honeywell R8889...
Page 63: ...63 Figure 35 Modular Boiler Gas Piping...
Page 65: ...65 Figure 36 Operating Instructions...
Page 68: ...68 Figure 38 Troubleshooting Guide Honeywell Electronic Ignition Troubleshooting Guide...
Page 73: ...73 Figure 44 Flue and Burner Cleanout 1 Burner...
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Page 94: ...94 SERVICE RECORD DATE SERVICE PERFORMED...