Main
Models:
MWC116ENT MWC116ELT MWC116ENL MWC116ELL
L
MWC Series
Mid Efciency Gas-Fired Hot Water Direct Vent Condensing Boilers InStallatIon InStruCtIonS
D E S I G N E D T O L
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Table of Contents
I Product Description
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4
Table 2.2: Ratings
See Vent Section for additional venting options and requirements
Table 2.3: Maximum Vent Lengths
II Speci cations
Figure 2.1: General Con guration
Table 2.4: Other Speci cations
5
III Before Installing
IV Locating the Boiler
NOTICE
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V Mounting The Boiler
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VI Air for Ventilation
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12
VII Venting
A. Vent System Design
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14
Table 7.1: Summary Of Horizontal Venting Options
Figure 7.2: Horizontal Concentric Venting (Vent Options 1-3)
15
Table 7.3a: Crown Concentric 60/100 Vent Components (Vent Options 1,2)
Table 7.3b: Crown Concentric 80/125 Vent Components (Vent Options 3,5)
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17
table 7.5: Vent/ air Intake Fitting Equivalent length
table 7.6: Summary of Vertical Venting options
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19
B. Removing an Existing Boiler From a Common Chimney
20
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Figure 7.32: Cutting Straight Pipe
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30
Figure 7.35a: Dimension H
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VIII Gas Piping
Figure 8.1: Gas Tailpiece Installation
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36
IX System Piping
A. Standard Piping
DANGER
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X. Domestic Water Piping
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XI Wiring
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Figure 11.7: Internal Boiler Wiring
XII Start-up and Checkout
Auto Air Vent Cap
52
Shaft Screw Cover
Figure 12.2: Location of Circulator Shaft Cover
53
Figure 12.3: Control Panel
Figure 12.4: Main Burner Flame
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56
MWC Series Lighting and Operating Instructions
WARNING
FOR YOUR SAFETY READ BEFORE OPERATING
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE
57
Table 12.8: High Fire Combustion Readings
58
XIII Operation
Figure 13.1: Control Panel
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60
(Also Refer to Figures 9.7, 9.8, 10.3, 11.7)
61
Table 13.4: Flash Codes During Normal Operation (See Part XV for Error Codes)
XIV. Service and Maintenance
63
Figure 14.1: Removing Combustion Chamber Cover
Neg. Pressure Tap Venturi
Page
66
XV. Troubleshooting
Turn off power to boiler before replacing fuses or working on wiring.
Fuse
Figure 15.2: Fuse Location
Line Voltage Connections
67
Table 15.3: Error Codes
68
Figure 15.4 Flow Chart for Isolating Limit and APS Errors (See Table 15.3)
N YN
Y
NN YY
XVI Parts
C.h. return group and d.h.w. heat exchanger (Model combi)
C.h. flow group and three way diverter valve (Model combi)
* Includes items 23, 28, 29, 30, 31, 32, 20, 36
C.h. flow and return groups (Model c.h. only)
* Includes items 20, 28, 29, 30, 31, 32, 36
Pump and main circuit assembly (Model combi)
Pump and main circuit assembly (Model c.h. only)
Gas assembly
Connection pipes
* Not for model c.h. only
Control panel and ignition device (Model combi)
Control panel and ignition device (Model c.h. only)
Wiring (Model combi)
Wiring (Model c.h. only)
Fan, combustion chamber and case panels
