Patterson Kelley DVSCM 02 User Manual

DVSCM-02  
DIRECT VENT/  
SEALED  
COMBUSTION  
DIRECT VENT/  
SEALED  
PATTERSON-KELLEY  
COMBUSTION  
THERMIFIC®  
DIRECT VENT/  
DIRECT VENT/SEALED COMBUSTION  
GAS-FIRED BOILER  
SEALED  
COMBUSTION  
Supplement to the standard Installation and  
Owner's Manual (TBIG - Latest Edition)  
DIRECT VENT/  
SEALED  
C.S.A Design-Certified  
Complies with ANSI Z21.13/CSA 4.9  
Gas-Fired Low Pressure Steam and Hot Water Boilers  
COMBUSTION  
DIRECT VENT/  
ASME Code, Section IV  
Certified by Patterson-Kelley  
SEALED  
COMBUSTION  
C.S.A Design-Certified  
Complies with ANSI Z21.13/CSA 4.9  
Gas-Fired Low Pressure Steam and Hot Water Boilers  
DIRECT VENT/  
SEALED  
COMBUSTION  
Installation Date: _______________________  
DIRECT VENT/  
SEALED  
COMBUSTION  
100 Burson Street, P.O. Box 458,  
East Stroudsburg, PA 18301  
DIRECT VENT/  
Telephone: (877) 728-5351, Facsimile: (570) 476-7247  
SEALED  
COMBUSTION  
DIRECT VENT/  
Thermific® Gas-Fired Boiler  
Introduction  
1.0 INTRODUCTION  
Direct vent (ANSI Z21.13) is a closed system method  
of ducting the combustion air directly from the outside  
of the building into the inlet compartment of the  
burner, and a sealed exhaust vent from the combustion  
chamber to the outdoors.  
1.1.2 Fresh Air System  
(ducted combustion air system)  
In some instances compliance with ANSI Z21.13 may  
not be required, in which case a "fresh air system" may  
be used. Consultation with qualified professionals is  
required to determine whether a "fresh air system" is  
suitable for any particular application and in  
The direct vent/sealed combustion option is available  
on the Thermific® boilers on Series 700, 1000, 1200,  
1500, 1700, and 2000.  
compliance with all applicable codes and regulations.  
All flue gas outlet (exhaust vent) material for a fresh  
air system must be certified for use with a Category I  
Appliance. (Standard B-vent is approved.) The  
exhaust vent may be run horizontally or vertically.  
Proper vent sizing by the vent manufacturer's  
recommendation must be followed.  
Advantages are:  
Savings in energy costs due to the elimination of  
using conditioned air (heated and/or cooled  
building air) from going back up the stack.  
Isolation of the burner from pressure changes in  
the building which can cause erratic combustion  
performance.  
1.2 BASIC INLET/VENT CONFIGURATIONS  
Combustion air is taken from the outside which is  
generally more clean than indoor air. Halide  
contaminants within a building, such as chlorides,  
can cause excessive corrosion in the burner, heat  
exchanger and venting system.  
Four basic configurations are allowable for the  
combustion air inlet and flue gas exhaust vent, as  
follows; installation details are provided in Section 3.  
Eliminates the need for two large combustion  
air/ventilation air openings into the mechanical  
space.  
Exhaust  
Vent  
Roof  
1.1 CODE COMPLIANCE  
Sidewall  
1.1.1 Direct Vent/Sealed Combustion System  
(complying with ANSI Z21.13)  
All flue gas outlet (exhaust vent) material must  
comply with UL-1738. (Standard B-vent is not  
approved.) Proper vent sizing by the vent  
manufacturer's recommendation must be followed.  
The exhaust vent may be run horizontally or vertically.  
The maximum allowable length of the exhaust vent for  
horizontal installations, including the boot tee/135º  
(not a standard tee) and the termination is 100  
equivalent feet. Refer to Section 3.4.5 for equivalent  
lengths.  
Air Inlet  
1. Combustion air inlet duct through the sidewall and  
the flue gas exhaust through the roof. This is the  
preferred method.  
Page 1  
Thermific® Gas-Fired Boiler  
Introduction/Safety  
Sidewall  
Air Inlet  
Exhaust  
Vent  
Roof  
Exhaust  
Vent  
Sidewall  
Air Inlet  
2. Both the combustion air inlet and flue gas exhaust  
through the sidewall.  
4. The combustion air inlet from the roof and the flue  
gas exhaust through the sidewall.  
1.3 PURPOSE AND SCOPE OF THIS MANUAL  
Exhaust  
Vent  
Air Inlet  
This manual is a supplement and companion to the  
Thermific Installation and Owner's Manual. "TBIG."  
Both documents must be used together.  
This companion document describes those safety,  
installation, adjustment, and maintenance procedures  
which differ from the standard model. Information  
that applies to both models is found in the "TBIG"  
latest edition.  
Roof  
2.0 SAFETY  
Refer to the manual for the standard Thermific® Gas-  
Fired Boiler for safety information applicable to this  
equipment. Safety information applicable only to the  
direct vent option appears below.  
3. The combustion air inlet from the roof and the flue  
gas exhaust through the roof.  
Danger!  
Acceptable Venting Methods:  
The only acceptable venting methods are the four  
configurations shown in Section 1.2. Do not attempt  
to use any other method of obtaining combustion air or  
venting flue gases.  
Page 2  
Thermific® Gas-Fired Boiler  
Installation  
Do not manifold two (2) or more units into a common  
sidewall vent system without provisions for additional  
forced draft.  
silicone sealant, or equivalent, must be used on each  
circumferential and horizontal joint before joining  
together. At least 24 hours must be allowed for cure  
of this sealant and proper bond. Cure time can be  
reduced through the application of heat (See  
instructions provided with the sealant). After the cure  
period, each joint must be wrapped with an aluminum  
tape which is faced on the contact side with an  
adhesive.  
3.0 INSTALLATION  
3.1 COMPONENTS PROVIDED  
The direct vent/sealed combustion option is shipped  
with the following items shipped loose for field  
installation:  
3.2.2.2 PVC Duct  
Proper sealing of the tubing is necessary to prevent  
flow of combustion air from conditioned space.  
ƒ
Custom 6 inch diameter to 12 inch diameter  
transition duct with extension, for attachment to  
the combustion air inlet on the boiler.  
The installation must follow the vent manufacturer's  
instructions in all respects including proper joining and  
sealing of the tubing and fittings. Clearances to  
combustible materials and installation of firestops  
must conform to applicable codes.  
ƒ
ƒ
A 12" inlet damper assembly with actuator and  
limit switch mounted to the damper shaft.  
Auxiliary Control Panel to operate the inlet  
damper assembly.  
3.2.3 Air Inlet Termination  
The inlet damper assembly and control panel will  
prevent the flow of cold air through the boiler during  
the off cycle and prevent freeze up and "off cycle"  
losses. The use of these two items is optional.  
Outside Plate  
Centering  
Support  
Plate  
Cover Plate  
Fastener  
Sealant  
Recommended  
Termination  
(refer to text).  
3.2 COMBUSTION AIR INLET SYSTEM  
Note:  
3.2.1 System Design - Pressure Drop  
Sealant  
The air inlet duct system shall be designed for a  
maximum pressure drop of 0.05" W.C. taking into  
account the equivalent length of all fittings. Refer to  
Section 3.4.5 for equivalent length of fittings.  
Field Provided  
Inlet Screen  
12" Min.  
The boiler combustion air inlet duct must be fitted  
with a termination device meeting the requirements of  
ANSI Z21.13. There are four recommended sidewall  
terminations:  
3.2.2 Inlet Duct  
Materials shall be single wall galvanized duct  
(minimum thickness 26 gauge) or PVC duct tubing  
(0.187 inch wall thickness) only. No substitutions.  
Double wall B vent 90 degree elbow, or  
Two double wall B vent 45 degree elbows, or  
Schedule 40 PVC 90 degree elbow, or  
Properly engineered intake louver screen.  
3.2.2.1 Single Wall Galvanized Duct  
Proper sealing of the tubing is necessary to prevent  
flow of combustion air from conditioned space. If  
single wall galvanized tubing is used, GE RTV 102  
Page 3  
Thermific® Gas-Fired Boiler  
Installation  
Whichever material is used, the termination must point  
down and must be backed by a metal plate secured to  
the wall.  
Damper  
Transition  
Duct  
Round  
Important: The chosen inlet termination must be  
included in the calculation of the maximum allowable  
equivalent length. See Section 3.4.5 for equivalent  
lengths.  
Damper  
Housing  
Correct rain cap,  
unrestricted.  
Typical incorrect  
rain cap.  
(Sidewall installation shown.)  
The boiler is equipped with a special collar attached to  
the air inlet opening on the back of the unit (at the  
blower housing on Series 700, 1000, and 1200; at the  
back of the cabinet on Series 1500, 1700 and 2000.).  
A separate box of accessories is sent with the boiler.  
If the combustion air inlet duct is routed through the  
roof, the termination must be either the same type as  
described for a sidewall installation or a rain cap. The  
rain cap must be unrestrictive type similar to the  
illustration below.  
1. Attach the 6 inch diameter end of the custom  
transition duct and the extension to the collar using  
a minimum of 4 sheet metal screws spaced  
approximately at 90 degree intervals. This joint  
must then be wrapped with an aluminum tape  
backed on the contact side with an adhesive. Do  
not use "duct tape."  
3.2.4 Inlet Duct Assembly at the Boiler  
Important: do not insulate the transition duct or  
extension.  
Roof  
Refer to Section 3.2 for instructions for installing and  
wiring the auxiliary control panel; it is required if the  
optional inlet damper is used.  
Round  
Transition  
Duct  
Damper  
3.2.4.1 Sealing PVC Duct Tubing to the Inlet Duct  
90o Elbow  
Apply a 3/4" wide x 1/8" thick gasket to the outside  
surface edge of the entire circumference of the  
transition duct (or extension). A closed cell foam  
rubber gasket with pressure sensitive adhesive works  
very well. Insert 3/4" of the transition duct into the  
PVC duct tubing so that the gasket lines up with the  
edge of the PVC tubing. Lay an approximate 3/8"  
wide bead of GE RTV-102 silicone sealant, or  
equivalent, along the gap between the gasket and  
inside wall of the tubing. Allow the silicone sealant to  
cure for 24 hours. The cure time can be shortened  
Damper  
Housing  
(Roof installation shown.)  
Page 4  
Thermific® Gas-Fired Boiler  
Installation  
with the application of heat. Refer to the  
manufacturer's instructions. Wrap the joint with  
aluminum tape which is backed with an adhesive on  
the contact side.  
1. Terminals for the damper actuator:  
DO = Damper Open (CW)  
DC = Damper Closed (CCW)  
DN = Neutral/Common  
2. Terminals for the limit (end) switch  
3.2.5 Inlet Damper and Auxiliary Control  
Panel (optional)  
SI = N.O. (Normally Open)  
S2 = Common  
Note:  
The inlet damper assembly and control panel will  
prevent the flow of cold air through the boiler during  
the off cycle and prevent freeze up. These two items  
are optional in all installations.  
3.3 EXHAUST VENTING SYSTEM  
3.3.1 System Design - Materials, Length, Size,  
and Construction  
Refer to Section 4.1 for a description of the control  
sequence applicable to the inlet damper.  
The flue gas outlet (exhaust vent) must be designed to  
comply with UL 1738 and ULC-636. (Refer to  
Section 1.1.2 for situations where alternate compliance  
may be permitted.) The exhaust vent can be run  
horizontally or vertically.  
The damper must be field installed into a section of  
horizontal or vertical inlet ductwork. Orient the  
damper such that the arrow points towards the boiler.  
The vent must be sized according to the vent  
manufacture's recommendations. Consult the vent  
supplier for correct sizing and structural support  
requirements. Vent diameter is dictated by the length  
and height of horizontal and vertical portions of the  
vent installation and materials of construction. Design  
calculations should be based on a negative 0.03 W.C.  
with a stack temperature of 325º F (gross) and a CO2  
level of 7.6%; (these values are to be used for vent  
sizing calculations.) The maximum allowable length  
of the vent duct, including the boot tee/135º tee (not a  
standard tee) and the termination is 100 equivalent  
feet. See Section 3.4.5 for the equivalent length of the  
fittings.  
3.2.5.1 Field Wiring to Auxiliary Control Panel  
The auxiliary control panel controls the inlet damper  
(if used). The auxiliary control panel does not have to  
be mounted on or near the boiler; it can be remotely  
mounted.  
Use 16GA MTW Wire for all field wiring. See  
Section 6 for the logic and wiring diagrams of this  
auxiliary control panel and the sealed combustion  
boilers.  
There are five (5) field run wires between the boiler  
and its auxiliary control panel; three (3) for main  
power supply and two (2) wires for boiler  
interconnect.  
3.3.2 Flue Gas Outlet Duct  
1. The main power supply (G/H/N) must come from  
the same boiler that the damper is connected to.  
The installation must follow the vent manufacturer's  
instructions in all respects including proper joining and  
sealing of the tubing and fittings, clearances to  
combustible materials and installation of firestops.  
2. Remove the blue jumper wire in the terminal block  
on the boiler when wiring.  
There are also five (5) field run wires between the  
auxiliary control panel and the inlet damper assembly;  
three (3) to the damper actuator and two (2) to the  
limit switch.  
Page 5  
Thermific® Gas-Fired Boiler  
Installation  
3.3.3 Exhaust Vent Connection at the Boiler  
from the outlet of the boot tee/ 135º tee to the inlet of  
the elbow. In addition, for sidewall venting, it is very  
important to provide a downward pitch of at least 1/4  
inch per foot of run from the termination at the wall  
toward the boiler for proper drainage of the condensate  
and for buoyancy assist of the flue gas. Furthermore,  
do not locate sidewall terminations over area of  
pedestrian or vehicular traffic due to potential  
Pitch toward boiler  
1/4" per foot min.  
condensate drippage and ice build-up. See Section 3.4  
Clearances for more information.  
6' Min.  
When joining the double wall tubing and fittings, it is  
important to orient the male end of the section toward  
the boiler. The female end is positioned away from  
the boiler towards the vent terminal. Follow the vent  
manufacturer's instructions for proper installation.  
Boot Tee/  
135o Tee  
Trap Loop  
3.3.4 Flue Gas Termination  
3" Min.  
Condensate Drain  
To sewer trap  
Outside Plate  
Centering  
Support  
Plate  
Cover Plate  
Fastener  
or condensate pump.  
Recommended  
termination  
(refer to text).  
Sealant  
At the outlet of the boiler, an adjustable or fixed length  
(minimum 2 feet for clearance from inlet duct;  
maximum 3 feet for proper lift) section may be  
utilized. This section must be secured to the outlet  
collar by a minimum of 4 sheet metal screws spaced at  
approximately 90 degree intervals.  
Sealant  
Even though the unit is classified as a Category I  
boiler (Non-pressurized-non condensing), there are  
certain abnormal conditions which may cause  
condensation in the flue vent. Therefore, it is  
recommended that a tee cover with a drain be provided  
at the bottom of the boot tee/135º tee. For proper  
disposal of the condensate, corrosion resistant tubing  
or plastic tubing should be connected to the drain  
nipple. Before connecting the tubing to the tee cover  
nipple, the trap loop must be primed by pouring a  
small quantity of water into the drain line. The  
condensate drain line can be routed to a sewer drain  
trap or pump. Consult the vent manufacturer's  
instructions for proper installation of drain line.  
12" Min.  
The exhaust vent termination must be a P-K  
recommended device. There are four approved  
sidewall terminations:  
ƒ
ƒ
ƒ
ƒ
90º elbow pointing down, or  
Two 45º elbows pointing down, or  
45º elbow pointing down, or  
Standard tee pointing up/down.  
Important: The equivalent length of the chosen  
termination must be included in the calculation of the  
maximum allowable equivalent length. See Section  
3.4.5 for equivalent lengths.  
In transitioning from horizontal to vertical, a double  
wall boot tee/135º tee must be installed (not a standard  
tee). If the flue gas exhaust is to be routed through the  
sidewall, a minimum vertical rise of 6 feet is required  
Page 6  
Thermific® Gas-Fired Boiler  
Installation  
Whichever termination is chosen, it must be double  
wall vent certified under UL 1738, or ULC-636.  
When installing a sidewall exhaust system the  
termination must be backed by a metal plate secured to  
the wall as shown in the figure.  
unrestrictive type similar to the figure above. Elbows  
are also acceptable.  
3.4.5 Equivalent Length of Fittings  
Fitting Description  
90º Elbow  
45º Elbow  
Equivalent Length  
10 feet  
5 feet  
Correct rain cap,  
unrestricted.  
Typical incorrect  
rain cap.  
Rain Cap  
10 feet  
Boot Tee/135º Tee  
10 feet  
Standard Tee Used as a 10 feet  
Vent Termination  
3.4 CLEARANCES  
If the exhaust vent is routed through the roof, the  
termination must be either the same type as described  
for a sidewall installation or a rain cap. The preferred  
method to terminate the exhaust vent is with a rain cap  
to minimize the drippage of condensate onto the roof  
and ice build-up. The rain cap should be an  
In addition to any clearance requirements in Sections  
3.1 and 3.3 the following clearances must be  
maintained for inlet and vent components.  
3.4.1 Sidewall Installations  
Flue Gas  
Outlet  
Flue Gas  
Outlet  
Combustion  
Air Intake  
2' to snow  
line  
Page 7  
Thermific® Gas-Fired Boiler  
Installation  
If the air inlet and/or exhaust vent terminal are through  
the sidewall, clearances from other exhaust/inlet,  
windows, doors, building openings, snow line, etc  
must be as shown in the figure above.  
Clearances which must be maintained when both inlet  
and exhaust are through the roof are shown in the  
figures above.  
There must be either 5' vertical separation or 10'  
horizontal separation between the flue gas outlet and  
the combustion air inlet.  
3.4.3 Minimum Clearance for Boiler  
Connections  
The bottom of the flue gas outlet must be located at  
least 12 inches above finish grade or snow line, but  
must be at least 7 feet above finish grade when located  
adjacent to a public walkway. It must also have a  
minimum clearance of 4 feet horizontally from, and in  
no case above or below, (unless a 4 foot horizontal  
distance is maintained,) electric meters, gas meters,  
regulators and relief equipment.  
There are special considerations needed when  
installing the air inlet and exhaust duct systems  
because of the orientation of these connections on the  
boilers.  
3.4.3.1 Series 700, 1000, 1200  
Air Inlet  
Round  
3.4.2 Rooftop Installations  
10' min.  
Damper  
Flue Gas  
Outlet  
Combustion  
Air Inlet  
90o Elbow  
4' min.  
4' min.  
26" Min.  
*
above  
snow line  
* Dimension shown above is based on 12" round  
ductwork.  
10' min.  
A minimum clearance of 26 inches is required on the  
left side of the boiler to permit the connection of the  
air inlet duct to the boiler.  
Vent  
Flue Gas  
Outlet  
Combustion  
Air Inlet  
4' min.  
4' min.  
above  
snow line  
Page 8  
Thermific® Gas-Fired Boiler  
Installation/Operation  
3.4.3.2 Series 1500, 1700, 2000  
normally closed contacts on the time delay relay  
and energizes the coil on the relay in the Auxiliary  
Control Panel. The relay will in turn energize the  
damper actuator to open the damper. When the  
damper is in the full open position, the limit switch  
will close and supply power to the contactor for  
the blower motor.  
Exhaust  
Vent  
Air Inlet  
Round  
Damper  
90o Elbow  
During this time (about 20 seconds), the air switch  
will indicate low air flow with the "LowAir"  
indicator. This indicator will remain on until  
sufficient air flow is sensed. If the air flow switch  
is not closed in 120 seconds, the time delay relay  
will open its normally closed contacts. This will  
turn off the blower motor and close the inlet  
damper. The "Low Air" indicator will remain  
illuminated and the boiler will not operate.  
Transition  
Duct  
27" Min.*  
31"  
*
Boot Tee/  
135o Tee  
4.2 COMBUSTION OPERATING CONDITIONS  
The combustion air characteristic of the burner in this  
boiler is factory set at a condition of utilizing  
approximately 50% excess air at room temperature  
(70ºF). Therefore, when taking combustion air from  
the outdoors in a direct vent system, adjustment of the  
combustion air damper linkage should not be made  
until the carbon dioxide or oxygen reading is referred  
to this condition.  
To Drain  
24"  
44" Min.  
*
* Dimension shown above is based on 12" round  
ductwork.  
A minimum of 44 inches is required behind the boiler  
to fit the inlet and exhaust connections.  
The density of cold outdoor air will be greater than  
warm air taken from inside the building. Thus, the  
combustion air blower with outdoor air will deliver a  
higher air density flow to the burner.  
The figure above suggests a duct arrangement using  
standard duct pieces that will maintain this minimum  
clearance of 44 inches.  
A boiler can be subjected to varying combustion air  
temperatures. You must put some thought into the  
air/fuel adjustments to prevent hard start and/or light  
off rumbling problems. Due to a wide range of  
operating conditions, Patterson-Kelley developed a  
guide for different conditions.  
P-K recommends that the service technician observe  
the combustion air temperature range. Identify the  
temperature operating conditions of your boiler.  
The operational range setting for O2 is 6.0% to 8.0%.  
Insert your 100º F operating temperature range in the  
chart below. Start with the Minimum Temperature at  
the top of the chart; insert temperatures using 5º F  
increments.  
4.0 OPERATION  
4.1 SEQUENCE OF OPERATION  
This sequence applies if the optional inlet damper  
assembly and auxiliary control panel are used. If not  
the standard Thermific® control sequence applies.  
(Replaces step #6 of the Sequence of Operation in the  
Installation and Owner's Manual. "TBIG.")  
6. The programmer first energizes Terminal 4 which  
supplies power to the airflow switch and initiates  
the adjustable 120 sec. timer on the time delay  
relay. Terminal 4 also supplies power through the  
Page 9  
Thermific® Gas-Fired Boiler  
Operation/Maintenance  
When the chart is completed, set up your boiler's  
combustion to the corresponding information at the  
temperature relative during the time of the start up.  
4.2.1 Combustion Air Requirement, SCFM  
Series Series  
Series  
1200  
291  
Series  
1500  
364  
Series  
1700  
413  
Series  
2000  
501  
Enter your 100º F  
operational range.  
% Oxygen  
% Carbon  
Dioxide  
700  
170  
1000  
251  
8
7.2  
7.3  
7.4  
7.4  
7.5  
7.5  
7.6  
7.6  
7.7  
7.7  
7.8  
7.8  
7.9  
8
7.9  
7.8  
7.7  
7.6  
7.5  
7.4  
7.3  
7.2  
7.1  
7.0  
6.9  
6.8  
6.7  
6.6  
6.5  
6.4  
6.3  
6.2  
6.1  
6
5.0 MAINTENANCE  
Maintenance procedures for the Direct Vent option are  
the same as for the standard Thermific® model. Refer  
to the Thermific Installation and Owner's Manual.  
"TBIG," latest edition.  
8
8.1  
8.1  
8.2  
8.2  
8.3  
8.3  
Important: measure combustion air temperature at the  
unit; do not assume the combustion air temperature is  
the same as the outside air temperature.  
Page 10  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.0 WIRING DIAGRAMS  
6.1 ON-OFF SERIES 700, 1000, 1200  
Wiring Diagram  
Page 11  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1 ON-OFF SERIES 700, 1000, 1200  
Logic Diagram  
Page 12  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1A ON-OFF IRI SERIES 700, 1000, 1200  
Wiring Diagram  
Page 13  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1A ON-OFF IRI SERIES 700, 1000, 1200  
Logic Diagram  
Page 14  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1B LO-HI LO  
Wiring Diagram  
Page 15  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1B LO-HI LO  
Logic Diagram  
Page 16  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1C LO-HI-LO IRI  
Wiring Diagram  
Page 17  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1C LO-HI-LO IRI  
Logic Diagram  
Page 18  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1D ON-OFF SERIES 1500, 1700, 2000  
Wiring Diagram  
Page 19  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1D ON-OFF SERIES 1500, 1700, 2000  
Logic Diagram  
Page 20  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1E ON-OFF IRI SERIES 1500, 1700, 2000  
Wiring Diagram  
Page 21  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.1E ON-OFF IRI SERIES 1500, 1700, 2000  
Logic Diagram  
Page 22  
Thermific® Gas-Fired Boiler  
Wiring Diagrams  
6.2 AUXILIARY CONTROL PANEL  
6.2.1 On-Off Auxiliary Control Panel  
Page 23  
Page 24  

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