Field controls SWG11-5, SWGII-6, SWG-8 User Manual
SIDEWALL POWER VENTER KIT
Model: SWGII-5,6 AGA and SWG-8*
FOR COMMERCIAL WATER HEATERS
TYPICAL VENTING SYSTEM COMPONENTS:
*Patented
PART
NUMBER
239-81764-00
239-81765-00
239-81766-00
239-81767-00
239-82148-00
DESCRIPTION APPLICATION
SWGII-5 POWER VENTER,
CK-41 24 VOLT CONTROL KIT
SWGII-5 POWER VENTER,
CK-81 MILLIVOLT CONTROL KIT
SWGII-6 POWER VENTER,
CK-41 24 VOLT CONTROL KIT
SWGII-6 POWER VENTER,
CK-81 MILLIVOLT CONTROL KIT
SWG-8 POWER VENTER,
CK-41 24 VOLT CONTROL KIT
DO NOT DESTROY
THESE INSTRUCTIONS MUST REMAIN WITH EQUIPMENT
COMMERCIAL WATER HEATERS WITH 24 VOLT
CONTROLS WITH INPUT RATINGS OF UP TO 290,000
BTU/HR.
COMMERCIAL WATER HEATERS WITH MILLIVOLT
CONTROLS WITH INPUT RATINGS OF UP TO 290,000
BTU/HR.
COMMERCIAL WATER HEATERS WITH 24 VOLT
CONTROLS WITH INPUT RATINGS GREATER THAN
290,000 BTU/HR. UP TO 416,000 BTU/HR.
COMMERCIAL WATER HEATERS WITH 24 VOLT
CONTROLS WITH INPUT RATINGS GREATER THAN
290,000 BTU/HR. UP TO 416,000 BTU/HR.
COMMERCIAL WATER HEATERS WITH 24 VOLT
CONTROLS WITH INPUT RATINGS GREATER THAN
415,000 BTU/HR.
CONTROL KITS
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1. For 24 volt control systems (intermittent pilot ignition): CK-41 control kit with the following components: Junction box
with mounted pressure switch and relay base, 24 volt relay for controlling power venter motor, 1 ft. length of 0.25"
aluminum tubing, 0.25" tubing connector, flexible metal clad conduit, GSK-3 spillage switch, wiring harness (30 ft.
length) to connect power venter control to water heater controls, 3 cable clamps to fasten the harness.
2. For millivolt control systems (standing pilots): CK-81 control kit with the following components: Junction box with
mounted pressure switch, 115V to 24V transformer, and 24 volt relay, 1 ft. length of 0.25" aluminum tubing, 0.25"
tubing connector, flexible metal clad conduit, GSK-3 spillage switch, wiring harness (30 ft. length) to connect power
venter control to water heater controls, 3 cable clamps to fasten the harness.
GENERAL SYSTEM OPERATION
POWER VENTER KITS FOR 24 VOLT CONTROLS (CK-41 CONTROL KIT)
1. The water heater aquastat contacts close and the flue damper (if part of water heater) opens. When the damper
opens all the way, the end switch contacts in the damper motor close, completing the 24 volt circuit to the CK-41
control box causing the motor relay contacts to close and start the power venter motor.
2. When the power venter blower reaches operating speed, the resulting vacuum cause the pressure switch contacts to
close. The 24 volt control circuit flows through the pressure switch contacts in the CK-41 control box and through the
normally closed spillage switch contacts on the draft hood, completing the circuit to the ignition module on the water
heater control box. The ignitor lights the pilot and the main gas valve opens causing the main burners to light.
3. If the venting system becomes disconnected or plugged between the power venter and the water heater vent
connection, the flue products will spill out of the draft hood relief opening, heat up the spill switch temperature disc
and cause the contacts to open and interrupt power to the ignition module causing the gas valve to close and stop the
burners. If the power venter blower fails to operate, the pressure switch contacts will not close and the burners remain
off.
4. When the aquastat is satisfied, the contacts open and stop the power venter, interrupting power to the ignition module
and gas valve, and the flue damper closes.
POWER VENTER KIT FOR MILLIVOLT CONTROLS (CK-81 CONTROL KIT)
1. When the aquastat contacts close, the 24 volt circuit is completed from the transformer, through the wiring harness
and switch contacts, and through the relay coil causing the motor relay contacts to close and start the power venter
blower.
2. When the blower reaches operating speed, the vacuum near the blower causes the pressure switch contacts to close
and complete the millivolt circuit through the normally closed spill switch contacts to the gas valve, allowing main gas
to flow to the burners and ignite from the pilot.
3. If the venting system becomes disconnected or plugged between the power venter and the water heater vent
connection, the flue products will spill out of the draft hood relief opening, heat up the spill switch temperature disc
and cause the contacts to open and interrupt the millivolt circuit to the gas valve and stop all gas flow. If the power
venter blower fails to operate, the pressure switch contacts will not close and the burners remain off. If the pilot
becomes extinguished, the thermopile stops generating millivolt power and the gas valves remain closed until the pilot
is relit.
4. When the aquastat is satisfied, the contacts open and stop the power venter, causing the power to be interrupted to
the ignition module and gas valve, and the flue damper closes.
INSTALLATION SAFETY INSTRUCTIONS
CAUTION: This device must be installed by a qualified installer in accordance with the
manufacturer's installation instructions. Appliances should have a minimum of 75%
combustion efficiency or have a maximum measured flue gas temperature of 550EF at the
inlet of the power venter.
1. The power venting system must be installed by a qualified installer. "Qualified Installer"
shall mean an individual who has been properly trained or is a licensed installer. The installer must write or imprint his name, phone number and date of installation on the
installation tag. The tag should be attached to the system control kit box or power
venter unit. Also, the included adhesive "Warning!" label should be attached to the
Control Kit box, as shown in Figure 1, and the installers name be written on it. Recording burner and venting system
initial operational information is strongly recommended as a guide for service or burner tune-up. Enter this on the back
page of this manual. The appropriate wiring diagram for the type of controls on the water heater must be affixed to the
water heater jacket upon completion of the installation.
Figure 1
2. Safety inspection of a venting system should be performed before and after installing a power venting system on an
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existing or new appliance. Procedures to follow are those recommended by the National Fuel Gas Code,
A.N.S.I.Z223.1, or refer to General Installation Inspection section of this manual.
3. Plan the vent system layout before installation to avoid the possibility of accidental contact with concealed wiring or
plumbing inside walls.
4. Single wall vent pipe (refer to Diagram B) may be used to join an appliance to the venting system, but if proper
clearances cannot be maintained from combustible materials, Class B Vent Pipe should be used. Refer to national or
local codes for guidelines.
5. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.
6. This equipment is designed to overcome minor negative pressure conditions. To ensure extreme negative pressure
does not exist, follow General Installation Inspection of this manual.
7. The commercial water heaters for the SWGII-5 and 6 power venters have draft hoods and each kit includes a GSK-3
spillage switch which must be installed on the bottom of the draft hood to detect spillage of flue products due to
inadequate venting draft or vent system blockage. In the event of excessive flue spillage from the draft hood, the
spillage switch will interrupt power to the gas valve to stop the burners. Refer to the installation instructions for the
spillage switch in the installation section of these instructions.
8. The power venter must be installed downstream of the appliance draft hood.
INSTALLATION OF SWG POWER VENTER
UNIT SIZING CHART
MAXIMUM BTU/HR
INPUT*
MAX. EQUIVALENT FEET OF VENT PIPE MODEL
AT MAXIMUM INPUT AT 60% OF MAXIMUM INPUT
VENTING WITH VENT
PIPE SIZE
16 44 4”
290,000
51 100 5”
95 100 6”
28 78 5”
416,000
68 100 6”
100 100 7”
505,000 65 65 10” SWG-8
*
Do not exceed maximum BTU/HR input rating.
NUMBER
SWGII-5
SWGII-6
PROCEDURE FOR CALCULATING TOTAL EQUIVALENT PIPE LENGTH IN FEET
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1. Calculate the total equivalent feet for each type of fitting used in the venting system from the chart below.
2. Calculate the total amount of feet for the straight lengths of vent pipe.
3. Add the equivalent feet for the fittings with the total amount of feet of straight lengths. This will approximate the total
equivalent feet of the vent system.
EQUIVALENT LENGTH (FEET) OF VENT PIPE FOR VENT PIPE
VENT PIPE FITTINGS
VENT PIPE DIAMETER
3” 4” 5” 6” 7” 8” 9” 10”
TEE 19 25 31 38 44 50 56 63
90° ELBOW 5 7 9 11 12 14 16 18
45° ELBOW 3 4 4 5 6 7 8 9
d/D
SUDDEN REDUCER
OR INCREASER
FOR THREE
RATIOS* (d/D)
¼ 8 11 14 17 19 22 25 28
½ 5 7 8 10 12 13 15 17
¾ 2 3 3 4 4 5 6 6
*Reducer or increaser ratio (d/D) small diameter divided by the larger diameter. (See Figure
2) Example 4" to 8" reducer: The reducer ratio is d/D = 4/8 = 1/2. To estimate the equivalent
foot length for the fitting, use the smaller pipe diameter for the equivalent length figure.
Example 4" to 8" reducer; the reducer ratio is 1/2 and the smaller pipe diameter is 4". So,
from the chart, the equivalent feet would be 7 feet.
Figure 2
Example 1: System Pipe Size = 4" Example 2: System Pipe Size =
10"
Step 1 Two 4" 90E Elbows @ 7 feet each = 14 Ft. Step 1 Fifteen 2 Foot Lengths of 10” Pipe = 30 Ft.
Step 2 Ten 2 Foot Lengths of 4" Pipe = 20 Ft. Step 2 One 10” 90° Elbow = 18 Ft.
Step 3 Total Equivalent Feet = 14 Ft. + 20 Ft. = 34 Ft. Step 3 One 8” to 10” Reducer (Use ¾) = 5 Ft.
Step 4 Total Equivalent Feet = 30 Ft. + 18 Ft. + 5 Ft. = 53 Ft.
CAUTION: Failure to install, maintain and/or operate the power venting system in accordance with manufacturer's
instructions will result in conditions which may produce bodily injury and/or property damage.
1. Remove power venter from box and inspect unit for damage. If the carton has been crushed or mutilated, check unit
very carefully for damage. Rotate blower wheel to insure that the motor and blower wheel rotate freely. DO NOT
install if any damage is apparent. Refer to unit sizing chart to check proper venting sizing.
2. Location of the termination of the venting system should be installed in accordance with the National Fuel Gas Code,
A.N.S.I.Z223.1, and/or manufacturer's recommendations which are applicable. See requirements below or refer to
installation location Diagram A for typical locations.
a. The exit termination of mechanical draft systems shall not be less than 7' above grade when located adjacent to
public walkways.
b. A venting system shall terminate at least 3' above any forced air inlet located within 10'.
c. The venting system of other than a direct vent appliance shall terminate at least 4' below, 4' horizontally from, or
1' above any door, window or gravity air inlet into the building.
d. The vent termination of a direct vent appliance with an input of 50,000 BTU's per hour or less, shall be located at
least 9" from any opening through which vented gases could enter the building. With an input over 50,000 BTU's
per hour, a 12" termination clearance shall be required.
e. The vent termination point shall not be installed closer than 3' from an inside corner of an L-shaped structure.
f. The vent termination should not be mounted directly above, or within 3' horizontally from an oil tank vent or gas
meter.
g. The bottom of the vent terminal shall be located at least 12" above finished grade.
Diagram A
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Figure 3
Figure 4
3. After determining the location of the venting system termination point (See Diagram A), cut a square hole through the
wall 1" larger than the outer pipe diameter of the power venter. Mount the power venter through the wall, keeping the
outer pipe centered in the hole. (See Figure 3) Fasten the power venter to the outside wall with appropriate fasteners.
Seal the edges of the power venter base plate to the wall with a high temperature silicone sealant. DO NOT enclose
the spaced plates on the power venter body. This will result in reduced cooling of the power venter body. Galvanized
metal sheets may be installed over surrounding building surfaces to protect building materials for degradation by flue
gases. Brick or tile may be placed on the ground below the power venter to protect the soil and vegetation from the
effects of heated exhaust air. The power venter should be placed so that vegetation and other objects are not in direct
contact with the power venter or blocking the outlet. Snow should be cleared from the outlet area as needed. Wood or
vinyl siding should be cut so that the unit mounts directly on the wall board to provide a stable support. If the siding is
greater than 1/2" thick use a spacer plate or board behind the power venter mounting plate. (See Figure 4)
NOTE: If mounting the power venter through a combustible wall material and the flue gas temperature is above 400EF at
the power venter inlet, line the square hole with a piece of corrosion resistant sheet metal or non-combustible material.
The liner piece should be the same width as the wall section. (See Figure 3) The power venter has maximum flue gas
temperature of 550EF at the power venter inlet. Figure 7 shows how the airflow pattern through an SWG reduces the
required clearances to combustibles. For installation in wall thickness over 8-inches, use an SWG Series Through Wall
Extension Kit, Model PEK.
4. Remove the end pipe cover screws on the sides of the outside pipe and
remove end pipe cover. Then mount the backing plate over the outer pipe and
route the flexible conduit and pressure switch tube through the holes provided
in the backing plate. Fasten the backing plate to the inside wall with appropriate fasteners. (See Figure 5) Re-install end pipe cover and screws.
CONNECTING POWER VENTER TO APPLIANCE
Venting system should be installed and supported in accordance with the National
Flue Gas Code A.N.S.I.Z223.1, or in accordance with any local codes. A vent
pipe connector shall be supported for the design and weight of the material
Figure 5
employed, to maintain clearances, prevent physical damage and separation of joints. A vent pipe increaser or reducer
may be required for connecting the power venter to the vent system. If needed, place the reducer close to the power
venter. Smaller vent pipe sizes than a chimney-vented system may be used for the vent system.
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