Q35 Automatic Vent Damper System Product Bulletin - ShanControls

Q35 Automatic Vent Damper System
The Q35 energy saving, high-efficiency, automatic vent
damper system retains heat that is normally wasted
through the open flue when the appliance is not firing.
The Q35 consists of a Y15 damper, M35 actuator, and
Y84 wiring harness. The damper section is available in
sizes from 102 mm (4 in.) through 305 mm (12 in.)
nominal duct diameter.
❑ Stainless Steel Duct, Blade,
and Skirt Construction
❑ Redundant End Position
Switches
❑ Position Indicator and LED
(Light-Emitting Diode)
Features and Benefits
Heating Line Product Guide 435.0
Vent/Flue Dampers Section
Product Bulletin Q35
Issue Date 1098
Figure 1: Q35 Automatic Vent Damper
Provides a durable, resilient to harsh
environments, positive sealing (minimizing flue
byproducts) system
Allows precise blade positioning for unrestricted
byproducts of combustion flow
Provides a visible indication of blade position and
appliance power
© 1998 Johnson Controls, Inc. 1
Code No. LIT-4350750 www.johnsoncontrols.com

Application
The Q35 damper system can be used with boilers,
furnaces, and other gas-fired appliances equipped with
a vent connection 305 mm (12 in.) diameter or less.
Models are available for standing pilot or electronic
ignition systems.
Note: In standing pilot applications, a stack
assembly model with a vent hole must be
used (see the Ordering Information section).
The Y84 wiring harness is used to connect the M35
actuator to the appliance. The Y84 electrically
interlocks the damper system to the appliance.
Unplugging either end results in a system shutdown.
In addition, the Y84 incorporates a circuit that blows
a special fuse found in most electronic ignition
controls. This is designed to prevent system
operation if a bypass plug, supplied with the ignition
control, is later used in place of a damper.
The damper assembly must be used only in
conjunction with redundant gas valves (main burner
gas must pass through both valve seats). The Q35
must not be used with valves that can be manually
opened.
Operation
The damper actuator opens and closes the damper
blade upon demand of the system thermostat.
The damper must be in the open position before the
main burner circuit is energized. It will remain open
while the main burner is operating.
A damper blade position indicator and a green light
are visible on the front label of the actuator. The light
signifies that power from the thermostat has opened
the damper and that power is available to the
appliance for main burner ignition. See Figure 2.
2 Q35 Automatic Vent Damper System Product Bulletin
AUTOMATIC DAMPER
M35BA-1
INPUT 24V 50/60 Hz
OPERATING CURRENT: 0.2A
CONTACT RATING: 2A STEADY
5A INRUSH
POSITION INDICATOR
OPEN ROTATION
CLOSED
INDICATOR LIGHT
"ON" - DAMPER OPEN
Figure 2: Label Diagnostic Indicators
Sequence of Operation
The Q35 operates in the following manner:
1. The damper is in the closed position.
2. The thermostat contacts close on a call for heat.
3. The M35 actuator rotates the damper blade to
the open position. Power is available for main
burner ignition (green light is on).
4. The system thermostat reaches setpoint and
contacts open.
5. The burner circuit is de-energized and the M35
closes the damper.
6. The system is now ready for the next heating
cycle.

Manual Opening
If an actuator failure occurs and a replacement is not
readily available, the appliance may temporarily be
returned to service. After moving a wire lead inside
the actuator to disable the motor (see Figure 3), the
flat shaft is easily turned with a wrench or pliers to
the open position, providing burner operation on
each thermostat cycle. Condensed instructions are
printed on the circuit board.
Remove wire
from here.
Place it here.
Figure 3: Moving Motor Lead Wire
Figure 4: Manual Rotation
After turning the shaft, the damper will remain in the
open position and supply power to the ignition circuit
on demand of the system thermostat. However, the
vent damper will not provide energy savings until a
replacement actuator is obtained from the original
equipment manufacturer or an authorized
Johnson Controls distributor.
Q35 Automatic Vent Damper System Product Bulletin 3

Dimensions
M35AA-1
Table 1: Q35 Dimensions
4 Q35 Automatic Vent Damper System Product Bulletin
38
1.50
81
3.19
Figure 5: Dimensions, mm (in.)
Duct Size/“A” Inlet Opening “B” Outlet Outside Diameter “C” Height
84
3.30
Standing Pilot System
84
3.30
30
1.20
138
5.42
30
1.20
138
5.42
Electronic Ignition System
mm in. mm in. mm in.
102 4.00 100 3.95 152 6.00
127 5.00 126 4.95 152 6.00
152 6.00 151 5.95 152 6.00
178 7.00 177 6.95 171 6.75
203 8.00 202 7.95 197 7.75
230 9.00 228 8.95 249 9.75
255 10.00 254 9.95 249 9.75
305 12.00 306 11.95 300 11.75

Ordering Information
1st
Letter
Damper
Operator
Wiring
Harness
Q 3 5 _ _ - _ _
Customer-specific Requirements
2nd
Letter Stack Assembly Stack Description
C M35BA Y84 A Y15AE or *Y15ME 102 mm (4 in.)
without vent hole
F M35BC Y84 B Y15MF or *Y15MF 102 mm (4 in.)
with vent hole
H M35BC None C Y15NE or *Y15NE 127 mm (5 in.)
without vent hole
D M35BB Y84 D Y15NF or *Y15NF 127 mm (5 in.)
with vent hole
E Y15PE or *Y15PE 152 mm (6 in.)
without vent hole
F Y15PF or *Y15PF 152 mm (6 in.)
with vent hole
G Y15QE or *Y15OE 178 mm (7 in.)
without vent hole
H Y15QF or *Y15OF 178 mm (7 in.)
with vent hole
J Y15RE or *Y15RE 203 mm (8 in.)
without vent hole
K Y15RF or *Y15RF 203 mm (8 in.)
with vent hole
L Y15SE or *Y15SG 230 mm (9 in.)
without vent hole
M Y15SF or *Y15SH 230 mm (9 in.)
with vent hole
N Y15TE or *Y15TG 255 mm (10 in.)
without vent hole
P Y15TF or *Y15TH 255 mm (10 in.)
with vent hole
Q Y15HG or *Y15UG 305 mm (12 in.)
without vent hole
R Y15HH or *Y15UH 305 mm (12 in.)
with vent hole
*Indicates a short duct damper.
The presence of a particular construction in this information does not guarantee its availability. Consult Johnson Controls
for available constructions.
Figure 6: Ordering Matrix
Q35 Automatic Vent Damper System Product Bulletin 5

6 Q35 Automatic Vent Damper System Product Bulletin
Notes

Notes
Q35 Automatic Vent Damper System Product Bulletin 7

Specifications
Product Q35 Automatic Vent Damper
Voltage 24 VAC, 50/60 Hz
Available
Sizes
8 Q35 Automatic Vent Damper System Product Bulletin
D o (Effectiveness)
Nominal Diameter Intermittent Standing
mm in. Ignition Pilot
Material Stack/Blade: 430 Stainless Steel
Cover/Case: Galvanized Steel
Maximum
Operating
Temperature
Y84
Termination
Agency
Listing
Specification
Standards
102 4.00 0.006 0.065
127 5.00 0.004 0.041
152 6.00 0.002 0.028
178 7.00 0.002 0.021
203 8.00 0.002 0.017
230 9.00 0.069 0.081
255 10.00 0.070 0.079
305 12.00 0.085 0.092
Actuator: 66°C (150°F)
Stack: 274°C (525°F)
Actuator End: Board Edge Connection (Standard)
Molex Receptacle (Optional)
Appliance End: Molex Plug (Standard)
Bare or Terminals (Optional)
Q35 components Y15 and M35
IAS (AGA, CGA) Certificate Number C2154004
ANSI Standard Z21.66
CAN1-2.28-M81
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from
misapplication or misuse of its products.
Refer to the Q35 Series Technical Bulletin (LIT-121340 and LIT-121515) for necessary information on the installation, use, and servicing of this product.
Controls Group www.johnsoncontrols.com
507 E. Michigan Street FAN 435.0
P.O. Box 423 Heating Line Product Guide
Milwaukee, WI 53201 Printed in U.S.A.