Bryant 907 Series A 12-907, 16-907, 24-907 Electronic Air Cleaner Installation Instructions

Installation Instructions
INTRO DUCTION
The Bryant Model 907 Series. A Electronic Air
Cleaner is available in three sizes: 12-907 (1200
CFM), 16-907 (1600 CFM), and 24-907 (2400 CFM).
They are designed for use with residential and light
commercial forced-air heating and/or cooling systems
and can be installed in a vertical or horizontal sec-
tion of a typical return air duct system.
The electronic components of the unit convert the 120
VAC of the power supply to 7200 VDC which imparts
an electrical charge to airborne particles such as
smoke, bacteria, pollen, and dust. These charged par-
ticles are then attracted by the dust- collecting media,
thus purifying the airstream.
The electronic air cleaner consists of:
1. A cabinet containing the air cleaning assembly.
2. A power door assembly.
See Figure 2. |
CABINET. A casing encloses three sections that
make up the air cleaning assembly. These sections
are: a a
1. Mechanical prefilter. ‘An expanded metal first-
stage filter that removes lint and larger dust
particles. |
2. Ionizer section. Consists of tungsten wires (that
receive a positive charge) mounted between grounded
steel channels and supported by polyester, glass-
reinforced insulators.
3. Collector section. Consists of two grounded wire
grills and one center plate (that receives a positive
charge) with two fiber glass dirt collecting “media”
pads, one on either side: of the center plate. See
Figure 11.
POWER DOOR ASSEMBLY. See Figure 10. The
door assembly consists of:
1. A power indicator light, ON-OFF switch, and lock
knob installed on the door. cover. |
2. A door base plate contains an encapsulated power
pack, a surge resistor, and wiring that are mounted
internally. A line voltage disconnect (male plug) and
high-voltage spring bus-bar is mounted on the base
plate externally. Six screws must be removed to ex-
pose the power pack and wiring.
Power Pack. The supply circuit to the power pack,
which is wired across the system air blower, is con-
trolled by an ON-OFF power switch. With the power
switch ON (assuming power door locked. and air
ELECTRONIC AIR CLEANER
907
Sizes 12, 16, 24
Series B
Cancels: 39907D6 i 39907D7
| 8/15/72
A70009
lodel 907 Electronic Air Cleaner
GROUNDED PLATE—
REPLACEABLE GOLLECTING PAD—~_ №
POSITIVELY CHARGED GRID
REPLACEAB
COLLECTING PAD > |
GROUNDED PLATE `
IONIZER
PREFILTER
CLEAN AIR
I~
i
| 120-VOLT
| POWER SUPPLY
7200 VDC
27 TO 1ONIZER
< & POSITIVE
<> Á env
DUST-LADEN
RETURN AIR
GROUNDED
< case
- POWER PACK
A68175
Figure 2—Air Cleaner Components
I ELECTRI CAL”
Scr |
Ÿ Lo
A >
|
3
> 4%
E
ON-OFF.
a SWITCH N INDICATOR
LIGHT
D . LoL ' +
| SX REMOVABLE
POWER... В
À poor Са |
N =)
To Un
> E 8 ZA o
| ¢ > A70003
4 o
Figure 3—Dimensional Drawing
TABLE |—DIMENSIONS .
Model A С D E
12-907 31-1/4 20-3/16 | 17-11/16 24
16-907 31-1/4 25-11/16 | 23-3/16: 24
24-907 33-1/4 31-3/16 28-11/16 26
TABLE I—PHYSICAL DATA —.
Model 12-907 16-907 24-907
Air Volume Range CFM | 600-1200 | 800-1600 1400-2400 -
Filter Area o O 3
Face area sq ft] 337. 4.36 - 5.76 …
Nominal size in | 18x25 24 x. 26 . 30x 28
Electrical Data “ 120 volts AC,
Input (to power door) single phase, 60 Hertz
Output to unit - 7200 volts DC, 1.7 Milliamps E
Approx Shipping Weight Ibs 48 54 . | 61 da
TABLE III— PRESSURE DROP AT VARIOUS AIRFLOWS .
12-907 16-907 “24-907.
CEM Pressure Drop CEM Pressure Drop | | CEM Pressure Drop |
Inches wc Inches wc - - inches wc
600 0.05 800 0.05 1400'- | 0.09*.
700 0.07 1000 0.08 1600 ° 0.12
800 0.085 “1200 0.11 1800 045
900 0.107 1400 0.15 - ,2000- .. 10.18:
1000 0.13 1600 0.19 2200 | ..... 0.22
1100 0.16 o 2400 |... 026. .
1200 0.19 =
Note: Using the electronic air cleaner on air duct systems “designed for airflows Tower than
600 CFM for Model 12-907, 800 CFM for 16-907, and 1400 CFM for 24-907 is not recommended.
2.
blower operating), 120-VAC-10% single phase,
60-Hz current is applied to the power pack trans-
former. The output of the transformer secondary is
approximately 3600 VAC and alternately charges two
capacitors through two: silicon rectifiers. The total
charge across both capacitors results in“a power pack
output of approximately 7200 VDC; therefore, the cir-
cuit is classed as a voltage doubler circuit.
NOTE: Power packs are completely encapsulated
and not field repairable. The surge resistor is ex-
ternal to the power pack and can be readily replaced
in the field. |
Installation of the Model 907 consists of the following
steps (sections):
I. Locating the Unit
II. Connecting the Air Ducts
III. Making Electrical Connections
IV. Start-up and Adjustment
In addition, the following sections are also included:
V Maintenance
VI. Recommended Service Procedures
IMPORTANT—Read Before Installing
1. Check local codes and ordinances for additional
requirements pertaining to installation of unit.
2. Check electrical power supply to building to be
sure rated voltage, frequency, and phase correspond
to that on unit rating plate.
SUPPLY AIR
PLENUM
COOLING
COIL
UPFLOW
FURNACE
ELECTRONIC
AIR
CLEANER
RETURN
AIR
PLATFORM
AB8176
Figure 4—Typical Upflow Furnace Installation
TRANSITION TO ACCOMMODATE
| FRONT SECTION OF EAC,
—] RETURN AIR
pr PLENUM
a VENT
RETURN AIR” AT
GRILLE i
4 DOWNFLOW
ELECTRONIC LO FURNACE
AIR CLEANER >
DISCONNECT 7 a
120-V SUPPLY | LLL
LL ib
LLL
COMBUSTIBLE
| — FLOOR BASE
A SUPPLY AIR
+1 | A68178
NN
«- | |->
Figure 6—Typical Downflow Furnace Installation
_3-
3. Because Model 907 cleans only air brought to it by
system blower, run blower continuously, or as much
as possible—summer and winter.
4. Do not block air outlets and returns with draperies
or furniture.
COOLING
COIL
3 TO]
TRANSITION
DUCT WORK
1
* LA
ALTERNATE
AIR CLEANER
POSITION
ELECTRONIC |
> AIR CLEANER
Da UPFLOW FURNACE
A68177
Figure 5—Typical Basement Furnace Installation
ELECTRONIC AIR CLEANER
HORIZONTAL FURNACE
SERVICE PLATFORM ae
— pr
SUPPLY AIR PLENUM
RETURN AIR PLENUM О одбвтте
Figure 7— Typical Horizontal Furnace Installation
12/16/24/907
standing flanges on the air cleaner casing. This per-
mits a greater range of application. If flanges are
needed, “L-shaped standing seam duct cleats can be
| LOCATING THE UNIT
Figures 4, 5, 6, and 7 show the air cleaner in the used for connecting the ductwork, or to position the
return air duct of some typical furnace installations furnace on top of the air cleaner. All downstream
with and without air conditioning. Other methods of connections must be properly sealed to prevent in-
installing the unit are permissible if the design filtration of unfiltered air.
procedure outlined in the Product Data Sheet 1s
observed.
When planning an installation, consider the
following:
Airflow across the air cleaner must be uniform for
best results. Turning vanes should be installed 1f the
1. The air cleaner is approved only for indoor installa- air cleaner is installed close to an elbow. Depending
tion. If an outdoor installation is used, the unit must a.
be housed in a weatherproof enclosure.
9 The air cleaner may be placed on its right or left
side in a vertical or horizontal position. It must be in-
stalled on the inlet air side of the heating and/or
cooling unit. Be sure that the airflow through the air
cleaner is in the same direction as the airflow arrow
indicates.
Figure 8
Power Door Packing
A70013
3. Allow a minimum of 30 inches clearance in front
of the unit for cleaning and maintenance.
4. The air cleaner should never be used to collect
grease or other flammable contaminants.
LINE VOLTAGE
DISCONNECT PREFILTER
5. If a humidifier is used, moisture should be intro-
COLLECTOR
duced downstream from the air cleaner. A
IONIZER
I. CONNECTING THE AIR DUCTS
Dispose of existing mechanical furnace filters. They
are not required. Move ON-OFF switch to OFF and
unlock the power door by rotating the knob (approxi-
mately 10 turns counter-clockwise) until the door 1s
free. Grasp the power door by the knob and the door © ou
handle and remove it from the cleaner casing by BUS BAR‘ o
"T" HANDLES
pulling it towards you. This motion disengages the
120-V power supply connector. POWER DOOR
Remove and discard the cardboard packing taped to AT0008
the inside surface of the door. See Figure 8. Slide out
all three sections. See Figure 9. Note there are no Figure 9—Power Door Removed from Air Cleaner
12/16/24/907 À.
Tf
SL
on the size of the furnace, it may or may not be
necessary to reduce the ductwork on thé leaving air
side of the air cleaner. Whatever the application, a 3
to 1 duct reduction ratio should be maintained (3
inches of duct length for every 1 inch reduction
in size).
NOTE: Do not baffle off any portion of the entering
air side of the cleaner.
When changes in duct size would be too abrupt, an
alternate horizontal position may be used, as |
illustrated in Figure 5.
For best results, use multiple return air grills located
at or near floor level. Higher cleaning efficiencies and
lower blower operating costs are obtained by limiting
the filter face velocity to 350 ft/min.
Ш. MAKING ELECTRICAL CONNECTIONS
1. With power door removed, remove junction box
cover located above female plug on casing center
channel.
2. Air cleaner casing has a top line-voltage entrance
hole. Use hole (install strain relief) to run two-wire
with ground electric cable into position for making
connections at female plug. ,
3. Connect power leads to black and white pigtails
extending from female plug, using wire nuts provided.
4. Connect ground to green pigtail extending from
female plug box, using wire nut provided. Replace
junction box cover.
5. Slide prefilter, ionizer, and collector sections into
casing.
6. Replace power door by first inserting bottom tab
into place on bottom edge of door opening. Push top
of door and guide lock knob screw (Figure 10) into
threads. Turn knob clockwise until screw engages
threads in casing. Continue turning knob clockwise
until door is securely locked.
7. Use proper wiring diagram for single-or multiple-
speed blowers. If cleaner is wired to a multi-speed
direct drive motor, it must be isolated by a relay.
IV. START-UP AND ADJUSTMENT
1. Move switch on power door to ON.
2. Set thermostat to start blower.
TO PRIMARY WINDING
3. Check to see if amber indicator light is glowing.
This indicates proper unit operation.
4. Adjust airflow to no more than 350 ft/min. This
can be done with velometer or as described in filter
flag instruction (optional).
V. MAINTENANCE
Because normal maintenance (cleaning) is so simple,
most homeowners will choose to personally perform
the necessary operations.
Clean the unit where dust from the media pads will
not soil carpets or the floor.
To gain access to the prefilter, ionizer and collector
filter stages, simply push power switch to OFF
position and remove the power door as outlined
previously. Lay it off to one side. Pull out the first-
stage prefilter and vacuum from entering air side, or
wash in detergent and water. Let dry thoroughly. Re-
install. Do not spray prefilter with any filter coatings.
Collector pads should be replaced every 3 months or
~ whenever indicated by the optional filter flag or
monitor panel. This time interval, of course, will vary
with service conditions.
ENCAPSULATED
POWER PACK ON-OFF
- SWITCH
SURGE RESISTOR SUPPLY VOLTAGE :
PLUG
7120. VAC
BASE PLATE LOCK KNOB SCREW
INDICATOR "INDICATOR LIGHT
COVER SOCKET
LIGHT WIRES
A70120
Figure 10—Power Door Internal Detail
12/16/24/907
To replace the media pads:
1. Slide collector section (Figure 11) from unit and
place it, yellow-side down, on a piece of paper (should
be more than twice as large as collector) laid out on a
flat surface. |
2. Deflect spring clips downward, lift wire grill and
pivot it upward enough to remove dirty media pad.
Place soiled pad to one side.
3. Place clean pad on perforated center plate of
collector frame. Pad should completely cover center
plate and insulators.
4. Pivot wire grill downward and deflect spring clips
until grill is engaged.
5. Turn collector section over and repeat steps 2, 3,
and 4 to change other media pad.
NOTE: For best results, do not clean and reuse dirty
media pads. They can, however, be reused tem-
porarily by vacuuming or shaking out accumulated
dust. Pads can be vacuumed through the wire grill.
Use brush attachment of cleaner.
6. Slide collector section on its track completely into
casing. |
7. Roll up dirty pads and paper and dispose of them.
The ionizer assembly should be cleaned at the start of
each heating and cooling season by using the long
brush attachment of a vacuum cleaner; manually by
using a soft, long bristled brush; by wiping the plates
with a damp cloth; or by a combination of these three
methods. Care must be taken not to break the ionizer
wires or bend the ionizer plates. |
After cleaning and reassembly of components, rein-
stall the power door. Make sure that door is securely
locked. Move power switch to ON. Unit is now ready
for operation.
VI. RECOMMENDED SERVICE PROCEDURES
Tools required for servicing:
Jumper cord, l-wire
12/16/24/907
WIRE GRILL
GRILL RETAINER CLIP
FIBER GLASS PAD INSULATORS
"CENTER PLATE
A70119
Figure 11—Collector Section Components
Jumper cord, 3-wire
Voltmeter (capable of measuring up to
10,000 VDC)
Screwdriver, slotted head
Pliers, long nose
1. MALFUNCTIONS THAT PREVENT
INDICATOR LIGHT OPERATION
A glowing indicator light indicates that the power
pack is energized and that the proper DC voltage is
being supplied to the air cleaner. If the light is off,
make the following checks:
A. CHECK PRIMARY VOLTAGE. If the primary
voltage does not read between 108 and 132 VAC at
the outlet receptacle (female plug) on the casing cen-
terpost, check the 120-VAC power source.
If the voltage reading at the centerpost receptacle is
within the 120-VAC+ 10% range, check further to
isolate the problem to:
1. Power door
2. Indicator light
B. CHECK CABINET ASSEMBLY
1. Make sure all components are correctly assembled
as shown in Figure 2.
2. Turn ON-OFF switch to OFF.
3. Remove power door.
4. Install 3-wire jumper cord from male (line voltage
disconnect) plug on power door to female plug on
casing centerpost. See Figure 12.
5. Move ON-OFF switch to ON.
a. If indicator light does not glow, proceed to check
high-voltage output, indicator light, and encapsulated
power pack.
b. If indicator light glows, check out ionizer and
collector sections for possible short. Move switch
OFF; clip jumper between bus-bar (on base plate)
and “T” handle on section testing. Push switch ON. If
indicator light glows when section is energized
separately, section is good. If light does not glow, sec-
tion is shorting out. If either section is defective, refer
to Step 6a and 6b that follow for corrective action
procedures. If both collector and ionizer pass their
checkouts, look for trouble in the power door. Be sure
to push switch OFF and remove jumper cord before
proceeding to check filter sections and power door.
6a. Check out ionizer section for:
(1) Excessive dirt on ionizer wires or ionizer chan-
nels. Clean with vacuum cleaner brush. If necessary,
use cloth dampened in detergent and water solution.
(Dry thoroughly before reassembly).
(2) Bowed or dented ionizer channels. Make sure
channels are approximately parallel. Wires should be
spaced at least 3/8 inch from channels. Straighten
channels if necessary.
(3) Broken or loose ionizer wires. Replace wires
using long-nosed pliers, as shown in Figure 14. Place
terminal on one end of wire in notch in ionizer bus-
bar. Grasp terminal on other end of wire with pliers
and pull wire firmly. Depress ionizer bus-bar with
screwdriver until you can fit wire into notch on bus-
bar; position terminal on bus-bar, then remove
screwdriver pressure on bus-bar.
JUMPER
CORD
A70011
Figure 12—Checking Indicator Light
(4) Broken, cracked, or loose insulator or in-
sulators. Replace complete ionizer section.
(5) Broken spotwelds between ionizer channels
and center ground strap. Refasten strap to channel
with pop rivet or sheet metal screw.
6b. Check out collector section for:
(1) Dirty media pads. Clean or replace. Reassem-
ble collector section. Indicator light should now glow
if dirty pads were problem source.
(2) Bent grills or perforated center plate.
Straighten.
(3) Broken, cracked, or loose insulator or in-
sulators. Replace collector section.
12/16/24/907
C. CHECK HIGH-VOLTAGE OUTPUT. If the ON-
OFF light still will not glow and it has been deter-
mined that the trouble is not in the cabinet assembly,
proceed to check the high-voltage output as follows:
1. Remove base plate from power door.
2. Disconnect surge resistor from terminal on base
plate. See Figure 10. |
3. Install 3-wire jumper cord from male (line voltage
disconnect) plug on casing centerpost. See Figure 12.
4. Push ON-OFF switch ON. If light glows, trouble
is isolated to high-voltage terminal, surge resistor,
broken or damaged bus-bar insulators.
D. CHECK INDICATOR LIGHT. If the indicator
light still does not glow when the high-voltage wire 1s
disconnected from the bus-bar on the base plate,
check the voltage supplied to the light as follows:
1. Disconnect light leads at light.
TOUCH SCREWDRIVER
TO CASING
HOLD BLADE
APPROX. 7 FROM
BUS BAR
A70010
Figure 13—Checking High-Voltage DC Supply
12/16/24/907
2. Energize encapsulated power pack and measure
voltage across light leads. Reading must be 90 to 130
VDC.
3. If voltage is within tolerance, indicator light is
defective. Replace.
E. CHECK ENCAPSULATED POWER PACK. See
Figure 10. If the voltage supplied by the power pack
to the indicator light is less than 60-90 VDC when the
high-voltage wire is disconnected from the bus-bar
and the power pack is energized: | |
1. Power pack has defective circuit.
2. Check terminal on surge resistor for high-voltage
output of power pack. Voltage must read 7500-9000
VDC with surge resistor disconnected from bus-bar.
With air cleaner components energized, operating
voltage is approximately 7200 VDC. If meter is not
available for a voltage measurement, ground blade of
an insulated handle screwdriver against grounded
base plate and move blade tip towards surge resistor
terminal. See Figure 13. A spark should occur at a
gap of 1/8 to 3/16 inch between terminal and
screwdriver tip, indicating potential of approximately
8000 VDC.
3. Encapsulated power pack is defective. Replace.
F. CHECK SURGE RESISTOR. De-energize the
power pack and check the surge resistor in place on
the power pack. See Figure 10. The measurement
should be 15,000 ohms, 30 watts. Replace if shorted
or open. |
A shorted resistor does not properly protect the power
pack. An open resistor means that the high-voltage
cord and air cleaner components are not receiving
high-voltage power.
G. CHECK FOR HIGH- HUMIDITY SHORTING.
During periods of high (over 80 percent) relative
humidity, there exists a possibility that the two nor-
mally nonconductive media pads can absorb enough
moisture to support conduction between the high
positive potential center plate of the collector section
and the two grounded grills. The result is excessive
current draw and the collapse of transformer voltage.
The indicator light goes out. Continuing operation of
the blower in the system should dry out the pads to
stop center plate-to-grill conduction. The high voltage
will be restored and the indicator light will glow
again.
Humidifiers, when used, should be installed down-
stream from the air cleaner to avoid the possibility of
high-humidity shorting.
2. HUMMING NOISE
Check for the following:
A. Improper wiring connections.
B. Loose ionizer wires. Repair or replace.
C. Excessively dirty ionizer or collector section (1n-
cluding media pads). Clean. |
3. CONSTANT OR INTERMITTENT ARCING
Check for:
A. Loose or defective ionizer wire or wires. Repair or
replace.
B. Excessively dirty ionizer or collector section (in-
cluding media pads). Clean.
C. Foreign matter such as string lodged in or close to
ionizer section and flapping in airstream. Remove.
D. Bent ionizer channels. Straighten if possible; if
unable to straighten, replace ionizer section.
E. Broken insulators in. either ionizer or collector
section. Replace ionizer or collector section.
F. Dents in one or both collector section wire grills.
Straighten if possible; if not, replace grill.
G. Improperly positioned media pad. Reposition.
H. Supply voltage exceeding 132 VAC. Change power
pack supply lead to low tap.
I. Vibration from external source. Eliminate
vibration source or isolate air cleaner.
PUSH BUS BAR
FORWARD WITH
SCREWDRIVER
INSULATOR
IONIZER
BUS-BAR
CHANNEL.
FIT WIRE
INTO SLOT
A70012
Figure 14—Replacing lonizer Wire
4. AIR NOT BEING CLEANED
Be sure indicator light is glowing, showing proper
electrical operation. Check for:
A. No power to ionizer and collector sections. Check
for proper contact between bus-bar on power door
and “T” handles on ionizer and collector sections.
B. Airflow through unit set too high. Use velometer
to adjust to no more than 350 ft/min.
C. Leaks in ductwork, blower box, and other parts of
system under negative pressure on clean air side of
air cleaner. Se#l leaks with duct tape or caulking.
D. Dirty air not being delivered to the cleaner as
result of blocked return air grills. Remove drapes,
furniture, or any other obstruction.
E. Uneven air distribution across face of unit. Install
turning vanes or air baffles to even air distribution.
An even collection of dirt across entering side of a
media pad indicates good distribution.
5. RADIO OR TV INTERFERENCE
Check for:
A. Improper grounding. Ascertain that power pack
has good electrical ground.
B. Supply line voltage ground line not properly
grounded. Correct.
- * ! Li
C. Loose ionizer wires. Replace.
D. Foreign particles lodged in ionizer section.
Remove.
E. Loose connections on components or primary
wiring within power door. Tighten connections.
F. Defective power pack. Replace.
G. Dents in one or more grills or center plate.
Straighten or replace.
H. Damaged media pad. Replace.
I. Improperly installed pad. Reposition.
6. WHITE DUST
“White dust” may be noticed on furnishings,
especially when the cleaner first begins to function. It
is especially noticeable on dark furniture. “White
dust” is largely composed of lint, which because of its
weight settles before it reaches the air returns. The
amount of lint generated is increased by new fur-
nishings or draperies and the activity of children and
pets. Large, clean lint particles have no staining or
soiling properties.
SEQUENCE OF OPERATION
When system blower is in operation, power pack (1B)
1s energized with 120-V=10% single phase, 60 Hz AC
current.
12/16/24/907
The enclosed power pack transformer secondary out-
put of approximately 3600 VAC alternately charges
two capacitors through two silicon rectifiers. The
total charge across both capacitors results in a power
LEGEND
1B - Power Pack
4F1 - lonizer
— 4F2 - Collector
11A - Surge Resistor
11D - Earth or Water Ground
11E - Chassis Ground
11F - Indicator Light
L2
4F1
ME
pack output of approximately 7000-7500 VDC.
Current from the enclosed power pack flows through
the surge resistor (11A) and energizes the ionizer sec-
NE
Figure 15—Line-to-Line Wiring Diagram
Li.
AIR
HUMIDIFIER CLEANER
LON-VOLTAGE TERMINAL STRIP (BRYANT) MODEL 850 COMFORT PROGRAMMER
NON--BRYANT - -
* COMMON SIDE OF TRANSFORMER
tion (4F1) and collector section (4F2). 400
El
LOWO
>
HIGH O {1B | |
EQUIPMEN R
| EQ DER
o |
11D
ПЕ
——
A72327
a
LOW HIGH * ©
ELECTRONIC AIR CLEANER HUMIDIFIER
A69400 |
** TERMINAL FOR HEATING SIDE OF THERMOSTAT
*%% TERMINAL FOR COOLING SIDE OF THERMOSTAT
Figure 17—Wiring Diagram of Model 850 Comfort Programmer
12/48/24 1907
Used to Control Model 907
-10-
LOW-VOLTAGE
TO
FURNACE TERMINALS
W X (ON SOME UNITS,
| | X & F MAY BE
| | COMMON) .
FIELD LOW-VOLTAGE | IE |
WIRING — — — | |
FIELD HIGH-VOLTAGE i
24V .
. A RELAY P/N 63653D
< | CURRENT DRAW
SPST 0.1 AMP
MANUAL DISCONNECT
(FIELD INSTALLED) | | !
. В
wor // . |
NEUTRAL _ _. ° AMPERAGE DRAW MUST BE
_— — T° HIGH LOW ADDED TO THE THERMOSTAT
T 0 ANTICIPATOR SETTING
— NOTE: FOR COMBINATION
HEATING/COOLING
INSTALLATIONS HAVING
MULTI-SPEED DIRECT DRIVE
MOTORS, USE THE
ELECTRONIC AIR CLEANER MODEL 850 COMFORT PROGRAMMER.
A70107
Figure 16—Wiring Diagram for Model 907 Connected
to Heating Only Furnace (No Humidifier)
HUMIDIFIER AIR CLEANER
С С
— —— — — — ——— YS. сия ——
— Sr SEE SA AME =—
—
— — —— ml"
i2ov jC
OPTIONAL
AIR
LINE - CLEANER
DELETE THIS
IF HUMIDISTAT
IS USED.
9 Y OOO
COOLING
RELAY
—"— ii .——
COND.
OR
CHILLER
TERM.BLK.
ORG
X TO "W' WIRE FROM THERMOSTAT.
XX TO TRANSFORMER TERMINAL
COMMON WITH GAS VALVE.
6 TOC" WIRE FROM THERMOSTAT
A69320
Figure 18—Wiring Diagram for Comfort System Control Center 120-V
System for Heating and Cooling—Two Transformers.
-11- | 12/16/24/907