905D
Installation Instructions
POWER HUMIDIFIER
INTRODUCTION
The Bryant Model 905D Duct Humidifier is shipped
complete and ready for mounting to the supply air
duct of the heating unit. The humidifier is connected
electrically to the heating unit blower circuit and
operates only when the blower is running on heating
cycles. The water supply connects to the float-valve
assembly, mounted in the upper front corner of the
humidifier pan. The waterflow is automatically con
trolled by the float.
We recommend the use of a humidistat with the
Model 905D because of its high humidification
capacity.
The Bryant Humidifier includes the following:
Disc assembly
Drive motor
Water pan
Water valve and float assembly
Sight window
Drain plug
Paper template
Parts bag containing: power supply cord, latches,
mounting bracket, and saddle valve assembly.
IMPORTANT: Read before installing.
1. Check local codes and ordinances for
requirements.
2. Check power supply to be sure it corresponds to
that specified on the rating plate (115-60-1).
Installation of the Model 905D Humidifier comprises
the following steps (sections):
I. Locating the Unit
II. Mounting the Unit
III. Connecting Water Supply
IV. Connecting Electrical Supply
V. Start-up and Adjustment
VI. Service and Maintenance
I. LOCATING THE UNIT
The unit should be located on a supply air duct
having a minimum width of 12 inches. For best
operation, locate unit where air is evenly distributed
in the duct. The duct should be level, within 1/4 inch
per foot at the point of installation.
NOTE: The minimum size duct on which the
humidifier can be mounted is 8 inches high by 12
inches wide. Bryant’s Model 905D Humidifier is
designed for indoor installation only.
Series D
bri|ant
Cancels: 39905D1 Rev 4 | 39905D4
4/15/73
I
Figure 1—Model 905D Power Humidifier
II. MOUNTING THE UNIT
,1. Tape paper template to duct at desired location;
proceed to cut opening and drill holes per in
structions printed on template.
2. Install mounting bracket and latches. See
Figinre 3.
3. Slide humidifier pan rim, one without foam tape,
into mounting bracket. Lift unit into place and
turn latches so they catch rim of humidifier.
4. Check for air leaks. Use stiffeners around duct
opening to straighten duct if necessary.
III. CONNECTING WATER SUPPLY
NOTE: Unsoftened water is recommended.
1. Tap off nearest cold water line with self-piercing
saddle valve provided. Follow directions on
packet for installing saddle valve.
2. For connecting main water supply to humidifier
pan, use Bryant’s optional tubing kit P/N
65193D01 (instruction included in kit). In a few
cases, because of local codes, it may be necessary
to use 1/4-inch copper tubing rather than plastic
tube supplied in Bryant tubing kit. Tubing line
should be purged with water before connecting to
float-valve assembly.
3. A drain line can be connected to 1/2-inch OD
outlet located in right-hand corner of humidifier
pan when facing humidifier motor. Run line to
an open drain.
Table I—Ratings and Performance
MODEL
Electrical
Voltage-Freq-Phase 115-60-1
Performance & Physical Data
Evaporative Rate*
Plenum Cutout Dimensions
Water Supply Line
Overflow Drain Connection
5.2 Ibs/hr
10-7/8 X 12
1/4-in. tube
*Rated in accordance with A.R.I. Standard 610-70.
905D
1/2-in.
IV. ELECTRICAL CONNECTIONS
Make all electrical connections in accordance with
National Electric Code and any local codes or or
dinances that may apply.
If aluminum conductors are used, the wire size selec
ted must have a current carrying capacity not less
than that of the copper wire specified and must not
create a voltage drop between the service panel and
the unit in excess of 2% of the unit rated voltage. As a
minimum, aluminum wire must be treated to prevent
oxidation, with electric power turned off. Recheck all
electrical connections (both factory and field) for
tightness. Be sure to check power supply connections,
especially if aluminum conductors are used.
Wire the service cord furnished in the parts bag in
parallel with the heating unit fan motor as shown in
the appropriate diagram. See Figures 4, 5, 6, or 7.
-2-
V. START-UP AND ADJUSTMENT
1. Open saddle valve to permit water to flpw into
humidifier pan. Make sure all connections are
tight and there are no water leaks. Check drain
plug; if necessary, tighten plug by turning handle
clockwise.
2. Allow humidifier pan to fill. As water approaches
top of overflow tube, make sure float-valve
closes, stopping water flow 1/2 to 3/4 inch below
top of overflow.
3. Plug humidifier motor cord into service cord.
4. Start heating unit. When heating unit blower
starts, look through sight glass to see if disc
assembly is rotating. If humidistat is used, circuit
must be made through it.
5. Stop heating unit. When blower stops, look
through sight glass to be sure disc assembly stops.
6. If installation includes cooling, start cooling unit.
When blower motor of heating unit starts, look
through sight glass to be sure disc assembly is
NOT rotating.
7. Leave these instructions with homeowner.
VI. MAINTENANCE
Each spring I the humidifier pan should be removed
and cleaned/.
1. Disconnect humidifier service cord.
2. Turn off water supply to humidifier.
3. Hold bucket under humidifier pan; remove drain
plug and empty water from humidifier into
bucket (approximately 2 gallons).
4. Disconnect water supply line from humidifier.
5. Turn latches 1/4 turn and remove humidifier.
6. Remove disc assembly by lifting end of shaft op
posite motor and pulling away from motor at
same time. Replace disc assembly when, space
between discs is less than 1/4 inch, and solids
cannot be easily removed. (When discs are
plugged, airflow is not necessarily reduced—only
when the space between the discs is clogged
enough to restrict airflow.)
7. Clean humidifier pan before reassembling.
8. Reverse procedure outlined in Steps 1-6 for
reassembling. However, if installation includes
cooling, do not turn on water supply to
humidifier (Step 2) until start of heating season.
NOTE: During the heating season, humidifier pan
should be drained and flushed once a month.
.-.T.T-_. ... *.
Figure 3—Installing Humidifier
-3-
115V
TO FURNACE
TRANSFORMER
HUMIDIFIER WIRING FOR SINGLE SPEED
HEAT-COOL INSTALLATION.
115V
POWER
SUPPLY
Figure 4—Heating Only 115-Volt
Single-Speed Motor
A67120
Figure 5—Heating and Cooiing
115-Volt Single-Speed Motor
FURNACE TERMINAL BLOCK
*ADD AMP DRAW OF RELAY TO THE THERMOSTAT SETTING
FURNACE TERMINAL BLOCK
Figure 6—Heating and Cooling
115-Volt Multi-Speed Motor
Figure 7—Wiring for 230-Volt
Installation
*ADD AMP DRAW OF RELAY TO THE THERMOSTAT SETTING
.4.
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