Bryant 905D User Manual

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.

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