Reznor CAUA User manual

Revision: CAUA-CW4-CW16 (04-22) 166162-A

RETURN AIR FILTER CABINET INSTALLATION FOR GAS-FIRED

INDOOR HEATER

Supersedes: I-CAUA-FC (04-15) PN166162R2

OPTION CW4, CW5, CW6, CW7, CW8, CW9, CW10, CW11, CW12, CW13, CW14, CW15,

OR CW16 FOR MODEL CAUA

Table 1. Return Air Filter Cabinet Filter Applicability

Where Assembled Option 2-Inch Filter Type Unit Size

Field

CW4 Pleated

All

CW5 Permanent

CW6 Pleated or permanent*

CW7 Pleated

CW8 Pleated

150, 200

CW9 Permanent

CW10 Pleated or permanent*

CW11 Pleated or permanent *

All

CW12 Permanent

Factory

CW13 Disposable

CW14 Pleated

CW15 Permanent

CW16 Pleated or permanent*

*Field-supplied.

GENERAL INFORMATION

•These instructions are for installing an optional return air ﬁlter cabinet on a model CAUA heater.

•Refer to the installation manual provided with the heater for important safety information.

Filters

TABLE OF CONTENTS

GENERAL INFORMATION ................................................................... 1

Filters................................................................................... 1

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

COMPONENTS ............................................................................ 4

INSTALLATION ............................................................................ 6

Cut Inlet Air Opening and Drill Mounting Holes................................................... 6

Cut Inlet Air Opening and Drill Mounting Holes—Continued......................................... 8

Installation of Return Air Filter Cabinet on Side (Option CW4, CW5, or CW6)

or Rear (Option CW7, CW11, or CW12) of Heater ................................................ 8

Install Filter Cabinet with Horizontal (Rear) Inlet ............................................... 9

Install Filter Cabinet with Vertical (Top) Inlet .................................................11

Installation of Return Air Filter Cabinet on Rear or Side of Heater

(Option CW8, CW9, or CW10, Unit Size 150 or 200 Rear Inlet Only).................................12

Installation of Bottom Return Air Filter Cabinet (Option CW13, CW14, CW15, or CW16) .................14

Heater Startup...........................................................................15

2CAUA-CW4-CW16 (04-22) 166162-A

Table 2. Return Air Filter Cabinet CFM Applicability

Option

Unit Size

Option150 200 250, 300 350, 400

CFM Available

CW4

1800, 2400, 3000 2400, 3000

3000, 5000*4300, 5000 CW4

CW5 3000, 4000, 5000*4300, 5000, 6000 CW5

CW6 CW6

CW7 3000, 4000, 5000 4300, 5000 CW7

CW8 1800, 2400 2400

— —

CW8

CW9

1800, 2400, 3000 2400, 3000

CW9

CW10 CW10

CW11

3000, 4000, 5000 4300, 5000, 6000

CW11

CW12 CW12

CW13 CW13

CW14 CW14

CW15 CW15

CW16 CW16

*For 5,000 CFM on unit sizes 250 and 300, install either a cabinet on the rear of the heater or two side cabinets—one on each side.

Dimensions

GENERAL INFORMATION—CONTINUED

Filters—Continued

Figure 1. Rear Inlet Cabinet Dimensions (Refer to Table 3)

OPTIONS CW4,

CW5, CW6, CW7,

CW11, AND

CW12

OPTIONS CW8,

CW9, AND CW10

CAUA-CW4-CW16 (04-22) 166162-A

Table 3. Rear Inlet Cabinet Dimensions

Unit Size CW Option

Dimension*

A B C D

Inches (mm)

150, 200 4, 5, 6, 7, 11, 12 34-11/16 (881) 32 (813) 34-3/4 (883) 18 (457)

8, 9, 10 21-5/32 (537) 12-1/2 (318)

250, 300 4, 5, 6 34-11/16 (881) 32 (813)

34-3/4 (883) 18 (457)7, 11, 12 47-13/16 (1214) 45-1/8 (1143)

350, 400 4, 5, 6, 7, 11, 12 47-13/16 (1214) 45-1/8 (1143)

*See Figure 1.

Figure 2. Top Inlet Cabinet Dimensions (Refer to Table 4)

Table 4. Top Inlet Cabinet Dimensions

Unit Size CW Option

Dimension*

A B

Inches (mm)

150, 200 4, 5, 6, 7, 11, 12 34-11/16 (881) 32 (813)

250, 300 4, 5, 6 34-11/16 (881) 32 (813)

7, 11, 12 47-13/16 (1214) 45-1/8 (1143)

350, 400 4, 5, 6, 7, 11, 12 47-13/16 (1214) 45-1/8 (1143)

*See Figure 2.

Figure 3. Bottom Inlet Cabinet Dimensions

OPTIONS CW4, CW5,

CW6, CW7, CW11,

AND CW12

OPTIONS CW13, CW14, CW15, AND CW16

4CAUA-CW4-CW16 (04-22) 166162-A

COMPONENTS

Ensure that all components listed in Table 5, Table 6, Table 7, or Table 8 are available before beginning installation.

Table 5. Option CW4, CW5, and CW6 Components

Component Description

Unit Size

150, 200, 250, 300 350, 400

Option

CW4 CW5 CW6 CW4 CW5 CW6

Kit PN

166153 166154 166155 166156 166157 166158

Component PN (Quantity)*

Panel

Bottom 160925 160926

Side 160634 160634

Rear or top inlet, with duct ﬂange 160927 164520

Top or bottom rear 160630 160631

Top rear 160632 160633

Door Assembly, with handle and latch 165033 165033

Channel Door 160635 (2) 160635 (2)

Support Filter 160636 (2) 165018 (2)

Filter, vertical inlet only 164524 (2) 164525 (2)

Channel Filter support 160923 (2) 160924 (2)

Channel assembly Filter 165035 165036

Screw Sheet metal, #10-32 ×1/2 113275 (54) 113275 (54)

Brace Corner 166151 (2) 166151 (2)

Filter** Pleated, 2 ×16 ×16 104109 (4) — 104109 (6) —

Permanent, 2 ×12 ×16 — 104103 (4) — — 104103 (6) —

*Quantity is one (1) unless otherwise indicated.

**Filters for option CW6 are ﬁeld-supplied 2-inch ﬁlters.

Table 6. Option CW7, CW11, and CW12 Components

Component Description

Unit Size

150, 200 250, 300, 350, 400

Option

CW7 CW11 CW12 CW7 CW11 CW12

Kit PN

166153 166155 166154 166156 166158 166157

Component PN (Quantity)*

Panel

Bottom 160925 160926

Side 160634 160634

Rear or top inlet, with duct ﬂange 160927 164520

Top or bottom rear 160630 160631

Top rear 160632 160633

Door Assembly, with handle and latch 165033 165033

Channel Door 160635 (2) 160635 (2)

Support Filter 160636 (2) 165018 (2)

Filter, vertical inlet only 164524 (2) 164525 (2)

Channel Filter support 160923 (2) 160924 (2)

Channel assembly Filter 165035 165036

Screw Sheet metal, #10-32 ×1/2 113275 (54) 113275 (54)

Brace Corner 166151 (2) 166151 (2)

Filter** Pleated, 2 ×16 ×16 104109 (4) — 104109 (6) —

Permanent, 2 ×12 ×16 — 104103 (4) — 104103 (6)

*Quantity is one (1) unless otherwise indicated.

**Filters for option CW11 are ﬁeld-supplied 2-inch ﬁlters.

CAUA-CW4-CW16 (04-22) 166162-A

Table 7. Option CW8, CW9, and CW10 Components

Component Description

Unit Size

150, 200

Option

CW8 CW9 CW10

Kit PN

166159 166160 166161

Component PN (Quantity)*

Panel

Top 164537

Side 164536

Rear inlet, with duct ﬂange 164533

Bottom 164537

Door Assembly, with handle and latch 166148

Channel Door 164535

Support Filter 164704 (2)

Channel Filter support 164532 (2)

Channel assembly Filter 166147

Screw Sheet metal, #10-32 ×1/2 113275 (20)

Filter** Pleated, 2 ×12 ×32 114324 (2) —

Permanent, 2 ×12 ×16 — 114325 (4) —

*Quantity is one (1) unless otherwise indicated.

**Filters for option CW10 are ﬁeld-supplied 2-inch ﬁlters.

Table 8. Option CW13, CW14, CW15, and CW16 Components

Component Description

Unit Size

150, 200 250, 300 350, 400

Option

CW13 CW14 CW15 CW16 CW13 CW14 CW15 CW16 CW13 CW14 CW15 CW16

Kit PN

195165 195154 195157 195160 195166 195155 195158 195161 195167 195156 195159 195162

Component PN (Quantity)*

Panel Side 194686 (2) 194675 (2) 194675 (2)

Rear 194677 194662 194662

Door cover Top 194686 194672 (2) 194672 (2)

Door Assembly 194938 194939 (2) 194939 (2)

Filter**

Disposable,

2 ×16 ×16

104101

(6) —104101

(8) —104101

(12) —

Pleated disposable,

2 ×16 ×16 —104109

(6) — — 104109

(8) — — 104109

(12) —

Permanent aluminum,

2 ×16 ×16 —104103

(6) — — 104103

(8) — — 104103

(12) —

Filter rack Assembly, single 194916 (2) 194916 (4) 194917 (4)

Assembly, double 194914 (2) 194914 (2) 194915 (2)

Blockoff Filter 195164 (3) 195164 (4) 195164 (4)

*Quantity is one (1) unless otherwise indicated.

**Filters for option CW16 are ﬁeld-supplied 2-inch ﬁlters.

6CAUA-CW4-CW16 (04-22) 166162-A

INSTALLATION

NOTE: Not all screw holes will be used.

Cut Inlet Air Opening and Drill Mounting Holes

1. If heater is installed, turn OFF gas and electric power and disconnect any return air ductwork.

⚠ WARNING ⚠

Cut edges of metal cabinets are sharp.

2. Locate four embosses (see Figure 4) in metal panel where ﬁlter cabinet is to connect to heater. Embosses are

corner indicators for inlet air opening.

Figure 4. Embosses

CW4, CW5, CW6 CW7, CW11, CW12

CW8, CW9, CW10 (REAR)CW8, CW9, CW10 (SIDE)

CW13, CW14, CW15, CW16 (BOTTOM)

150/200: 19" (483mm)

250/300: 16" (406mm)

350/400: 32" (813mm)

150/200: 34" (864mm)

250/300: 46" (1168mm)

350/400: 46" (1168mm)

CAUA-CW4-CW16 (04-22) 166162-A

⚠ DANGER ⚠

When cutting the inlet air opening for options CW13,CW14,CW15, and CW16,bottom ﬁlter cabinets,

provide adequate support for the unit.

NOTE: When cutting the opening in the bottom of the unit, the unit will have to be tipped. Provide

adequate support for the unit during this process. If the installation includes an optional cooling

coil and/or a discharge plenum, cut inlet air opening before adding these accessories.

3. Carefully cut straight lines between embosses to create inlet opening using tin snips or aviation shears.

NOTE: Mounting hole dimensions for options CW8, CW9, and CW10 are different for the door and

heater ends of the ﬁlter cabinet. Mounting holes are not required for options CW13, CW14, CW15,

and CW16, bottom ﬁlter cabinets with bottom duct openings.

4. For option CW4, CW5, CW6, CW7, CW8, CW9, CW10, CW11, or CW12, mark and drill four 1/8-inch holes above

inlet opening as shown in Figure 5.

Figure 5. Mounting Holes and Dimensions (Refer to Table 9)

CW4, CW5, CW6 CW7, CW11, CW12

CW8, CW9, CW10

8CAUA-CW4-CW16 (04-22) 166162-A

Table 9. Inlet Air Opening Dimensions

Option Dimension*

Unit Size

150, 200 250, 300 350, 400

Inches (mm)

CW4, CW5, CW6 A 8 (203) 9 (229)

E (number of holes) 5 6

CW7, CW11, CW12

B 2-15/32 (63) 1-29/32 (48)

C 3 (76) 2-1/2 (64)

D 8 (203) 9 (229)

E (number of holes) 5 6

CW8, CW9, CW10

F (door end) Side panel: 1-13/16 (46)

—

Rear panel: 2-15/32 (63)

G (heater end) Side panel: 1-11/32 (34)

Rear panel: 2 (51)

CW13, CW14, CW15, CW16

A 34 (864) 46 (1168) 46 (1168)

B 4-5/8 (117) 4-3/4 (121) 4-7/8 (124)

C 19 (483) 16 (406) 32 (813)

*See Figure 5.

Installation of Return Air Filter Cabinet on Side (Option CW4, CW5, or CW6) or Rear (Option

CW7, CW11, or CW12) of Heater

NOTE: Options CW4, CW5, CW6, CW7, CW11, and CW12 are shipped separately for ﬁeld-assembly

and installation. The cabinets are assembled as they are installed.

See possible conﬁgurations shown in Figure 6 and Figure 7. Return air ﬁlter cabinet is shaded gray. Refer to Table

5or Table 6 for option package components.

INSTALLATION—CONTINUED

Cut Inlet Air Opening and Drill Mounting Holes—Continued

Figure 6. Option CW4, CW5, and CW6 Conﬁgurations

Figure 7. Option CW7, CW11, and CW12 Conﬁguration

INSTALLATION ON EITHER SIDE

(ALL UNIT SIZES)

INSTALLATION ON BOTH SIDES

(UNIT SIZES 250 AND 300)

INSTALLATION ON REAR (ALL UNIT SIZES)

CAUA-CW4-CW16 (04-22) 166162-A

Install Filter Cabinet with Horizontal (Rear) Inlet

1. Assemble two ﬁlter support assemblies using two ﬁlter supports, two ﬁlter support channels, and sheet metal

screws as shown in Figure 8.

Figure 8. Assemble Filter Supports

2. Install two door channels, two ﬁlter support assemblies, and bottom panel as shown in Figure 9:

a. Install door channels as shown and secure using sheet metal screws.

b. Remove existing screws from along bottom edge of heater cabinet. Position bottom panel against heater cabinet

and ﬁrst ﬁlter support assembly on top of bottom panel (channel up) as shown and secure bottom panel and

ﬁlter support assembly using existing screws.

c. Remove existing screws above cutout area, position second ﬁlter support assembly over holes (channel down)

as shown, and secure ﬁlter support assembly to heater cabinet using existing screws.

FILTER SUPPORT

FILTER SUPPORT CHANNEL

SHEET METAL SCREW

Figure 9. Install Bottom Panel and Filter Support Assemblies

NOTE: Install a side panel on one end of the ﬁlter cabinet and a door assembly on the other end

of the ﬁlter cabinet.

3. Install side panel, rear inlet panel, and ﬁlter channel assembly as shown in Figure 10:

a. Secure side panel to door channel installed in step 2a using sheet metal screws. Secure rear inlet panel to

side panel and to bottom panel installed in step 2b using sheet metal screws.

b. Secure ﬁlter channel assembly to rear inlet panel using sheet metal screws.

DOOR CHANNEL

SHEET METAL SCREWS

FILTER

SUPPORT

ASSEMBLY BOTTOM PANEL

EXISTING SCREWS

DOOR CHANNEL

EXISTING SCREWS

10 CAUA-CW4-CW16 (04-22) 166162-A

INSTALLATION—CONTINUED

Installation of Return Air Filter Cabinet on Side (Option CW4, CW5, or CW6) or Rear (Option

CW7, CW11, or CW12) of Heater—Continued

Install Filter Cabinet with Horizontal (Rear) Inlet—Continued

Figure 10. Install Side and Rear Inlet Panels and Filter Channel Assembly

4. Install rear top panel, top panel, and corner braces and secure ﬁlter cabinet to heater cabinet as shown in Figure 11:

a. Secure rear top panel to side panel and rear inlet panel installed in step 3a using sheet metal screws. Secure

top panel to rear inlet panel and to heater cabinet using sheet metal screws.

b. For structural support, install corner braces—one in bottom outer corner on door end of ﬁlter cabinet and one

in top outer corner. Secure braces using sheet metal screw.

SIDE PANEL

REAR INLET PANEL

FILTER CHANNEL ASSEMBLY

SHEET METAL SCREW

SHEET METAL SCREWS

Figure 11. Install Horizontal Inlet Filter Cabinet on Heater

5. Slide ﬁlters into ﬁlter rack channels.

6. Install door assembly on open end of ﬁlter cabinet and secure using sheet metal screws. Fasten door latches.

7. Connect ductwork (refer to Dimensions section for duct ﬂange dimensions).

CORNER

BRACES

SHEET METAL

SCREWS

SHEET METAL SCREWS

TOP PANEL

REAR

TOP

PANEL

SHEET METAL SCREWS

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