Chromalox CAF-12, CCAS-12 Draft Barrier Heater Installation Wall, Service Supply Wiring Sizes

GENERAL

Draft Barrier Heater Installation (Wall)

1.Once the correct mounting height is established, scribe or snap a level line on the wall to maintain each heater back plate in horizontal alignment, when mounting.

2.Remove heater front cover by lifting top rear edge to unsnap cover from back plate (store cover in safe location to avoid damage to the finish). (See Figure 2.)

3.Remove all appropriate knockouts from terminal boxes, partic- ularly terminal box end knockouts when installing continuous run heating. (See Figure 3.)

4.Mount the back panel to the wall using suitable fasteners (not supplied). Should the wall surface be uneven, secure the heater backplate to the high spots only to avoid a distorted appearance.

Draft Barrier Heater Installation (Floor)

1.	Unpack the heater and pedestal(s) from the carton (The
	pedestals are packed at the end of carton) and lift the front/top
2.	panels up and off the heater.
	Disassemble the pedestal base from the pedestal pad.

Figure 2

3.	Remove the desired terminal box cover(s) and supply wire
4.	entry knockouts from the terminal boxes.
	Secure a pedestal to each end of the heater bottom with #8
	screws provided aligning the back and front edges of the pad
	with the heater. This will align the supply entry knockout with
	opening in pedestal pad.
	TIP: Units longer than 4 feet will be provided with 3 or more
	pedestals. The extra pedestals should be used to support the
5.	middle of heaters.
	Place heater on the pedestal base(s) and tighten all screws.

1-1/2

2

Length

Back View

		CAF-12
	12	Side View
		(Less End Cap)
1	1
	5-3/4

TIP: The height of the heater can be adjusted on the pedestal to

aid in leveling the heater by loosening the securing bolt at the

side of the pedestals.

6. Remove the terminal box cover and proceed to wiring instructions.

Terminal Box
Terminal Box			CCAS-12
2-3/4		12
			Side View
			(Less End Cap)
Bottom View	1	1
(Front Inlet Version Shown)
	5-3/4

Figure 3

WIRING

Ground Continuity —

Note: All wiring should be done in accordance with local codes and the National Electrical Code by a qualified person.

WARNING: Hazard of Electric Shock. Any installa- tion involving electric heaters must be effectively grounded in accordance with the National Electrical Code to eliminate shock hazard.

Prior To Installation —

WARNING: Hazard of Electric Shock. Disconnect all power before installing heater.

1.All branch circuit and service supply wiring must be complet- ed to the heater terminal box location.

2.Check heater nameplate ratings to be sure heater voltage is same as service supply.

3.Service supply entry is usually made to one heater terminal box (see Figure 3) with through wiring (Factory Installed) being used for interconnection of all heaters in a continuous run installation.

Note: When heaters are mounted end to end, remove the finishing end plate, install a chase nipple and locknut in the terminal box end knockout to ensure grounding continuity and to protect the wiring.

Where heaters are spaced apart, remove the finishing end plate, and use rigid conduit (Provided by customer) for through wiring and ground continuity. Do not exceed the allowable number of conductors allowed by the National Electrical Code.

Note: See Table 3 for recommended service supply wire sizes.

Figure 4

4.Knockouts are provided at the back, bottom and ends of all heater backs (see Figure 3). Terminal boxes are located at both ends of every heater.

Table 3: Service Supply Wiring Sizes

Recommended minimum supply wire sizes are listed in the table below:

Maximum Watts Per Circuit Using 75 Degree C. Wire

	Rough In
	Wire Size	120V	208V	240V	277V	347V	480V	600V
	14	1440	2496	2880	3324	4164	5760	7200
Copper	12	1920	3328	3840	4432	5552	7680	9600
Wire	10	2880	4992	5760	6648	8328	11520	14400