Caution – Qmark QCH - Ceiling Mounted Fan-Forced Heaters User Manual

Page 3

INSTALLATION AND WIRING OF HEATER / FAN ASSEMBLY

1. Following wiring diagram (Figure 3) connect supply wiring and thermo-

stat wiring to heater lead wires in back box.

NOTE: For 120 and 277 volt heaters connect the white neutral sup-

plylead to the heaters white pigtail lead, and connect the black supply

lead to the heaters black pigtail lead. For 208 and 240 volt heaters

change the color of the heaters white pigtail lead to black by wrapping

with black electrical tape. (Most electrical codes require the supply

leads to be conneced to black leads). Then connect the two black

supply leads to the two black receptacle leads. Connect the two red

thermostat leads to thermostat as shown in wiring diagram.

2. Insert wiring plug from heater/fan assembly into socket in back box.
3. Fit heater/fan assembly into back box and secure in place with (2)

screws provided through the center slots in the fan assembly.
NOTE: Use the screws provided by the factory to install heater/fan as-

sembly to the back box.

4. Turn disconnect switch mounted on heater/fan assembly “ON”.

INSTALLATION OF FRONT COVER (GRILLE)

1. The three grille parts are shipped assembled. Remove the top and

bottom plastic pieces from the front cover. A flat blade screwdriver can

be used to gently separate the front cover from the plastic pieces.

2. Attach the top and bottom plastic pieces to the heat deck using the

four (4) screws provided in the parts bag.

3. Position the front cover so the four (4) holes on the side align with the

tabs on the plastic pieces mounted on the heat deck.

4. Hook the front cover over the tabs on one side then rotate the front

cover into place making sure that all four tabs are snapped onto the

front cover.

HEATER CHECKOUT AND OPERATION

1. After heater is completely assembled, rotate wall thermostat knob

counterclockwise until control stops. This is the minimum heat setting.

2. Turn power supply to heater “ON” at main switch panel.
3. Heater should not operate. If it operates, disconnect power and re-

check wiring.

4. Rotate wall thermostat knob clockwise until it stops (maximum heat

setting) and wait at least 2 minutes. Fan control will delay fan coming

on until element is warm.

5. If heater and fan do not come on, disconnect power and check wiring.
6. Allow heater to continue to operate until room temperature reaches

desired comfort level. Then rotate wall thermostat knob counterclock-

wise slowly until thermostat clicks off. Fan must continue to operate

for a minute or so until element cools. If fan turns off immediately

when thermostat is turned off, disconnect power and check wiring.

(See Fan Delay Notice).

7. It may be necessary to readjust thermostat a time or so until exact

comfort level is attained. Rotation in the clockwise direction will in-

crease the amount of time the heater will produce heat. Rotation in

the counterclockwise direction will reduce the amount of time the

heater is on.

NOTE: For best results, the heater should be left “ON” constantly during

the heating season as the thermostat, when properly set, will maintain the

desired temperature. In the full counter-clockwise position the heater will

remain off until the room temperature drops well below freezing.

MAINTENANCE AND CLEANING

Your heater is designed for years of trouble-free operation and requires

no special maintenance other than occasional cleaning. The motor is

permanently lubricated.
Once each year, the heater should be cleaned to remove dust and other

foreign material which has collected during the heating season, as

follows:

1. Turn power off at main switch.
2. Remove front cover by depressing plastic tabs with a flat bladed screw-

driver as shown in Figure 4. Release both tabs on one side then rotate

cover off of heater fan assembly.

3. Use vacuum cleaner with brush attachment to remove dust and dirt that

has accumulated in heater (especially around element and fan blade).

Do not use water or any cleaners to clean heater components.

4. Replace grille.
5. Wipe grille clean with a damp cloth. DO NOT use waxes or any cleaners

that leave a residue since these may discolor during heater operation.

6. Turn the main line switch on at the switch panel to restore power to

heater. The heater is now ready for another season of operation.

OPERATIONAL NOTICE

Your heater is equipped with an automatic reset over-temperature limit con-

trol that will automatically turn the heater off to prevent a fire if the heater

overheats.

Disconnect
Switch
Assembly

Over-
Temperature
Limit

Fan Delay Control

Elements

Fan Motor

Red Jumper
(Remove for half wattage)

Tstat leads (Red)

Power leads
(Black & White)

Figure 3 - Wiring Diagram

Figure 4

FIELD WIRING

FACTORY WIRING

TO REDUCE RISK OF FIRE OR PERMANENT DAMAGE TO HEATER,

THERMOSTAT MUST NOT CUT POWER TO FAN. THERMOSTAT MUST

BE WIRED AS SHOWN IN WIRING DIAGRAM SO THAT IT CYCLES

HEATING ELEMENTS ONLY.

CAUTION

Figure 2

Remove red

jumper for

lower wattage

rating

BE SURE ALL WIRING IS SECURELY ROUTED AWAY FROM FAN

AND ELEMENT.

CAUTION