Qmark QWD - Washdown Corrosion Resistant Unit Heaters - Manual (Page 4)

4. Heaters are equipped with fan delay control. This control con-
tinues fan operation for a short time after elements are de-
energized to dissipate residual heat.
Optional Equipment
• Built-in Thermostat (bulb and capillary type) for automatic
temperature control. The thermostat controls the heating
elements and fan simultaneously to achieve set temperature.
The Lo setting of the thermostat is approximately 40˚f and
the Hi setting is approximately 90˚f.
• Mode Switch (heater on, heater off, fan only) to permit air
flow with or without energizing the heating elements. The
switch is accessible from outside the NEMA 4X enclosure.
• Pilot Light to indicate when heating elements are energized.
• Internal Fusing
• Manual Reset Limit
• ON/OFF Switch
• for wiring diagram containing options, see label on inside
cover of terminal box.
OPERATING
INSTRUCTIONS
1. Heater must be properly installed before operation.
2. To check out the installation, turn the Mode switch to the
off position. Turn power oN to the heater at the main dis-
connect panel and check to see that the heater is not operat-
ing. if it is operating, disconnect power and check wiring.
3. rotate built-in (or remote mounted) thermostat clockwise to
the highest heat setting. With Heat-Cool switch in off posi-
tion, heater should not operate.
4. Turn Heat-Cool selector switch to the fan only position. The
fan should come on and operate with no heat.
5. Turn Heat-Cool selector switch to the Heat position. The fan
and heater should come on producing heat.
6. The heater should be allowed to operate with the thermostat
at max or high heat until room temperature reaches the
desired level. The thermostat should then be rotated counter-
clockwise until the heater elements turn off (an audible click).
This should set the thermostat to cycle the heater on and off
to maintain the ambient temperature. fine adjustments may
need to be made to obtain the desired room ambient. slight
rotating of the thermostat in the clockwise direction will
increase the room ambient while rotation in the counter-
clockwise direction will lower the room ambient. if remote
thermostat is provided, follow the instructions provided with
thermostat
NOTE: A built in fan delay will cause the fan to run after the ele-
ments turn off to dissipate residual heat.
NOTE: if a Disconnect switch option is provided, this switch will
be accessible from the outside of the control box and will be
marked oN and off accordingly. in the off position, the
heater will not operate.
NOTE: if a Manual-reset Cutout option is provided, the rEsET
button will be marked and accessible on the control panel. This
safety control will operate only if the heater overheats.
MAINTENANCE
INSTRUCTIONS
it is important to keep this heater clean. your heater will give you
years of service and comfort with only minimum care. To assure
efficient operation follow the simple instructions below.
User Cleaning Instructions:
1. Turn off power to heater and allow elements to cool.
2. Vacuum or hose off heater with water (at city pressure)
before activating for next heating season to remove accumu-
lated dust or lint which otherwise may smoke or incinerate on
initial heat up.
3. return power to heater and check to make sure it is operat-
ing properly.
Maintenance Cleaning Instructions:
(To be performed only by Qualified Service Personnel)
At least annually, the heater should be cleaned and serviced by
a qualified service person to assure safe and efficient operation.
This should include as necessary, vacuuming dust and debris
from the elements and fan, and check all screw lug connections
for tightness to a recommended minimum torque of 35 in-lbs.
(3.9 N-m) using the included tool(s) for hard to reach lugs if nec-
essary. After completing the cleaning and servicing, the heater
should be fully reassembled and checked for proper operation.
IMPORTANT NOTE: for heaters used in a hose down applica-
tion, it is recommended that periodically after the heater has
been hosed down (with power off at panel) the wiring enclosure
cover be opened and the interior inspected for water penetration.
if water is discovered, the heater must be repaired by a qualified
electrician to assure the seals are properly installed.
During each cleaning, all seals should be inspected for damage
as it is critical that they maintain a water tight seal. if damage is
discovered (such as tears or cracking), they should be replaced
or repaired with an appropriate silicone sealant.
Do NoT TAMPEr WiTH or ByPAss ANy sAfETy LiMiTs
iNsiDE HEATEr. fAN BLADE roTATioN MusT BE CHECKED. if AirfLoW is
NoT MoViNg ouT THrougH THE ouTLET griLLE,
iNTErCHANgE ANy TWo of THE THrEE iNCoMiNg
suPPLy PoWEr LEADs oN THrEE-PHAsE uNiTs oNLy.
ALL sErViCiNg BEyoND siMPLE CLEANiNg THAT
rEquirEs DisAssEMBLy sHouLD BE PErforMED By
quALifiED sErViCE PErsoNNEL.
To rEDuCE risK of firE AND ELECTriC sHoCK or
iNJury, DisCoNNECT ALL PoWEr CoMiNg To HEATEr
AT MAiN sErViCE PANEL AND CHECK THAT THE ELEMENT
is CooL BEforE sErViCiNg or PErforMiNg
MAiNTENANCE.
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