Reflect-O-Ray
®
EDS-4DI & EHS-4DI
Installation, Operation & Service
Page 36
Combustion Research Corporation
SEQUENCE OF OPERATION
1. Thermostat calls for heat.
2. Vacuum exhauster is energized.
3. Differential airflow switch proves that operation of the
exhauster and the ignition control is energized.
4. After pre-purge timing, the spark igniter and gas valve
are energized.
5. The ignition control senses the flame (flame
rectification) and turns off the spark ignition.
6. After the thermostat is satisfied the power is removed
from the burner assembly causing the ignition control,
gas valve and vacuum exhauster to be de-energized.
6. System waits for the next call for heat.
OPERATION
Before connecting the system to the electric supply, check
the electrical characteristics as indicated on the Rating /
Nameplate to insure proper voltage and gas supply.
With the system completely assembled, all ducts attached
and in full operation, measure current input to the motor
and compare with the nameplate rating to determine if the
motor is operating at safe load conditions and not
overloaded.
GENERAL SAFETY INFORMATION
1. Follow all local electrical and safety codes, as well as
the National Electrical Code (NEC) and the
Occupational Safety and Health Act (OSHA).
2. Burner(s) and vacuum exhauster must be securely and
adequately grounded. This can be accomplished by
wiring with a grounded, metal-clad raceway system, by
using a separate ground wire connected to the bare
metal of vacuum exhauster frame, or other suitable
means;
3. Always disconnect power source before working on or
near a motor or its connected load. If the power
disconnect point is out-of-sight, lock it in the open
position and tag to prevent unexpected application of
power.
4. Care must be taken when touching the exterior of an
operating motor. It may be hot enough to be painful or
cause burn injury. With modern motors, this condition
is normal when operating at rated load and voltages.
These motors are designed to operate at higher
temperatures.
5. Protect the power cable from coming in contact with
sharp objects.
6. Do not kink power cable and never allow the cable to
come in contact with oil, grease, hot surfaces, or
chemicals.
7. Make certain that the power source conforms to the
requirements of your equipment.
8. When cleaning electrical or electronic equipment,
always use an approved cleaning agent such as dry
cleaning solvent.
9. Not recommended or certified as an explosion proof
blower.
MAINTENANCE
WARNING: ALWAYS DISCONNECT POWER SUPPLY
BEFORE SERVICING THE BLOWER OR WORKING
WITH THE UNIT FOR ANY REASON. THIS IS
ESPECIALLY IMPORTANT WITH UNITS EQUIPPED
WITH AUTOMATIC RESET THERMAL PROTECTION.
UNIT MAY ACTIVATE WITHOUT WARNING!
WARNING
FIRE OR EXPLOSION HAZARD
IMPROPER INSTALLATION, ADJUSTMENT,
ALTERATION, SERVICE OR MAINTENANCE
CAN CAUSE DEATH, SEVERE INJURY
AND/OR PROPERTY DAMAGE.
1. Do not force the gas control knob. Use only your
hand to turn the gas control knob. Never use tools.
2. If the gas control knob will not operate by hand, a
qualified service technician should replace the gas
control.
GAS CONTROL KNOB SETTING
The gas control knob or handle has two settings:
"OFF"
prevents the main burner gas flow.
"ON"
permits main burner gas flow. Under control of the
thermostat and direct ignition control module, gas can flow
to the main burner.
PRE-CONDITlONS TO BE CHECKED
BEFORE BURNER SYSTEM STARTUP
1. System has been installed to Combustion Research
Corporation recommendations in Installation Manual
and nameplate data.
2. The system as installed must be installed with
adequate clearance to combustibles as outlined in this
manual. In storage areas where stacking of materials
may occur, the installer must provide signs that specify
the maximum stacking height so as to maintain the
required clearance to combustibles.
3. Electrical input to each heating zone is typically a 20
to 30-amp service, 115V AC/60 HZ (1-Ph).
a. All main disconnects closed and fuses OK.
b. All service disconnect switches at each burner and
exhauster turned on.
!