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Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual
minimum of 5.0" w.c. for natural gas or 10.4" w.c. for LP/
propane
gas should be maintained for proper unit operation.
2. After line pressure has been checked and adjusted, check
manifold
pressure. Correct manifold pressure is shown on the
unit
rating plate. See figure 10 for gas pressure adjustment
screw
location. A natural gas to LP/propane gas changeover
kit
is required to convert unit. Refer to installation instructions
provided
with changeover kit for conversion procedure.
LIMIT CONTROL
The limit control switch is factory set and not field adjustable.
LOUVER VANE ADJUSTMENTS
Rotate louver vanes to direct airflow upward, downward, straight,
or
any combination of these directions. When unit is installed in an
inverted position, louvers may be positioned in the same manner.
COMBUSTION AIR PRESSURE SWITCH
This pressure switch checks for proper combustion air blower
ope
ration before allowing an ignition trial. The switch is factory
set and no field adjustment is necessary.
FLAME ROLLOUT SWITCH
The flame rollout switch(es) are located on the burner box top,
behin
d the ignition control board. This normally closed switch
opens
on a temperature rise. Check for adequate combustion air
before
manually resetting switch.
SERVICE
CAUTION Turn off gas and electrical power to unit before
performing
any maintenance or service operations on this unit.
Remember to follow lighting instructions when putting unit back
into
operation after service or maintenance.
If
any of the original wire as supplied with the appliance must be
replaced, it must be replaced with wiring material having a
tempe
rature rating of at least 105°C.
Do
not use this appliance if any part has been under water.
Immedi
ately call a qualified service technician to inspect the
appliance
and replace any gas control which has been under
water.
BURNERS
1. Periodically examine burner flames for proper appearance
during the heating season.
2. Before each heating season examine the burners for any
deposits
or blockage that may have occurred.
3. Clean burners as follows:
• Turn off both electrical and gas supplies to unit.
• Disconnect gas supply piping, high tension and sensor
leads.
Remove gas manifold. Remove burner tray.
• Clean burners as necessary. Make sure that burner
heads
line up properly to ensure flame crossover.
Che
ck spark gap on electrode and adjust if required. The
gap
should be between 0.110 inch and 0.140 inch
(2.
79mm to 3.56mm). The gap may be checked with
app
ropriately sized twist drills or feeler gauges.
• Reinstall burner tray, gas manifold, high tension and
sensor
leads. Reconnect gas supply piping.
• Restore electrical power and gas supply. Follow lighting
instructions
to light unit. Check burner flame.
FLUE PASSAGEWAY AND FLUE BOX
The flue passages and flue box should be inspected and cleaned
prior
to each heating season. The sequence of operation should be
as
follows:
1. Turn off both electrical and gas supply to unit.
2. Disconnect combustion air blower wiring.
3. Remove screws securing flue box to unit. Remove flue box. If
necessa
ry, remove blower assembly from flue box. Clean
fl
ue box with wire brush.
4. Remove turbulator retention bracket and turbulators. Clean
turbul
ators with wire brush.
5. Remove burners as described in section “BURNERS” section.
6. Clean tubes with a wire brush.
7. Reassemble unit. The combustion air and flue box gaskets
shoul
d also be replaced during reassembly.
8. Restore electrical power and gas supply. Follow lighting
instructions
to light unit. Check operation of unit.
TABLE 4
NATURAL GAS MANIFOLD PRESSURES - IN.WC. (KPA)
TABLE 5
LP/P
ROPANE GAS MANIFOLD PRESSURES - IN.WC. (KPA)
ALTITUDE FT. (M)
45/75 10 (2.49)* 8.0 (1.99)
MHU
45/75 HSU45/75 0-2000 2 000-4500
(0-
610) (610-1370)
ALTITUDE FT. (M)
45/75 4.0 (0.99)* 3.6 (0.89)
MHU
45/75 HSU45/75 0-2000 2 000-4500
(0-
610) (610-1370)
*No adjustment required.
*No adjustment required.