Manual Steam Output Adjustment (B Models); Servicing The Unit; Fault Conditions; Service Checks - Nortec GH Series Instaliation, User & Maintenance Manual

MANUAL STEAM OUTPUT ADJUSTMENT
(8 Models)
Manual rate adjustment for GH Series units is
accomplished by rotating the output adjustment
selector that is located on the switch panel behind the
locked door panel. Rotate the knob labeled "Output"
clockwise to increase output and counter clockwise to
decrease output. See specifications for output values.
SERVICING THE UNIT
Caution: Disconnect power before servicing this
appliance.
Caution: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation.
The combustion chamber, heat exchanger and
flue baffles are all fabricated from stainless steel and
do not require cleaning.
This appliance is equipped with a self diagnostic
ignition module which identifies the fault code with a
flashing LED. The LED's are located at the switch
panel and correspond to their respective ignition
modules from left to right looking from the burner entry
side. Most problems can be identified with this code.
Refer to Fault Conditions on page 17 and
Troubleshooting Guide on page 18.
Should the main burner fail to light, or flame is not
detected during the first trial for ignition period, the gas
valve is de-energized and the control goes through an
interpurge delay before another ignition attempt. The
control will attempt two additional ignition trials before
going into lockout. The valve relay will be
de-energized immediately, and the combustion blower
will be turned off.
Recovery from lockout requires a manual reset by
either resetting the humidistat or removing 24 volts for
a period of 5 seconds.
FAULT CONDITIONS
Error Mode LED Indication
Internal Control Failure
Steady on
Air Flow Fault 1 Flash
Flame With No Call For Heat 2 Flashes
Ignition Lockout 3 Flashes
- 17 -
The LED will flash on for 1/4 second, then off for
1/4 second during a fault condition. The pause
between fault codes is 3 seconds.
SERVICE CHECKS
Flame current is the current which passes through
the flame from the sensor to ground. The minimum
flame current necessary to keep the system from
lockout is 0.7 microamps. To measure flame current,
connect an analog DC microammeter to the FC- FC+
terminals on the module. Meter should read 0.7 uA or
higher. If meter reads below "0" on scale, meter leads
are reversed. Disconnect power and reconnect meter
leads for proper polarity.
NOTE: Proper polarity of supply voltage to the
unit is necessary for flame sensing to occur.