21
Document: GFH-NT 1500-4000 IM 14 DEC 2016
Gas Fired Heater Instructions
©2016 NOVATEC, Inc. All Rights Reserved
11.0
PROCESS TEMPERATURE ADJUSTMENT
T
he process air temperature is set by adjusting the Process Temperature Set point on the
NOVATOUCH PLC Controls on the desiccant Dryer. Note that adjusting the set point under 100
F disables the Flame On Alarm, allowing the Gas fired heater to be shut down by its own
disconnect switch while the dryer continues to operate
Complete details on operating the NOVATOUCH PLC controls can be found in the manual that is
supplied separately.
12.0
GAS HEATER SETUP PROCEDURES
NOTE:
The gas heater has been fully adjusted at the factory and field adjustments are usually not
necessary. These procedures are shown only as a reference should it become necessary to make
field adjustments.
Only qualified technicians should make these adjustments.
Field
adjustments may be necessary to compensate for installation variations or if components are
replaced.
Adjustments in addition to those shown may be needed. The information in this
manual is provided as a guideline for professionals with knowledge of gas heating
appliances, and therefore does not include specific instructions to cover every situation.
Set the main gas trim valve full open. Turn the pilot gas-metering valve to full open. Adjust the
main and pilot regulators to half-open. Adjust the combustion blower damper half-open.
Set/check/adjust air and gas pressures as required using a water manometer or other appropriate
apparatus according to the procedure that follows. Check for gas leaks at all connections with gas
leak detector fluid or suitable electronic device.
Make sure the gas is turned off when test plugs are removed to install temporary fittings and when
the plugs are re-installed after testing. Some adjustments are made with the flame on as noted.
The others are made with the flame off and only the blowers energized.
The burner is controlled and monitored by the burner controller as shown on the electrical
schematic. The manufacture's bulletin for the burner controller is located elsewhere in this manual.
1.0
ADJUST COMBUSTION AIR PRESSURE SWITCH (APS)
1.1
The APS is open when the heater is off or if combustion airflow is not present. The
switch should be adjusted to the setting as shown in the Engineering Data section
under Instrument Settings.
2.0
ADJUST LOW GAS PRESSURE SWITCH (LGPS)
2.1
The LGPS is open if the main gas pressure is low. The switch should be adjusted to
16" WC. The neon indicator will glow (visible through the clear plastic cover on the
switch) when the switch is closed.
