Nortek Reznor RHC DJL 8000, Установка, пусконаладка, обслуживание

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RHC 8000 EN April 2019 D301207 Issue C Page 21
The gas pressure is set for the required
heat input before the appliance leaves the
factory, normally provided the gas supply
to the air heater is in accordance with the
supply pressure described on the appliance
data plate theoperating pressure will not
require adjustment. To check the pressure,
the following procedure should be carried
out:
• Ascertain from section 2 of this
document and the appliance data plate
the correct operating gas pressure for
the air heater;
• Turn the room thermostat control to its
lowest setting (see instructions of the air
handler);
• Remove the screw from the outlet
pressure test point of the multi-
functional control valve. Connect a
manometer to the test point;
• Adjust the room thermostat to call
for heat e.g. above room ambient
temperature;
• Observe the burner gas pressure on
the manometer and compare to the
required pressure (tables );
• If necessary, adjust the burner gas
pressure. Remove the cover screw
(Honeywell application). Turn the
regulator screw anti- clockwise to
decrease pressure or clockwise to
increase pressure;
• Set room thermostat to lowest setting
to turn OFF the burners. Replace the
test point screw (if removed) and with
the main burner alight, test for gas
soundness using a soapy solution.
• Reset temperature control/room
thermostat to comfort operating level.
5.5.2 Modureg V7335A 2000
Series Modulation System
The Modureg V7335A 2000 Series
Modulating gas pressure regulators are an
optional addition which can be used on
“Honeywell” Multifunctional gas controls
for modulating the burner gas pressure for
firing over the range 50% to 100% of the
nominal high fire burner rate.
Caution: Heaters must be
controlled so that burner start-up
takes place in the high fire (100%)
mode.
Modureg gas pressure regulators require
to be powered by a maximum 24 V DC
voltage over the range 15 - 165 mA
maximum. Maximum outlet pressure occurs
at the high set point value (high fire).
Minimum outlet pressure occurs at low set
point value (low fire). The power signal may
be obtained from
a system amplifier which may be an integral
control within the appliance or, from a
remote control system designed to provide
the required controlling voltages.
Adjusting the V7335A Regulator : refer to
figure 10.
To check the minimum or low fire and
maximum or high fire pressures for limits of
modulation use the following procedures.
Fit a manometer to appliance burner
pressure test point.
Important : allow time for gas pressure to
stabilise before making adjustments.
To Set Minimum (low fire) 50% or 30% rate
(see table 14)
1. Remove regulator cover cap;
2. Disconnect electrical connection to the
regulator coil;
3. Energise operator, set control in
operation and wait until outlet pressure is
recorded on manometer;
4. Use a 9 mm wrench to turn the minimum
rate adjustment screw clockwise to increase
or counter- clockwise to decrease the
minimum pressure setting;
CAUTION