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IM 1287-4 • REBEL APPLIED ROOFTOP 138 www.DaikinApplied.com
Unit Maintenance
Burner and Gas Manifold Pressure Adjustment Instructions
2-Stage Furnaces
1. Read gas pressure P1 at the Inlet Pressure Tap of the
two stage valve (
) and confirm pressure
matches the value specified in
capacity and modulation configuration. Adjust upstream
pressure reducing gas regulator as required to obtain
.
2. In main cabinet control panel, set Microtech 4 controller
to manual mode. Specify high fire operation by
setting “Htg Stage 2” menu item to ON. Back at the
furnace, read gas pressure P2 on the burner manifold
pressure tap. Confirm P2 pressure matches the HIGH
value specified in table S for your unit’s capacity and
modulation configuration. If adjustment is required, adjust
the HI regulator on the two stage gas valve (
3. In main cabinet control panel, set MicroTech 4 controller
to manual mode. If “Htg Stage 2” menu item is set to
ON, turn it OFF. Specify low fire operation by setting “Htg
Stage 1” menu item to ON. Back at the furnace, read
gas pressure P2 on the burner manifold pressure tap.
Confirm P2 pressure matches the LOW value specified
in table S for your unit’s capacity and modulation
configuration. If adjustment is required, adjust the Lo/
Med regulator on the two stage gas valve (
).
4-Stage Furnaces
1. Read gas pressure P1 at the Inlet Pressure Tap of the
two stage valve (
) and confirm pressure
matches the value specified in
capacity and modulation configuration. Adjust upstream
pressure reducing gas regulator as required to obtain
.
2. In main cabinet control panel, set MicroTech 4 controller
to manual mode. Specify high fire operation by setting all
“Htg Stage” menu items to ON. Back at the furnace, read
gas pressure P2 and P3 on the burner manifold pressure
tap. Confirm both P2 and P3 pressures match the HIGH
value specified in
for your unit’s capacity and
modulation configuration. If adjustment is required, adjust
the HI regulator on the relevant two stage gas valve
(
3. In main cabinet control panel, set MicroTech 4 controller
to manual mode. If any “Htg Stage” menu items are
ON, turn them OFF. Specify low fire operation by
turning “Htg Stage 1” ON. Back at the furnace, read gas
pressure P2 and P3 on the burner manifold pressure
taps. Confirm both P2 and P3 pressures match the LOW
value specified in
for your unit’s capacity and
modulation configuration. If adjustment is required, adjust
the Lo/Med regulator on the relevant two stage gas valve
(
Modulating Furnaces
1. Read gas pressure P1 at the Inlet Pressure Tap of the
two stage valve (
) and confirm pressure
matches the value specified in
capacity and modulation configuration. Adjust upstream
pressure reducing gas regulator as required to obtain
.
2. In main cabinet control panel, set MicroTech 4 controller
to manual mode. Specify high fire operation by “Htg
Valve” menu item to 100%. Continue to specify high
fire operation by setting all available “Htg Stage” menu
items to ON. Back at the furnace, read the gas pressures
specified in
for your configuration on the burner
manifold pressure taps. Confirm each pressure matches
the HIGH value specified for each manifold in
for your unit’s capacity and modulation configuration.
If adjustment is required, adjust the HI regulator on the
relevant staged gas valve (
).
3. In main cabinet control panel, set MicroTech 4 controller
to manual mode. Specify low fire operation by setting all
available “Htg Stage” menu items to OFF. Continue to set
low fire operation by setting the “Htg Valve” menu item to
Table 38 below
.
At the furnace, read gas pressure P2 on the burner manifold
pressure tap. Confirm P2 pressure matches the LOW value
specified in
for your unit’s capacity and modulation
configuration. If adjustment is required, adjust the Lo/Med
regulator on the two stage gas valve (
). If fine
adjustments are required, refer to the
documentation.
Table 39: Modulating Furnace Low Fire “Htg Valve” Value
Furnace
Capacity
200
MBH
(58 .6)
400 MBH
(117 .2)
600 MBH
(175 .8)
800 MBH
(234 .5)
1200 MBH
(329 .7)
Modulation
5:1
5:1
10:1
5:1
10:1 10:1 20:1 10:1 20:1
Low Fire
“Htg Valve”
Setting
20%
20%
40% 20%
20%
40% 20%
Modulation
5:1
5:1
10:1
5:1
10:1
6:1 12:1 6:1
12:1
Low Fire
“Htg Valve”
Setting (LP)
20%
20%
40% 20%
33%
63% 31%
Содержание Rebel Applied DPSA
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Страница 147: ...Figure 181 600 MBH 5 1 Modulation 400 MBH and 600 MBH 10 1 Modulation ...
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