Addison UHA 150, Инструкция по установке, эксплуатации и обслуживанию

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SECTION 11: O
PERATION AND
M
AINTENANCE
29 of 49
Fi g ure 14: Gas Valve for Models UHA[X][S] 150 - 400
11.2.2 Start-Up the Gas Valve (All Gases)
11.2.2.1 Check Burner Gas Pressure
1. Remove the pl u g in the o u tlet ( bu rner) press u re
test point and connect a press u re tap and a
manometer.
2. With the bu rner firing, meas u re the press u re on
the manometer. To adj u st the bu rner press u re,
remove the reg u lator cover from the valve and
t u rn the reg u lator adj u stment scre w to set the
req u ired bu rner press u re as stated in the
Technical Data Ta b le for the correct gas and
model on Page 48, Section 16.3 .
NOTE: If the correct bu rner press u re cannot b e
reached, then check the inlet press u re to the valve
w ith the bu rner firing. See Technical Data Ta b le on
Page 48, Section 16.3 for inlet press u re
req u irement.
Do not continue to adjust the re g ulator if the
pressure is not chan g in g .
If the inlet press u re is too lo w to allo w correct bu rner
press u re setting, then the gas inlet press u re m u st b e
corrected b efore completing the start- u p.
Check Gas Rate
1. After bu rner press u re adj u stment, allo w the
heater to operate for at least 15 min u tes and
then re-check settings. Adj u st press u re setting
if necessary.
2. Check gas flo w rate at gas meter.
3. T u rn off heater and electrical s u pply.
4. Remove the manometer and refit all covers to
the valve and tighten the scre w of the o u tlet
press u re tap.
11.2.3 Pressure Switch
The press u re s w itch is factory pre-set for each
model and is not adj u sta b le.
11.2.4 Turnin g Off the Heater
Set the thermostat to the "OFF" position or lo w est
setting and the main bu rner w ill stop.
The fan w ill contin u e to r u n u ntil it is stopped
a u tomatically b y the fan thermostat.
Do not use a disconnect switch for control of
heater. Disconnect switch will turn off the fan.
Heat exchan
g er could be dama g ed. Warranty will
not cover dama g e to the heat exchan g er if
operated improperly. Only use the disconnect
switch for turnin
g off heater for service or durin g
off-season.
½PSI
I
N
C
O N
OFF
Regulator
Outlet
Pressure
Gas Inlet
Inlet Pressure
TOP VIEW
END VIEW
Description Part Number
Gas Valve 150 - 250 NG 90032505
Gas Valve 150 - 250 LP 90032506
Gas Valve 300 - 400 NG 90032520
Gas Valve 300 - 400 LP 90032521