Laars MSTWW199, Руководство по эксплуатации

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Mascot ST Tankless Water Heater
Page 35
4.18 DIP Switches
There is one set of DIP switches.
DIP switches 6 and 7 must be set to OFF when operating the water heater normally.
Shown in it’s actual
orientation in the unit.
Maximum flame detecting voltage 2.4V
Pre-purge time (Tp) Maximum 10s, minimum 1s
Safety Time (igniting time) (Ts)
3.5s
Igniting interval time
<10s
Post-purge time (Tip) 180s
Over-heating 1,2,3 protection detection time
<1s
Temperature sensor fault detection time <2s
Nr. of trial for ignition (Ntl)
10
DHW water SET temperature range 35°C~ maximum DHW setpoint temperature(default: 60°C)
DHW water OFF temperature DHW target tempe DHW differential temperature(15°C)
DHW water ON temperature Below DHW target tempe3°C
DHW water ON minimum water flow 2ℓ(12Hz)
DHW water OFF minimum water flow 1.5ℓ(8Hz)
Table 14.
System Control Settings
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Headquarters:
20 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com Litho in U.S.A. © Laars Heating Systems 1706 Document 4286B
800.900.9276
•
Fax 800.559.1583
(Customer Service, Service Advisors)
20 Industrial Way, Rochester, NH 03867
•
603.335.6300
•
Fax 603.335.3355 (Applications Engineering)
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8
•
905.238.0100
•
Fax 905.366.0130
www.Laars.com
Document 4286B
The
ST Gas Conversion Kit
pg 3 of 4
Table B DIP Switch Settings
Figure D
15.
Per Table B, s
et DIP Switch
5 to OFF for LP Propane
.
16.
Turn ON the
GAS
and
WATER supply to the Mascot ST.
17.
Turn ON
the Mascot ST.
NOTE:
If your Mascot ST is installed at an altitude greater than
2,000 ft, then the correct altitude setting should have
been set previously and saved within the Control Display. If this has not been done, Refer to Section 4.12 of the
Mascot ST Install and Operating Manual (document #1316) before continuing with this Gas Conversion.
18.
Connect a manometer to the manifold pressure port. See Figure D. For dual port manometers, use the positive
pressure side. Check for proper manifold gas pressure. Refer to Table D. You must have acceptable gas manifold
pressure before continuing.
19.
Establish a call for heat. You may need to disconnect the outdoor reset if you are making this gas conversion
during warm weather.
20.
Setup your combustion analyser and place the sensor into the combustion test port.
21.
Per
Table B for Max Fire
,
change dip switch 6 to ON and 7 to OFF. The unit will cycle up to MAX fi re.
22.
WAIT for your combustion analyser to stabilize. This may take up to 3 minutes depending on your combustion
analyser. Then check the CO
2
measurement for MAX fi re. Refer to Table C for acceptable MAX fi re
combustion readings
Do NOT adjust CO2 at MAX Fire. ONLY in MIN Fire, so...
23.
Per
Table B for MIN Fire
,
change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire.
24.
WAIT for your combustion analyser to stabilize. Then check the CO
2
measurement for MIN fi re. Refer to Table
D for acceptable MIN fi re combustion readings
25.
Open the Gas Valve Adjustment Port by removing the cap screw with a 4mm Allen wrench.
ON OFF
#
MIN Fire
Normal Operation
7
MAX Fire
Normal Operation
6
NG Natural LP Propane 5
Inlet fl ow Over-
ride
ON Inlet fl ow Over-
ride
OFF
4
Normal Operation
Do Not Touch
3
Normal Operation
Do Not Touch
2
Normal Operation
Do Not Touch
1
+
-
Adjust CO
2
In MIN Fire only.
26.
Then use the 4 mm Allen
wrench to make a minor
adjustment (1/8 turn) to either
increase or decrease CO
2
.
27.
It may be necessary to go
back and forth between
HI Fire and LOW Fire
several times (and making
adjustments only at LOW
Fire), before
CO
2 at both are
within acceptable levels. Be
sure to put the adjustment
port cap screw back onto the
valve when done.
DIP Switch Function OFF ON
1-3
Machine power Do NOT Move.
4 OVER-RIDE
Inlet DHW Flow Limiter OFF ON
5 Propane or Natural Gas LP NG
6
Max.
Normal
MAX Fire
7
Min.
Normal
MIN Fire
Table 15. Dip Switches