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Installation instructions
Fig. 39 Space heating diagram
[1]
Hot water outlet
[2]
Cold water inlet
[3]
Pressure relief valve
[4]
Gas supply
[5]
Shut off gas valve
[6]
Thermal expansion tank (as required)
[7]
Atmospheric vacuum breaker
[8]
Cold inlet
[9]
Check valve
[10] Pump
[11] Thermostatic mixing valve
[12] Thermometer (optional)
[13] DHW outlet
[14] Water to water heat exchanger
[17] Thermostat
[18] Space heating zone
[19] Zone controller
[20] Space heating pump
[21] Expansion tank
[22] Pressure relief valve
4.14
Measuring gas pressure
Confirm gas pressure upon installation.
Connecting manometer
▶ Shut off gas supply at installer supplied shutoff valve for this water
heater.
▶ Remove front cover and locate inlet gas pressure test port (see
Fig.41).
▶ Loosen screw inside left test point fitting (do not remove) and
connect manometer tube to test point.
Static Pressure Test
▶ Turn gas supply back on.
▶ Record static gas pressure reading in table 33.
32
Operating Pressure Test
▶ Press ON/OFF button
into ON.
▶ Immediately following, press and hold simultaneously buttons
or
and
for 3 seconds, until display reads P2.
P
Fig. 40
▶ Press
to enter P2 adjustment. The current setting will appear on
P
the display (factory default).
+
▶ Press
or
until P1 appears.
Note: While in this mode the appliance will run constantly at maximum
power and allow maximum water flow.
For inlet gas pressure adjustment consider the following table:
Gas type
p
in
Table 32 Minimum inlet gas pressure under full operation
▶ Operate all other gas appliances (except heater) on same gas piping
system at maximum output.
▶ Turn on high volume of hot water flow (at least 6 gpm) (1tub and 2
sinks should be sufficient) and burner will light. If heater display
reverts to P2, open more hot water fixtures to allow sufficient flow.
+
Press
until P1 reappears on the display.
NG
LPG
3.5" WC
8" WC
RTG 199 ME – 6 720 811 615 (2015/04)
+
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