Installation instructions
RTG 199 ME – 6 720 811 615 (2015/04)
32
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
▶ 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.
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.
Fig. 40
▶ Press
to enter P2 adjustment. The current setting will appear on
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:
▶ 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.
Gas type
NG
LPG
p
in
3.5” WC
8” WC
Table 32 Minimum inlet gas pressure under full operation
+
P
P
+
+
Summary of Contents for RTG 199 MEN
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