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Greentherm 9800 SEO 160/199 | SECO 199
Electrical connections | 25
6.6
Measuring gas pressure
6.6.1 Gas supply pressure
Confirm gas pressure upon installation.
Connecting manometer
▶ Shut off gas supply at installer supplied shutoff valve for
this water heater.
▶ Locate the inlet gas pressure test port (see Fig.19).
▶ Loosen the screw inside test port fitting (do not remove)
and connect the manometer tube to the test port (see
fig. 19).
Static Pressure Test
▶ Turn the gas supply back on.
▶ Record the static gas pressure reading in table 12.
Dynamic Pressure Test
▶ Turn ON the appliance.
▶ Access menu
P1 Max. Power
, see chapter 10.11.2.
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 the
same gas piping system at maximum output.
▶ Open all hot water taps to achieve a flow rate of at least 6
gallons per minute. (1 tub and 2 sinks should be sufficient).
If heater goes back to P2, open more hot water fixtures to
allow sufficient flow and access to P1.
▶ Record the lowest operating gas pressure reading in
▶ Turn OFF the appliance.
▶ Shut off gas supply.
▶ Disconnect the manometer tube from the test point.
▶ Tighten the screw inside test point fitting.
Gas pressures lower than 3.5" W.C. for Natural Gas or 8" W.C.
for LPG may result in reduced power output.
Fig. 19
Gas pressure test port
[1] Gas pressure measuring point
7
Electrical connections
7.1
Electrical power supply
Gas type
NG
LPG
Inlet gas pressure
3.5” WC
8” WC
Table 11 Minimum inlet gas pressure under full operation
Gas pressure
Date
Static Gas Pressure Reading
Dynamic Gas Pressure
Reading
Table 12 Inlet gas pressure readings
WARNING:
▶ For safety reasons, disconnect the
power supply cord to the water heater
before any service or testing is
performed.
WARNING:
▶ For safety reasons install a proper
waterproof outlet.
WARNING:
▶ This water heater must be electrically
grounded in accordance with the most
recent edition of the National Electrical
Code. NFPA 70. In Canada, all electrical
wiring to the heater must be in
accordance with local codes and the
Canadian Electrical Code, CSA C22.1
Part 1. Do not rely on the gas or water
piping to ground the metal parts of the
heater.
