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Measuring Gas Pressure; Electrical Connections; Electrical Power Supply - Bosch Greentherm T9800 SEC 199 Installation And Operating Instructions Manual

Indoor residential and commercial tankless water heaters
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4.13 Measuring gas pressure

4.13.1 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.34).
▶ Loosen the screw inside test port fitting (do not remove)
and connect the manometer tube to the test port (see
Fig. 34).
Static Pressure Test
▶ Turn the gas supply back on.
▶ Record the static gas pressure reading in table 18.
Dynamic Pressure Test
▶ Turn ON the appliance.
▶ Access menu P1 Max. Power, see section 6.6.
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
Inlet gas Pressure
Table 17 Minimum inlet gas pressure under full operation
1) To assure maximum heat input at maximum vent length, the
minimum gas pressure should be 5" W.C. for the 199 kBTU
models and 4" W.C. for the 160 kBTU models. For more
information see section 4.6.3.
▶ 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 to keep the water heater in P1.
▶ Record the lowest operating gas pressure reading in
table 18.
▶ Turn OFF the appliance.
▶ Shut off gas supply.
▶ Disconnect the manometer tube from the test point.
▶ Tighten the screw inside test point fitting.
Depending on the vent length, gas pressures below 5" W.C. for
Natural Gas or 8" W.C. for LPG may result in reduced power
output or possible error codes and must be corrected. See Gas
Connections, chapter 4.8, page 30.
Greentherm T9800 SE 160/199 | SEC 199
NG
LPG
1)
3.5" WC
8" WC
Fig. 34
Gas pressure test port
[1] Gas pressure measuring port
Static Gas Pressure Reading
Dynamic Gas Pressure
Reading
Table 18 Inlet gas pressure readings
5

Electrical connections

5.1

Electrical power supply

WARNING:
▶ For safety reasons, disconnect the
power supply cord to the water heater
before any service or testing is
performed.
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.
WARNING:
▶ Modification of or tampering with the
power supply cord is prohibited.
▶ Use of extension cords is prohibited.
The water heater requires an electrical power supply from a
120VAC / 60Hz properly rated receptacle and must be
properly grounded.
The water heater is wired as shown in the wiring diagram
(chapter 10, Fig. 61).
Electrical connections | 39
Gas pressure
Date
6 720 816 815 (2018/08)

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