6 720 644 942
2
Index
Index
1
Warning
2
2
Appliance details
3
2.1
520 HN specifications (Technical data)
3
2.2
Unpacking the 520 HN heater
4
2.3
General rules to follow for safe operation
4
2.4
Dimensions and installation clearances
5
3
Installation instructions
6
3.1
Introduction
6
3.2
Proper location for installing your heater
6
3.3
Venting
6
3.4
Combustion air requirements
9
3.5
Mounting Heater
9
3.6
Gas piping & connections
11
3.7
Measuring gas pressure
13
3.8
Water connections
13
3.9
Recirculation application
14
4
Operation instructions
14
4.1
For your safety, read before operating your water heater 14
4.2
Lighting instructions
15
4.3
To turn off appliance
15
4.4
Adjusting the water temperature
15
4.5
Power adjustment knob
16
4.6
Draining the appliance
16
5
Maintenance and service
17
5.1
Maintenance intervals
17
5.2
Water valve
17
5.3
Pilot
17
5.4
Main burners
18
5.5
Vent assembly
18
5.6
Mineral scale build-up
18
6
Troubleshooting
19
6.1
Introduction
19
6.2
No spark at pilot with water flow
19
6.3
Spark appears when hot water is turned on,
but pilot and burners will not ignite
19
6.4
Pilot lights, but burners will not come on.
20
6.5
Main burners go out during hot water use
20
6.6
Hot water temperature fluctuates at tap
21
6.7
Water is too hot
21
6.8
Water is not hot enough
22
6.9
Low hot water pressure
22
6.10
Noise when heater is running
22
6.11
Burners do not burn cleanly, yellow
flames when operating
22
7
Protecting the environment
23
8
Interior components and diagram parts list
24
8.1
Interior components
24
8.2
Components diagram
25
8.3
Parts list
26
9
Fifteen Year Limited Warranty
27
1
Warning
Fig. 1
Warning:
The heater must be isolated
from the gas supply piping system
during any pressure testing of that
system at test pressures equal to or
more than 0.5 psig.
Caution:
Any
changes
or
modifications not expressly approved
by the party responsible for compliance
could void the user’s authority to
operate the equipment.
HOT
BURN
D A N G E R
Water temperature over 125°F can
cause severe burns instantly or
death from scalds.
Children, disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
6720608643-16.1AL
