13
1. Fill the water heater by opening the cold water shut-off valve.
Purge air from the system by opening a hot water outlet at a fixture
in a kitchen or bathroom. When water flows freely from the outlet, the
system is purged.
Part 5 - Start-Up and Operation
When filling the water heater, open a hot water tap to release air in
the tank and piping to ensure proper water heater operation. Failure
to ensure the water heater is full before turning on the system will
result in damage to the water heater, and could result in property
damage. Such damages ARE NOT covered by warranty.
2. Check the system for leaks.
Fix any leaks before continuing the installation. Failure to do so
could result in property damage or personal injury.
Risk of scald injury increases as you increase water temperature.
Figure 13 - Sealing the Water Heater for Sanitary Applications
3. After ensuring there are no leaks within the system, flush the system
to clear any soldering residue. Many soldering fluxes contain Zinc
Chloride, which can corrode stainless steel.
Draw at least three times the volume of the water heater to properly
flush the system.
4. Initiate a call for hot
water. Ensure each
zone valve or circulator
operates only when its
thermostat calls for heat.
Purge each zone of air to
ensure proper operation.
5. Set the water heater to
the desired temperature.
Boiler high limit should
be set at least 20
o
F
higher than the heater
temperature. Set the low
limit of the boiler control
at the minimum setting
- this will call the burner
on only to satisfy the tank
control.
A water heater
temperature setting of
120
o
F is recommended.
However, a lower
temperature setting may
be required to comply
with local and state codes
for normal operation.
The differential should
be set at 10 to 15
o
F. Installation conditions may require a higher or
lower temperature setting. A mixing valve in conjunction with a high
temperature setting may be used for high demand applications (spas,
hot tubs, whirlpools).
6. When the system is completely flushed, purged of air, and the
temperature is set, turn on the boiler. Observe operation. Ensure the
boiler shuts down after the indirect water heater set point is satisfied.
Repair Parts
Thermostat:
Honeywell L4080B
Stock code: 51292
Temperature and Pressure Relief Valve:
PP-40: Watts 100XL-8 (100 Mbh, 8” element)
PP-60/80/120: Watts 40XL-8 (200 Mbh, 8” element)
