33
The DHW is cold when only a
single fixture is open.
• The unit will not heat the water if the flow rate is less than
0.4 gallons (1.5 L) per minute.
* Minimum activation flow rate: 0.4 GPM (1.5 L/min)
Minimum operating flow rate: 0.29 GPM (1.1 L/min)
Open the fixture more or open other fixtures so that a greater flow
passes through the unit, and the unit should begin heating again.
Fluctuations in DHW temperatures. • Set water temperature at 115°F to 120°F or 48°C (118°F) to
50°C (122°F). This will allow you to use a higher flow of hot
water thus meeting the minimum flow requirement of 0.29 GPM
(1.1 L/min).
* Minimum activation flow rate: 0.4 GPM (1.5 L/min)
Minimum operating flow rate: 0.29 GPM (1.1 L/min)
• Clean the water filter of any debris
. ( page 29)
DHW temperature setting cannot rise.
• Is the maximum temperature setting appropriate?
( page 20)
Amount of DHW
The amount of DHW at a certain
fixture is not constant.
•
When hot water is demanded at other fixtures, the amount
available may be reduced. The maximum flow available from
the unit is 8.4 GPM (32 L/min) at a 45
°
F (25°C) temperature
rise.
• Pressure fluctuations and other plumbing conditions can
cause the temperature and pressure at a fixture to be
unstable, but it should stabilize after a short time.
• There are some types of hot water taps that discharges
large volumes of hot water at first but stabilize after time.
• To keep the temperature stable, the heater limits the
amount of water that can flow through it to a small amount
initially, but the amount increases over time.
Amount of DHW available has
decreased over time.
• Is the water filter clogged? (
page 29)
• If the supply water is hard and has not been treated,
scale can build-up in the Combi Boiler and decrease
the maximum amount of hot water available. Scale can
be removed from the Combi Boiler by flushing the unit
periodically. To prevent scale from forming in the Combi
Boiler, a water softener or scale inhibitor is recommended.
Summary of Contents for GHQ-C3201WX-FF PB US
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