Commercial Air to Water Heat Pump Water Heater
15
INSTALLATION
SAFE TRAY
Where damage to property can occur in the event of the wa-
ter heater leaking or condensate forming under the drain tray,
the water heater must be installed in a safe tray or be suitably
bounded. Construction, installation and draining of a safe tray
must comply with all local codes and regulatory authority re-
quirements.
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown
in the table below, an approved pressure limiting valve is re-
quired and should be fitted as shown in the installation dia-
gram.
TANK WATER SUPPLY
If the storage tank is supplied with water from a tank supply
and a pressure pump system is not installed, then the bottom
of the supply tank must be at least 3.2 ft above the highest
point of the hot water plumbing system, including the storage
tank. Care must be taken to avoid air locks. The cold water
line to the storage tank should be adequately sized and fitted
with a full flow gate valve or ball valve.
HOT WATER DELIVERY
This water heater can deliver water at temperatures which
can cause scalding.
It is necessary and we recommend that a temperature limit-
ing device be fitted between the storage tanks and the hot
water outlets in any ablution area such as a bathroom or en-
suite, to reduce the risk of scalding. The installing plumber
may have a legal obligation to ensure the installation of this
water heater system meets the delivery water temperature
requirements of UL 1995 so that scalding water tempera-
tures are not delivered to a bathroom, ensuite or other ablu-
tion area.
Where a temperature limiting device is installed adjacent to
the storage tanks, the cold water line to the temperature lim-
iting device can be branched off the cold water line either
before or after the ball valve, pressure limiting valve and non
return valve to the water heater system. If an expansion con-
trol valve is required, it must always be installed after the non
return valve and be the last valve prior to the storage tanks.
If a pressure limiting valve is installed on the cold water line
to the water heater system and the cold water line to a tem-
perature limiting device branches off before this valve or from
another cold water line in the premises, then a pressure limit-
ing valve of an equal pressure setting may be required prior
to the temperature limiting device.
Two Temperature Zones Using a Temperature Limiting Device
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