8
Installation and Servicing
SECTION 1 - GENERAL
1. GENERAL
1.1 INTRODUCTION
The Ideal POD range are wall mounted, electronically controlled,
Heat Interface Units (HIU) whose energy is provided from district
or community-based heating systems. Examples of central plant
systems include centralised HIUs, district heating or central
energy systems using renewable or hybrid energy sources.
HIUs provide accurately controlled heating and hot water delivery
to meet the user’s demands. These units are available with
indirect domestic hot water and central heating (Indirect range) or
with indirect domestic hot water and direct central heating (Direct
range) formats.
INDIRECT RANGE
•
Ideal POD i305 = 30kW DHW output with 5kW indirect CH
output performance
•
Ideal POD i405 = 40kW DHW output with 5kW indirect CH
output performance
•
Ideal POD i505 = 50kW DHW output with 5kW indirect CH
output performance
•
Ideal POD i605 = 60kW DHW output with 5kW indirect CH
output performance
•
Ideal POD i705 = 70kW DHW output with 5kW indirect CH
output performance
DIRECT RANGE
•
Ideal POD D30 = 30kW DHW output with direct CH output
performance
•
Ideal POD D40 = 40kW DHW output with direct CH output
performance
•
Ideal POD D50 = 50kW DHW output with direct CH output
performance
•
Ideal POD D60 = 60kW DHW output with direct CH output
performance
The HIU is supplied fully assembled, incorporating electronic
controls, Primary Pressure Independent Control Valves (PICV), a
Domestic Hot Water (DHW) Plate Heat Exchanger (PHE), shock
arrestor, strainer, control turbine and thermistors.
Indirect units have an additional circulating pump, pressure
gauge, safety valve and Central Heating (CH) expansion vessel.
The HIU is provided with a fully insulated heat transfer section
reducing heat loss with an isolation connection manifold and CH
filling loop (Indirect only).
User Features
User controls allow the required temperatures to be selected for
hot water and for heating.
The HIU features a DHW Preheat facility, frost protection, daily
pump and PICV exercise.
Installer Features
•
Primary return temperature limiting
- this feature is
intended to be used by commissioning engineers and
restricts the return temperature on the primary by not opening
the PICV to allow any more heat energy than that required
to deliver the pre-set primary return temperature. This may
reduce available output and ensures the heat network system
meets its design efficiency requirement.
•
Concrete slab drying
- this facility allows the HIU to be
operated at a low temperature suitable to assist the drying of
a concrete floor where under-floor heating is installed without
causing cracking.
•
PICV (s) anti seize function
- If the PICV has not operated
in a 24 hour period the control will operate the valve briefly to
prevent the valve from becoming stuck in position.
•
Construction
- the HIU casing and front door is of white
painted mild steel, the user controls are located behind the
lower hinged door. The internal control panel is polymer-
based construction. There is provision to fit an optional heat
meter to record the energy consumption.
•
All the internal plate heat exchangers are stainless steel.
•
The central heating circuit for all models is suitable for
connection to fully pumped, sealed heating systems ONLY.
•
Adequate arrangements for completely draining the system
by provision of drain cocks MUST be provided in the
installation pipework.
•
Pipework from the HIU can be routed upwards or
downwards.
•
The HIU has a separate isolation valve connection system
and filling loop (Indirect only) that must be fitted prior to HIU
installation.
•
Additional kits are available to aid system flushing and filling.
•
Be sure to follow Ideal installation and maintenance guide for
correct method of installation.
Data Plate
The HIU model, serial number and other key operational data
can be found on the data plate that is located inside the left-hand
side panel of the case.
1.2 OPERATION
The HIU operates on DHW priority. During a CH demand period
if a DHW demand is detected the HIU will deliver the required
DHW, returning to CH mode only when the DHW demand ends.
The HIU has a DHW pre-heat function for a faster response
to demand for hot water. This only operates if the “PREHEAT”
function is selected and the display reads “HOT WATER
PREHEAT ON”.
The delivery temperature of the DHW is controlled by the PICV.
This controls the flow of the primary water to the DHW plate heat
exchanger delivering the required temperature as set on the user
control.
When there is a demand for CH, the heating system is supplied
at the selected temperature of between 30°C and 80°C, until the
CH demand is deactivated or there is a DHW demand. The flow
temperature to the heating system is controlled by the heating
circuit PICV. This controls the flow of the primary water to the
central heating plate heat exchanger delivering the required
temperature as set on the user control.
For DHW draw off data please reference the performance tables
in Table 2.
The DHW draw off rate specified in Table 2 is the nominal that
the HIU flow regulator will supply. Due to system variations and
seasonal temperature fluctuations DHW flow rates/temperature
rise will vary, requiring adjustment at the draw off tap.
At low DHW draw-off rates the maximum temperature may
temporarily exceed 65ºC (i.e. for a period of less than 10
seconds).
The HIU features a comprehensive diagnostic system which
gives detailed information on the operational status, and
performance of key components to aid commissioning and fault
finding.
