temperzone 40Y Ducted Fan Coil Units Installation Guide

temperzone 40Y Ducted Fan Coil Units

Specifications

• Models: IMDL 40Y, IMDL 60Y, IMDL 90Y, IMDL 130Y (with EC motor)
• Type: Ducted Fan Coil Units
• Dimensions (mm): Refer to Fig. 1 and model-specific dimensions
• Water Connections: BSP Male
• Supply Air Spigots: Refer to Fig. 2 for optional spigots
• Manufacturer Note: Specifications subject to change without notice

FAQs

• Q: Can I use insulated flexible hoses with the IMDL units?
  • A: Yes, you can use insulated flexible hoses to meet local building regulations. Ensure proper insulation for the hoses.
• Q: How should I position the IMDL units for optimal performance?
  • A: Position the units close to the conditioned space, allowing space for maintenance and proper drainage. Ensure level installation for efficient operation.

Dimensions

Fig. 1 Dimensions (mm)

Note:

1. Allow adequate clearance for the filter (if fitted) to be removed.
2. IMDL 130 has two half-length filters, 2 motors, and 3 fans.
3. Left-handed models have drain exits nearer the supply air side.

NOTE: The manufacturer reserves the right to change specifications at any time without notice or obligation. Certified dimensions available on request.

Fig. 2 Optional Supply Air Spigots

Installation & Maintenance

GENERAL: The IMDL-Y ducted fan coil units must be installed by all national and local safety codes.

Optional

1. Supply air spigot adaptors (refer to Fig.2).
2. Flexible hoses (uninsulated):
   • 13 BSP (1/2″) part no. 060-000-270
   • 20 BSP (3/4″) part no. 060-000-271
   • 25 BSP (1″) part no. 060-000-272.
3. Electric heater elements (factory fitted).

INSTALLATION Positioning & Mounting

• IMDL units are designed to be used with simple, short duct layouts. Units should be located as close to the space to be air-conditioned as acoustic criteria allow.
• When determining the position of the unit, allow adequate space around the unit to facilitate water pipe/hose connections, future servicing, and maintenance. Ensure there is enough working space in front of the electrical access panel.
• Allow adequate clearance for the filter to be withdrawn to its full length from either end of the unit. Alternatively, the filter may be lifted out of its track.
• Provision should be made for access to remove the unit from the ceiling if the need arises.
• Left-handed models have drain exits on the supply air side of the drain tray.
• Install the unit suspended on threaded rods or bolts and locking nuts (not supplied). Alternatively, mount each unit on vibration isolators on a suitable platform.
• The unit must be installed level. Use the adjustable support bracket (see Figure 3) to lower the drain pipe outlet and provide a slope in the drain tray.

WATER SUPPLY & RETURN

• The IMDL unit’s IN and OUT water connections are male pipe threaded (refer to Fig. 1). Warning: overtightening of connections to the main water supply may damage the unit.
• It is recommended you use two temper zone 600 mm flexible high-pressure water hoses. These have female pipe threaded connections at each end. The maximum water pressure for each hose is 1720 kPa (250 psi).
• The IMDL unit alone, excluding hoses, will withstand 4480 kPa (650 psi). Hoses may need to be insulated to meet local building regulations.
• Poor quality water supply must be pre-filtered and adequate water treatment must be maintained, particularly where open cooling towers are used.

Condensate Drain

• The drain should have a slope of at least 1 in 50 and must not be piped to a level above the unit drain tray. Fit a vent pipe within 500 mm of the unit (see below).
• Use flexible tube to connect the unit’s drain stub to the external drain pipe.
• Check the drain by pouring water into the drain tray and ensuring that it clears.

ELECTRICAL WIRING

• Electrical work must be carried out by a qualified electrician according to local supply authority regulations and the wiring diagram.
• The electrical supply required is 1 phase 220–240V a.c. 50Hz with neutral and earth. A lockable motor-rated isolator switch shall be fitted as close as possible to the unit. Refer to wiring diagrams for max. operating current.
• Wire the unit directly from the electrical distribution board. The unit shall have its dedicated circuit breaker on the Distribution Board.
• Units with Electric Heat: A 24V AC externally sourced power connection is required to control the optional electric heater elements via the solid state relay (SSR); refer wiring diagram (page 4).

FAN CONTROL Overview

The fan can be controlled between selectable low and high levels using either:

1. 0–10V DC control voltage (ie continuously variable), or
2. (up to) 3 contact inputs (ie stepped).
   • Only one control method must be connected at any one time; not both.
   • Fan run-on is provided with durations suiting water-sourced and electric heating systems.
   • Control Levels (Output Voltages)
   • DIP switches 1-4 of the Analog Level Controller (ALC on wiring schematics) select the low fan control voltage level. DIP switches 5 and 6 select the high fan control voltage level as a set amount above the low level.
   • The medium-level setting is halfway between the low and high setting levels.
   • The control voltage settings apply to both 0-10V and contact input control levels.
   • Refer to the wiring schematic diagram for the default settings and the available level settings.

Contact Inputs

• Voltage-free contact inputs can be used to operate the fan at the selected control levels.

0-10V Input

• A 0–10V DC signal can be used to control the fan. The fan is stopped for input signals below 1.6V. The fan operates at the selected low level when the input signal is between 1.6 and 2.0V. As the input signal increases above 2V the fan control signal increases linearly reaching the selected high level when the input signal is 10V.
• Note: Minimum control voltage is 4V for units with electric heat.

Run-On

• The run-on duration is selected with DIP switch 8 for either 40 seconds or 120 seconds for electric heating systems. If electric heating is fitted ensure DIP switch 8 is set on for 120 seconds run-on.
• The fan will run on for the selected period when the 0–10V input falls below 1.6V and all the contact inputs are opened. If the 0–10V input signal remains below 1.6V and the contact inputs remain open the fan will stop at the end of the run-on period.
• Note: Select fan control levels that avoid water carry-over problems.

ELECTRIC HEAT (Option)

• Units installed with electric heat elements include both auto (90°C) and manual (120°C) high temp. safety thermostats.
• If the manual high temp. safety t/stat requires resetting and the auto high temp.
• Safety t/stat does not reset, then the latter needs to be replaced.
• Note: The minimum control voltage is raised to 4V to ensure adequate heat dissipation from the electric elements.

COMMISSIONING

1. Check that the thermostat is correctly wired and set at the desired temperature.
2. Check that the air filter is clean.
3. Check that the fan runs freely without vibration.
4. Check the condensate drain for free drainage.

MAINTENANCE Weekly For First Four Weeks

1. Check the air filter; vacuum clean as necessary.
2. Check the condensate drain for free drainage.

Monthly

• Check air filter; vacuum clean as necessary.

Six Monthly

1. Check the condensate drain for free drainage.
2. Check the heat exchanger coil; vacuum or brush clean as necessary.
3. Check the tightness of the fan.
4. Check that fan motor is free running.
5. Check the tightness of electrical connections.
6. Check air supply at diffuser outlets.

NOTE

• The manufacturer reserves the right to change specifications at any time without notice or obligation. Certified dimensions are available on request.
• This pamphlet replaces the previous issue no. 3794 dated 04/22. Flexible drain connection.

Standard Unit

Standard Unit c/w Electric Heat & SSR

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