The Grundfos IMpress Pressurisation Sets are designed for the pressurisation of sealed heating and chilled water systems. The range includes Basic, Advanced, Glycol, and H/C (Hot/Cold) units, all designed to be compact, reliable, and simple to use, providing many years of efficient and effective service.
Function Description:
The primary function of the IMpress units is to maintain the required pressure within sealed heating and chilled water systems. This is achieved through integrated pumps that activate when the system pressure drops below a set differential, and deactivate once the set pressure is reached. The units are equipped with a microprocessor controller that manages pump operation, monitors system parameters, and provides diagnostic information.
The IMpress Advanced, Glycol, and H/C models offer enhanced features, including expanded cable entry facilities for additional alarm, BMS/Telemetry, and communications features. The Glycol version is specifically designed for systems using glycol, indicated by a snowflake decal on the control panel and additional M16 cable glands. The H/C (Twin) version is designed for systems with both hot and cold circuits, featuring a two-colour control panel decal (red & blue) and two transducer cables, one for each circuit. Both transducers must be connected for the H/C unit to operate correctly, otherwise, a system failure condition will occur.
Important Technical Specifications:
- Liquid Temperature Range: 3 to +90°C
- Ambient Temperature: Up to +40°C
- Relative Humidity: Up to 95%
- Maximum Operating Pressure: 6 Bar (for Basic, Advanced, Glycol)
- Recommended Maximum Start-Stops per Hour: 20 - 30
- Electrical Supply: 240 volt single phase 13 amp supply (approximately 4m mains supply cable provided)
- Volt Free Contacts (VFC) Rating: Maximum 240V AC 10A (Resistive)
- Pipework Connections:
- Water supply connection: ½" BSP Male
- Overflow pipe: ¾" BSP Male
- System connection: 15mm Compression (Basic, Advanced), 22mm Compression (Glycol, H/C)
- Noise Level: Lower than limiting values stated in the EEC machinery directive.
- Dimensions and Weights (Examples from Product Data):
- IMpress MIMS 2301 (1 pump): 25 Kgs
- IMpress DIMS 2301 (2 pump): 35 Kgs
- IMpress Glycol MIGA2301 (1 pump): 37 Kgs
- IMpress Glycol DIGA2301 (2 pump): 47 Kgs
- IMpress H/C MITA2301 (1 pump per circuit): 54 Kgs
- IMpress H/C DITA2301 (2 pumps per circuit): 67 Kgs
Usage Features:
- Digital Display (LCD): Shows current operational status and error conditions.
- Panel Buttons:
- DOWN Button: Decreases displayed values in Set-Up/Menu Mode.
- UP (Mute) Button: Toggles Alarm Beeper On/Off in Normal Mode; increases displayed values in Set-Up/Menu Mode.
- SET (Set-Up/Menu) Button: Enters Set-Up/Menu Mode from Normal Mode; saves displayed values and progresses to the next item in Set-Up Mode.
- Status LED: Displays GREEN for normal operation, flashes RED for alarm conditions.
- Set-Up/Menu Mode: Accessed by pressing SET and entering a 4-digit PIN (factory default: 0000). Allows configuration of various parameters.
- Configurable Parameters:
- Set Pressure: Cold fill cut-out pressure (0.5 to 16 bars, default 1.5 bars).
- Pump A/B Control: OFF (disabled), Auto (available for operation), ON (manual run for ~30 seconds).
- Differential: Pressure at which a pump engages below Set Pressure (0 to 16 bars, default 0.3 bars).
- Pump Test: Prevents pump seizing by briefly running if inactive for a set number of hours (0 to 250 hours, 0 disables).
- P- Low Alarm On/Off: Pressures for low-pressure alarm activation/deactivation (0 to 25 bar, default On=1 bar, Off=1.3 bar).
- P-High Alarm On/Off: Pressures for high-pressure alarm activation/deactivation (0 to 25 bar, default On=2.5 bar, Off=2.2 bar).
- Water- Low Alarm: Set to "Alarm on Make."
- Water- Low Reset: Time until pumps can operate after a Water-Low Alarm (0-255 seconds, default 120 seconds).
- Leak Alarm: Triggers if pumps run for cumulative preset time in any hour (0 to 59 minutes, 0 disables).
- Volt Free Relay: Configures conditions for relay operation, including Failsafe option.
- Beeper / Alarm LED: Configures conditions for audible beeper and alarm LED, including keypress sound.
- LED Contrast / LCD Backlight: Adjusts display contrast (0-6, default 2) and backlight level (0-5, default 2).
- Standby Mode: Determines if the unit enters Standby Mode on Power-On (Yes/No).
- User PIN: Sets the password for Set-Up mode (4 characters, default 0000).
- Fault Finding: The unit provides various fault indications on the display, including Pressure High/Low, Pump Faults, Sensor Error, Service Due, System Failure, System Lock, Water Leak, Water Low, and Water Refilling.
Maintenance Features:
- Minimum Maintenance Design: Grundfos pressurisation units are designed for minimal maintenance.
- Regular Inspections: Recommended to inspect the unit regularly for leaks, quiet and smooth operation, corrosion, and damage to the electrical mains lead.
- No User Serviceable Parts: Users are advised that there are no user-serviceable parts inside the equipment, and servicing should be referred to qualified personnel.
- Warranty: Covers defects from faulty workmanship and/or materials for one year from installation or eighteen months from dispatch, whichever is sooner. Dismantling faulty equipment or incorrect installation can invalidate the warranty.
- Service Due Alarm: The unit can indicate when service is due, prompting an engineer visit.
- Pump Test Feature: Helps prevent pumps from seizing due to inactivity.
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