Danfoss FP975 Installation guide

MAKING MODERN LIVING POSSIBLE

Danfoss Heating

FP975

7-Day Electronic Programmer

Installation Guide

For a large print version of these instructions
please call Marketing on 0845 121 7400.

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FP975

Installation Instructions

FP975

7 Day Electronic Programmer

GB

Index

1.0 Installation Guide .....................................................................................4

2.0 System Overview .......................................................................................4

3.0 Installation ...................................................................................................4

3.1 DIL Switch Settings ...........................................................................4

3.2 New Installations................................................................................5

3.3 Existing Installations .........................................................................8

3.4 Wiring .....................................................................................................9

3.5 230 Vac Fully Pumped System - Zone Valves ...........................9

3.6 230 Vac Controlled Gravity Hot Water .....................................10

3.7 230 Vac Fully Pumped System - Mid-Position Valves ......... 10

3.8 Wiring Conversions ........................................................................ 11

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GB

1.0 Installation Guide

Please Note:

This product should only be installed by a qualifi ed electrician or
competent heating installer and should be in accordance with the
current edition of the IEEE wiring regulations.

2.0 System Overview

Specifi cation

Power supply 230 Vac ± 15%, 50/60 Hz

Switching action

2 x SPDT voltage free, Type 1B

Switch rating 10-230 Vac, 3(1)A

Battery back-up 24 hours minimum

Timing Accuracy ±1 min/month

Setting/Running Accuracy ±1 minute

Max. Ambient Temperature 45°C

Dimensions, mm (W, H, D) 148 x 96 x 42

Design standard EN 60730-2-7

Control Pollution Situation Degree 2

Rated Impulse Voltage 2.5kV

Ball Pressure Test 75°C

3.0 Installation

3.1 DIL Switch Settings

S

Before mounting the unit, ensure the 4 DIL switches on the rear of
the unit have been moved to the required settings.

TOP

24 HR

7 DAY/24 HR

PUMPED

MK.9

LEFT

5/2 DAY

SET

GRAVITY

4

7 DAY

RIGHT

FP975

MK.9 or SET
The FP975 is supplied fi tted with a Danfoss Randall SET wallplate.
However the FP975 will also mount directly onto a Danfoss Randall
MK.9 wallplate without the need for wiring changes. However when
used with existing MK.9 wallplates the left hand switch must be set
in the MK.9 position to re-confi gure the time control to match MK.9
wiring connections.

PUMPED or GRAVITY

When this switch is in the PUMPED position the Heating and Water
outputs are UNLINKED. When in the GRAVITY position the Water
output is LINKED to the Heating output so that whenever the
Heating is ON the Water will also be ON regardless of the Water
programme.

Place the switch in the PUMPED position if the system being
controlled is a) fully pumped with a mid-position valve, b) fully
pumped with a two port zone valve in each circuit, c) GRAVITY
Hot Water, PUMPED Heating with a two port zone valve with SPDT
auxiliary switch in the gravity primary circuit (and wired in accordance
with diagrams on pages 9-10).

GB

Place the switch in the GRAVITY position if the system being
controlled is a) fully pumped, but with only a single two port zone
valve in the Heating circuit, b) GRAVITY Hot Water, PUMPED Heating
with no zone valves.

7 Day, 5/2 Day or 24 Hour

When both switches are in the 7 DAY position each day of the
week may be programmed with diff erent ON/OFF times. When the
switch is in the 5 DAY/2 DAY position, weekdays (Mon-Fri) can be
programmed with one set of ON/OFF times, and weekends (Sat-Sun)
can be programmed with a diff erent set. When both switches are in
the 24 hour position the same set of times will be repeated in every
24 hour period.

3.2 New Installation

1. Fix the wallplate to the wall or plaster box as required.
When fi xing the wallplate note that the terminals are at the top,

and the vertical centre line of the unit lies between terminals N
and L.

2. Surface cables can only enter from below the unit. If mounted on
a plaster box, cables can enter from the rear through the aperture
in the wallplate.

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