Grant Aerona 3 HPID10R32, Instructions Manual, Page: 27 / 100

Section 6: Electrical Page 27
Project Title: Aerona³ ASHP - Extended S-Plan for digital thermostats
with
Hot
Water
Priority
Relay
Aerona³ Wiring Schematics
HPWS0007
Drawing Set: Status: Approved Rev Date: 15/09/20
Drawn By: CGC
Checked By: PS
Dwg. No. Revision: 1.0
This drawing and its content is subject to copyright. Use other than for its original intended purpose must be arranged with an
employee of
Grant UK Ltd.
Hopton House, Hopton Industrial Estate, Devizes, Wiltshire, SN10 2EU, tel; 01380 736920
Scale: NTS Paper Size: A4
Notes: Some neutral and earth connections have been excluded for clarity.
3 2 1
1 2 3 4
RL1
RL2
RL3
DHW
N
P
CH
Grant EP002 Heat Pump Interface
ASHP Terminals
1
2
3
4
5 6 7 8
17 18 19
20 21 22 23 24 25
Link
Heat Pump
1 2 3 4 5 6 7 8 9 10
11 12
5A
L N E
240V 50HZ
DHW Timer
Digital Stat 1 Digital Stat 2
Hot Water
Priority Relay
(HPWPR1)
A1
A2
1
2
3
4
N
Brown Blue
Green/Yellow
Motor
HTG 1
2-Port Zone Valve
Brown Blue
Green/Yellow
Motor
HTG 2
2-Port Zone Valve
Brown Blue
Green/Yellow
Motor
DHW
2-Port Zone Valve
Orange
Orange
Orange
Grey
Grey
Grey
Common (red) Hot Water (yellow) Heating (blue)
Wiring Centre
Overheat
Stat
1 C 2
Control
Stat
1 C 2
Link
N
E
E
Dual Thermostat
4 Core ( 3 + E ) Volt free connections from
Heating and Hot Water zone
valves to terminals 18 - 20 on ASHP terminal PCB via relays
on Grant EP002
6.12 SYSTEM CONTROL WIRING DIAGRAM
The control system shown in this diagram includes the Grant hot water priority relay (product code: HPWPR1). This ensures that there can be no demand for space heating and hot water at the same time. Any demand from the DHW timer and cylinder thermostat for hot water will activate the relay
, immediately interrupting any heating demand from the
programmable room stats. This will remain interrupted until the demand for hot water stops - either the cylinder thermostat is satisfied or there is no output from the DHW timer
.
Terminals
19
Hot water
20
Heating
18 and 21
Common
Figure
6-5:
S-plan plus system connection
diagram
! NOTE
!
This volt free remote contact is provided by the Grant EP002 Interface relay box. Refer to Section 6.8.
! NOTE
!
Some Neutral and Earth connections have been excluded for clarity
.