13
®
Heat
Link
www.heatlink.com
HEP025RT
Installation, Operation, and Maintenance Manual
L6HEP025RT
Panel Control Sequence
Transformer
Plug In
Primary
Ground
120VAC
BK
WH
RED
BK
WH
TIMER
3
4
2
1
5
R C W
CONTACTS
AUX
1
7
4
10
11
Secondary Pump
2
8
5
Primary Pump
SWITCH
FLOW
3
9
6
RELAY 2
RELAY 1
RELAY 1 = OMRON LY3-AC24 3PDT 24VAC
RELAY 2 = OMRON G2R-1-S(S) 24VAC
BASE = OMRON PTF11A
BASE = OMRON P2RF-05-PU, 0291EW
1.
When the power cord
1
and transformer
2
are plugged in, the panel will be able to operate
properly.
2
. The timer
3
activates the primary pump for 15 minutes every 24 hours to ensure that potable
water in the piping is not stagnant.
3.
When a thermostat calls for heat, its internal 24V contacts close, the relays close, and both pumps
4
turn on.
4.
When the requirements of the thermostat are met, the internal contacts of the thermostat open, the
auxiliary contacts open, and the pumps stop.
Note:
If the FLWSWTCH optional DHW priority flow switch
5
is installed and the DHW flow is above the
factory setting for this device, the primary pump stops. When the DHW flow drops below the factory setting
the panel resumes normal operation.
1
2
3
4
5
The HEP025RT features a timer which will activate the pump in order to circulate water within the
system for 15 minutes every 24 hours. This prevents stale water from accumulating in an open
system during periods of low heat demand (ie. summer).
It is recommended that any HEP025RT installed in an open system remain plugged in (with the
thermostat on low during summer periods) in order to allow the timer to activate this circulation.
If the HEP025RT is installed in a closed system it can be unplugged during these periods.
The timer is set at the manufacturing facility for this function, and should not be altered.
See insert for detailed Timer instructions.
24hr Timer
