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8.7 Indirect Storage Tank
Boiler GMHB125 can be electrically connected to indirect
storage tank as follows:
• Connect DHW priority sensor
9-10 on terminal block M2.
10k Ω
• Insert
NTC sensor element in the sensor well of
indirect storage tank.
• Verify exchange capacity of the storage boiler coil is
appropriate for boiler power.
• Adjust DHW temperature +95 °F...+140 °F (+35
°C...+60 °C) by rotating left knob on boiler Control.
IMPORTANT: set parameter P03 as described in:
"PARAMETER SETTINGS".
A
Heating system
B
Three way diverter valve
C
Heating water flow
D
Heating supply to DHW indirect storage tank coil
E
Heating water return
F
Tank
G
Optional DHW priority sensor tank
1K Ω Outdoor Reset Sensor
8 - ELECTRICAL CONNECTIONS
10k Ω
NTC to terminals
BOILER CONTROL
Zone Control
T-Stat
Sensors supplied with this boiler are
Note
proprietary to the manufacturer. Use of
alternate sensors WILL diminish boiler
performance.
Use of Indirect Storage Tank (DHW):
10k Ω
☐ Use either
to interface with boiler. Wire to M2 terminals #9 and #10.
☐ Use of booster pump to increase flow rate to indirect tank
is not recommended by manufacturer. (125 only)
☐ Locate tank as close to boiler as possible.
☐ Size DHW tank, piping, and system to use only internal
boiler pump.
☐ Change P03 on boiler for application as specified on the
wire diagram and Boiler Control section of Installation,
Operation & Maintenance Manual supplied with the boiler.
DO NOT
USE
10k Ω DHW
Indirect Tank
Sensor
or
DHW Indirect
Tank Aquastat
(Heating Only
Boilers
47
DHW sensor or Indirect Tank Thermostat
PN 240012363 REV. A [08/31/2018]
SUPPLY Cord
120V/60HZ
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