Eternal GU145 Series, Installation And Operation Manual

Page: 31 / 54

31
Temperature and Pressure Relief Valve
The temperature-pressure relief valve should be manually opened once a year.
No one should be in front of or around the outlet of the temperature-pressure relief valve discharge line when in use.
If after manually opening the valve and it fails to completely reset and continues to release water, immediately
close the cold water inlet to the water heater, follow the draining instructions, and replace the temperature-
pressure relief valve with a new one. The discharge capacity must be at least 199,000 BTU/HR for
GU195(S,M), 145,000 BTU/HR for GU145(S).
□
□
□
Troubleshooting Thermal Expansion
If a water heater is installed in closed water supply system, such as one having a backflow preventer in the cold
water supply line and a thermal expansion tank is required, contact the water supplier or local plumbing inspector
on how to control this situation.
The following 3/4", maximum 150psi valves are approved by CSA for use with GU145(S) / GU195(S,M) :
- Cash Acme NCLX-5L
CAUTION
! !
Recirculation Pump Connection
Step 2. Set "Pump intermittent time" by selection #2, #3
switch of group 2 like below
 gure.
After each  ring cycle, IPC temporarily stops power supply
to the pump during intermittent time limited by dipswitch,
and starts pump again after set OFF time interval.
IPC employs a different ignition logic compared to when
Eternal is on recirculation without IPC. Normally, set
at 140
° F, Eternal will  re if the inlet thermistor detects
return line temperature drop to 129 ° F. However, with
IPC engaged the logic changes, Eternal will  re if the
return line water temperature is 106 ° F.
□
How To Activate Internal Pump Control Function
Step 1. Push #1 switch of group 2 like below  gure.
□
Step 1.
Unplug power cord of unit.
Step 2.
Make the hole on right side of panel and get rid of burr.
Step 3.
Insert the pump plug to the hole on right side of panel.
Step 4.
Insert the pump plug to the pump socket inside of unit.
Eternal has an Internal Pump Control (IPC) that can be
optionally enabled to provide enhanced ef
 ciencies. The
IPC is easy to use and factory con  gured as a 3-pronged
outlet for recirculation pumps utilizing less than 2A.
Feature and Benefits
□
Recirculation Pump Connection
Eliminates the need to buy a separate pump or
aquastat as the pump is controlled by the unit
’ s main
controller.
Improves gas consumption as the recirculation is no
longer run 24/7 unnecessarily.
Improved heat exchanger life as the control prevents
rapid on/off
 ring cycles.
□
□
CAUTION
!
If pump needs more than 2 amps, put additional relay
between pump socket and pump like  gure.
!
!
WARNING
!
Additional Relay
From unit pump socket
coil
AC power source
To Recirculation pump
NOTICE
!
When setting high tempeature to 180 ° F for sanitation
purpose, we recommend using Aquastat control in
the recirculation system instead of using Internal
Pump Control because IPC mode can ’ t maintain the
temperature to 180 ° F constantly.
!
If the inlet thermistor detects incoming water exceeding
149 ° F, the unit will lock down and not  re up despite
sensing demand until it is reset by powering off then
on. In such cases, an aquastat should be used to
control the pump to make sure that the recirculation
loop does not exceed 149 ° F.Use a thermostatic mixing
valve to limit inlet temperature if heated water will
be passing through Eternal ’ s inlet at temperatures
exceeding 149 ° F.
Applicable Models:
GU145(S) / 508(11,12,21,22)1145(S)
GU195(S) / 508(11,12,21,22)1195(S)
Description: