Install Instructions

7 Domestic water heaters (continued)
55
Installation & Service Manual
Minimum Pump Performance
Based on heating potable water with a hardness of 5 to 20
grains per gallon and total dissolved solids not exceeding
350 ppm. See “Water Chemistry”, page 49.
EXTERNAL SENSOR FOR TANK, SYSTEM OR PUMP DELAY
REMOTE SENSOR CONNECTOR IS
LOCATED ON SIDE OF UNIT.
NOTE: COLOR OF WIRES AND
LEAD STYLES MAY VARY
WITH SENSOR PROVIDED.
CONNECTIONS ARE POLARITY
INSENSITIVE.
SIDE PANEL
Figure 7-4_External Sensor for Tank, System or Pump
Delay
Heat Exchanger
On all mod els, header inspection plugs can be removed for
field in spec tion and cleaning of copper tubes. The entire heat
exchanger may be easily removed from the unit.
Thermostat Settings
1. The thermostat is adjusted to a low test set ting when
shipped from the factory.
2. Set the thermostat to a maximum water temperature of
125°F which will satisfy hot water demands and prevent
risk of scald injury.
Households with small children or invalids may
require 120°F or lower temperature setting to re duce
risk of scald in ju ry. Some states may require a lower
temperature setting. Check with your gas supplier for local
re quire ments governing the tem per a ture setting. Re mem-
ber, no water heating sys tem will provide exact tem-
per a ture at all times. Allow a few days of operation at
this setting to de ter mine the correct temperature set ting
consistent with your needs.
NOTICE
(1) This water heater, when set at the
low er temperature setting, is not capable
of producing hot water of sufficient
temperature for sanitizing pur pos es.
(2) Higher stored water temperature
in creas es the ability of the water heater
to supply desired quantities of hot water,
however remember:
⚠ CAUTION
Hotter water increases the risk of scald
injury.
Incorrect piping of the cold water supply to the sys tem
may result in excessive low temperature op er a tion causing
condensate formation on the heat ex chang er and operational
problems. The cold water supply piping must be installed in
the dis charge piping from the heater to the storage tank. This
allows the cold water to be tempered in the storage tank before
entering the heater. See typ i cal installation drawings provided
in this manual. Higher wa ter temperatures reduce condensate
formation.
TABLE 7C
Water Heater Pump Applications
Model
Pipe
Size
Water
Hardness
Grundfos
Pump
Flow
Rate
(GPM)
Head
Loss
(FT)
Temp.
Rise
90,000
2"
5 to 15 gpg TP45PAB 30 8 5°F
15 to 20 gpg UPS 43-100 SF 38 8 4°F
135,000 2"
5 to 15 gpg TP45PAB 30 8 7°F
15 to 20 gpg UPS 43-100 SF 38 8 6°F
180,000 2"
5 to 15 gpg TP45PAB 30 8 10°F
15 to 20 gpg UPS 43-100 SF 38 8 8°F
199,000 2"
5 to 15 gpg TP45PAB 30 8 9°F
15 to 20 gpg UPS 43-100 SF 38 8 7°F
225,000 2"
5 to 15 gpg TP45PAB 30 8 12°F
15 to 20 gpg UPS 43-100 SF 38 8 10°F
270,000
2"
5 to 15 gpg TP45PAB 30 8 15°F
15 to 20 gpg UPS 43-100 SF 38 8 12°F
315,000
2"
5 to 15 gpg TP45PAB 30 8 17°F
15 to 20 gpg UPS 43-100 SF 38 8 14°F
360,000
2"
5 to 15 gpg TP45PAB 30 8 20°F
15 to 20 gpg UPS 43-100 SF 38 8 16°F
399,000 2"
5 to 15 gpg TP45PAB 30 8 22°F
15 to 20 gpg UPS 43-100 SF 38 8 17°F
500,000 2"
5 to 15 gpg TP45PAB 30 8 28°F
15 to 20 gpg UPS 43-100 SF 38 8 22°F
Remote Sensor Installation
Water heaters are provided with an extra temperature sensor
that MUST BE field installed. The sensor is shipped loose in
the I & O packet. This remote mounted sensor will be the
primary temperature sensor which will inform the appliance’s
built-in thermostat control. For domestic water heating, the
sensor MUST BE installed into a bulbwell on the storage tank.
This is required to maintain the desired temperature in the
tank and reduce cycling of the heater.
The sensor must also be connected to two blue wires provided
in the upper left-hand corner of the control panel. It will be
necessary to add additional wire to reach from the appliance
to the remote water source. Use twisted pair wire, minimum
18 gauge or larger. See Table 5A, page 35 regarding distance
versus wire gauge.