Whirlpool Indirect-Fired Water Heater - Manual (Page 10)

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Example No.1: A Peerless Partner PP-40 with a Peerless MI-03 gas boiler (DOE Heating Capacity of 58 Mbh).
The desired water temperature is 115°F. Cold water temperature is 55°F.
4. Water Temperature Too Hot
a. Peerless Partner thermostat set too high. Adjust to lower setting.
b. System piping and/or controls.
* Peerless Partner thermostat continues to call for heat after reaching setpoint. Replace thermostat.
* Check system piping and flow control valve. Verify space heating call for heat does not cause flow through Peerless
Partner heat exchanger.
c. Mixing Valve (if used). Verify proper operation per manufacturer’s instructions.
5. Leaking Temperature and Pressure Relief Valve
a. Water expands when heated.
* Install thermal expansion tank on cold water inlet.
* Reduce Peerless Partner thermostat setting.
b. Water temperature too high. See Paragraph 4 above.
c. Water pressure is too high. Install pressure reducing valve on cold water inlet.
d. Valve seat has deteriorated or has sediment build-up. Replace temperature and pressure relief valve.
Example No. 2: A Peerless Partner PP-120 with a Peerless LC-04 (Gross I=B=R Output of 547 Mbh). The
desired water temperature is 150°F. Cold water temperature is 50°F.
Btu
Tank Capacity [gallons] x Temperature Rise [°F] x 8.33 -----------------------------
(gallons)(°F) minutes
Recovery Time [Minutes] = ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- x 60 -------------------------
Btu hr
Boiler Output -------------- *
hr
Btu
(37 gallons) x (115°F-55°F) x 8.33 -----------------------------
(gallons)(°F) minutes
Recovery time = --------------------------------------------------------------------------------------------------------------------------------------------- x 60 ------------------------- = 19.1 minutes
Btu hr
58,000 --------------
hr
Btu
(119 gallons) x (150°F-50°F) x 8.33 -----------------------------
(gallons)(°F) minutes
Recovery time = ----------------------------------------------------------------------------------------------------------------------------------------- x 60 ------------------------- = 19.8 minutes
Btu hr
300,000 --------------
hr
v. Water temperature will remain constant within ±5°F until storage is exhausted. Continue to fill container
until temperature drops 10°F.
vi. Compare total volume of water collected to Usable Hot Water in Table 1. If within 5 gallons the Peerless
Partner is operating properly. Check PRODUCT SELECTION for proper model usage.
vii. Compare calculated flow rate with first draw usage available per Table 3. If actual flow rate is greater
than first draw usage available, consider use of flow restricting fixtures or mixing valve.
b. Inadequate boiler water flow. Check circulator sizing per PIPING.
c. Boiler is undersized.
3. Slow Recovery.
See 2(b)(c) above. Approximate cold start recovery period (* use Minimum Boiler Output from Table 1 or
Boiler Rated Output, whichever is smaller):