Superheat Calculation; Braze Plate Cleaning Instructions - Lochinvar MHP0270 User's Information Manual

SUPERHEAT CALCULATION

1. Measure and record the suction pressure at the
suction line pressure access port inside the unit.
2. Convert the recorded suction pressure to saturated
temperature.
3. Measure the suction line temperature near the suction
line pressure access port inside the unit.
4. Compare the suction line temperature to the saturated
temperature in Table 10.
5. The diff erence between saturated temperature and
suction line temperature is the superheat. Superheat
normal range should be 8°F to 12°F (4.4°C to 6.7°C)

BRAZE PLATE CLEANING INSTRUCTIONS

In some applications the heat exchanger may be subjected
to severe fl uid conditions, including high temperature hard
water conditions, causing accelerated scaling and corrosion
rates, and will diminish performance.
It is important to establish regular cleaning schedules, A 5%
solution of Phosphoric Acid or Oxalic Acid may be considered.
Other types of solutions can be obtained from your local
wholesaler. Make sure cleaning solution is applicable for stainless
steel and copper and all directions are followed.
Do not heat solution. Be sure to fl ush heat exchanger with
fresh water after cleaning. See Figure 12.
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TABLE 10
FIGURE 12