Raypak MVB 5042004 User Manual

Page 18

Pool/Spa Water Chemistry

Chemical imbalance can cause severe damage to the

pool heater and associated equipment. Maintain the

water chemistry according to the chart below. If the

mineral content and dissolved solids in the water

become too high, scale forms inside the heat exchang-

er tubes, reducing heater efficiency and damaging the

heater. If the pH drops below 7.2, this will cause cor-

rosion of the heat exchanger and severely damage the

heater. Heat exchanger damage resulting from chem-

ical imbalance is not covered by the warranty.

For your health and the protection of your pool equip-

ment, it is essential that your water be chemically

balanced. The following levels must be used as a

guide for balanced water.

Occasional chemical shock dosing of the pool or spa

should not damage the heater providing the water is

balanced.

Automatic chemical dosing devices and salt chlorina-

tors are usually more efficient in heater water, unless

controlled, they can lead to excessive chlorine level

which can damage your heater.

NOTE: Chemical imbalance can cause severe

damage to your heater and associated equipment.

Winterizing Your Heater

Heaters installed outdoors as pool heaters in freezing

climate areas should be shut down for the winter. To

shut down the heater, turn off manual main gas valve

and main gas shut-off. Close isolation valves. Drain

the heater using the hose bibs located on the bottom

of the heat exchanger.

NOTE: There are 2 separate drains on the MVB

that must BOTH be drained to protect the heat

exchanger. These are both accessible by removing

the lower front door from the heater. Drain any

piping of all water that may experience below-

freezing temperatures.

Recommended Level(s)

Fiberglass Pools

Fiberglass Spas

Other Pool and Spa

Types

Water Temperature

68-88°F (20-31°C)

89-104°F (31-40°C)

68-104°F (20-40°C)

7.3-7.4

7.6-7.8

Total Alkalinity (ppm)

120-150

80-120

Calcium Hardness (ppm)

200-300

150-200

200-400

Salt (ppm)

6000 Maximum

Free Chlorine (ppm)*

2-3

Total Dissolved Solids

(ppm)

3000 Maximum

*Free Chlorine MUST NOT EXCEED 5 ppm!

Table H: Water Chemistry

CAUTION: Corrosive water voids all warranties.

CAUTION: Combustion air must not be contami-

nated by corrosive chemical fumes which can

damage the heater and void the warranty.

NOTE: For automatic temperature adjustment, a

Cold Water Run (CWR) system can be used instead

of a manual bypass. See Fig. 10.